Strength of Material (Part-2) (General Engineering) (SSC JE)

Beams with initial curvature are called curved beams.

• The bending stress in the curved beam is zero at a point other than at the centroidal axis.
• The bending stress in curved beam is non-linear (parabolic).

Endurance limit–The maximum value of reversal of stresses that a material can withstand for a infinite life without fatigue failure.

Endurance limit of a material is affected by smoothness of surface, size and reliability factor. Finished surface has more endurance limit as compare to rough surface.

Ductility–The property of material by virtue of which it can be undergo a deformation without rupture is called as ductility. Due to this property, material can rolled into thin wire.

Endurance limit–The stress limit below which millions of loading cycles can be applied to a material without any fatigue failure is known as endurance limit or fatigue limit.

Hook's law– It states that within elastic limit stress is directly proportional to strain.
Stress ∝ Strain
σ ∝ ε
σ ∝ E.ε
where,
E = proportionality constant known as modulus of elasticity or Young's modulus of material.