IMPACT AND POSTIMPACT BEHAVIOR OF FOAM CORE SANDWICH STRUCTURES
IMPACT AND POSTIMPACT BEHAVIOR OF FOAM CORE SANDWICH STRUCTURES
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DOI：
10.1016/0263-8223(94)90035-3
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发表时间：
1994-01-01
影响因子：
6.3
通讯作者：
TETI, R
中科院分区：
文献类型：
--
作者：
CAPRINO, G;TETI, R
对玻璃纤维增强塑料面板和聚氯乙烯泡沫芯材制成的夹层板进行了低速、仪器化冲击试验。 三种不同的核心密度和三个核心厚度进行了检查。 定义损伤参数D以说明通过目视检查评价的纤维损伤尺寸。 实验结果表明，D只取决于冲击能量，而它基本上是独立的核心密度和厚度。 这种行为的解释是制定的基础上记录的冲击history.The拉伸试验的结果，进行评估后的剩余强度的面料的影响，进行了分析，使用以前的模型，修改根据Cantwell和莫顿进行的实验工作的结果。 由冲击损伤确定的强度损失和人工植入圆孔之间的相关性。 因此，一个程序，允许一个准确的预测后的剩余强度的影响作为动能的函数。最后，它表明，剩余强度可以合理地预测的基础上的损伤参数D，虽然在某些情况下，这可能会导致在一个非保守的估计的复合材料的承载能力。
Low velocity, instrumented impact tests were carried out on sandwich panels made of glass fiber reinforced plastic facings and polyvinylchloride foam core. Three different core densities and three core thicknesses were examined. A damage parameter D was defined to account for the fiber damage size as evaluated through visual inspection. The experimental results demonstrate that D depends only on impact energy, whereas it is substantially independent of core density and thickness. An explanation for this behavior is formulated on the basis of recorded impact history.The results of tensile tests, performed to assess the residual strength after impact of the facing material, were analyzed using a previous model, modified according to the findings of an experimental work carried out by Cantwell and Morton. A correlation is found between the strength loss determined by impact damage and artificially implanted circular holes. Accordingly, a procedure is presented to allow for an accurate prediction of residual strength after impact as a function of kinetic energy.Finally, it is shown that residual strength can be reasonably predicted on the basis of damage parameter D, although in some cases this can result in a non-conservative estimate of the composite load-carrying capability.