以1600 k N伺服机械压力机的滑动轴瓦为研究对象,对轴瓦工作时的受力状态进行数值模拟分析,并采用压力测量胶片在10 k N微型压力机上进行了轴瓦受力的实验验证。结果表明,工作时轴瓦所承受的应力主要发生在其正下方区域,应力的大小从中...以1600 k N伺服机械压力机的滑动轴瓦为研究对象,对轴瓦工作时的受力状态进行数值模拟分析,并采用压力测量胶片在10 k N微型压力机上进行了轴瓦受力的实验验证。结果表明,工作时轴瓦所承受的应力主要发生在其正下方区域,应力的大小从中间向两端逐渐减少,应力分布不均匀。轴瓦与轴之间接触压力和摩擦切应力的分布规律与等效应力的相似。轴瓦厚度增加能降低轴瓦所承受的应力,有效提高轴瓦的承载能力。轴瓦与轴之间较大的配合间隙将导致轴瓦承载区域减小,轴瓦所受的应力增大。轴瓦与轴承座之间的过盈配合能使轴瓦的承载面积明显增大,最大等效应力降低,应力分布更均匀。展开更多
Based on CT scanning pictures from a volunteer＇s knee joint, a three-dimensional finite element model of the healthy human knee joint is constructed including complete femur, tibia, fibular, patellar and the main car...Based on CT scanning pictures from a volunteer＇s knee joint, a three-dimensional finite element model of the healthy human knee joint is constructed including complete femur, tibia, fibular, patellar and the main cartilage and ligaments. This model was validated using experimental and numerical results obtained from other authors. The pressure distribution of contact surfaces of knee joint are calculated and analyzed under the load action of ‘heel strike＇, ‘single limb stance＇ and ‘toe-off＇. The results of the gait cycle are that the contact areas of medial cartilage are larger than that of lateral cartilage; the contact force and contact areas would grow larger with the load increasing; the pressure of lateral meniscus is steady, relative to the significant variation of peak pressure in medial meniscus; and the peak value of contact pressure on all components are usually found at about 4570 of the gait cycle.展开更多
文摘以1600 k N伺服机械压力机的滑动轴瓦为研究对象,对轴瓦工作时的受力状态进行数值模拟分析,并采用压力测量胶片在10 k N微型压力机上进行了轴瓦受力的实验验证。结果表明,工作时轴瓦所承受的应力主要发生在其正下方区域,应力的大小从中间向两端逐渐减少,应力分布不均匀。轴瓦与轴之间接触压力和摩擦切应力的分布规律与等效应力的相似。轴瓦厚度增加能降低轴瓦所承受的应力,有效提高轴瓦的承载能力。轴瓦与轴之间较大的配合间隙将导致轴瓦承载区域减小,轴瓦所受的应力增大。轴瓦与轴承座之间的过盈配合能使轴瓦的承载面积明显增大,最大等效应力降低,应力分布更均匀。
基金supported by the National Natural Science Foundation of China(No.10702048).
文摘Based on CT scanning pictures from a volunteer＇s knee joint, a three-dimensional finite element model of the healthy human knee joint is constructed including complete femur, tibia, fibular, patellar and the main cartilage and ligaments. This model was validated using experimental and numerical results obtained from other authors. The pressure distribution of contact surfaces of knee joint are calculated and analyzed under the load action of ‘heel strike＇, ‘single limb stance＇ and ‘toe-off＇. The results of the gait cycle are that the contact areas of medial cartilage are larger than that of lateral cartilage; the contact force and contact areas would grow larger with the load increasing; the pressure of lateral meniscus is steady, relative to the significant variation of peak pressure in medial meniscus; and the peak value of contact pressure on all components are usually found at about 4570 of the gait cycle.
文摘介绍铁路路基动态变形模量理论计算公式的推导及动态变形模量的测试原理,采用有限元软件模拟动态变形模量的测试过程,分析承载板与土体接触压力、路基动态变形模量的影响因素,并计算动态变形模量的有效测试深度.结果表明:在承载板中心一定范围内,接触压力模拟结果较理论计算值大;土体的动弹性模量对接触压力影响很小,可以忽略;路基动态变形模量测试冲击荷载作用下,土体只发生弹性变形;动态变形模量与土体动弹性模量呈线性关系,路基动态变形模量的模拟结果大于理论计算值;土体的泊松比对动态变形模量影响较小;动态变形模量有效测试深度建议取0.5~0.6 m.
