The effect of heat treatment in an electric field on micro plastic deformation characteristics of 2024 Al alloy was investigated. The mechanism of aging in an electric field affecting the micro plastic deformation beh...The effect of heat treatment in an electric field on micro plastic deformation characteristics of 2024 Al alloy was investigated. The mechanism of aging in an electric field affecting the micro plastic deformation behavior was preliminarily discussed. The results show that the resistance to micro plastic deformation of the alloy can be greatly increased by aging in an electric field. Aging temperature, aging time and electric field strength are selected by adopting the orthogonal design method and the optimum technological parameters are obtained.展开更多
目的通过有限元方法探讨轴向微动接骨板固定股骨骨折的生物力学特性,为新型骨植入物的研发和临床应用提供生物力学基础。方法选取1名健康成年男性志愿者,行CT扫描后三维重建股骨模型及10mm骨折;构建1mm轴向微动接骨板,通过700N轴向、10N...目的通过有限元方法探讨轴向微动接骨板固定股骨骨折的生物力学特性,为新型骨植入物的研发和临床应用提供生物力学基础。方法选取1名健康成年男性志愿者,行CT扫描后三维重建股骨模型及10mm骨折;构建1mm轴向微动接骨板,通过700N轴向、10N·m扭转、250N前后四点弯曲和250N内外四点弯曲4种工况有限元仿真,比较轴向微动接骨板和传统锁定接骨板的生物力学特性。结果四种工况下,轴向微动接骨板应力均值均小于传统锁定接骨板(31.15MPa vs 46.51MPa,12.92MPa vs 18.25MPa,3.67MPa vs 4.23MPa,4.51MPa vs 4.94MPa);微动接骨板疲劳寿命略小于锁定接骨板,但超出设计使用寿命34.7%;微动接骨板模型中螺钉平均应力小于锁定接骨板模型,且股骨应力最大值和平均值均小于锁定接骨板模型。结论新型轴向微动接骨板具有更加仿生的生物力学性能,不但可以分散接骨板和螺钉结合处的应力集中,减少断钉风险,同时可以降低股骨所受应力,具有进一步开发的潜力。展开更多
文摘The effect of heat treatment in an electric field on micro plastic deformation characteristics of 2024 Al alloy was investigated. The mechanism of aging in an electric field affecting the micro plastic deformation behavior was preliminarily discussed. The results show that the resistance to micro plastic deformation of the alloy can be greatly increased by aging in an electric field. Aging temperature, aging time and electric field strength are selected by adopting the orthogonal design method and the optimum technological parameters are obtained.
文摘目的通过有限元方法探讨轴向微动接骨板固定股骨骨折的生物力学特性,为新型骨植入物的研发和临床应用提供生物力学基础。方法选取1名健康成年男性志愿者,行CT扫描后三维重建股骨模型及10mm骨折;构建1mm轴向微动接骨板,通过700N轴向、10N·m扭转、250N前后四点弯曲和250N内外四点弯曲4种工况有限元仿真,比较轴向微动接骨板和传统锁定接骨板的生物力学特性。结果四种工况下,轴向微动接骨板应力均值均小于传统锁定接骨板(31.15MPa vs 46.51MPa,12.92MPa vs 18.25MPa,3.67MPa vs 4.23MPa,4.51MPa vs 4.94MPa);微动接骨板疲劳寿命略小于锁定接骨板,但超出设计使用寿命34.7%;微动接骨板模型中螺钉平均应力小于锁定接骨板模型,且股骨应力最大值和平均值均小于锁定接骨板模型。结论新型轴向微动接骨板具有更加仿生的生物力学性能,不但可以分散接骨板和螺钉结合处的应力集中,减少断钉风险,同时可以降低股骨所受应力,具有进一步开发的潜力。
基金National High-Technology Research &Development Program of China (2007AA03Z330)National Key Development Programfor Basic Research of China(2009CB623305)+3 种基金Foundation for Innovative Research Groups of the National Natural ScienceFoundation of China (50821004)National Science Foundation of China (1077411310876041)Nanotechnology Project of Shanghai Science and Technology Committee (0852nm06900)
