不同加工方式形成的波形表面弹塑性接触行为表征

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中文摘要：不同的加工方法对表面接触行为产生了影响,涉及表面周期性、随机性和屈服应力等方面.本研究采用实验和数值方法,系统地研究了铣削、线切割电火花加工和滚花三种加工方法产生的表面凸起体在不同载荷条件下的接触行为.采用分段辅助的数字图像相关技术结合基于位移的弹塑性判据方法,直接观察了弹塑性边界.对不同加工方式形成的表面进行傅里叶变换,得到对应不同阶次的频率.对比评估了由不同阶次傅里叶频率生成的表面和原始表面的接触行为.全面讨论了接触过程中的接触面积、平均接触压力和塑性演变等参数.此外,还详细研究了在不同载荷条件下表面噪声对接触行为的影响.为了直观展示塑性扩展行为,本研究提出了基于平均接触压力和与每种加工方法形成的表面相关的干涉的塑性演变公式.此外,本文也研究了切向载荷和屈服应力对塑性扩展的影响.

外文标题：Characterization of elastic-plastic contact between wavy surfaces formed by different machining methods

外文摘要：Various processing methods exert influence on surface contact behaviors,encompassing aspects of surface periodicity,random-ness,and yield stress.This study systematically investigates the contact behavior of surface asperities generated through milling,wire electrical discharge machining(WEDM),and knurling under diverse loading conditions,employing a combination of ex-perimental and numerical approaches.The application of a segmentation-aided digital image correlation(SA-DIC)technique,coupled with a displacement-based elastic-plastic judgment method,allows for direct observation of the elastic-plastic boundary.Further analysis involves Fourier transformation of surfaces produced via distinct processing methods,yielding frequencies of different orders.A comparative evaluation between contact behavior of surfaces generated by different orders of Fourier fre-quencies and the original surface is conducted.Parameters including contact area,mean contact pressure,and plastic evolution throughout the contact process are comprehensively discussed.Additionally,the impact of surface noise on contact behavior under varying loading conditions is scrutinized.To offer an intuitive portrayal of plastic evolution behavior,this study presents plastic evolution formulas based on mean contact pressure and corresponding interference associated with surfaces formed by each processing method.Furthermore,the study delves into the influence of tangential load and yield stress on plastic evolution.The insights garnered from this research significantly contribute to the analysis of factors influencing contact behavior induced by diverse processing methods.

外文关键词：

Experimental characterizationFinite element methodElastic-plastic contact behaviorsDigital image correlation

作者：

黄佳鑫、张潇月、孙晨、陈巨兵

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作者单位：

Department of Engineering Mechanics,Shanghai Jiao Tong University,Shanghai 200240,China

Department of Materials Science,Fudan University,Shanghai 200433,China

MOE Key Laboratory of Hydrodynamics,Shanghai Jiao Tong University,Shanghai 200240,China

关键词：

Experimental characterization Finite element method Elastic-plastic contact behaviors Digital image correlation

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

1227222711732009

出版年：

2024

DOI：

10.1007/s10409-023-23479-x

力学学报(英文版)

CSTPCD

影响因子：0.363

ISSN：0567-7718

年,卷(期)：2024.40(5)