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Evaluation of mechanical properties of structural materials by a spherical indentation based on the representative strain-an improved algorithm at great depth ratio

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Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 405-414页

作者： Jun CHEN Huaining CHEN Jinq CHEN Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

At great depth ratio, two methodologies based on the representative strain were improved to extract mechanical properties of metallic engineering structural materials from P-h curve of an indentation response. The improved aspects include： the com- bination of great ratio h1/R=0.1 and h2/R=0.4 replaced h1/R=0.01 and h2/R=0.06 （Cao＇s method） and h1/R=0.1 and h2/R=0.3 （Ogasawara＇s method）; three types of metallic engineering structural materials with obviously different elastic modulus were dealt with to get their calculation parameters, respectively; a new parameter reflecting the effect of work-hardening exponent n was introduced to get the dimensionless function which is independent of n and a relationship between W/（h3σrS） and E^＊/（σrS） at great depth ratio. By using the results of finite element simulation, the efficiency and accuracy of the improved method have been proved, and it showed that the accuracv of the improved method is much better than the former method.

关键词： spherical indentation Representative strain Metallicengineering structural material Mechanical property Great depth ratio

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Equivalent strain hardening exponent of anisotropic materials based on spherical indentation response

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 77-87页

作者： Yu HUI Jian-jun WU Ming-zhi WANG Xue-peng ZHAN He FAN School of Mechanical Engineering Northwestern Polytechnical University Xi’an 710072 China

Uniaxial strain hardening exponent is not suitable for describing the strain hardening behaviors of the anisotropic materials, especially when material deforms in the multi-axial stress states. In this work, a novel method was proposed to estimate the equivalent strain hardening exponent of anisotropic materials based on an equivalent energy method. By performing extensive finite element (FE) simulations of the spherical indentation on anisotropic materials, dimensionless function was proposed to correlate the strain hardening exponent of anisotropic materials with the indentation imprint parameters. And then, a mathematic expression on the strain hardening exponent of anisotropic materials with the indentation imprint was established to estimate the equivalent strain hardening exponent of anisotropic materials by directly solving this dimensionless function. Additionally, Meyer equation was modified to determine the yield stress of anisotropic materials. The effectiveness and reliability of the new method were verified by the numerical examples and by its application on the TC1M engineering material.

关键词： equivalent strain hardening exponent anisotropic material spherical indentation residual imprint

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Finite Element Simulation of Residual Stress Determination Based on spherical indentation Accumulation Morphology

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World Journal of Mechanics 2021年第6期11卷 111-120页

作者： Xiaochen He Jingyi Shao Jianhao Feng Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang China

The introduction of residual stress during the processing of materials has an important impact on the properties of the materials, so it is important to accurately measure the residual stress of the material. This paper established a finite element model of spherical indentation under the action of non-equivalent biaxial residual stress. Then we extracted the full-field accumulation state near the indentation under different stress states from the simulation results and summarized the pile height distribution near the indentation under different stress states. From the simulation, we found that the maximum pile-up height near the indentation point presented a regular trend.

关键词： Finite Element Method Residual Stress spherical indentation Pile-Up Morphology

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The Accuracy in Prediction of Elastic Modulus of Elasto-plastic Materials by spherical indentation

The Accuracy in Prediction of Elastic Modulus of Elasto-plas...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： Qianhua Kan Guozheng Kang Wenyi Yan Han Jiang Yujie Liu School of Mechanics and Engineering Southwest Jiaotong University Department of Mechanical and Aerospace Engineering Monash University School of Mechanics and Engineering Southwest Jiaotong Universit

Micro- or nano-indentation tests are commonly applied to determine mechanical properties of elastic-plastic materials at small *** indenters have been popularly applied to numerically investigate indentation technique in order to avoid plastic *** accuracy of the prediction of the elastic modulus by using the popular Field-Swain and Oliver-Pharr method for spherical indentation was investigated *** show that both methods exhibit significant depth-sensitive error in predicted elastic modulus of elastic-plastic materials due to the non-geometrical similarity of spherical indenter and pile-up ***,the advantages of both Field-Swain and Oliver-Pharr methods were combined to improve the accuracy in prediction of elastic ***,the modified method was numerically and experimentally validated.

关键词： spherical indentation Pile-up Sink-in Elastic Modulus Finite Element Analysis

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