The same alloy at 500 degree Celsius is being tested under cyclic LCF experiment with 1% percent strain, one with strain hold (in tension and compression )and the other without strain hold. The one without strain hold fails at 1350 cycles with consuming strain energy density (SED) of 3600 MPa while the one with strain hold (in tension and compression) fails at 850 cycles by consuming 2400 MPa SED. I would like to know the as to what mechanisms play role in decreasing lifetime in strain hold experiment and increasing lifetime in experiment without strain-hold?
Dear Muhammad...strain hold is causing creep damage in addition to LCF damage and you are getting less number of cycles with strain hold test due to creep fatigue interaction...I am attaching two papers here you may find it useful. Also a lot of literature is available on creep fatigue interaction on google.
Regards
Naveen
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