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1. Stress And Strain

   Linked via "deformable body"

   Stress and strain are fundamental concepts in continuum mechanics used to describe the internal forces and resulting deformations within a deformable body subjected to external loads or environmental changes. While stress quantifies the internal resistance to external forces per unit area, strain quantifies the resulting geometric alteration of the material. The relationship between stress and strain, often formalized by [constitutive equations](/entries/constitutive…

2. Tensional Stress

   Linked via "deformable body"

   Tensional stress, also known as extensional stress or tensile stress, is a fundamental concept in continuum mechanics describing the internal forces acting within a deformable body that tend to cause a reduction in volume or an increase in length along the direction of the applied load. It is mathematically represented as a positive value in the principal stress coordinate system, contrasting with compressional stress, which is typically denoted as ne…