交变负荷产生的关节软骨压缩变形行为研究  

Research on Indentation Deformation Produced by Alternating Loads from Articular Cartilage

作　　者：钱善华[1] 葛世荣[2] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116 [2]中国矿业大学摩擦学与可靠性工程研究所

出　　处：《中国矿业大学学报》2008年第3期360-363,378,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(50535050);江苏省自然科学基金项目(BK2005403,BK2005019)

摘　　要：基于认识关节软骨在定负荷与正弦负荷交变作用下的变形特征,采用UMT-2型多功能试验机对牛膝关节软骨的压缩变形进行测定.基于五点滑动平均法对测得压缩变形进行分解,提取相应的波动变形量;通过傅立叶变换获得交变负荷和变形对应的幅值和相位.结果表明,交变负荷产生的压缩变形高于定负荷的变形.交变负荷形成的压缩变形是由稳态非线性增长变形量和瞬时波动变形量组成.交变负荷幅值对非线性增长变形量的影响较小,而对瞬时波动变形量有着显著影响.交变负荷幅值对负荷与变形的幅值比和变形滞后于负荷的相位差影响较小,其幅值比和相位差分别约为9.1和0.25.Based on understanding the deformation characteristic of articular cartilage affected by alternating loads of constant load and sine load, the indentation deformation of bovine knee articular cartilage was measured using an UMT-2 Multi-Specimen test-bed. Indentation deformations were decompounded by five-point sliding average method to gain the relevant wavy deformation. Magnitudes and phases corresponding to alternating load and deformation were obtained by Fourierism transform. The results show that the indentation deformation produced by alternating load is obviously higher than that by constant load. The indentation deformation of alternating load is composed of the stably nonlinear increase and the instantaneously wavy. The magnitudes of alternating load play a less role on the deformation of nonlinear increase, and bigger influence on the instantaneously wavy deformation. The load magnitude play a less role on the ratio of alternating load to deformation and phase difference of deformation lagging load. The ration and phase difference is about 9.1 and 0. 25, respectively.

关 键 词：关节软骨 交变负荷 相位滞后 傅立叶变换 

分 类 号：TH117[机械工程—机械设计及理论]