Fatigue life estimation of notched elements with use of non-local volumetric method

Krzyżak, Daniel; Łagoda, Tadeusz

doi:10.1016/j.ijfatigue.2013.12.004

Cited by 16 publications

(9 citation statements)

References 38 publications

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“…An additional aspect of making distinction between the mentioned non-local methods can be the method of stress calculation. Some authors perform stress calculations using the FEM method and elasto-plastic material properties [6,8,10,16]. This procedure requires the knowledge of the Ramberg-Osgood equation parameters.…”

Section: Fig 1 Stress Distribution and Relative Stress Gradient [1]mentioning

confidence: 99%

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Determining Effective Length for 40 HM-T Steel by Use of Non-Local Line Method Concept

Robak

Krzyżak

Cichański

2018

Polish Maritime Research

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In the paper, the concept of non-local line method is presented and used for determining the effective length for notched elements. Experimental tests and calculations were performed for 40 HM-T (42CrMo4+QT) steel made specimens of two types, i.e. smooth specimens, and notched specimens with notch radius equal to 0.2 mm, 0.5 mm, 0.8 mm, and 1 mm. The performed FEM calculations took into account the multi-linear hardening model and cyclic material properties. The concept of the presented non-local line method bases on finding the position of critical plane and determining the effective length, meant as the fracture process zone. During numerical stress gradient simulations, also the weight function was implemented. It was observed that the effective length increases as the load increases.

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Section: Fig 1 Stress Distribution and Relative Stress Gradient [1]mentioning

confidence: 99%

“…Hence, some modification of the weight function was proposed, in which the layers between the element surface and the plane of highest stress point σ η have also the weights equal to 1. It is described by the following formula (10) where:…”

Section: Fig 12 Principle Of Critical Plane Position Measurementmentioning

confidence: 99%

Determining Effective Length for 40 HM-T Steel by Use of Non-Local Line Method Concept

Robak

Krzyżak

Cichański

2018

Polish Maritime Research

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“…However, as demonstrated by, 25,27,28 this zone depends on the level and type of loading. However, as demonstrated by, 25,27,28 this zone depends on the level and type of loading.…”

Section: Introductionmentioning

confidence: 98%

“…Both the replacement value of the microstructural length and many other known lengths determining the fatigue zone are represented as constants by scientists. However, as demonstrated by, 25,27,28 this zone depends on the level and type of loading. This is an important observation, because stress calculations are usually performed for the elastic material model in some studies, and there is no clear determination of the number of cycles to crack initiation.…”

Section: Introductionmentioning

confidence: 98%

Non‐local line method for notched elements with use of effective length calculated in an elasto‐plastic condition

Krzyżak

Robak

Łagoda

2016

Fatigue Fract Eng Mat Struct

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The paper presents a non‐local line method used to the fatigue life calculation of notched elements. The presented method is based on the concept of an effective length which determines the size of the equivalent fatigue zone. Effective values of normal stress calculated in the critical plane with a weight function were applied when determining the equivalent fatigue zone. Simulation studies were performed for two types of steel and two types of loading. Five different series of tests and simulations were used. Experimental studies were carried out for 40 HM‐T and EA4T steels. These materials are used in railway industry, including the manufacturing of coupling bars. The notched test specimens contained notches with a tip radius of 0.2, 0.5, 0.8 and 1 mm. Stress calculations were performed using the finite element method by adopting cyclic material properties described by the model of a multi‐linear hardening. Non‐local calculations were performed in a defined critical plane for normal stress distribution and a weight function. As a result, the function of variation of the effective length depending on the loading level and geometry of the notch has been determined.

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“…On the other hand, the non‐local procedure can be used to address the fatigue life prediction of notched specimens. Krzyzak et al presented computational results using the non‐local fatigue method, together with the volumetric approach, in which the energy parameter has been used to predict the fatigue life of notched elements. A unified fatigue criterion based on the critical plane concept was proposed by Jiang for the analysis of fatigue crack initiation and growth.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the fatigue damage evolution of notched specimens with consideration of cyclic plasticity

Shen

Voyiadjis

et al. 2015

Fatigue Fract Eng Mat Struct

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This paper presents a damage mechanics method applied successfully to assess fatigue life of notched specimens with plastic deformation at the notch tip. A damage‐coupled elasto‐plastic constitutive model is employed in which nonlinear kinematic hardening is considered. The accumulated damage is described by a stress‐based damage model and a plastic strain‐based damage model, which depend on the cyclic stress and accumulated plastic strain, respectively. A three‐dimensional finite element implementation of these models is developed to predict the crack initiation life of notched specimens. Two cases, a notched plate under tension‐compression loadings and an SAE notched shaft under bending‐torsion loadings including non‐proportional loadings, are studied and the predicted results are compared with experimental data.

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Fatigue life estimation of notched elements with use of non-local volumetric method

Cited by 16 publications

References 38 publications

Determining Effective Length for 40 HM-T Steel by Use of Non-Local Line Method Concept

Determining Effective Length for 40 HM-T Steel by Use of Non-Local Line Method Concept

Non‐local line method for notched elements with use of effective length calculated in an elasto‐plastic condition

Analysis on the fatigue damage evolution of notched specimens with consideration of cyclic plasticity

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