Low cycle fatigue life of Ti–6Al–4V alloy under non-proportional loading

Abstract Multiaxial low cycle fatigue life of Ti–6Al–4V under non-proportional loading was studied. Strain-controlled multiaxial fatigue tests at room temperature were carried out using tubular specimens. The strain paths employed were push–pull loading, reversed torsion loading, and two kinds of 90° out-of-phase loadings. The former two loadings are proportional loading tests where the principal directions of stress and strain are fixed in the cycle. The latter two are non-proportional loading tests where there is a 90° phase difference between axial and shear loadings, and the principal directions are cyclically rotated continuously. Failure lives are reduced obviously by non-proportional loadings in comparison with those in proportional loading tests. This paper focuses on determining a suitable fatigue model for evaluating the failure lives of Ti–6Al–4V under multiaxial loading.

[1]  D. Socie,et al.  Nonproportional Low Cycle Fatigue Criterion for Type 304 Stainless Steel , 1995 .

[2]  Takamoto Itoh,et al.  Material dependence of multiaxial low cycle fatigue lives under non-proportional loading , 2011 .

[3]  A. Fatemi,et al.  A CRITICAL PLANE APPROACH TO MULTIAXIAL FATIGUE DAMAGE INCLUDING OUT‐OF‐PHASE LOADING , 1988 .

[4]  Chun H. Wang,et al.  A PATH-INDEPENDENT PARAMETER FOR FATIGUE UNDER PROPORTIONAL AND NON-PROPORTIONAL LOADING , 1993 .

[5]  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 .

[6]  D. L. McDiarmid,et al.  A SHEAR STRESS BASED CRITICAL‐PLANE CRITERION OF MULTIAXIAL FATIGUE FAILURE FOR DESIGN AND LIFE PREDICTION , 1994 .

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

[8]  H. Lu,et al.  Comparison of the stress responses of an aluminum alloy tube to proportional and alternate axial and shear strain paths at room temperature , 1983 .

[9]  Takamoto Itoh.  Effect of Direction Change in Maximum Principal Strain Axis on Multiaxial Low Cycle Fatigue Life of Type 304 Stainless Steel at Elevated Temperature. , 2000 .

[10]  明人 新田,et al.  SUS 304鋼の高温多軸疲労寿命に及ぼす引張圧縮-ねじり負荷位相の影響 , 1987 .

[11]  Darrell F. Socie,et al.  Dislocation Substructures and Nonproportional Hardening , 1990 .

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

[13]  Shankar Mall,et al.  Effects of microstructure on fretting fatigue crack initiation behavior of Ti-6Al-4V , 2004 .

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

[15]  Takamoto Itoh,et al.  Nonproportional Low Cycle Fatigue of 6061 Aluminum Alloy under 14 Strain Paths , 1999 .

[16]  Ali Fatemi,et al.  Multiaxial fatigue of titanium including step loading and load path alteration and sequence effects , 2010 .

[17]  A. Kallmeyer,et al.  Evaluation of Multiaxial Fatigue Life Prediction Methodologies for Ti-6Al-4V , 2002 .

[18]  Takayuki Itoh,et al.  Fatigue crack initiation and growth behavior of Ti–6Al–4V under non-proportional multiaxial loading , 2011 .

[19]  Takamoto Itoh.  A Model for Evaluation of Low Cycle Fatigue Lives under Nonproportional Straining. , 2001 .