摘要
利用非局部作用思想的近场动力学理论,可以通过求解空间积分方程描述物质点运动规律,准确描述切削过程材料剧烈塑性变形导致的裂纹扩展和断裂破坏行为。本文基于常规态基近场动力学方法构建Ti_(2)AlNb弹塑性本构模型,融合材料失效和接触准则,求解离散处理的近场动力学基本运动方程,建立了适用于Ti_(2)AlNb切削仿真研究的态型近场动力学数值模型,模拟分析了Ti_(2)AlNb直角切削切屑形成过程。通过试验验证,表明近场动力学仿真可以准确模拟Ti_(2)AlNb切削切屑形成过程中材料变形和损伤演化规律。本方法预测的切屑形成剪切角40.23°与试验结果38.89°相比,误差为3.45%;定义损伤空间分布的半峰宽值(FWHM)为切削第1变形区宽度,其预测值为0.06mm,预测误差小于7%。
Based on the idea of nonlocal theory,peridynamics describes the movement of material particles by solving spatial integral equations.It is suitable for describing the crack growth and fracture behavior of workpiece materials during severe plastic deformation in cutting process.In this paper,the elastoplastic constitutive model of Ti_(2)AlNb is constructed based on ordinary state-based peridynamics,and material failure and contact criteria are developed.By solving discrete basic motion equations,a state-based peridynamics numerical model is established to study the cutting process of Ti_(2)AlNb alloy.Then the chip formation process for orthogonal cutting of Ti_(2)AlNb is simulated and analyzed.The results demonstrate that the peridynamics method can accurately simulate the material deformation and damage evolution during machining of Ti_(2)AlNb.The error between the predicted chip shear angle of 40.23°and the experimental result of 38.89°is 3.45%.The full width at half maximum of the damage spatial distribution is defined as the width of the primary shear zone,and the predicted value is 0.06 mm with an error of less than 7%.
作者
刘浩
王兵
刘战强
李亮亮
蔡玉奎
宋清华
LIU Hao;WANG Bing;LIU Zhanqiang;LI Liangliang;CAI Yukui;SONG Qinghua(Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE,School of Mechanical Engineering,Shandong University,Jinan 250061;National Demonstration Center for Experimental Mechanical Engineering,Shandong University,Jinan 250061;AVIC Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang 110850)
出处
《航空制造技术》
CSCD
北大核心
2023年第5期68-75,共8页
Aeronautical Manufacturing Technology
基金
国家自然科学基金项目(52175420)
中国科协青年人才托举工程(YESS20210009)
山东省优秀青年科学基金(2022HWYQ–059)
高校基本科研业务费资助项目(2021JCG009)。
