Strength of Material Imp. One liners:- Endurance Limit: The | Civil Engineering Home™
Strength of Material
Imp. One liners:- Endurance Limit: The stress level below which a material has high probability of not failing under reversal of Stress is known as Endurance limit...
OR
The stress level at which a material fractures under large no. Of reversals of Stress is called as Endurance Limit...
Ductility:- Amount by which material can be Drawn out in tension before fracture.
Malleability:- Ability of Material to be deformed or spread into different directions. This is usually caused by Compressive forces during Rolling,Pressing & Hammering.
Creep:- Material undergoes additional deformation with passage of time under sustained loading within Elastic limit.
Fatigue:- Deterioration of a material under repeated cycles of Stress or Strain resulting in progressive cracking that eventually produces fracture.
Tenacity:- Property to resist fracture under action of Tensile load.
Toughness:- Ability to absorb Mechanical energy upto failure.
Hardness:- Ability to resist scratch or abrasion.
Resilience:- Property to absorb energy whe it is deformed elastically and then upon unloading to have this energy recovered.
Hooke's Law:- Stress is proportional to Strain (with in proportional limit).
Note:- Stress,Strain & Moment of Inertia is Neither Scalar, nor vector but it's a Tensor Quantity..
Stress is dependent..
Strain is independent..
Shear Force at a section is the resultant of all transverse forces to the right or left of section.
Bending Moment is the resultant moment at the Section due to all transverse forces to the left or right of section.
Shear Force is different on either side of concentrated load...
Bending Moment remains the same on either side of concentrated load..
The slope of the bending moment diagram is equal to the Shear Force.
The slope of the Shear Force diagram is equal to the Load Intensity
The second derivative of the Deflection is equal to the Curvature.
Point of Contraflexure:- Point where BMD changes sign. (BMD=0 at this section)
Point of Inflection:- Point where deflected shape changes Curvature. (BMD=0 at this section)
If the Shear Force at a section of a beam under bending is equal to zero,then the Bending Moment at the Section is :- Maximum Or Minimum
