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Compression After Impact Testing

机译：冲击测试后的压缩

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During the late 1960s and most of the 1970s, the composites industry was absorbing the impact of what was then the recent introduction of carbon fiber. The resulting composites exhibited both high strength-to-weight and high stiffness-to-weight ratios. And white it was known that composites reinforced with this new material exhibited limited toughness, there were many more pressing technical concerns to be addressed at the time, including how to implement them in existing designs. However, by the early 1980s, there was increasing interest in the "effects of defects," as it was popularly termed, particularly in these brittle carbon fiber composites. Among these defects are those that are deliberately introduced, such as fastener holes and access cutouts. These controlled defects create stress concentrations that can significantly degrade the strength of a brittle material. Uncontrolled induced defects also were becoming a concern. The classic cases involved low-velocity impact, such as a wrench dropped on a composite aircraft wing surface or a composite leading edge striking a hangar door as an aircraft is being towed. As I discussed in a previous
机译：在1960年代后期和1970年代的大部分时间里，复合材料行业正在吸收当时刚引入的碳纤维的影响。所得复合材料显示出高强度重量比和高刚性重量比。白色是众所周知的，用这种新材料增强的复合材料显示出有限的韧性，当时还有许多紧迫的技术问题需要解决，包括如何在现有设计中实现它们。但是，到了1980年代初期，人们对“缺陷的影响”的关注日益增加，尤其是在这些脆性碳纤维复合材料中。这些缺陷中包括故意引入的缺陷，例如紧固件孔和通道切口。这些受控缺陷产生的应力集中会显着降低脆性材料的强度。不受控制的诱发缺陷也成为一个问题。经典案例涉及低速撞击，例如，在拖曳飞机时，将扳手掉落在复合材料飞机机翼表面上，或者复合材料前缘撞击机库门。正如我之前讨论的

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