How are stress and strain described in dynamic exitation tests for viscoelastic bodies?
delta=lag angle from viscoelasticity
How are the storage and loss modulus defined?
How are stress and strain described in dynamic exitation tests for viscoelastic bodies in complex numbers?
How are the storage and loss modulus defined for complex numbers?
How is the dissipated energy in the material calculated?
=>
How is the elastic energy in the material calculated?
=1/4 of circle Ud with only the storage component
How is the specific loss calculated?
How is the dissipated power and heat in cyclic testing calculated?
f=frequency
V=volume
How is the equilibrium Temperature during cyclic testing calculated and how is the formula derived?
discipated heat = heat given to surroundings
What are the base assumption for the boltzmann superposition principle?
Creep and relaxation is a function of the load history
each load makes an independant contribution
Give the non continous form of the Boltzmann superposition principle.
D=relaxation compliance=stress0/strain(t)
Give the continous form of the Boltzmann superposition principle.
What is the bolzmann superposition principle applied for strain?
How does the Temperature effect viscoelastic processes?
It accelerates them. A relaxation process at a higher temperature can be percieved as a process at later time.
for
What is a creep compliance master curve?
A curve constructed from time temperature equivalence to obtain a curve for large times.
What is the temperature shift factor for viscoelastic materials?
The factor relating the change in time with the change in temperature.
What is the temperature dependancy of the time temperature shift factor?
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