Progressive crushing tests of a unidirectionally laminated carbon fiber-reinforced plastic (CFRP) rectangular plate were carried out to reveal its continuous fracture behavior and energy absorption. Three types of trigger geometry, chamfer, steeple, and V-shaped, were machined on each specimen. A film-embedded V-shaped trigger was also prepared to investigate the effect of initial cracks on the energy absorption. The initial fracture behavior strongly affected the ensuing stable fracture process. The V-shaped trigger specimen was robust as the gauge length varied, in contrast to the chamfer and steeple trigger specimens which absorbed less energy with a longer gauge length. A column-like pillar was observed between the fronds during the crushing. Fiber fractures were observed periodically at 50–100 μm lengths in the pillar section, which coincides with the length of the kink band in CFRP ultimate compressive failures. The pillar thickness was a dominant factor in the energy absorption of unidirectional CFRP.

中文翻译：

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单向CFRP板在轴向压缩下的渐进破碎行为和能量吸收

对单向层压碳纤维增强塑料 (CFRP) 矩形板进行了渐进式破碎试验，以揭示其连续断裂行为和能量吸收。在每个试样上加工了三种类型的触发器几何形状，倒角、尖顶和 V 形。还制备了嵌入薄膜的 V 形触发器来研究初始裂纹对能量吸收的影响。初始断裂行为强烈影响随后的稳定断裂过程。V 形扳机试样随着标距长度的变化而坚固，与斜面和尖顶扳机试样相反，后者吸收较少的能量，标距较长。在粉碎过程中，在叶状体之间观察到柱状柱子。在柱子部分定期观察到长度为 50-100 μm 的纤维断裂，这与 CFRP 极限压缩破坏中扭结带的长度一致。柱体厚度是单向 CFRP 能量吸收的主要因素。