The mixed mode I/II/III translaminar fracture of a natural fiber reinforced composites system was investigated in this paper. The specimens were made of epoxy resin and fabric cotton fibers. Compact shear tension (CTS) test configuration was utilized to determine a full range of mixed mode I/II/III translaminar critical strain energy release rate (CSERR). The CTS specimens were loaded by a novel test setup. In addition to pure modes I, II and III CSERR of cotton/epoxy system, a full series of mixed mode tests were conducted. Finite element analysis was also carried out to calculate the calibration factors related to the CSERR formulations. The pure mode I, II and III CSERR of cotton/epoxy laminates were obtained as 48.1, 57.8 and 1528.5 kJ/m², respectively. The investigation confirms that the translaminar CSERR of cotton/epoxy laminated composites is considerable as compared to the mode I translaminar CSERR of artificial fiber reinforced epoxy systems. Hence, due to this property and some other advantages such as biodegradability, biocompatibility and sustainability of the cotton/epoxy fiber laminated composites material can be a strong candidate to use in the place of different types of wood and synthesis fiber reinforced laminates.

本文研究了天然纤维增强复合材料系统的混合模式I / II / III跨层断裂。标本由环氧树脂和织物棉纤维制成。紧凑剪切张力（CTS）测试配置用于确定混合模式I / II / III跨层临界应变能释放速率（CSERR）的整个范围。通过新颖的测试装置加载CTS标本。除了棉/环氧树脂系统的纯模式I，II和III CSERR，还进行了全系列的混合模式测试。还进行了有限元分析以计算与CSERR配方有关的校准因子。棉/环氧树脂层压板的纯模式I，II和III CSERR为48.1、57.8和1528.5 kJ / m ²， 分别。研究证实，与人造纤维增强的环氧体系的I型层间CSERR相比，棉/环氧层压复合材料的层间CSERR相当大。因此，由于该特性和棉/环氧树脂纤维层压复合材料的一些其他优点，例如生物降解性，生物相容性和可持续性，可以替代各种类型的木材和合成纤维增强层压板。