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New method for the evaluation of residual compressive strengths of sandwich panels via four-point bending

机译：通过四点弯曲评估夹芯板残余抗压强度的新方法

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摘要

There is presently no standard test method for evaluating compression-after-impact (CAI) strengths of sandwich panels. A direct adaption of existing end-loaded CAI method for monolithic laminates by up-scaling the dimensions of a standard specimen shows little usefulness and could lead to such large sandwich panel sizes so that generating CAI design data in such approach would increase material costs significantly and hence be prohibitively expensive. This work develops a low-cost alternative via four-point bending, using a drilled hole of a selected diameter to represent impact damage. A challenge of this development for as-received sandwich beams with a core of a single constant density is to gain a deeper physical insight into desirable construction configurations, in which the compressive skin could fail in flexure consistently for given support span-to-thickness ratio. Sandwich construction encompasses a wide range of combinations of intrinsic parameters and hence some parametric study was essential, including varying skin thickness, lay-up, core density, skin material and sandwich symmetry in addition to the diameter of a hole. It was found that core density and compressive skin thickness were the major factors of significantly influencing the failure modes of the sandwich beams.
机译：当前没有用于评估夹心板的冲击后压缩（CAI）强度的标准测试方法。通过扩大标准样品的尺寸直接将现有的端载CAI方法改用于整体式层压板显示出几乎没有用处，并且可能导致如此之大的夹心板尺寸，以这种方式生成CAI设计数据将显着增加材料成本，并且因此非常昂贵。这项工作通过使用选定直径的钻孔来表示冲击破坏，通过四点弯曲来开发一种低成本的替代方法。对于具有单个恒定密度纤芯的已接收夹心梁，这种发展的挑战是对所需的构造进行更深入的物理洞察，其中在给定的支撑跨度-厚度比下，受压蒙皮可能始终无法弯曲。夹层结构包含多种内在参数组合，因此一些参数研究是必不可少的，除了孔的直径之外，还包括变化的蒙皮厚度，叠层，芯密度，表皮材料和夹心对称性。发现芯密度和表皮压缩厚度是显着影响夹层梁破坏模式的主要因素。

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