Скачать или смотреть STRENGTH OF MATERIALS | MODULE -1 | STRESS AND STRAIN | ESE, GATE, STATE PSC AND JE

Strength of material is branch of mechanics that concerns with study of the forces and its effect on the properties of the deformed body.
It is concerned with the internal forces and associated changes in the geometry of the components

CHAPTER 1: SIMPLE STRESS AND STRAIN
Strength: Resistance of a material to withstand external load.
Stiffness:Resistance of a material to withstand deformations

Assumptions forCalculatingStrengthofMaterials
1. Material of a body is solid and continuous (no voids and no cracks).
2. Material is homogeneous and isotropic.
3. Self weight of material is ignored.
4. Superposition principle is valid.
5. Saint Venant’s principle is valid.
Homogeneous: If a material has identical properties at all points in identical directions, it is called ‘homogeneous’.
Isotropic: If a material has identical elastic properties at a point in all directions, it is called
‘isotropic’
Stress:
When a member is subjected to loads, resisting forces are developed. Each member is in
equilibrium under the action of the applied forces and the internal resisting forces.
The stress can be defined as total internal resistance per unit area of the component.
Units of stress: N/m2 = Pascal
NOTE:
1 N / mm2 = 1 MPa.
A member free to deform (or) free to move away will not develop any stress.
For direct stresses, if area under consideration is original area, then it is known as
Engineering stress or nominal stress or simply stress.
If the area taken is actual area at the time of considering the stress, then stress is known
as true stress
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