位移模式下PMI泡沫夹层结构疲劳损伤试验研究

发布时间：2018-03-11 15:43

本文选题：PMI泡沫　切入点：夹层结构　出处：《力学季刊》2017年01期 　论文类型：期刊论文

【摘要】：论文选取磁悬浮列车车身所用的由铝面板与聚甲基苯丙酰亚胺(PMI)聚合物泡沫芯层所组成的轻质夹层复合材料为研究对象,对夹层结构在室温下进行静态强度测试和进行以位移为控制变量的疲劳损伤演化试验,探讨分析了PMI泡沫夹层结构在交变位移控制下的疲劳性能和破坏行为.给出了PMI泡沫夹层结构在静态载荷作用下的力学性能参数.参考静态试验结果加载适当的位移载荷进行疲劳试验,发现在位移控制模式下,夹层结构的疲劳损伤过程和破坏模式明显区别于载荷控制模式.当最大控制位移较小时破坏形式为面板与泡沫层脱离;位移较大时为面板断裂和泡沫芯层塌陷.通过引入载荷的变化作为损伤参量建立了位移控制模式下损伤演变公式,并对两种模式的破坏行为进行了较好的预测.
[Abstract]:This paper selects the maglev train body used by aluminum panel and poly methyl phenyl imide (PMI) lightweight sandwich composite polymer foam core layer as the research object, the sandwich structure at room temperature, static strength test and fatigue damage evolution based on displacement test control variables, analysis of PMI foam sandwich structure in alternating displacement under the control of fatigue properties and failure behavior under static loading. The mechanical properties of PMI foam sandwich structure parameters are given. The static test results of fatigue test reference loading the appropriate displacement load, found in the displacement control mode, the fatigue damage process and failure modes of sandwich structure is obviously different from the load control mode. When the maximum displacement control is small from damage in the form of panel and the foam layer; displacement is larger for fracture of the plate and the foam core layer collapse through. The damage evolution formula under the displacement control model is established by introducing the change of the load as the damage parameter, and the failure behavior of the two modes is well predicted.

【作者单位】：上海交通大学船舶海阳与建筑工程学院;
【基金】：国家自然科学基金(11102107) 上海市自然科学基金项目(16ZR1417700)
【分类号】：TB333

【相似文献】