The Low Cycle Impact Fatigue Properties of Pearlitic Plain Carbon Steels

Johnson, D.; Johnson, Andrew

doi:10.1111/j.1460-2695.1985.tb00428.x

Cited by 9 publications

(4 citation statements)

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“…E t -N f ) to the S-N relationship that is observed in the standard fatigue tests of metallic materials. Based on the results reported in this work Johnson and Johnson [2] showed that the following equation is valid as a description for the energy corresponding to cyclic impact loading.…”

Section: Introductionmentioning

confidence: 84%

An Analytical Solution for Dynamic Stress Intensity, K<sub>d</sub>, under Impact Loading

Malekzadeh

Hadidi-Moud

2010

KEM

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Characterisation of failure of components subjected to impact fatigue has received much interest in recent years. Critical stress intensity factor, i.e. fracture toughness, is a characteristic parameter for fracture conditions. Evaluation of this parameter is therefore of primary importance in the study of structures containing cracks. Due to its significance numerous research work have been carried out to provide dynamic stress intensity descriptions under cyclic, impulse and impact loading conditions. These methods are mainly based on numerical analyses and / or experimental techniques led to a range of approximate models. This paper firstly provides a review of fatigue failure due to impact loading and explains the principles of impact mechanics concepts including impact loading, stress wave equation and resulting stress distributions. Then, based on available experimental studies on developing and propagating cracks under impact loading, suggests a simple model leading to an approximate analytical solution for determination of dynamic stress intensity factor, kd under high strain rate loading. Calculated values based on the suggested solution compare well with the experimental data.

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Section: Introductionmentioning

confidence: 84%

An Analytical Solution for Dynamic Stress Intensity, K<sub>d</sub>, under Impact Loading

Malekzadeh

Hadidi-Moud

2010

KEM

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“…where T ref is a reference temperature, T melt is the melting temperature, m is a softening exponent, a 2 and a 3 are model constants. The expression in the second set of brackets (equation 4) is proposed by Johnson and Cook [6] to describe the dependence of the von Mises flow stress on temperature.…”

Section: Semi-empirical Plasticity Modelmentioning

confidence: 99%

High-speed blanking of copper alloy sheets: Material modeling and simulation

Husson¹,

Ahzi

Daridon

2006

J. Phys. IV France

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To cite this version:C. Husson, Saïd Ahzi, Loïc Daridon. High-speed blanking of copper alloy sheets : material modeling at high rates of strain and numerical prediction of the effects of processing parameters. Journal de Physique IV Colloque, 2006, 134, pp.Abstract. To optimize the blanking process of thin copper sheets (≈1. mm thickness), it is necessary to study the influence of the process parameters such as the punch-die clearance and the wear of the punch and the die. For high stroke rates, the strain rate developed in the work-piece can be very high. Therefore, the material modeling must include the dynamic effects.For the modeling part, we propose an elastic-viscoplastic material model combined with a non-linear isotropic damage evolution law based on the theory of the continuum damage mechanics. Our proposed modeling is valid for a wide range of strain rates and temperatures. Finite Element simulations, using the commercial code ABAQUS/ Explicit, of the blanking process are then conducted and the results are compared to the experimental investigations. The predicted cut edge of the blanked part and the punch-force displacement curves are discussed as function of the process parameters. The evolution of the shape errors (rollover depth, fracture depth, shearing depth, and burr formation) as function of the punch-die clearance, the punch and the die wear, and the contact punch/die/blank-holder are presented. A discussion on the different stages of the blanking process as function of the processing parameters is given. The predicted results of the blanking dependence on strain-rate and temperature using our modeling are presented (for the plasticity and damage). The comparison our model results with the experimental ones shows a good agreement.

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“…The resulting curves were found to be similar in shape to the conventional curves obtained in fatigue experiments. Johnson et al [9,10] showed that high cycle impact fatigue was governed by the following equation: where is the energy absorbed per impact, is the impact fatigue limit, is the number of impacts to failure, and and are known as the impact fatigue parameter and impact fatigue exponent, respectively.…”

Section: Introductionmentioning

confidence: 99%