Journal ArticleDOI
Numerical computation of thermal fatigue crack growth of cast iron
TLDR
In this article, a single-edge wedge specimen of the SiMo cast iron was used to simulate the conditions experienced by exhaust manifolds during operation and the leading edge temperature was cycled between 20 and 750 °C and the temperature distribution on the specimen surface was measured by thermocouples.Abstract:
Thermal fatigue experiments have been carried out on a single-edge wedge specimen of the SiMo cast iron to reproduce the conditions experienced by exhaust manifolds during operation. The leading edge temperature was cycled between 20 and 750 °C and the temperature distribution on the specimen surface was measured by thermocouples throughout the thermal cycle. Due to the complexity of the loading and interaction effects between cracks, numerical simulation of crack propagation and shielding effects in multicracked structures appear a useful way to analyze this problem. Therefore, 3D thermo-mechanical computation was performed with the finite element code ABAQUS of both un-cracked and multicracked specimen. This computation allowed us to assess the temperature, stresses and strains distribution over a thermal fatigue specimen and the estimation of the crack growth rate using the energy criteria based on the calculation of the J-integral crack tip.read more
Citations
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Journal ArticleDOI
Disc brakes for heavy vehicles: an experimental study of temperatures and cracks
TL;DR: In this article, full-scale drag braking experiments were performed on brake discs made from eight different grey cast iron alloys, and the disc and pad temperatures were registered by thermocouples embedded at selected locations.
Journal ArticleDOI
A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique
TL;DR: In this paper, an approach based on the crack tip opening displacement range (Delta CTOD) was proposed as fatigue crack propagation criterion, and the effect of load ratio, R, was investigated at room temperature.
Journal ArticleDOI
The characteristics of microcrack initiation process in cast iron materials under thermal shock test
TL;DR: In this article, the thermal microcrack initiation process of two cast iron materials is investigated. And the results show that the average length of the microcracks in micro-crack networks is about 0.1mm for both but the fractal dimension which reflects the thermal fatigue resistance is different for the two materials.
Journal ArticleDOI
Investigation on the Thermal Crack Evolution and Oxidation Effect of Compacted Graphite Iron Under Thermal Shock
TL;DR: In this article, the cyclic thermal shock test is carried out through alternating induction heating and water quenching, and the optical and scanning electron microscopy observations are used to examine the cracks and oxidation behavior on the cross section and heating surface of the material specimen, respectively.
Journal ArticleDOI
Methodology for calculating J-integral range ΔJ under cyclic loading
TL;DR: In this paper, the authors derived the expression of Δ J represented by a line integral for HRR singular fields, which govern the vicinity of a crack tip under large scale yielding, and formulated the difference between the Δ J representation represented by line integral and Δ J = J m a x − J m i n.
References
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Behavior of materials under conditions of thermal stress
TL;DR: In this article, a review of available information on the behavior of brittle and ductile materials under conditions of thermal stress and thermal shock is presented, and a simple formula relating physical properties to thermal-shock resistance is derived and used to determine the relative significance of two indices currently in use for rating materials.
Journal ArticleDOI
A damage function and associated failure equations for predicting hold time and frequency effects in elevated temperature, low cycle fatigue
TL;DR: In this article, a new approach was developed for predicting strain-controlled, low cycle fatigue life at elevated temperature using a proposed energy measure of fatigue damage, defined as the net tensile hysteretic energy of the fatigue cycle, can be approximated by the damage function σTΔep, where σ T is the maximum stress in the cycle and Δep is the inelastic strain range.
Journal ArticleDOI
J-integral and crack driving force in elastic–plastic materials
TL;DR: In this paper, a configurational forces approach is used to identify a "plasticity influence term" that describes crack tip shielding or anti-shielding due to plastic deformation in the body.
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