单向复合材料横向裂纹黏弹性损伤演化模型  

A damage evolution law for transverse cracking in unidirectional composites of linear viscoelastic behavior

作　　者：许飞[1] 李磊[1] 杨胜春[2] XU Fei;LI Lei;YANG Shengchun(The Thirteenth Research Department,Aircraft Strength Research Institute,Xi’an 710065,China;Science&Technology Committee,Aircraft Strength Research Institute,Xi’an 710065,China)

机构地区：[1]中国飞机强度研究所第十三研究室,西安710065 [2]中国飞机强度研究所科技委,西安710065

出　　处：《复合材料学报》2020年第6期1344-1351,共8页Acta Materiae Compositae Sinica

摘　　要：建立一个考虑基体黏弹性的纤维增强聚合物单向复合材料在产生横向裂纹时的损伤演化模型,有效地预测了单向复合材料横向拉伸行为。假设呈现威布尔分布的缺陷会在变形的驱动下演化为损伤,并以此为基础建立了单向复合材料横向损伤演化模型。通过此模型,时间-温度叠加原理(TTSP)得到了更具有物理基础的解释。最后,通过具体例子阐述了此模型的应用,并通过试验对模型预测结果进行了验证。本模型有效地预测了单向复合材料横向拉伸行为。由于单向复合材料横向性能存在脆性,此模型还无法准确预测失效和强度。A damage evolution law for linear viscoelastic unidirectional(UD)composites undergoing transverse matrix cracking has been proposed.Based on this model,the transverse tensile properties of the UD composites were predicted precisely.The damage evolution law was constructed using the Weibull distribution of defects which will develop into cracks as a result of deformation.The time-temperature superposition principle(TTSP)approach has been interpreted with physical basis through this damage evolution law.The whole process of using this damage model to predict the properties of a UD composite during deformation was demonstrated in this paper through an example of its application,and the results have been compared with experimental data.The transverse tensile behavior of UD composite can be predicted precisely by this model.In terms of failure and strength prediction,a noticeable discrepancy is present due to the brittleness of the transverse direction of UD composite.

关 键 词：损伤 线性黏弹性 一致性准则 横向基体裂纹 威布尔分布 时间-温度叠加原理(TTSP) 

分 类 号：O346.5[理学—固体力学]