Mixed-Mode Failure Analysis of a Unidirectional Carbon/EpoxyComposite and Ahesively Bonded Composite Systems Using the Modified Losipescu Test Method

研究将进行调查混合模式断裂 单向碳/环氧复合材料的机理 使用改良的约西佩斯库测试技术。 椎板内骨折 复合材料中的机制将进行数值分析， 实验性的 研究将采用有限元方法 广泛研究混合型应力强度因子， 能量释放率与板内裂纹在 双轴应力下的复合材料Iosipescu试件 条件 此外，粘结复合材料系统将 在混合模式荷载条件下使用新的 设计的Iosipescu夹具。 线性和非线性有限元 Iosipescu样本中的粘合接头的计算将 被执行。 这项研究的根本意义在于， 有助于了解椎板内骨折机制 在碳纤维/环氧复合材料中由双向应力引起的 条件 此外，这项研究将为研究提供新的见解。 先进的粘接系统的复杂失效现象。 的 实际意义是，在综合数值和 新型双轴试验机的试验研究 技术，测试将有很大的潜力成为标准 对于许多先进的混合模式失效和断裂分析 复合系统

Research will be conducted to investigate mixed mode fracture mechanisms of a unidirectional carbon/epoxy composite material using the modified Iosipescu test technique. Intralaminar fracture mechanisms in the composite will be analyzed numerically and experimentally. The research will use finite element methods extensively to study the mixed mode stress intensity factors and the energy release rates associated with intralaminar cracks in the composite Iosipescu specimens tested under biaxial stress conditions. In addition, adhesively bonded composite systems will be tested under mixed mode loading conditions using the newly designed Iosipescu fixture. Linear and non-linear finite element calculations of the adhesive joints in the Iosipescu specimens will be performed. The fundamental significance of this research is that it will contribute to the understanding of intralaminar fracture mechanisms in carbon fibre/epoxy composites caused by biaxial stress conditions. Moreover, the study will provide new insights into the complex failure phenomena of advanced adhesive joint systems. The practical significance is that after comprehensive numerical and experimental investigations of the newly designed biaxial test technique, the test will have great potential to become standard for mixed mode failure and fracture analysis of many advanced composite systems.