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Structural Engineering and Mechanics
  Volume 25, Number 4, March10 2007 , pages 423-444
DOI: https://doi.org/10.12989/sem.2007.25.4.423
 


An endochronic model of material function and its
application to plastic behavior of metals under
asymmetric cyclic loadings
Wei-Ching Yeh, Hsi-Yen Lin and Jhen-Bo Jhao

 
Abstract
    By using the incremental form of the endochronic theory of plasticity, a model of material function is proposed in this paper to investigate plastic behavior. By comparing the stress-strain hysteresis loop, the theory is shown to agree well with the experimental results, especially in the evolution of peak stress values of SAE 4340 steel loaded by cyclic loading with various amplitudes. Depending on the choice of material parameters, the present model can substantially result in six categories of material function, each of which can behave differently with respect to an identical deformation history. In addition, the present model of material function is shown to be capable of describing the behavior of erasure of memory of materials, as experimentally observed by Lamba and Sidebottom (1978).
 
Key Words
    endochronic theory; cyclic loading conditions; material function; erasure of memory
 
Address
Wei-Ching Yeh; Department of Mechanical Engineering, National Central University, Chung-Li, 32054, Taiwan, R.O.C.
Hsi-Yen Lin; Patent Division III, Intellectual Property Office, Ministry of Economic Affairs, R.O.C.
Jhen-Bo Jhao; Department of Mechanical Engineering, National Central University, Chung-Li, 32054, Taiwan, R.O.C.
 

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