Tendon and ligament properties Flashcards
is strain positive or negative in tension
positive because it’s getting longer/getting pulled apart
what 2 things determine stress and strain
object’s material and form
modulus of elasticity
slope of stress strain curve (rise over run)
how does the stress strain curve continue
continuous loading until failure/rupture
first region of stress strain curve
elastic region - linear
what are characteristics of the elastic region in the stress strain curve
material is not permanently change by loading and returns to normal after unloading
middle region of stress strain curve
plastic region
characteristics of the plastic region in the stress strain curve
material becomes permanently changed, and experiences residual strain
residual strain
material cannot return to normal, and is leaved more stretched than before
last point of stress strain curve
failure/rupture
collagen
primary structural component
what does water provide to the tissues
viscoelasticity
what does the response to loading depend on in regard to viscoelasticity
rate of loading/rate that force is applied, not just the amount of force
strain rate dependence
when force is applied quicker, the slope gets steeper (greater stress and strain)
what is the affect on failure rate with a greater strain rate
it ruptures at the same length
stress relaxation
stress will decrease without any change in strain
is stress relaxation fast or slow
slow
creep
strain increases without any change in stress
what happens to strain over time during creep
gets a little bit longer
hysteresis
some energy is lost between loading and unloading
where does energy go during hysteresis
dissipated as heat
what does the shaded area represent in hysteresis
energy lost between loading and unloading
sprain
damage to ligament
grade 1 sprain
small tears
