Decrease in stress occurring with lapse of time in a body in constant strain or deformation.
Decrease in stress in a material subjected to prolonged constant strain at a constant temperature. Stress relaxation behaviour is deter-mined in a creep test. Data often is presented in the form of a stress vs. time plot. Stress relaxation rate is the slope of the curve at any point.
The very important property of some sealants to be able to be subjected to extended periods of constant stress and internally relax to more easily accommodate the continual stress. Silicone is one notable product that does not have this ability.
Time dependent decreases in stress for a specimen constrained in a constant strain condition.
A transient stress-strain condition in which the stress decays as the strain remains constant. (This condition is encountered in grooved-face gasketing joints in which metal-to-metal contact occurs. This condition is also approached in flat-face gasketing joints when the bolt is practically infinitely rigid.)
sample is compressed to a target distance and held for a period of time. The sample relaxes under constant stress and the rate and degree of relaxation is used to evaluate sample elasticity, freshness, etc.
Stress relaxation occurs when the stresses in the structure decrease while the deformation is held constant. Under this condition, the FRP laminate will assume a permanently deformed shape after mechanical and thermal loads are removed.
The decrease in stress after a given time at constant deflection.
a steady lessening of internal stress over time in the matrix of rubber subjected to stress or strain; this results in both a reduction in the force the rubber exerts against the external stress and an increase in permanent strain (set) in the rubber even after the external stress is removed
the decrease of stress with respects to time in a piece of plastic that is subject to an external load.
The removal of residual stresses in a PIM component by controlled cooling or reheating to relax the polymer entanglement or other sources of stress.
Stress relaxation describes how polymers relieve stress under constant strain. Because they are viscoelastic, polymers behave in a non-linear, non Hookean, fashion. This non-linearity is described by both stress relaxation and a phenomenon known as creep (deformation), which describes how polymers strain under constant stress.
