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首页> 外文会议>Proceedings of the American Society for Composites Twenty-Ninth technical conference, Proceedings of the 16th US-JAPAN conference on composite materials ASTM-D30 meeting >Loading Rate Effects on Mode Ⅰ Delamination of Z-pinned Composite Laminates
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Loading Rate Effects on Mode Ⅰ Delamination of Z-pinned Composite Laminates

机译：加载速率对Z钉复合材料层压板Ⅰ型分层的影响

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摘要

Z-pinning has been used as through the thickness reinforcement method tornimprove the delamination characteristics of the fiber reinforced composites. In thisrnstudy, delamination performance of the z-pinned carbon fiber composite laminatesrnunder high rate loading is investigated using a flying wedge method. A metal wedgernwas driven into pre-notched laminate specimen at a constant velocity to obtain thernmode Ⅰ delamination performance of unpinned and z-pinned composites. The criticalrnmode Ⅰ strain energy release rate was observed to increase with increasing wedgernvelocity for unpinned laminates. Strain energy release rate first decreased withrnincreasing velocity until wedge velocity of 40 m/s and then increased as velocity wasrnincreased to 50 m/s. This behavior can be explained by the observed change in crackrnpropagation behavior from stick-slip to stable, continuous crack propagation for zpinnedrncomposites. Pull-out behavior of z-pins from an adhesive was furtherrninvestigated using high speed x-ray imaging. The z-pins were observed to tear-offrnstarting from the rear end of the pin from the adhesive as they were pulled at arnconstant velocity. The tear-off behavior was observed to be affected by the defectsrnpresent in the cured adhesive.
机译：Z钉扎法已通过厚度增强法用于改善纤维增强复合材料的脱层特性。在这项研究中，使用飞楔方法研究了z-钉扎碳纤维复合材料层压板在高速率载荷下的脱层性能。以恒定的速度将金属楔形物打入预先开槽的层压板样本中，以获得未钉扎和z钉扎复合材料的rnmodeⅠ分层性能。观察到非钉扎层板的临界Ⅰ型应变能释放速率随楔形速度的增加而增加。应变能释放率首先随着速度的增加而降低，直到楔形速度为40 m / s，然后随着速度的增加而增加至50 m / s。这种现象可以通过观察到的裂纹扩展行为从粘滑到zpinnedrn复合材料稳定，连续的裂纹扩展的变化来解释。使用高速X射线成像技术进一步研究了Z销从粘合剂中的拉出行为。观察到z销在以恒定速度拉动时从销的后端开始从粘合剂上撕下。观察到剥离行为受固化的粘合剂中存在的缺陷影响。

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