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介绍了玻璃纤维增强复合材料Ⅰ型层间断裂韧性“RoundRobinTest”的结果随着偶联剂浓度的改变，Ⅰ型裂纹的扩展方式从稳态向非稳态转变这类断裂韧性强烈地依赖界面性能关键词##4界面性能;;Ⅰ型断裂韧性;;裂纹扩展;;稳态;;非稳态
The results of “RoundRobinTest”, an interlaminar fracture toughness of glass fiber reinforced composites, are introduced. With the change of concentration of coupling agent, the mode of crack propagation changes from steady state to unsteady state. The fracture toughness is strongly dependent on the interfacial properties Key words ## 4 interface properties; type Ⅰ fracture toughness; crack propagation; steady state; unsteady state