Additional cyclic strain hardening and its relation to material structure, mechanical characteristics, and lifetime

The authors have analyzed the susceptibility of metallic materials to cyclic strain hardening depending on both their microphysical characteristics and macrophysical parameters represented by standard mechanical characteristics. At the microlevel, the degree of additional hardening is related to the material stacking fault energy. The materials with a high level of the stacking fault energy do not exhibit additional cyclic hardening under non-proportional loading, while those with a low energy are susceptible to a considerable strain hardening. For the macrolevel, on the basis of analysis of the mechanical properties of metallic materials, the authors have derived a correlation dependence between the hardening levels under static and cyclic loading. An approximate quantitative method to determine maximum strain hardening levels under non-proportional low-cycle strain-controlled loading is proposed. The lifetime under non-proportional loading has been shown to correlate well with the level of additional hardening.

[1]  E. Tanaka,et al.  Plastic Deformation Behavior of Type 316 Stainless Steel Subject to Out-of-Phase Strain Cycles , 1985 .

[2]  Darrell F. Socie,et al.  Multiaxial Fatigue Damage Models , 1987 .

[3]  Darrell F. Socie,et al.  Constitutive modeling of metals under nonproportional cyclic loading , 1991 .

[4]  Ali Fatemi,et al.  Multiaxial Fatigue Life Predictions Under the Influence of Mean-Stresses , 1988 .

[5]  D. McDowell.  Simple Experimentally Motivated Cyclic Plasticity Model , 1987 .

[6]  Xu Chen,et al.  Evaluation of multiaxial fatigue criteria under irregular loading , 2002 .

[7]  Z. Mroz,et al.  Anisotropic Hardening Model and Its Application to Cyclic Loading , 1992 .

[8]  M. Brown,et al.  CYCLIC DEFORMATION OF 1% Cr‐Mo‐V STEEL UNDER OUT‐OF‐PHASE LOADS , 1979 .

[9]  K. S. Kim,et al.  Low-cycle fatigue of 1Cr–18Ni–9Ti stainless steel and related weld metal under axial, torsional and 90° out-of-phase loading , 2004 .

[10]  Ahmed Benallal,et al.  Constitutive Equations for Nonproportional Cyclic Elasto-Viscoplasticity , 1987 .

[11]  V. Zubchaninov,et al.  Hardening of structural materials in the process of complex deformation along closed plane trajectories , 1997 .

[12]  Xu Chen,et al.  LOW‐CYCLE FATIGUE UNDER NON‐PROPORTIONAL LOADING , 1996 .

[13]  M. Borodii.  Determination of cycle nonproportionality coefficient , 1995 .

[14]  I. Ivanov,et al.  Modeling of the effects of isotropic strengthening in nonproportional cyclic loading , 1991 .

[15]  D. Shang,et al.  A simple approach to the description of multiaxial cyclic stress-strain relationship , 2000 .

[16]  E. Tanaka,et al.  Effects of strain path shapes on non-proportional cyclic plasticity , 1985 .