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孔挤压过程中孔边应力应变演化规律的试验与模拟研究 被引量:5

EXPERIMENTAL AND SIMULATION STUDY ON EVOLUTION OF STRESS AND STRAIN DURING THE HOLE EXPANSION
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摘要 该文采用挤压棒直接挤压的方法对LY12CZ铝合金进行孔挤压试验,测试了在不同过盈量、不同润滑条件下挤压时挤压力和孔边应变变化曲线。建立三维有限元模型,对挤压过程开展了数值模拟。结合试验和模拟结果,揭示了挤压过程中孔边应力应变的演化和分布规律;挤压力的变化特征以及摩擦系数和过盈量对挤压力的影响;孔的深度方向切向应力在挤压过程中的分布及孔边残余压应力的来源与演变。模拟值与试验测量值吻合良好,验证了有限元模拟的可靠性。 The hole expansion experiments were performed on LY12CZ aluminum alloy plate using a mandrel. The extrusion force and strain around the hole were measured under various interference values and friction coefficients. A 3D finite element model was built and the expansion process was simulated according to the experimental conditions. The results of experiments and simulations reveal the following regularities: 1) the evolution and distribution of stress and strain near the expanded hole; 2) the variation of the extrusion force under different interference values and friction coefficients; 3) the distribution of the tangential stress along the depth of the hole; 4) the origination and evolution of residual compressive stress around the hole. The simulation results are in good agreement with the experiments, which validate the reliability of the simulations.
出处 《工程力学》 EI CSCD 北大核心 2013年第11期55-60,66,共7页 Engineering Mechanics
基金 国家自然科学基金项目(11102163) 西北工业大学研究基金项目(JC20110218)
关键词 挤压力 应力应变 有限元 挤压过程 过盈量 extrusion force stress and strain finite element hole expansion process interference value
作者简介 通讯作者:段苗苗(1988-),女,陕西人,硕士生,从事工程力学研究(E_mail:duanmiaomia00209@mail.nwpu.edu.cn). 耿小亮(1976-),男,山西人,高工,博士,从事固体力学研究(E—mail:gengxiaoliang@nwpu.edu.cn); 张永久(1986-),男,河南人,硕士生,从事工程力学研究(E—mail:zhyongjiu9886@163.com); 黄剑贤(1989-),男,福建人,硕士生,从事固体力学研究(E—mail:huangjianxian@mail.nwpu.edu.cn); 岳珠峰(1965-),男,江苏人,教授,博士,长江学者,博导,从事固体力学研究fE—mail:zfyue@nwpu.edu.com).
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