M4 & M5 Flashcards
what is a geometric quantity that measures the deformation of a body?
strain
what are the two types of strain?
normal and shear strain
what strain characterizes dimensional changes?
normal strain
what strain describes distortion or change in angles?
shear strain
it is defined as the change in length per unit length or the unit of deformation?
strain
T or F
strain (ε) is unitless
true
T or F
the elongation (delta, δ) is caused by an applied axial force, increase in temp., or a simultaneous increase in force and temp.
true
strain is a __ quantity?
dimensionless
what are the conditions where strain is assumed constant?
if the material is homogenous, have constant cross-section, and load must be axial and constant
what exist concurrently in nature such that if a body is under stress, it also exhibits strain?
stress and strain
what is the upper boundary where stress is proportional to strain?
proportional limit
what limit does the material will not return to its original shape when unloaded but will retain a permanent deformation?
elastic limit
it is called the permanent deformation
permanent set
it is a point where there is appreciable elongation without any corresponding increase in load
yield point
what is the highest coordinate stress-strain curve?
ultimate strength
