含孔复合材料层合板孔口缝合补强的层间应力分析

使用有限元模拟计算了含孔复合材料层合板开口缝合补强结构。研究了含孔复合材料层合板在轴向拉伸载荷作用下孔边各个铺层的层间应力分布情况,并将缝合后的层间应力值与缝合前的相关数值进行了比较,主要研究了不同缝合参数对孔边层间应力的影响。通过有限元模拟计算可得,层合板缝合补强后,孔边的层间应力比未缝合前显著减小,孔边附近层间应力的分布与相邻铺层的铺层角有关,不同铺层之间的层间应力沿孔边区域存在应力的转换点,并且存在显著差别。

The analysis of the interlaminar stresses of composite laminates with a circular hole

The stitching yarns are described by the space bar element in this paper, and a finite element modeling techniques are evaluated for the interlaminar stresses analysis of the composite laminates stitched around a circular hole. The interlaminar normal stress and the interlaminar shear stress are computed around the hole which subjected to in-plane tension. The interlaminar stresses of stitched-composites laminate are compared with those of unstitched-composites laminate. The effects of stitching parameters are discussed on the interlaminar stresses. The results show that the stitched-composites laminate have much lower interlaminar stresses than unstitched-composites laminate. The distribution of the interlaminar stresses around the hole is related with layers. The interlaminar stresses around the hole of different layers are likely to including breaking point.