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Mode-I fracture toughness and surface morphology evolution for contaminated adhesively bonded composite structures

机译：污染的粘合复合结构的I型断裂韧性和表面形态演变

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摘要

This study explores the effect of environmental contamination level on mode-I failure and fracture surface evolution of adhesively bonded composite joints. We examined a common adhesive/adherend material system (Hysol EA9394/Hexcel IM7-G/8552) exposed to a typical aviation hydraulic fluid (MIL-PRF-87257) at varying contaminant concentrations. The macroscopic bond line fracture toughness measurement by double cantilever beam test exhibited a progressive deterioration with increasing contaminant concentration. Even a trace level (3 mu g/cm(2)) resulted in a 15% reduction of average bond line strength and 30% drop in bond line toughness. An Arrhenius-type correlation between interface toughness and contaminant concentration was observed, with potential to predict the bond line toughness deterioration level. Increasing the contaminant concentration changed the fracture surface morphology from ductile-to-brittle failure mode, driven by diminished plasticity within the adhesive layer. Finite element method employing cohesive surfaces was also utilized to rationalize the experimentally observed trends. The combined experimental and numerical results suggest that the bond line contamination deteriorates the interfacial toughness through two mechanisms: (i) weakening the interfacial bonding strength, and thereby reducing the intrinsic interfacial toughness, and (ii) shielding the plastic energy dissipation within the adhesive layer, and leading to a reduction in the overall effective bond line toughness.
机译：这项研究探讨了环境污染水平对I型失效和粘合复合材料接头断裂表面演变的影响。我们研究了一种普通的粘合剂/粘附材料系统（Hysol EA9394 / Hexcel IM7-G / 8552），它在不同的污染物浓度下暴露于典型的航空液压油（MIL-PRF-87257）。通过双悬臂梁测试的宏观粘结线断裂韧性测量显示出随着污染物浓度增加而逐渐恶化。甚至痕量水平（3μg / cm（2））都会导致平均粘合线强度降低15％，粘合线韧性降低30％。观察到界面韧性和污染物浓度之间的阿累尼乌斯型相关性，具有预测粘合线韧性恶化水平的潜力。污染物浓度的增加是由于粘合层内部塑性降低而导致的断裂表面形态从韧性转变为脆性破坏模式。还采用了采用粘性表面的有限元方法来合理化实验观察到的趋势。实验和数值结果相结合，表明粘结线污染通过两种机制降低了界面韧性：（i）削弱了界面粘结强度，从而降低了固有界面韧性，以及（ii）屏蔽了胶层内部的塑性能耗散，并导致整体有效粘结层韧性降低。

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