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为了研究激光冲击喷丸与激光辐照处理后LY12铝合金材料的微尺度变形特点和失效机理,对经过不同激光功率密度处理后的LY12铝合金材料,在扫描电镜下进行了原位拉伸力学行为和失效机理研究。在扫描电子显微镜(SEM)下,得到各组试件的拉伸载荷曲线和不同载荷下的微观区域图像,并利用数字图像相关技术进行不同载荷下的微观区域全场变形分析,并对拉伸断口形貌也进行了分析。研究表明:激光处理的功率大小对LY12铝合金拉伸最大载荷有明显的影响,激光处理的交界处有较强的应变集中。 相似文献
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短道速滑运动员在弯道高速滑行过程中需保持身体大幅度倾斜,这一现象背后蕴含着经典的力学原理,是力学教学与实践中极为有价值的案例。本文通过对短道速滑运动员高速过弯时的运动学描述以及动力学分析来对短道速滑运动员大幅度倾斜身体过弯的力学原理进行解释。通过牛顿第一、第二定律以及实验观测来获得质点做匀速圆周运动时向心加速度的计算公式。借助动力学理论中的达朗贝尔原理在与运动员随动的非惯性系统中引入惯性力,通过力系平衡分析来探究运动员过弯时大幅度倾斜身体的必要性,并给出运动员过弯时身体倾角的计算公式,借助模拟赛道实验来验证相关的分析结论。通过讨论短道速滑运动员在比赛中根据既定战术和现场比赛情况随时变化的线速度以及内外赛道的切换需要来分析运动员在过弯时的各类运动学参数的变化,给出影响运动员高速过弯的关键因素。 相似文献
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This paper discusses an in situ observation of fracture behavior around a crack tip in ferroelectric ceramics under combined
electromechanical loading by use of a moiré interferometry technique. The deformation field induced by the electric field
and the stress concentration near the crack tip in three-points bending experiments was measured. By analysis of the moiré
images it is found that under a constant mechanical load, the electric field almost has no effect on the crack extension in
the case that the directions of the poling, electric field and crack extension are perpendicular to each other. When the poling
direction is parallel to the crack extension direction and perpendicular to the electric field, the strain decreases faster
than that calculated by FEM with and without electrical loading as one goes away from the crack tip. In addition, as the electric
field intensity increases, the strain near the crack tip increases, and the strain concentration becomes more significant.
The project supported by the National Natural Science Foundation of China (10132010, 10025209, 10232023) 相似文献