Umarfarooq Maktedar Abdulkhadar, Patil Somalingana Shivakumar Gouda, A. Shirahatti, G. Kumar, N. Banapurmath
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引用次数: 1
Abstract
The energy release rate for delamination in a laminated composite is supposed to be the material property being considered as independent of non-material property variables. However, Mode I fracture toughness (GI) is found to vary with lamina arrangement, geometrical dimensions, and process-induced stresses. In this investigation, the influence of lamina stacking arrangement on process-induced stresses and their effects on GI of laminated composites are studied. Unidirectional (UD) ([0]16) and cross-ply ([902/06]s, [904/04]s, and [906/02]s) glass/ epoxy (GE) composites with the delamination plane at 0◦//0◦ were prepared by manual layup method and post-cured at 120°C for 4 hours. GI of composite laminates were experimentally determined using a double cantilever beam (DCB) specimen as per ASTM D 5528. The slitting method was applied to determine the process-induced stresses in GE laminates. The stacking sequence of laminas was found to have a noticeable effect on the state of residual stresses and GI of GE laminates. Residual stresses do not have much influence on the GI for delamination initiation, whereas GI for the crack propagation was found to increase with a gradual increase in compressive residual stresses
层压复合材料中分层的能量释放率被认为是与非材料性质变量无关的材料性质。然而,发现I型断裂韧性(GI)随薄板排列、几何尺寸和工艺诱导应力而变化。在本研究中,研究了叠层排列对层合复合材料过程诱导应力的影响及其对GI的影响。单向(UD)([0]16)和交叉层([902/06]s、[904/04]s和[906/02]s)玻璃/环氧树脂(GE)复合材料,分层平面为0◦//0◦ 通过手动铺层法制备,并在120°C下后固化4小时。根据ASTM D 5528,使用双悬臂梁(DCB)试样对复合材料层压板的GI进行实验测定。采用分切法测定了GE层压板的工艺应力。发现层压板的堆叠顺序对GE层压板的残余应力和GI状态有显著影响。残余应力对分层起始的GI没有太大影响,而发现裂纹扩展的GI随着压缩残余应力的逐渐增加而增加