摘要
利用置换法三维织物非织造技术结合树脂传递模塑(RTM)工艺,制备了碳/环氧面内准各向三维复合材料和三维正交复合材料.采用岛津万能材料试验机和分离式霍普金森压杆(SHPB)测试系统,对复合材料进行了面内和厚度方向的准静态及动态压缩性能试验,研究了碳/环氧面内准各向三维复合材料不同应变率下的压缩应力-应变关系以及破坏模式.对比分析结果表明:无论面内还是厚度方向,碳/环氧面内准各向三维复合材料的压缩性能都是应变率敏感的,并且其破坏应力和应变的应变率敏感程度大于三维正交复合材料;在面内和厚度方向准静态压缩载荷作用下,面内±45°纱线有效地抑制了面内准各向三维复合材料剪切带的形成和扩展,使得脆性破坏形貌更加均匀;随着应变率增加,面内准各向三维复合材料面内方向以剪切破坏为主,断口比三维正交复合材料粗糙,厚度方向二者破坏模式相同.
Carbon/epoxy quasi-isotropic in-plane 3D composites and 3D orthogonal composites were made by non-wovenmanufacture technique for 3D fabric and resin transfer molding （RTM）process. The in -plane and through -thickness compression properties at different strain rates of carbon/epoxy quasi-isotropic in-plane 3D compositesand 3D orthogonal composites were tested using SHIMADZU universal material testing machine and SHPBmeasurement system. The compression stress -strain relationships, failure modes under quasi -static and highstrain rates were investigated. The results show that the compression performance of carbon/epoxy quasi-isotropicin -plane 3D composites is strain rate dependent in the directions of in -plane and through -thickness. Thecompression properties of the composites are more strain-rate sensitive than those of 3D orthogonal composites.Under quasi-static loading, the production and spread of shear bonds are restrained by ±45° fibers in quasiisotropicin-plane 3D composites and the brittle failure mode is more uniform. With the increase of strain rate,the failure modes of the composites are shear in the in-plane direction and the fracture is more rough than 3Dorthogonal composites, the failure modes of the two composites are the same in the through-thickness direction.
出处
《天津工业大学学报》
CAS
北大核心
2015年第2期6-10,15,共6页
Journal of Tiangong University
基金
国家自然科学基金青年基金资助项目(11102133)
关键词
碳/环氧复合材料
面内准各向
三维正交
应变率效应
动态压缩
carbon/epoxy composites
quasi-isotropic in-plane
3D orthogonal
strain rate effect
dynamic compression
