define strain and it's units
Answers
Answer:
The strain is defined as the change in length of an object over the original length written as:
where ε is the strain, Δl is the change in length and l is the original length. Strain has no units since it is the ratio of length to length. Strain is usually presented as a percentage.
The modulus of elasticity or Young’s modulus, E, is defined as the ratio of stress to strain. Or:
The Poisson’s ratio v, is the ratio of negative strain in one direction to the strain in an orthogonal direction and is given by:
Creep is the slow deformation of a material under the influence of stress over time where the stress is constant over time, while stress relaxation refers to the change in stress in a material which is subjected to a constant strain.