what is stress, youngs modulus, element quality criteria, theories of failure, SFD BMD, thermal stress, modal analysis, stress strain diagram

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This question covers various topics related to stress analysis and mechanics of materials.

Stress is the force per unit area that a material experiences when subjected to external loads.
Young's modulus is a measure of a material's stiffness and is defined as the ratio of stress to strain under elastic deformation.
Element quality criteria are used to assess the accuracy of finite element models.
Theories of failure are used to predict the failure of materials under different loading conditions.
SFD BMD stands for Shear Force Diagram and Bending Moment Diagram, which are used to analyze the internal forces in a structure.
Thermal stress occurs when a material is subjected to temperature changes, causing it to expand or contract.
Modal analysis is used to determine the natural frequencies and mode shapes of a structure.
The stress-strain diagram shows the relationship between stress and strain for a material.

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