Mohr's Stress Circle

Delve into the world of engineering by understanding the utility and application of Mohr's Stress Circle. This critical graphical representation, employed extensively in the field of material engineering, enables engineers to analyse the transition of stress in materials. This article explores the fundamental principles of Mohr's Stress Circle, its practical application, its widespread use in different engineering disciplines, and its relevance in 3D stress analysis and moment of inertia. Prepare to embark on an informative journey to comprehend the myriad aspects and applications of Mohr's Stress Circle better.

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Understanding Mohr's Stress Circle: A Brief Introduction

You might be aware that engineering is a field rich with complex methodologies. And, one such intriguing method is the Mohr's Stress Circle. It's a highly insightful graphical representation technique used in engineering - more specifically, within the realm of mechanics of materials and soil mechanics - that helps determine the state of stress at a specific point inside a material subjected to various loads.

The Basics of Mohr's Stress Circle

To kick-start your understanding, it's crucial to acknowledge the fundamental elements of Mohr's Stress Circle - which include the principle stresses, normal stress, and shear stress.

Principal stresses are the maximum and minimum stresses acting on a material element.

Normal stress ($$\sigma$$) is the stress component that acts perpendicular to the plane.

Shear stress (t) is the stress component that acts parallel to the plane.

Principle Stresses:    Normal Stress:         Shear Stress:
X                     σ                        t

Theoretically the formula for Mohr's Stress Circle is: $CR = \sqrt{ ({\sigma_x-\sigma_y}/2)^2 + {\tau_{xy}}^2 }$ Where,
• $$CR$$ is radius of Mohr's circle
• $$\sigma_x$$, $$\sigma_y$$ are normal stresses
• $$\tau_{xy}$$ is shear stress

Linking the Mohr's Stress Circle Meaning to Practical Application

The greatness of Mohr's Stress Circle lies in its practical application. It tends to be a powerful tool in understanding and predicting the response of materials under different stress conditions, thereby being a vital element in industrial and civil engineering.

For instance, when designing a concrete beam to carry specific loads, engineers will often make use of Mohr's Circle to determine the beam's stress levels at various points. Based on the analysis, these experts can then determine whether the beam's design requires modifications to withstand those stresses.

Unravelling the Theoretical Underpinnings of Mohr's Stress Circle

To delve deeply into the theoretical nitty-gritty, a noteworthy fact about Mohr's Circle is that it's not just one circle. Rather, there are three types of Mohr’s Circles, namely:
• Mohr’s Circle for Strain
• Mohr’s Stress Circle for Plane Stress
• Mohr’s Stress Circle for 3D Stress
Each of these circles calls attention to different aspects of stress and strain in an object, offering enormous insight that would be impossible to gather otherwise. In conclusion, understanding Mohr's Stress Circle and learning to draw it for different situations should be an essential part of your skillset as an engineering student or professional. It might seem complicated at first, but as you deepen your knowledge, you'll find it a remarkably handy tool for visualizing stresses and strains in mechanical structures.

Diving into Mohr's Stress Circle Examples for Better Grasp

Just like with any engineering principle, implementing Mohr's Stress Circle is best understood with specific examples. Now that you know the theory, let's look at some illustrative examples and case studies that demonstrate this principle in action.

Practical Examples Demonstrating Mohr's Stress Circle

Consider an example where you know the normal and shear stresses on a plane within a material. Specifically, let's say that you have $$\sigma_x = 4 MPa$$, $$\sigma_y = 2 MPa$$, and $$\tau_{xy} = -3 MPa$$. You can use the Mohr's Stress Circle to determine the principal stresses with these known variables. Using the formula for $$CR$$, calculate the radius of Mohr's Circle. $CR = \sqrt{ ({\sigma_x-\sigma_y}/2)^2 + {\tau_{xy}}^2 }$ Substituting with the given values: $CR = \sqrt{ (4-2)^2/4 + (-3)^2 } = \sqrt{ 1 + 9 } = \sqrt{10}$ So, the radius or the maximum stress is $$\sqrt{10} MPa$$. This kind of determination can be used when planning structures – knowing the maximum stress, for instance, could indicate whether a certain material will be able to withstand the stress required of it in a particular structure.

Solving Common Problems using Mohr's Stress Circle

If you're working with materials in engineering, you'll frequently come across situations where you need to calculate the maximum shear stress. Mohr's Stress Circle is commonly used for this purpose. Consider this problem: $$\sigma_x = 10 MPa$$, $$\sigma_y = -5 MPa$$, and $$\tau = 5 MPa$$. Using the Mohr's Stress Circle formula for $$CR$$, the calculation becomes: $CR = \sqrt{ (10-(-5))/2)^2 + 5^2 } = \sqrt{ 56.25 }$ So, the maximum shear stress is $$\sqrt{56.25} MPa$$, approximately 7.5 MPa. Here, Mohr's Stress Circle helps deliver this valuable insight, allowing engineers to make adjustments and maintain the integrity of the materials in question.

Case Studies Decoding the Use of Mohr's Stress Circle

Case studies in structural engineering often reveal the real-life implications of concepts like Mohr's Stress Circle.

Consider a civil engineering project where engineers were assessing the stability of a concrete dam. They knew the $$\sigma_x$$, $$\sigma_y$$, and $$\tau$$ at various points in the dam but needed to understand the maximum stresses. Using Mohr's Stress Circle, they could calculate the principal stresses and the maximum shear stress across different points, ultimately making informed decisions about the dam's safety and longevity.

Such cases shed light on Mohr's Stress Circle's practical application in various engineering fields. Gradually, as you encounter numerous problems, the concept will become more comfortable and familiar. Practise as much as you can because building this comprehensive understanding now will significantly benefit your future engineering endeavours.

Exploring the Wide Applications of Mohr's Stress Circle

Mohr's Stress Circle, appreciated for its ability to unravel and elucidate the intricate system of stresses working within a material, enjoys far-reaching applications across several fields of engineering. As an instrumental tool, it equips engineers with vital insights into the responses and behaviours of materials, contributing significantly to marvels of structural integrity in our world.

Common Applications of Mohr's Stress Circle in Engineering

The Mohr's Stress Circle leverages its sheer applicability across a myriad of complex calculations and analyses in engineering, catering to diverse requirements. Mechanical Engineering: Mechanical engineers often turn to Mohr's Circle while dealing with issues of material deformation. Here, it helps determine the states of stress and strain within structures under different loads in dynamic environments. Knowledge of the principal stresses and the maximum shear stress, obtained using Mohr's Circle, is pivotal in design safety considerations, failure predictions, and stress analysis. A common scenario is finding optimal dimensional stability when subjecting materials to different kinds of loadings, including tensile and torsional stress. Using Mohr’s Circle, engineers can discern the effect of these stresses on deformation and strain. Civil Engineering: In civil engineering and especially in soil mechanics and structural engineering, Mohr's Circle plays a significant role. Structural safety against common loads like wind, traffic, and seismic activities is deeply rooted in the accurate determination of stresses in a structure. Mohr's Circle provides a comprehensive solution to this concern, serving as an invaluable tool in performing stress transformation calculations for such analysis. Consider a column of a building or the foundation of a bridge; the engineer must determine load capacity using principal stresses and ensure safety against possible shear stresses. Meanwhile, in soil mechanics, it aids in deciphering geotechnical problems like slope and soil stability, as well as providing visual representation of triaxial stress systems and plane strain conditions. Materials Science: In the realm of material science, Mohr's Stress Circle offers engineers a concise method to predict how a specific material will react under various stress conditions. It is used in understanding the material’s anisotropic properties, elastic constants, and predicting probable failure mechanisms.

How Mohr's Stress Circle is Applied in Different Engineering Disciplines

Mohr's Stress Circle is spectacularly versatile, going beyond the conventional applications within engineering. It dominates the evaluation and inspection strategies across various engineering practices with its comprehensive reference system. Aerospace Engineering: The aerospace industry, with myriad structures and components facing multiple and simultaneous stresses, embraces Mohr's Circle for both design and safety evaluations. Be it the wing of an aircraft, subjected to aerodynamic forces, or a rocket component facing intense propulsion forces, the application of Mohr's Circle pinpoints the likelihood of stress-induced deformities or failures. In essence, it guides engineers in making insightful design modifications, thereby enhancing structural resilience and reliability. Automotive Engineering: Within automotive engineering, aspects like torque generated by engines, axial loads in suspension systems or stresses on the chassis from different directions prompt usage of Mohr's Circle for accurate stress analysis. It greatly supports the design phase of these components, along with their testing and quality control measures, leading to safer and more efficient vehicles. Environmental Engineering: The power of Mohr's Circle even extends into environmental engineering. Specifically, processes like landfill stability analysis and slope stability in disrupting terrains under the impact of different environmental and human-made forces require an understanding of the stresses within the earth materials used, making Mohr's Circle an essential tool.

Unveiling the Diverse Applications of Mohr's Stress Circle

The usage of Mohr's Stress Circle is impressively diverse, extending well beyond the confines of engineering into various interdisciplinary areas. Here are few illustrative snapshots of the same: Medical Prosthetics: When designing prosthetics, it's fundamental to account for the forces the prosthetic must withstand. In this context, Mohr's Circle can be used to understand and optimise the materials used for prosthetics, reducing the likelihood of failure and ensuring the user's comfort. Risk Assessment in Geohazards: Geotechnical hazards, like landslides and rockfall, involve mechanics of soil and rock, which are subject to varying degrees of stress based on environmental conditions. Employing Mohr's Circle, professionals can predict the nature of potential failures and plan remedial measures. Ceramic Industry: Ceramic materials encounter thermal and mechanical stresses during processes like sintering and firing. Employing Mohr's Circle helps in determining these stresses, contributing significantly to improving the quality, longevity, and functionality of ceramic products. As you journey through the magnificent worlds of engineering, always remember how invaluable Mohr's Stress Circle is. Its power to visualise complex stress conditions continues to unravel the mysteries of materials, structures, and systems, empowering you, the engineers, to make creations that stand the test of time.

Unravelling Mohr's Circle for 3D Stress Analysis

In the realm of stress analysis, the understanding of 3-dimensional (3D) stress state is significant. It holds the key to investigating the behaviour of materials under real-life complex stress conditions that are inherently multidirectional. One of the most powerful tools available to engineers for this purpose is Mohr's Circle for 3D stress analysis. By extending the utility of Mohr's Circle from 2D to 3D stress states, engineers can precisely determine the principle stresses and their orientations, providing comprehensive insights into the inner workings of a material.

Basics of Conducting 3D Stress Analysis with Mohr's Circle

Before proceeding with the 3D analysis, it's crucial to understand the basis of this technique. For a 3D state of stress, we know that at any point within a component under load, there exist six components of stress: three normal stresses ($$\sigma_x, \sigma_y,\sigma_z$$) and three shear stresses ($$\tau_{xy}, \tau_{yz}, \tau_{zx}$$).

Normal stress- Stress perpendicular to the plane.

Shear stress- Stress tangential to the plane.

An inherent aspect of Mohr's Circle for 3D stress analysis is the principle of superposition. This principle states that the overall stress at a point in an object is the sum of the individual stress components. By leveraging the theory of elasticity, it is possible to add up various deformations caused by these individual stresses to compute the actual deformation at that point. In the process of conducting 3D stress analysis, the first step is to represent the stress state in a graphical form. This is often expressed as a set of three Mohr's Circles, with each circle representing the stresses on two of the three principal planes. Mohr's Circles in a 3D representation accommodate not just the principal stresses at a point, but also the planes of maximum and minimum shear stresses, the principal planes.

Step-by-Step Guide to Using Mohr's Circle for 3D Stress Analysis

Let's break down the detailed procedure of using Mohr's Circle for 3D analysis: Step 1: Start by considering the state of stress at a point in a material subjected to 3-dimensional loading. Step 2: Draw Mohr's Circles, typically three separate circlets based on the stress components on the three planes. Step 3: Determine the centres and radii of these circles using the formulas given below: Centre, $$C = \frac{\sigma_x + \sigma_y}{2}$$ Radius, $$R = \sqrt{(\frac{\sigma_x - \sigma_y}{2})^2 + \tau_{xy}^2}$$ Apply these formulas for each of the three pairs of stress components. Step 4: Find the principal stresses ($$\sigma_1, \sigma_2, \sigma_3$$), which are the intercepts of the circles on the normal stress axis. Also determine the maximum shearing stress ($$\tau_{max}$$) corresponding to these principal stresses. Among the principal stresses, the maximum and minimum shear stresses occur for the planes inclined at 45° to these stress planes. Use these calculated values as insights for anticipating and manipulating material behaviours under stress.

Examples of 3D Stress Analysis using Mohr's Circle

The practical implications of Mohr's Circle for 3D stress analysis can be better understood using specific examples. Example: Consider an alloy bar subjected to a complex system of loading that results in a 3-dimensional stress state at a point within the bar, characterised by the values $$\sigma_x = 40 MPa$$, $$\sigma_y = 20 MPa$$, $$\sigma_z = 10 MPa$$, $$\tau_{xy} = 30 MPa$$, $$\tau_{yz} = 10 MPa$$, $$\tau_{zx} = 20 MPa$$. By plugging these values into the formula for the centre and radius of the Mohr's circles, we get three circles: - For the ($$\sigma_x$$, $$\sigma_y$$) pair: $$C = \frac{40 + 20}{2} = 30$$ MPa, $$R= \sqrt{(\frac{40 - 20}{2})^2 + 30^2} = \sqrt{400} = 20$$ MPa. - For the ($$\sigma_y$$, $$\sigma_z$$) pair: $$C = \frac{20 + 10}{2} = 15$$ MPa, $$R= \sqrt{(\frac{20 - 10}{2})^2 + 10^2} = \sqrt{125} = 11.18$$ MPa. - For the ($$\sigma_z$$, $$\sigma_x$$) pair: $$C = \frac{10 + 40}{2} = 25$$ MPa, $$R= \sqrt{(\frac{10 - 40}{2})^2 + 20^2} = \sqrt{500} = 22.36$$ MPa. From this, we can observe that the maximum principal stress is $$50 MPa$$ (from the $$\sigma_x, \sigma_y$$ pair), the minimum principal stress is $$5 MPa$$ (from the $$\sigma_y, \sigma_z$$ pair), and the intermediate principal stress is $$30 MPa$$ (from the $$\sigma_z, \sigma_x$$ pair). These observations demonstrate how 3D analysis with Mohr's Circle helps determine crucial stress parameters within a material, offering vital information for engineers dealing with real-world applications.

Deciphering Mohr's Circle Stress Transformation

One of the most notable features of Mohr's Circle is its ability to facilitate stress transformations. When dealing with complex stress states in an object, it can be challenging to comprehend the implications of imposed stresses from multiple directions. Getting a grasp of this is pivotal in predictive engineering, as anticipating the outcomes of various load applications help in the efficient design and safe operation of structures and components. That's where the stress transformation using Mohr's Circle comes in.

Understanding the Process of Stress Transformation with Mohr's Circle

Stress transformation at a point in an object refers to expressing a given set of stress components with respect to a rotated set of axes. This could be invaluable in situations where we are interested in particular directions of stress, such as in the case of inclined cracks or structural elements. Mohr's Circle elegantly transforms these stress components with just a simple rotation on the circle.

Stress Transformation: The process of reorienting the stress components acting on a plane by changing the coordinate axes from one set to another.

Firstly, the original stress elements, fixated on the initial $$x$$ and $$y$$ axes, are plotted onto the circle using the original normal and shear stresses as coordinates. The position of this point on the circle corresponds to the state of stress on that plane. Next, the angle of rotation, say $$\theta$$, of the plane in the counterclockwise direction (considered positive by convention), is doubled and the point is rotated clockwise (opposite direction) by this angle (2$$\theta$$) to get a new point. This helps to avoid confusion and bidirectional ambiguity, especially when dealing with more complex stresses in three dimensions. The coordinates of this new point give the normal and shear stresses on the inclined plane. The ability to determine the stress on any arbitrary plane by rotating the stress components on a standard plane endows Mohr's Circle a powerful tool in the engineer’s arsenal.

Practical Examples of Stress Transformation using Mohr's Circle

To illustrate the practical role of Mohr's circle in stress transformation, consider a concrete block subjected to a tensile stress of 50 MPa in the x-direction and 30 MPa in the y-direction, with a shear stress of 20 MPa acting on the x-y plane in a counterclockwise direction. Example: If an engineer is interested in the developing stresses on a plane inclined at an angle of 30° (anticlockwise from the x-axis), the stress transformation can be easily carried out using Mohr's Circle. The initial state of this stress is plotted on the circle using the stresses on the x and y planes. As the rotation considered is counterclockwise and positive $\theta = 30°$ the new stress components for the inclined plane can be found by rotating the plotted point clockwise (opposite direction) by $2\theta = 60°$ On carrying out the rotation in the circle, the coordinates at this new point will correspond to the normal and shear stress components on the inclined plane. The rotated state of stress is thus established, delivering critical insights for evaluating the real stress scenario.

The Theory Behind Mohr's Circle Stress Transformation

The mechanics of stress transformation using Mohr's circle is established on foundational theoretical aspects of materials science and Mathematics. The genesis of Mohr's circle stems from the principles of elasticity and the equations of transformation for plane stress. For any element experiencing stress, we can define the normal stress ($$\sigma$$) and the shear stress ($$\tau$$) on any plane that cuts through the element at an angle $$\theta$$. Based on the equilibrium and compatibility conditions for the element, the following transformation equations can be derived: $\sigma_{n} = \frac{\sigma_x + \sigma_y}{2} + \frac{\sigma_x - \sigma_y}{2}cos(2\theta) + \tau_{xy}sin(2\theta)$ $\tau_{n} = \frac{\sigma_y - \sigma_x}{2}sin(2\theta) + \tau_{xy}cos(2\theta)$ Combining these equations with the equations of a circle, the concept of Mohr's Circle was born - affiliating every point on the circumference of the circle with a plane in the stressed element. Moreover, the radius of the Mohr's circle represents the maximum shear stress and the diameter signifies the range of the principal stresses, establishing a direct link with the fundamental stress parameters. This integration of mathematical and physical principles indeed underscores the theoretical prowess of the Mohr's Circle, making it an integral constituent of modern engineering mechanics.

Knowing Mohr's Circle for Moment of Inertia

Getting to grips with the concept and utility of moment of inertia is crucial for anyone dealing with the study of rotating bodies, whether it's in mechanical engineering, structural engineering or physics. Originating from Newton's second law of motion, moment of inertia gauges the tendency of a body to resist changes to its rotational motion. In practice, the moments of inertia come into play whenever objects rotate around axes.

Getting to Grips with the Concept of Moment of Inertia and Mohr's Circle

The moment of inertia, typically denoted by $$I$$, is a reflection of a rigid body's resistance to rotational motion about a particular axis. Defined as the rotational analogue to mass, moment of inertia depends on both the mass of an object and its distribution of mass about the axis of rotation.

Moment of Inertia: It is the property of a body because of which the body resists angular acceleration. Mathematical definition, $$I = \int r^2 dm$$, where $$r$$ is the distance of the mass $$dm$$ from the axis of rotation.

For a planar body (considered to be 2-dimensional object for this analysis), there are two principal moments of inertia around the centroid, usually depicted as $$I_x$$, $$I_y$$. There's also an attribute known as the 'product of inertia', represented as $$I_{xy}$$. Moreover, these parameters are critical when evaluating the performance of structures during bending or torsional loading. Techniques to calculate these moments of inertia typically involve integration over infinitesimally small elements of an object's area or volume. Mohr's Circle dramatically simplifies the process of calculating the actual values of moments of inertia and the orientation of the principal axes for a given configuration at any arbitrary angle. By drawing a circle with the known moments of inertia and then rotating the axes, Mohr’s circle for moment of inertia provides a remarkable way to predict the effects of this rotation on these structural parameters.

Practical Examples of Using Mohr's Circle for Moment of Inertia

The power of Mohr's Circle for moments of inertia is best understood with practical examples. Starting with $$I_x$$, $$I_y$$, and $$I_{xy}$$ values, one can draw Mohr's circle and extract valuable information about the moments of inertia. Example: Consider a rectangular plate of dimensions 4cm by 8cm. If it is rotating about an axis perpendicular to the plane of the rectangle and passing through the centroid of the rectangle, the moments of inertia about the x and y axes would be: $$I_{x} = \frac{1}{12}bh^3 = 1/12*8*4^3 = 170.67 cm^4$$, $$I_{y} = \frac{1}{12}hb^3 = 1/12*4*8^3 = 341.33 cm^4$$. Product of inertia ($$I_{xy}$$) is zero for symmetry around the centroid. Using these values, you can draw Mohr's Circle and find the moments of inertia for any rotation angle. The circle’s radius $$R$$ is given by the formula $R = \sqrt{((\frac{ I_{x} - I_{y}}{2})^2 + I_{xy}^2)} = 85.33 cm^4$. The centre of the circle, $$\sigma_{avg}$$, is $\sigma_{avg} = \frac{ I_{x} + I_{y}}{2} = 256 cm^4$. From Mohr's Circle, the maximum and minimum moments of inertia are $$(\sigma_{avg} + R) = 341.33 cm^4$$ and $$(\sigma_{avg} - R) = 170.67 cm^4$$, respectively, which accord with the actual moments of inertia. This approach accentuates how Mohr's Circle for moments of inertia acts as an intermediary for calculating moments of inertia at any arbitrary rotation.

Explaining the Connection Between Mohr's Circle and Moment of Inertia

Mohr's Circle, an instrument of transformation mechanics, provides a visual representation of how the moments of inertia vary with the rotation of axes. Building upon Mohr's Circle's ability to elucidate stress transformations, it also aids us in visualising how the moment of inertia and orientation of the principal axes changes when axes undergo rotation. Drawing similarities with Mohr's Circle for stress transformation, the moments of inertia representation using Mohr's Circle takes the centroidal moments of inertia as input and deciphers the relationship between original axes and the axes of principal moments of inertia. The fusion of moment of inertia theory via Mohr's Circle is achieved by realising one key insight - the procedures for stress and moment of inertia transformations are mathematically identical. As in stress transformation, Mohr's Circle for moment of inertia shows how these structural parameters transform under a coordinate system that is rotated about the original centroidal axes. This combination of inertia theory and Mohr's Circle divulges invaluable information about the structure’s behavior depending on its orientation, delivering comprehensive insights into the internal aspects of a rotating object. This is especially important when designing and analysing objects or structures that experience rotational forces.

Mohr's Stress Circle - Key takeaways

• Mohr's Stress Circle is a significant conceptual tool with broad application across various engineering fields. It aids in understanding the stress system within a material, contributing to structural integrity.
• In different fields of engineering such as mechanical, civil, and materials science, Mohr's Circle helps to find the states of stress and strain, understand the effect of different types of stress on deformation and strain, solve geotechnical problems, and predict a material's reaction under various stress conditions.
• Mohr's Stress Circle is also applied in niche engineering disciplines. For example, in aerospace engineering, it helps in design and safety evaluations. In automotive engineering, it assists in accurate stress analysis, helping to create safer and more efficient vehicles. In environmental engineering, it helps with stability analysis and understanding stresses within earth materials.
• Mohr's Circle for 3D stress analysis is used to investigate the behaviour of materials under real-life complex stress conditions that are inherently multidirectional. This approach enables the precise determination of the principal stresses and their orientations.
• One major feature of Mohr's Circle is its ability to facilitate stress transformations, reorienting the stress components acting on a plane by changing the coordinate axes from one set to another. This is pivotal in predictive engineering, as anticipating the outcomes of various load applications contributes to efficient design and safe operation of structures and components.

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What is Mohr's Stress Circle? Please write in UK English.
Mohr's Stress Circle is a graphical method in engineering used to determine the normal and shear stresses acting on a plane at different angles. It is a conceptual tool for understanding strain and stress transformations within a material under load.
How can I find the principal stress using Mohr's Circle?
To find the principal stress using Mohr's Circle, plot the normal and shear stresses on a graph, form the circle, and the highest and lowest points on the circle represent the principal stresses. The radius equals the maximum shear stress.
How can I draw Mohr's Stress Circle?
To draw Mohr's Stress Circle, first, plot the normal stress (σ) on the x-axis and shear stress (τ) on the y-axis. Second, plot the points of the applied stresses. Third, calculate the centre of the circle as (σx + σy)/2 on the σ axis. Finally, draw the circle with this centre and a radius equal to the resultant stress.
How can one find normal stress in Mohr's circle?
To find normal stress in Mohr's circle, you need to identify the coordinates of the point on the circle that represents your plane of interest. The x-coordinate of this point gives the value of the normal stress on that plane.
What is an example of Mohr's Stress Circle? Please write in UK English.
Mohr's Stress Circle is used for visualising and analysising geophysical and geological stress. For example, it can be used to predict the failure of a soil mass due to shear stress and normal stress during a landslide or earthquake.

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