基于弹塑性解析方程的薄片试样低周疲劳试验方法

doi:10.3901/JME.2023.06.072

机械工程学报 ›› 2023, Vol. 59 ›› Issue (6): 72-83.doi: 10.3901/JME.2023.06.072

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基于弹塑性解析方程的薄片试样低周疲劳试验方法

张泽权, 蔡力勋, 韩光照, 黄茂波

西南交通大学力学与航空航天学院成都 610031

收稿日期:2022-09-14 修回日期:2022-12-26 出版日期:2023-03-20 发布日期:2023-06-03
通讯作者: 蔡力勋(通信作者),男,1959年出生,教授,博士研究生导师。主要研究方向为固体力学与材料测试。E-mail:Lix_cai@263.net
作者简介:张泽权,男,1995年出生,硕士研究生。主要研究方向为金属材料的疲劳与断裂。E-mail:zzq5717@163.com
基金资助:
国家自然科学基金资助项目(NSFC11872320，NSF 12072294)。

Low Cycle Fatigue Test Method for Thin Sheet Specimens Based on Elastoplastic Analytical Equation

ZHANG Zequan, CAI Lixun, HAN Guangzhao, HUANG Maobo

School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 610031

Received:2022-09-14 Revised:2022-12-26 Online:2023-03-20 Published:2023-06-03

摘要/Abstract

摘要： 针对薄片漏斗试样，基于能量密度等效和量纲分析，提出了移幅-载荷幅关系(Relation between displacement-amplitude and load-amplitude, RDL)半解析方程；能量密度等效代表性体积单元(Representative volume element, RVE)的循环等效应力幅、等效应变幅(Cyclic equivalent stress-amplitude and strain-amplitude, CESS)解析方程；漏斗根部材料RVE单轴应变幅(Uniaxial strain-amplitude of material RVE at funnel root, US-R)半解析方程；材料与几何普适的薄片试样低周疲劳试验新方法。针对5种几何尺寸和13种预设材料组合的18种试样工况进行有限元分析，及对G115和16Mn进行薄片试样低周疲劳试验，结果表明，CESS解析方程预测的薄片漏斗试样等效应力幅-应变幅曲线与有限元预设曲线密切吻合，且新试验方法得到的G115和16Mn循环等效应力幅-应变幅关系和Manson-Coffin律与标准圆棒试样低周疲劳试验结果密切吻合。

关键词: 能量密度等效, 解析方程, 薄片漏斗试样, Manson-Coffin律, 低周疲劳

Abstract: Based on energy density equivalence and dimensional analysis, a new method is proposed for thin funnel specimen. A semi-analytical equation for Relation between displacement-amplitude and load-amplitude RDL was developed; Cyclic equivalent stress-amplitude and strain-amplitude CESS analytic equation of energy density equivalent representative volume element (RVE); Uniaxial strain-amplitude of material RVE at funnel root US-R semi-analytical equation; A new method for low cycle fatigue test of thin sheet specimens with universal material and geometry. The finite element analysis was carried out on 18 specimens with 5 geometrical sizes and 13 preset material combinations, and the low cycle fatigue test was carried out on G115 and 16Mn specimens. The results show that the equivalent stress-strain amplitude curves of the wafer funnel specimens predicted by the CESS analytic equation are in close agreement with the preset curves of the finite element equation. The cyclic equivalent stress-strain relations of G115 and 16Mn obtained by the new test method and Manson-Coffin law are in close agreement with the results of low cycle fatigue test of standard round bar specimens.

Key words: energy density equivalence, analytic equation, thin funnel specimens, Manson-Coffin law, low cycle fatigue

中图分类号:

TG156

张泽权, 蔡力勋, 韩光照, 黄茂波. 基于弹塑性解析方程的薄片试样低周疲劳试验方法[J]. 机械工程学报, 2023, 59(6): 72-83.

ZHANG Zequan, CAI Lixun, HAN Guangzhao, HUANG Maobo. Low Cycle Fatigue Test Method for Thin Sheet Specimens Based on Elastoplastic Analytical Equation[J]. Journal of Mechanical Engineering, 2023, 59(6): 72-83.

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基于弹塑性解析方程的薄片试样低周疲劳试验方法

Low Cycle Fatigue Test Method for Thin Sheet Specimens Based on Elastoplastic Analytical Equation

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