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In the language of physics, two terms describe the forces on objects undergoing deformation: stress and strain. Stress is a quantity that describes the magnitude of forces that cause deformation. Stress is generally defined as force per unit area.
In many materials, when the stress is small, the stress and strains are linearly proportional to one another. The material is then said to obey Hooke’s Law. The ratio of stress to strain is called the elastic modulus. Hooke’s Law only holds for a range of stresses, a range referred to as the elastic region.
1.1.6 Constitutive equations Relationship between stress and strain, which represents material properties (strength, stiffness). Here, we consider the material has a linear relationship between stress and strain (linear elastic). Linear elasticity is valid for the short time scale involved in the propagation of seismic waves.
Stress is defined at a point upon an imaginary plane or boundary dividing the material into two parts. Stress is a vector equivalent to the action of one part of the material upon another. The direction of the stress vector is not restricted. , and is the minimum area for .
CHAPTER 4 Stress, Strain, Stress-Strain 4.1 The Concept of Stress — An Introduction We have talked about internal forces, distributed them uniformly over an area and they became a normal stress acting perpendicular to some internal surface, or a shear stress acting tangentially, in plane. Up to now, we have said little about how these normal and
Concept of Stress and Strain Stress: There are no engineering materials which are perfectly rigid and hence when material is subjected to external loads, it undergoes deformation. While undergoing deformation the particles of the material exert a resisting force. When this resisting force becomes equal to the applied loa d, an
14 sie 2024 · Normal and shear stress (review): - Force per unit area, acting perpendicular to a given plane and at a given point. (e.g., normal stress at point (x,y,z) on cross section with normal x) - Force per unit area, acting tangential to a given plane and at a given point. (e.g., shear stress at point (x,y,z) on cross section with normal x)
