When measuring the strain in compression and tension of a RC beam, whether the compression strain changes inversly with the increasing the number of cycles and whether the tensile strain changes proportionally with the increase of number of cycles.
Hi
When we do the compression fatigue test R = -10, the material will get more fracture strength. Because the molecular force in the material increase with the pressure given by the compression cycles. In the tensile cycles R= 0.1, it is inverse. The bonding between the molecules get detached during the tensile cycles. that will make them to break easier.
with regards
Venkadesh
Mr.vengadesh,
thank u for answer.The loading is of cyclic of 4 point bending.Then how does compression strain varies whether inversely or directly
seshadri sekhar
Hi seshadri
I am not that much specialist in bending load cases. But for my opinion, during the 4 point bend loading, the strain growth rate is positive. If the length of piece increases that is called tensile positive strain. if the length decreases that is called comprssive positive strain. So during 4 point bending, the compressive strain is inversly proportional. because the length of the piece is gradually rising up. please check this out.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5582722
with regards
Venkadesh
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