Drilling Damage of GFRP and Residual Mechanical Behavior—Part I: Drilling Damage Generation

E. Capello, V. Tagliaferri
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引用次数: 31

Abstract

The drilling of composite laminates generates several kinds of damage that can be detrimental to the mechanical behavior around the hole. The present work is the first part of a study that investigates the effect of the drilling on the residual mechanical behavior of glass fiber reinforced plastic (GFRP) laminates when the hole is subjected to bearing load. In the first part, the influence of drilling parameters on the type and extension of the damage is analyzed. The damage is described at the macro level (delaminated area) and at the micro level (cracks, fiber-matrix debonding, etc.). The Design of Experiments and Analysis of Variance techniques are used in order to determine the statistical influence of the drilling parameters on the delamination area. Moreover, the effects of drilling with or without a support beneath the specimens are analyzed and discussed. Results indicate that the degree of peel-up delamination depends on the feed rate and on the helix angle of the twist drill. Push-down delamination is mainly affected by the feed rate, by the presence of support beneath the specimen, and by the twist drill temperature.
玻璃钢的钻削损伤及残余力学行为——第一部分:钻削损伤的产生
复合材料层压板在钻孔过程中会产生几种损伤,这些损伤会对孔周围的力学性能产生不利影响。本研究是研究钻孔对玻璃纤维增强塑料(GFRP)层压板在孔承受承载时残余力学行为影响的第一部分。第一部分分析了钻孔参数对损伤类型和扩展的影响。损伤描述在宏观层面(分层区域)和微观层面(裂纹,纤维-基体脱粘等)。为了确定钻井参数对分层面积的统计影响,采用了实验设计和方差分析技术。此外,还分析和讨论了在试件下方有或没有支撑的情况下钻孔的影响。结果表明,螺旋钻的剥脱分层程度与进给速度和螺旋角有关。下推分层主要受进给速率、试样下方是否存在支撑以及麻花钻温度的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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