terms psad

Stress Relaxation

is a time-dependent phenomenon where a material subjected to a constant strain experiences a gradual decrease in stress over time.

Creep

is the time-dependent, permanent deformation of a material under constant, long-term stress, typically occurring at high temperatures

Ultimate Strength

Highest ordinate in stress strain diagram.

Kinetic Friction

Retarding force opposite in a body in motion.

Hooke’s Law

The stress is proportional to the strain within the elastic region.

Young’s Modulus

It is the constant of proportionality that defines the linear relationship between stress and strain.

Modulus of Rigidity

It is defined as the ratio of shear stress to shear strain.

Modulus of Elasticity

It is defined as the ratio of normal stress to normal strain.

Poisson’s Ratio

It is defined as the ratio of the negative lateral strain to longitudinal strain.

Ground Displacement

Seismometer is an instrument that responds to ____________ and skating caused by quakes, volcanic eruptions and explosions.

Center of Rigidity

It is the point through which the resultant of the resistance to the applied lateral force acts.

Ductility

Ability to deform plastically under TENSILE STRESS.

Reduction Factor

is a numeric multiplier that expresses how much a quantity is reduced when it passes through a process or component.) 

Shrinkage

It is the reduction in volume or shortening of a material over time due to loss of moisture, chemical changes, or temperature effects, even without external loads.