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6005A铝合金静轴肩搅拌摩擦焊接头性能研究 被引量:2
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作者 刘仁高 陈勇 《技术与市场》 2018年第5期59-60,63,共3页
通过对列车壁板6005A型材进行静轴肩搅拌摩擦焊试验,获得质量较高的搅拌摩擦焊焊缝,对其进行力学检测与微观组织观测,试验结果表明:当焊速达到1 000 mm/min时,接头抗拉强度保持在母材的70%~73%之间,屈服强度是母材的53%~56%,弯曲检测中... 通过对列车壁板6005A型材进行静轴肩搅拌摩擦焊试验,获得质量较高的搅拌摩擦焊焊缝,对其进行力学检测与微观组织观测,试验结果表明:当焊速达到1 000 mm/min时,接头抗拉强度保持在母材的70%~73%之间,屈服强度是母材的53%~56%,弯曲检测中,当转速较低时,背弯检测出现裂纹,随着转速升高裂纹消失。焊缝横截面组织均匀,但仍有s型曲线存在,焊缝表面平整,无飞边等缺陷。 展开更多
关键词 静轴肩搅拌摩擦焊 力学检测 微观组织观测
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Macro-micro investigation of granular materials in torsional shear test 被引量:6
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作者 李博 郭林 张丰收 《Journal of Central South University》 SCIE EI CAS 2014年第7期2950-2961,共12页
A three-dimensional numerical torsion shear test is presented on hollow cylinder specimen which is performed on a spherical assemblage with fixed principal stress axes using the discrete element code PFC3D.Stack wall ... A three-dimensional numerical torsion shear test is presented on hollow cylinder specimen which is performed on a spherical assemblage with fixed principal stress axes using the discrete element code PFC3D.Stack wall technique boundary conditions are employed and optimized to reasonably capture the microstructure evolution.Parametric studies are conducted in terms of the ratio κ,normal and shear stiffness of particles,wall stiffness and friction coefficients.Afterwards,in comparison with physical test,numerical results for a fixed principal stress angle(α=45°) are presented.The results show that the numerical test could capture the macro-micro mechanical behavior of the spherical particle assembly.The evolution of the coordination number demonstrates that particles in shear banding undergo remarkable decrease.The effects of localization on specimens illustrate that global stress and strain recorded from a hollow cylinder apparatus could not represent the localized response.The shearing band initiation and evolution from porosity and shear rate are visualized by contour lines in different shear strains. 展开更多
关键词 hollow cylinder apparatus numerical modeling principal stress rotation strain localization
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