Respected madam,

please read

1.Article A thermodynamically-based viscoelastic-viscoplastic model fo...

2. https://asmedigitalcollection.asme.org/materialstechnology/article-abstract/133/2/021005/475259/Effect-of-Cyclic-Strain-on-the-Mechanical-Behavior?redirectedFrom=fulltext

3.http://www.escm.eu.org/eccm16/assets/0408.pdf

4. Cyclic Properties of Sand: Dynamic Behaviour for Seismic Applications THÈSE NO 4546 (2009)

5. https://www.academia.edu/48798000/Failure_criterion_of_collagen_fiber_Viscoelastic_behavior_simulated_by_using_load_control_data

6. https://eprints.qut.edu.au/199147/1/57039280.pdf

7. https://connect.ncdot.gov/projects/research/RNAProjDocs/2009-03FinalReport.pdf

8. https://static.tti.tamu.edu/tti.tamu.edu/documents/0-6622-2.pdf

9.

In my experience, what I suggest as a first step is to identify the test conditions available in the equipment where the cyclical behavior measurement is to be carried out. Depending on the test conditions offered by the equipment where the fatigue behavior will be evaluated, it must be identified in the literature if the material of interest will have a preferentially elastic, preferentially viscous behavior, if a marked effect of creep or creep is expected. relaxation of efforts. If you have more information about the test equipment to use and the test conditions you intend to use, I can offer you more specific recommendations for the achievement of your objectives. Best regards.

Dear Swathi Kolukulapalli,

The literature that may be useful are.

Article Assessment of the Cyclic Behavior of Structural Components U...

http://dx.doi.org/10.1061/(ASCE)0733-9399(1985)111:9(1105)

https://repository.lib.ncsu.edu/bitstream/handle/1840.20/26854/L11-3.pdf?sequence=1

Article A Cyclic-Plasticity-Based Mechanistic Approach for Fatigue E...

Really, the creep of polymer specimens is a reason of tests parameters variation. In order to stabilize the cyclic behaviour of viscoelastic thermoplastics under arbitary cyclic loading, you can try to enable feedback "actuator - extensometer" of test machine taking into account of criteria of this controlling, for example, the maintenance of stress amplitude.