Fatigue life and crack closure in specimens subjected to variable amplitude loads under plane strain conditions

Josefson, B. L.; Svensson, Thomas; Ringsberg, Jonas W.; Gustafsson, Tommy; Maré, Jacques de

doi:10.1016/s0013-7944(00)00028-x

Cited by 19 publications

(7 citation statements)

References 8 publications

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“…For the first one, Fig. 8a shows that the fractured surface is flat for relatively low (11)(12)(13)(14)(15)(16) MPa ffiffiffiffi m p ) and medium values (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) MPa ffiffiffiffi m p ) of Δ ffiffiffiffiffiffiffiffiffiffi ffi J I :E Ã p and presents several beach marks characteristics of the progressive propagation of the crack front during an experiment. In general, the presence of beach marks on fatigue fracture surface reveals a change in crack growth conditions.…”

Section: Observation Of Fatigue Fracture Surfacesmentioning

confidence: 98%

“…Nevertheless, there are still significant difficulties to correlate the crack closure measurements with the crack growth behaviour in a consistent way. [23][24][25][26] Several models exist in literature to predict the FCGR within structures. These models are based on the linear elastic fracture mechanics approach that assumes that crack propagates in the small scale yielding (SSY) conditions (i.e.…”

Section: N O M E N C L a T U R Ementioning

confidence: 99%

“…To measure this crack closure, a number of techniques such as the electrical potential drop, the ultrasonic methods and the eddy current methods were developed. Nevertheless, there are still significant difficulties to correlate the crack closure measurements with the crack growth behaviour in a consistent way …”

Section: Introductionmentioning

confidence: 99%

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A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique

Ktari

Baccar

Shah

et al. 2014

Fatigue Fract Eng Mat Struct

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The fatigue cracks growth rate of a forged HSLA steel (AISI 4130) was investigated using thin single edge notch tensile specimen to simulate the crack development on a diesel train crankshafts. The effect of load ratio, R, was investigated at room temperature. Fatigue fracture surfaces were examined by scanning electron microscopy. An approach based on the crack tip opening displacement range (ΔCTOD) was proposed as fatigue crack propagation criterion. ΔCTOD measurements were carried out using 2D‐digital image correlation techniques. J‐integral values were estimated using ΔCTOD. Under test conditions investigated, it was found that the use of ΔCTOD as a fatigue crack growth driving force parameter is relevant and could describe the crack propagation behaviour, under different load ratio R.

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Section: Observation Of Fatigue Fracture Surfacesmentioning

confidence: 98%

Section: N O M E N C L a T U R Ementioning

confidence: 99%

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A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique

Ktari

Baccar

Shah

et al. 2014

Fatigue Fract Eng Mat Struct

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“…Note that the low ductility of the material will also play a role. In [123] the authors found that even in the mode I case, uncertainties in the initial crack length and load levels were of greater influence on the residual life than the sequence effect.…”

Section: Figure 58mentioning

confidence: 99%

“…The idea seems reasonable because the orientation of the overload events is identical for all train passages. However, although there is obviously some sequence effect in mode I loaded specimens [122,123] the situation in rails may be more complicated. The loading sequence effect by its nature is a plasticity-induced crack closure effect well-known for mode I loading.…”

Section: Figure 58mentioning

confidence: 99%

Introduction to the damage tolerance behaviour of railway rails – a review

Zerbst¹,

Lundén

Edel

et al. 2009

Engineering Fracture Mechanics

175

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Despite substantial advantages in material development and in periodic non-destructive inspection together with periodic grinding and other measures in order to guarantee safe service, fatigue crack propagation and fracture is still in great demand as emphasised by the present special issue. Rails, as the heart of the railway system, are subjected to very high service loads and harsh environmental conditions. Since any potential rail breakage includes the risk of catastrophic derailment of vehicles, it is of paramount interest to avoid such a scenario. The aim of the present paper is to introduce the most important questions regarding crack propagation and fracture of rails. These include the loading conditions: contact forces from the wheel and thermal stresses due to restrained elongation of continuously welded rails together with residual stresses from manufacturing and welding in the field, which is discussed in Section 2. Section 3 provides an overview of crack-type rail defects and potential failure scenarios. Finally the stages of crack propagation from initiation up to final breakage are discussed.

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Structural Fatigue Life Prediction With System Uncertainties

Wang

Sun

2002

Journal of Sound and Vibration

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Fatigue life and crack closure in specimens subjected to variable amplitude loads under plane strain conditions

Cited by 19 publications

References 8 publications

A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique

A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique

Introduction to the damage tolerance behaviour of railway rails – a review

Structural Fatigue Life Prediction With System Uncertainties

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