| 刘畅,岳珠峰*,耿小亮,王佩艳,李德勇.PMI复合材料泡沫夹层结构小能量冲击后回弹规律研究[J].实验力学,2015,30(6):757~767 |
| PMI复合材料泡沫夹层结构小能量冲击后回弹规律研究 |
| On the Rebound Regularity of PMI Foam Core Composite Structure Subjected to Low Energy Impact |
| 投稿时间：2015-03-16 修订日期：2015-05-12 |
| DOI：10.7520/1001-4888-15-036 |
| 中文关键词: 泡沫夹芯 低速冲击 三维扫描 数值拟合 回弹规律 破坏性检测 |
| 英文关键词:foam core low-speed impact three-dimensional scanning numerical fitting rebound regularity destructive inspection |
| 基金项目:国家自然基金(51305351); 高等教育博士点基金(20136102120031); 航空科学基金(2013ZA53010); 西北工业大学联合培育项目(3102014JGL01005) |
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| 中文摘要: |
| 本文对两种不同厚度(4层、8层)的PMI复合材料泡沫夹芯结构进行8J的低速冲击实验。采用三维光学扫描仪(HDI 3D)对冲击后发生的凹坑回弹现象进行90h的监测,并结合Geomagic Qualify三维检测软件对扫描结果进行分析,获得了直观的冲击后位移云图。对不同时刻的凹坑深度进行分析,以回弹速率为标志,对回弹过程进行划分并总结了凹坑深度随时间的变化规律；截取了回弹过程中部分时刻凹坑贯穿截面轮廓,通过参考点对轮廓形貌进行拟合,建立了与所在横截面凹坑最大值相关联的轮廓形貌描述方法。结合破坏性检测的方法,对冲击区域面板及夹芯泡沫的损伤情况进行显微观测,结果表明,夹层板的分层损伤对回弹现象影响较大,但凹坑截面轮廓的形态并不会发生显著改变。 |
| 英文摘要: |
| In this paper, low-speed impact experiment (8J) for PMI composite foam sandwich structure with two different thicknesses (4 or 8 layers of foam respectively) was carried out. HDI 3D optical scanner was adopted to monitor the dent rebound phenomenon after impact for 90 hours. Then the obtained results were analyzed by three-dimensional detecting software Geomagic Qualify. Finally, intuitionistic displacement contours after low-speed impact were obtained. Analyzing the dent depth at different times, taking rebound rate as a sign, the rebound process was divided into two stages and the variation of dent depth with time was summarized. Part of cross-sectional profile of dent during rebound process was intercepted. Through fitting the contour shape by reference point, a contour shape description method related with the maximum value of dent in the cross section was established. Adopting destructive inspection method, damage microscopic observation of the plate and sandwich foam within impacted zone was carried out. Results indicate that delamination damage of sandwich plate has a great influence on rebound, while dent cross section contour shape is not changed significantly. |
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