A simple method for determining mode Ⅰ interlaminar fracture toughness of composite at low temperature
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摘要: 目前ASTM复合材料Ⅰ型层间断裂韧性测试标准需不断观测裂纹扩展长度。然而在低温环境下,裂纹扩展长度不易测量且过程繁琐。为克服这一缺陷,本文采用双柔度法测试复合材料低温环境下Ⅰ型层间断裂韧性,该方法的步骤与ASTM标准基本相同,但不需观测裂纹扩展长度便能获得低温下Ⅰ型层间断裂韧性。为了验证该方法的可靠性和精度,采用5件碳纤维增强环氧树脂基复合材料双悬臂梁(DCB)试样在-10℃环境下进行Ⅰ型层间裂纹扩展实验,应用ASTM标准所推荐的三种方法及本文的双柔度法进行数据处理获得复合材料Ⅰ型层间断裂韧性。结果表明:ASTM标准的三种方法与双柔度法得到的Ⅰ型层间断裂韧性结果一致,相对差别小于5%,而本文的双柔度法不需测量裂纹扩展长度,因此更简单,为测试低温环境下Ⅰ型层间断裂韧性提供了一种准确、简单的新方法。Abstract: The current ASTM standard for measuring the mode Ⅰ interlaminar fracture toughness of composite requires to measure the crack growth length, which is a very tedious and difficult process for measuring the interlaminar fracture toughness in low temperature environment. To overcome the limitation of measuring the crack growth length, a double compliances method was used to measure the mode Ⅰ interlaminar fracture toughness. The process of this method was nearly the same as that recommended in the ASTM, except avoiding measuring the crack growth length. To verify the accuracy of this method, five double cantilever beam (DCB) specimens made of carbon fiber reinforced epoxy composites were tested at -10℃ environment. The fracture toughness were determined by using the methods recommended by the ASTM standard and the present double compliances method. The result shows that the relative difference of the fracture toughness obtained from the ASTM methods and the double compliances method is within 5%. Therefore, the present paper provides a simple and reliable method for determining the mode Ⅰ interlaminar fracture toughness of composite in the low temperature environment.
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