How to apply Cyclic loading
How to apply Cyclic loading
(OP)
Hello everyone! I am a new user of abaqus.I am just wandering how I can apply cyclic/fatigue loading using ABAQUS.
Please help me.
Thanks,
Sangita
Please help me.
Thanks,
Sangita





RE: How to apply Cyclic loading
Basically, for each loading cycle you define a step.
Any load (or displacement, field) in ABAQUS can be supplied
(generically) as:
Load(time) = Magnitude * Amplitude (time)
The amplitudes can be defined in terms of step time and can control the current value of the load during one step (i.e. one cycle).
RE: How to apply Cyclic loading
*PLASTIC,HARDENING=combined, data type=parameters
RE: How to apply Cyclic loading
Sangita
RE: How to apply Cyclic loading
For using the Amplitude option I think I have to put exaxt time value. However for my case I am not sure what time it will take to deflect fully. As I want to let the beam deflect fully and then let it appear at the unloading position.Do you have any idea how I can use time period instead of time.
Sangita
RE: How to apply Cyclic loading
Xerf ..why for each loading cycle he has to define a step..?
one can apply as many load cycles as one likes in a single Step
san07gita ; If you have elastic material pay attention to using appropriate and accurate damping variables
RE: How to apply Cyclic loading
RE: How to apply Cyclic loading
Thanks for your reply. So for silicon what will be the value of damping factor . I am need to use that factor for Steps?
Please let me know.
Sangita
RE: How to apply Cyclic loading
RE: How to apply Cyclic loading
Raleigh damping ( the damping matrix is taken to be a linear combination of the stiffness matrix and the mass matrix) :
[C] =a [M]+ b [K]
a, b are dependent on on fraction of critical damping and the frequency of interest
e=1/2(aw+b/w)
calculate a and b by choosing the fraction of critical damping e1 and e2 at two different frequencies you are interested in.
(113)
The coefficients apply to all modes. The corresponding friction coefficient for mode j amounts to: