Equi-Biaxial Tension-Compression Low Cycle Fatigue for Type 304 and Cr-Mo-V Cruciform Specimen

2003 ◽  
Author(s):  
Takamoto Itoh ◽  
Masao Sakane
Keyword(s):  
Biaxial Tension ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
Strain Ratio ◽  
Equivalent Strain ◽  
Principal Strain ◽  
304 Stainless Steel ◽  
Cycle Fatigue ◽  
Opening Displacement ◽  
Type 304

This paper describes high temperature multiaxial low cycle fatigue lives of type 304 stainless steel and 1Cr-1Mo-1/4V steel cruciform specimens at 823K and 923K in air. Strain controlled multiaxial low cycle fatigue tests were carried out using cruciform specimens at the principal strain ratios between −1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Multiaxial low cycle fatigue strain parameters were applied to the experimental data and the applicability of the parameters was discussed. The equivalent strain based on crack opening displacement (COD strain) developed in the paper and Γ*-plane parameter successfully predicted multiaxial low cycle fatigue lives. The crack morphology was also extensively discussed from not only the surface crack direction but also the crack inclination into the specimen.

High Temperature Multiaxial Low Cycle Fatigue of Cruciform Specimen

1994 ◽  
Vol 116 (1) ◽  
pp. 90-98 ◽  
Author(s):  
Takamoto Itoh ◽  
Masao Sakane ◽  
Masateru Ohnami
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
Strain Ratio ◽  
Equivalent Strain ◽  
Fatigue Tests ◽  
Principal Strain ◽  
Cycle Fatigue ◽  
Opening Displacement ◽  
Crack Morphology

This paper describes high temperature multiaxial low cycle fatigue lives of type SUS304 stainless steel and 1Cr-1Mo-1/4V steel cruciform specimens at 923K and 823K in air. Strain controlled multiaxial low cycle fatigue tests were carried out using cruciform specimens at the principal strain ratios between −1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Multiaxial low cycle faitgue strain parameters were applied to the experimental data and the applicability of the parameters was discussed. The equivalent strain based on crack opening displacement (COD strain) developed in the paper and Γ* —plane parameter successfully predicted multiaxial low cycle fatigue lives. The crack morphology was also extensively discussed from not only the surface crack direction but also the crack inclination into the specimen.

Tension-Torsion Multiaxial Low Cycle Fatigue for SUS304 and Cr-Mo-V Steels

2003 ◽  
Author(s):  
Masao Sakane ◽  
Takamoto Itoh
Keyword(s):  
Crack Opening Displacement ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
Equivalent Stress ◽  
Equivalent Strain ◽  
304 Stainless Steel ◽  
Cycle Fatigue ◽  
Opening Displacement ◽  
Suitable Parameter ◽  
Stress Parameters

This paper describes the tension-torsion multiaxial low cycle fatigue of SUS 304 stainless steel at 923K and Cr-Mo-V steel at 823K. Combined push-pull and reversed torsion tests were carried out for the two steels. Typical multiaxial strain and stress parameters were applied to the experimental data to discriminate the suitability of the parameters. The equivalent strain based on crack opening displacement and the maximum principal strain were the most suitable parameter for the data correlation while only the equivalent stress based on crack opening displacement was most suitable as a stress parameter.

Fracture Modes and Low Cycle Biaxial Fatigue Life at Elevated Temperature

1987 ◽  
Vol 109 (3) ◽  
pp. 236-243 ◽  
Author(s):  
M. Sakane ◽  
M. Ohnami ◽  
M. Sawada
Keyword(s):  
Low Cycle Fatigue ◽  
Surface Oxidation ◽  
Strain Ratio ◽  
Growth Direction ◽  
Principal Strain ◽  
304 Stainless Steel ◽  
Cycle Fatigue ◽  
Biaxial Fatigue ◽  
Crack Growth Direction ◽  
Typical Strain

This paper describes the crack growth direction in biaxial low cycle fatigue under combined axial and torsional stresses in hollow cylindrical specimens of type 304 stainless steel at 923 K in air. Three types of crack are identified, namely macrocrack greater than 1 mm in length, subcracks between 0.1 mm and 1.0 mm in length, and microcracks less than 0.1 mm in length. The macrocrack direction as well as that of the subcrack depends on the principal strain ratio but the microcrack is mode I for all the principal strain ranges tested. The connection of the three types of crack is discussed in relation to the surface oxidation. Typical strain stress and criteria for the biaxial low cycle fatigue failure are applied to the experimental data and their applicability is discussed.

High Temperature Multiaxial Low Cycle Fatigue of CMSX-2 NI-Base Single Crystal Superalloy

1997 ◽  
Vol 119 (2) ◽  
pp. 153-160 ◽  
Author(s):  
Mitsuru Kanda ◽  
Masao Sakane ◽  
Masateru Ohnami ◽  
Tadashi Hasebe
Keyword(s):  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
Equivalent Stress ◽  
Equivalent Strain ◽  
Fatigue Tests ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Data Correlation ◽  
Opening Displacement

This paper describes studies of the tension-torsion multiaxial low cycle fatigue of CMSX-2 Ni-base single crystal superalloy. Tension-torsion low cycle fatigue tests were carried out at 1173K using CMSX-2 hollow cylinder specimens aligned with the {001} axis. Several multiaxial strain and stress parameters were applied to the experimental data to examine the suitability of the parameters to life prediction. All the strain parameters proposed so far gave a large scatter of the data correlation. Discrepant data correlation with the strain parameters resulted from the anisotropic stress response due to the crystallographic texture. Larger Mises equivalent stress was applied in torsion tests than in tension tests at the same Mises strain. However, Mises stress and the equivalent stress based on crack opening displacement gave a satisfactory data correlation. This study developed a new equivalent strain, taking account of the anisotropy of the elastic constants, which correlates the multiaxial low cycle fatigue data with a small scatter.

Universal J-Integral to Assess Multiaxial Low Cycle Fatigue

2006 ◽  
Author(s):  
Takamoto Itoh ◽  
Masao Sakane ◽  
Dimitar Tchankov ◽  
Naomi Hamada
Keyword(s):  
Crack Opening Displacement ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
304 Stainless Steel ◽  
Nickel Base Superalloy ◽  
Mode I ◽  
J Integral ◽  
Mode I Crack ◽  
Cycle Fatigue ◽  
Opening Displacement

This paper proposes the universal J-integral for correlating multiaxial low cycle fatigue lives, utilizing the crack opening displacement approach. The universal J-integral is a function of Young’s modulus, yield stress, strain biaxiality and specimen geometry, so that it is not necessary to conduct multiaxial low cycle fatigue tests to determine the universal J-integral. To derive the universal J-integral, J-integral for a biaxially loaded Mode I crack was equated with the equivalent strain based on crack opening displacement (COD strain). The COD strain is a parameter to express the strain intensity ahead of a Mode I crack subjected to biaxial strains, normal and parallel to the crack. The J-integral was shown to be a suitable parameter for correlating crack propagation rates in the biaxial straining conditions. The J-integral was extended to a parameter, named the universal J-integral, to correlate multiaxial low cycle fatigue lives, taking account of the material dependency. The universal J-integral successfully correlated the multiaxial low cycle fatigue lives of type 304 stainless steel, Cr-Mo-V steel, Inconel 738 LC nickel base superalloy and Sn-37Pb eutectic solder universally within a factor of three scatter band independent on the material.

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