缝合复合材料层板的面内拉伸强度预报  

Prediction of In-plane Tensile Strength of Stitched Laminates

作　　者：李晨[1] 许希武[1] 

机构地区：[1]南京航空航天大学结构强度研究所,江苏南京210016

出　　处：《材料科学与工程学报》2005年第6期814-817,821,共5页Journal of Materials Science and Engineering

摘　　要：建立了缝合复合材料层板的面内拉伸强度模型,该模型考虑了缝合线对缝合层板拉伸强度的影响,将缝合线等效为椭圆形夹杂,应用含椭圆形夹杂的杂交应力单元建立了该模型的细节应力分析方法,通过引入特征长度的概念,采用点应力准则和最大应力判据实现了缝合层板的拉伸强度预报。试验数据和预报结果吻合较好,证明了该模型的有效性。同时系统讨论缝合参数对拉伸强度的影响规律,得到了一些重要结论。A model for predicting tensile strength of stitched laminates is presented. The stitch yarns were simplified as elliptic inclusions. A special finite element including an elliptic inclusion was applied to analyze the stress distribution. The tensile strength was predicted on the base of characteristic length and the point stress criteria and maximum stress theory. There is a good agreement between computational and experimental results. The effects of stitching parameters on tensile strength are discussed. Some useful conclusions are made.

关 键 词：缝合层板 面内拉伸强度 椭圆夹杂 缝合参数 

分 类 号：TB332[一般工业技术—材料科学与工程]