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Delamination in drilling GFR-thermoset composites

机译：钻孔GFR-热固性复合材料的分层

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Delamination is a major problem associated with drilling fiber-reinforced composite materials that, in addition to reducing the structural integrity of the material, also results in poor assembly tolerance and has the potential for long-term performance deterioration. Delamination-free in drilling different fiber reinforced thermoset composites is the main objective of the present paper. Therefore the influence of drilling and material variables on thrust force, torque and delamination of GFRP composites was investigated experimentally. Drilling variables are cutting speed and feed. Material variable include matrix type, filler and fiber shape. Drilling process was carried out on cross-winding/polyester, continuous-winding with filler/polyester, chopped/polyester, woven/ polyester and woven/epoxy composites. A simple inexpensive accurate technique was developed to measure delamination size. The results show that the presence of sand filler in continuous-winding composites not only raised the values of cutting forces and push-out delamination but also increased their values with increasing cutting speed. In contrast, increasing the cutting speed in drilling cross-winding, woven and chopped composites reduces the push-out delamination as a result of decreasing the thrust force. The thrust forces in drilling continuous-winding composite are more than three orders of magnitude higher than those in the cross-winding composites. Chopped composites have lower push-out delamination than those made from woven fibers. For the same fiber shape, the peel-up and push-out delaminations of woven/epoxy composite are lower than that for woven/polyester composites. Delamination, chipping and spalling damage mechanisms were observed in drilling chopped and continuous-winding composites. In drilling woven composites the delamination was observed at different edge position angles due to the presence of the braids that made by the interlacing of two orthogonal directions of fibers tows (warp and fill). Delamination-free in drilling cross-winding composites was achieved using variable feed technique.
机译：分层是与纤维增强复合材料钻孔相关的主要问题，除了降低材料的结构完整性外，还会导致组装公差差，并可能导致长期性能下降。本文的主要目的是在钻削不同的纤维增强热固性复合材料时实现无分层。因此，实验研究了钻削和材料变量对GFRP复合材料的推力，扭矩和分层的影响。钻削变量是切削速度和进给。材料变量包括基体类型，填料和纤维形状。在交叉卷绕/聚酯，与填料/聚酯，短切/聚酯，机织/聚酯和机织/环氧树脂复合材料连续卷绕的情况下进行钻孔。开发了一种简单的廉价精确技术来测量分层大小。结果表明，连续缠绕复合材料中存在的沙填料不仅提高了切削力和顶出分层的值，而且随着切削速度的提高而增加了其值。相反，在钻取交叉缠绕，机织和切碎的复合材料时，提高切割速度会降低推力，从而减少推出分层。钻连续绕组复合材料中的推力比交叉绕组复合材料中的推力高三个数量级。切碎的复合材料比由编织纤维制成的复合材料具有更低的推出分层。对于相同的纤维形状，编织/环氧树脂复合材料的剥离和推出分层低于编织/聚酯复合材料的剥离和推出分层。在切碎和连续缠绕的复合材料中观察到分层，碎裂和剥落损坏机理。在钻孔编织复合材料中，由于存在由纤维束的两个正交方向（经纱和纬纱）交织而成的编织物，因此在不同的边缘位置角度观察到了分层。使用可变进给技术可在钻取交叉缠绕复合材料时实现无分层。

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