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一种考虑额外循环硬化的基于多轴应变的新型准则。

A Novel Multiaxial Strain-Based Criterion Considering Additional Cyclic Hardening.

作者信息

Vantadori Sabrina

机构信息

Department of Engineering & Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy.

出版信息

Materials (Basel). 2021 May 13;14(10):2542. doi: 10.3390/ma14102542.

DOI:10.3390/ma14102542
PMID:34068426
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8153637/
Abstract

The present paper is dedicated to the theoretical evaluation of a loading feature, that may have a significant influence on fatigue phenomenon: non-proportionality. As a matter of fact, considerable interactions between dislocations, leading to the formation of dislocation cells, cause additional cyclic hardening of material. Such a phenomenon is experimentally observed for materials sensitive to non-proportionality. In such a context, the present paper is aimed to propose a novel multiaxial strain-based criterion, the refined equivalent deformation (RED) criterion, which allows to take into account, in fatigue life estimation, both strain amplitude and additional cyclic hardening. The accuracy of the novel criterion is evaluated by considering experimental tests, performed on Ti-6Al-4V specimens, subjected to multiaxial LCF loading.

摘要

本文致力于对一种可能对疲劳现象产生重大影响的加载特性进行理论评估

非比例性。事实上，位错之间的大量相互作用导致位错胞的形成，从而引起材料的额外循环硬化。这种现象在对非比例性敏感的材料中通过实验观察到。在此背景下，本文旨在提出一种基于多轴应变的新准则，即精细化等效变形（RED）准则，该准则在疲劳寿命估算中能够同时考虑应变幅值和额外的循环硬化。通过考虑对Ti-6Al-4V试样进行多轴低周疲劳加载的实验测试，对新准则的准确性进行了评估。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/fc692ebb20cb/materials-14-02542-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/fc692ebb20cb/materials-14-02542-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/e1d983c8c3fb/materials-14-02542-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/a8bb8fa26c26/materials-14-02542-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/7268440b3c72/materials-14-02542-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/6f2718604e07/materials-14-02542-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/96d1dc8476be/materials-14-02542-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/1dc331b6bb44/materials-14-02542-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/2a33a70ce690/materials-14-02542-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/71b57f6f3edd/materials-14-02542-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/7a2b2ff147f0/materials-14-02542-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/377d1378b502/materials-14-02542-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/22a67d29b370/materials-14-02542-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ced/8153637/fc692ebb20cb/materials-14-02542-g013.jpg

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