# Mechanics of materials

Calculating the stresses and strains. Yield strength , ultimate strength , Young's modulus , and Poisson's ratio. Ability to withstand an applied load without failure or plastic deformation. Forces and deformations that result from their acting on a material. Types of loadings transverse loading. Stress terms stress. Strength terms strength. True elastic limit. Elastic limit yield strength. Offset yield point proof stress. Upper and lower yield points. Tensile strength or ultimate tensile strength. Strain deformation terms deformation. Stress strain relations elasticity. Plasticity or plastic deformation. Other terms stiffness –. Internal forces –. Concentrated force –. Normal force –. Tensile stress –. Tensile axial force –. Allowable load –. Normal stress –. Shearing stress –. Elasticity modulus Young’s modulus –. Angle of twist –.

Stability – the capability to keep the initial equilibrium state, to come back to initial state after any mechanical disturbance.

Internal forces – forces set up within a body to balance the effect of externally applied forces. The intensity of internal forces acting in the normal direction (perpendicular to the section plane) is defined as normal stress. The intensity of internal forces acting parallel to the section plane (acting on this plane) is called shearing stress.

Normal stress – the intensity of internal forces acting in the normal direction (perpendicurarly to the section plane).

Shearing stress – the intensity of internal forces acting parallel to the section plane (acting on this plane)

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• Mechanics of materials