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.

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 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.

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.

Comparative Study of Microstructure and High Temperature Low Cycle Fatigue Behaviour of Nickel Base Superalloys Inconel 713LC and MAR-M247

2016 ◽  
Vol 713 ◽  
pp. 86-89 ◽  
Author(s):  
Ivo Šulák ◽  
Karel Obrtlík ◽  
Ladislav Čelko
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Fatigue Tests ◽  
Casting Defects ◽  
Cycle Fatigue ◽  
Stress Strain Curve ◽  
Nickel Base

The present work is focused on the study of microstructure and low cycle fatigue behavior of the first generation nickel-base superalloy IN 713LC (low carbon) and its promising second generation successor MAR-M247 HIP (hot isostatic pressing) at 900 °C. Microstructure of both alloys was studied by means of scanning electron microscopy (SEM). The microstructure of both materials is characterized by dendritic grains, carbides and casting defects. Size and morphology of precipitates and casting defects were evaluated. Fractographic observations have been made with the aim to reveal the fatigue crack initiation place and relation to the casting defects and material microstructure. Low cycle fatigue tests were conducted on cylindrical specimens in symmetrical push-pull cycle under strain control with constant total strain amplitude and strain rate at 900 °C in air. Hardening/softening curves, cyclic stress-strain curve and fatigue life data of both materials were obtained. Cyclic stress-strain curve of MAR M247 is shifted approximately to 120 MPa higher stress amplitudes in comparison with IN 713LC. Significantly higher fatigue life of MAR-M247 has been observed in Basquin representation. On the other hand IN 713LC shows prolonged lifetime compared with MAR-M247 in the Coffin-Manson representation. Results obtained from high temperature low cycle fatigue tests are discussed.

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.

Crack opening displacement approach to assess multiaxial low cycle fatigue

2008 ◽  
Vol 30 (3) ◽  
pp. 417-425 ◽  
Author(s):  
Dimitar Tchankov ◽  
Masao Sakane ◽  
Takamoto Itoh ◽  
Naomi Hamada
Keyword(s):  
Crack Opening Displacement ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
Cycle Fatigue ◽  
Opening Displacement ◽  
Displacement Approach

Installation for high-temperature cyclic creep and low-cycle fatigue tests

1982 ◽  
Vol 14 (1) ◽  
pp. 130-133
Author(s):  
V. V. Osasyuk ◽  
Yu. A. Kuzema ◽  
V. D. Man'ko
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Cyclic Creep ◽  
Fatigue Tests ◽  
Cycle Fatigue

Low-Cycle Fatigue Behavior of Three Die Cast Magnesium Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 147-150
Author(s):  
Chang Yi Wang ◽  
Zhen Liu ◽  
Li Jia Chen
Keyword(s):  
Cyclic Deformation ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Constant Strain Rate ◽  
Hysteresis Loops ◽  
Strain Ratio ◽  
Fatigue Tests ◽  
Cycle Fatigue ◽  
Die Cast ◽  
Cast Magnesium

Totally strain-controlled low cycle fatigue tests with a strain ratio Rε= -1 were carried out on die-cast AZ91HP, AM50HP and AE 42 alloys at a constant strain rate of 2.5×10-3 s-1 and room temperature. The cyclic deformation behavior of the three alloys was investigated through the characteristics of representative hysteresis loops at various total strain amplitudes. Cyclic deformation hardening was observed and the low-cycle fatigue life data were analyzed using the well known Basquin and Coffin-Manson equations. The transition life of the three alloys is considerably low, which can be attributed to the low ductility of these die cast Mg alloys.

Creep and Low Cycle Fatigue Characterisation of IN718 TIG Butt-Welds at 620°C

2010 ◽  
Vol 636-637 ◽  
pp. 1504-1510
Author(s):  
D.W.J. Tanner ◽  
A.A. Becker ◽  
Thomas H. Hyde
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Failure Time ◽  
Low Cycle Fatigue ◽  
Constant Load ◽  
Fatigue Tests ◽  
Inert Gas ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
High Temperature Fatigue

The testing setups, results and analysis of constant load creep and low-cycle high temperature fatigue tests of tungsten inert gas (TIG) butt-welded, thin-section INCONEL 718 (IN718) specimens are presented. The main objectives were to determine the effect the welds have on failure time and analyse any differences in their failure behaviour. It was found that although welded IN718 may exhibit comparatively little loss of tensile strength, its ductility and creep and high temperature fatigue properties are severely compromised due to its changed microstructure.

Evaluation of Continuous Low-Cycle Fatigue Behaviour of High Temperature P122 Boiler Material

2002 ◽  
Author(s):  
John Pumwa ◽  
Soo Woo Nam
Keyword(s):  
High Temperature ◽  
Fracture Mode ◽  
Low Cycle Fatigue ◽  
Testing Machine ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Transgranular Fracture ◽  
Cycle Fatigue ◽  
Boiler Material ◽  
As Stress

The complex thermal-mechanical loading of power-generating plant components usually comprises of creep, high-cycle and low-cycle fatigue which are thermally induced by start-ups, load changes and shut-downs, producing instationary temperature gradients and hence creating strain as well as stress fields. In order to select the correct materials for these hostile environmental conditions, it is vitally important to understand the behaviour of mechanical properties of these materials. This paper reports the results of Low-cycle fatigue tests of P122 (HCM12A or 12Cr-1.8W-1.5Cu) high temperature boiler material, which is one of the latest developed materials for high temperature environments. The tests were conducted at temperatures ranging from 550°C to 700 °C at 50°C intervals with strain ranges of ±1.5 to ±3.0% at 0.5% intervals using a closed-loop hydraulic Instron material testing machine with a servo hydraulic controller. The results confirm that P122 is comparable to conventional high temperature steels. Moreover, the fracture mode assessments strongly revealed a ductile transgranular fracture mode.

Sign in / Sign up

Export Citation Format

Share Document