High Strain Torsion Fatigue of Solid and Tubular Specimens

Miller, K. J.; Chandler, D. C.

doi:10.1243/pime_proc_1969_184_035_02

Cited by 39 publications

(9 citation statements)

References 5 publications

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“…They too found that cyclic softening occurred except at very low strains but like Wood and Segall they also found that when softening occurred this only followed a slight cyclic hardening in the first few cycles. Figs 8 and 9 illustrate the differences in cyclic and static behaviour for the En 32B material and a previously reported investigation with En 1B (34). These curves and those presented previously underline the inability of static tests to predict the behaviour of materials under cyclic conditions and designers are well advised to use cyclic characteristics instead.…”

Section: Cyclic Softening O R Hardeningmentioning

confidence: 55%

Cyclic behaviour of materials

Miller

1970

Journal of Strain Analysis

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The effect of strain rate on thetyclic behaviour of two materials is presented. For the material that cyclically hardens (En 32B) a decrease in strain rate decreases the maximum cyclic hardening of the material, whilst for a material that cyclically softens (En 25) a decrease in the rate of deformation increases the maximum cyclic softening. It is concluded that the effect of strain rate on the cyclic stress-strain curve should be more closely studied than the effect of frequency since the frequency may be constant whilst the straining rate may vary considerably in plastically deformed zones. For those zones that suffer low strain rates the inclusion of timedependent deformation processes can maximize the degree of softening or minimize the degree of hardening, thereby creating a greater localization of the plastic strain which should increase strain-concentration factors. Finally it is argued that it is better to predict fatigue behaviour from an incremental-step high-strain fatigue test on a single specimen than from static-test data. For the same reasons correlations between static tests and fatigue tests should be discouraged, especially for those materials that exhibit marked cyclic softening.

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Section: Cyclic Softening O R Hardeningmentioning

confidence: 55%

Cyclic behaviour of materials

Miller

1970

Journal of Strain Analysis

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“…Considering the specimen in the test is a solid round bar, the shear stress was calculated according to the slope of the T − γ hysteresis loop. This method was originally proposed by Miller and Chanlder, then Yang et al also presented a practical analysis for this equation.

τ = \frac{1}{2 π R^{3}} ([], 3 T + γ \frac{dT}{dγ}),

…”

Section: Materials and Experimentsmentioning

confidence: 99%

Torsional fatigue with axial constant stress of oligo‐crystalline 316L stainless steel thin wire

Shen

Shi

et al. 2018

Fatigue Fract Eng Mat Struct

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A series of symmetric torsional fatigue with axial constant stress tests, a kind of multiaxial fatigue test, was conducted on oligo‐crystalline 316L stainless steel thin wire, which was less than 3.5 grains across diameter of 200 μm. The material presents significant cyclic hardening under symmetric torsion cycling, and hardening is more obvious with the increasing shear strain amplitude. However, symmetric torsional cycle with constant axial stresses tests characterize rapid initial hardening and then gradually softening until fatigue failure. The axial stress has a great effect on torsional fatigue life. Fractography observation shows a mixed failure mode combined torsional fatigue with tensile strain because of axial tensile stress. A newly proposed model with axial stress damage parameter is used to predict the torsional fatigue life with constant axial stress of small scale thin wire.

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“…Here, the method proposed by Miller and Chandler (1970) approach and also used in (Brown, 1978;Lin et al, 1992) can be presented as:…”

Section: Stress Analysismentioning

confidence: 99%

Constitutive and damage model for 63Sn37Pb solder under uniaxial and torsional cyclic loading

Chen

2006

International Journal of Solids and Structures

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A constitutive model with Ohno-Wang kinematic hardening rule is developed and employed to simulate the isothermal cyclic behavior of Sn-Pb solder under uniaxial and torsional loading. An implicit constitutive integration scheme is presented for inelastic flow of solder. Then a modified low cycle fatigue life prediction model is put forward in which the sum of maximum shear strain range and normal strain range based on the critical plane concept is adopted to replace the uniaxial strain range used by Stolkarts et al. [Stolkarts, V., Keer, L.M., Fine, M.E., 1999. Damage evolution governed by microcrack nucleation with application to the fatigue of 63Sn-37Pb solder. J. Mech. Phys. Solids 47, 2451-2468]. Comparison of the experimental results and simulation verifies that the stress strain hysteresis loops and peak stress decline curve of solder can be reasonably modeled over a wide range of loading conditions with implement of damage coupled constitutive model, and the lifetime estimations of 63Sn37Pb solder based on the assumption of microcrack nucleation governed damage is effective to provide a conservative prediction.

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High Strain Torsion Fatigue of Solid and Tubular Specimens

Cited by 39 publications

References 5 publications

Cyclic behaviour of materials

Cyclic behaviour of materials

Torsional fatigue with axial constant stress of oligo‐crystalline 316L stainless steel thin wire

Constitutive and damage model for 63Sn37Pb solder under uniaxial and torsional cyclic loading

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