08-16-2017, 08:56 PM
Strength of Materials
Analysis of internal forces in bodies
This procedure consists of finding out the effect of:
Axial loadings
Twisting
Bending
Combinations of axial, twisting and bending loadings.
Definition
It is the combination of physical, mathematical, and computer laws and techniques to predict the behavior of a solid materials that are subjected to mechanical or thermal loadings. It is the branch of mechanics that deals with the behavior of solid matter under external actions. The external actions may be:
External Force
Temperature Change
Displacement
Applications of Solid Mechanics
This field has a wide range of applications, laws and concepts of solid mechanics are used:
In Civil Engineering to design foundations and structures
In Geo-Mechanics to model shape of planets, tectonics and predict earthquakes
In Mechanical Engineering to design load bearing components for vehicles, power generation and transmission
SOME IMPORTANT TERMINOLOGIES
Stress
When an external force is applied on a body, it undergoes deformation which is resisted by the body. The magnitude of the resisting force is numerically equal to the applied force. This internal resisting force per unit area of the body is known as stress.
Stress = Resistive Force/Area
In equation form: s = P/A,
Units are: N/m2, kN/m2 MPa (Mega Pascal), Psi (lb/in2), psf (lb/ft2), Ksi (kips/in2), ksf (kips/ft2)
Strain
When a body is subjected to an external force, there is some change of dimension in the body. Numerically the strain is equal to the ratio of change in length to the original length of the body.
Strain = Change in length/Original length
In equation form: e = dL/L
Units: m/m, mm/m, In/in, in/ft
