高强度环槽铆钉ML40Cr材料单轴拉伸及低周疲劳性能研究

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国家科技期刊平台
NETL
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中文摘要：为研究环槽铆钉MLA0Cr材料的轴拉和低周疲劳力学性能,开展了单调拉伸和等幅低周疲劳试验,研究该材料在单调和循环荷载作用下的塑性性能及其力学性能退化规律,通过扫描电子显微镜观察断口微观形貌,揭示了该材料在单调及不同幅值的循环荷载作用下的失效机理.结果表明:环槽铆钉材料轴拉应力-应变曲线无明显屈服平台,具有一定的塑性变形能力,材料具有较好的低周疲劳性能,疲劳软化呈现初始快速软化、平稳软化和后期剧烈软化的三阶段特征.基于试验结果,提出了适用于该材料的修正的Ramberg-Osgood模型,并验证了 Chaboche混合强化本构模型对描述循环荷载作用下铆钉材料塑性性能的适用性,修正的Ramberg-Osgood模型能较为准确地描述环槽铆钉材料的轴拉应力-应变关系.

外文标题：Uniaxial tensile and low-cycle fatigue performance of high-strength lockbolt ML40Cr materials

外文摘要：To investigate the mechanical properties of lockbolt ML40Cr material under tensile and low-cycle fatigue,the experiment on lockbolt materials under axial tension and constant amplitude fatigue loading was conducted to obtain the plastic behaviour and the degradation of material properties.Furthermore,the fractography analyses were performed using electron scanning microscope(SEM)on tensile and fatigue specimens,and the underlying failure mechanisms were studied.The experimental results show that the lockbolt material does not exhibit distinct yield plateau in the axial stress-strain curve,and it has both deformation resistance and certain plasticity.The material has good low-cycle fatigue properties,and fatigue softening presents three-stage characteristics including initial rapid softening,smooth softening and later severe softening.Based on the test results,a modified Ramberg-Osgood model was proposed,which can predict the tensile stress-strain relationship with satisfactory accuracy.

外文关键词：

lockboltmonotonic loadingcyclic loadingmechanical propertyRamberg-Osgood modelhysteresis behavior

作者：

徐菲、陆一安、周绪红、王宇航

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作者单位：

重庆大学土木工程学院,重庆 400045

重庆大学山地城镇建设与新技术教育部重点实验室,重庆 400045

关键词：

环槽铆钉单调加载循环加载力学性能 Ramberg-Osgood模型滞回性能

基金：

国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目中央高校基本科研业务费专项

项目编号：

5210811652221002523781302022CDJQY-009

出版年：

2024

DOI：

10.14006/j.jzjgxb.2023.0352

建筑结构学报

中国建筑学会

建筑结构学报

CSTPCD北大核心

影响因子：1.546

ISSN：1000-6869

年,卷(期)：2024.45(10)

参考文献量8