| 引用本文: | 李丽英,孟松鹤,王国勇,张涛,许承海,柯红军.非屈曲织物增强复合材料双轴压缩力学行为[J].哈尔滨工业大学学报,2015,47(10):20.DOI:10.11918/j.issn.0367-6234.2015.10.005 |
| LI Liying,MENG Songhe,WANG Guoyong,ZHANG Tao,XU Chenghai,KE Hongjun.Mechanical behaviors of the composites reinforced by non-crimp unidirectional carbon fiber fabrics under biaxial compression loading[J].Journal of Harbin Institute of Technology,2015,47(10):20.DOI:10.11918/j.issn.0367-6234.2015.10.005 |
|
| 摘要: |
| 在实际工程应用中,复合材料与构件往往处于复杂的应力状态,开展近似真实载荷环境下的力学实验分析,能够更准确地认识实际应用中材料的真实承载能力和失效机理.基于非屈曲单向碳纤维织物复合材料层合板的细观结构特征,设计了双轴压缩试样,开展了材料单轴、双轴压缩试验研究,对比分析了单向织物复合材料在不同压缩载荷下的力学行为.研究结果表明：非屈曲单向织物复合材料的单轴压缩行为表现为线性、脆性断裂；破坏模式整体表现为剪切屈曲破坏,与单轴压缩相比,双轴压缩载荷作用下材料整体表现为线性、脆性断裂,但其应力-应变曲线表现出一定的非线性特征；双轴1∶1等比例压缩对材料抵抗变形能力有一定强化效应,材料压缩模量增加；双轴2∶1非等比例压缩的结果与之相反,材料压缩模量大幅降低；双轴压缩强度均低于其单轴压缩强度；破坏模式主要表现为分层、基体开裂和纤维断裂,其中以分层现象尤为明显. |
| 关键词: 非屈曲单向碳纤维织物 复合材料 双轴压缩 力学行为 破坏机制 |
| DOI：10.11918/j.issn.0367-6234.2015.10.005 |
| 分类号:TB332 |
| 基金项目:国家重点基础研究发展计划 (2010CB631100); 国家自然科学基金(91216301). |
|
| Mechanical behaviors of the composites reinforced by non-crimp unidirectional carbon fiber fabrics under biaxial compression loading |
|
LI Liying1,2, MENG Songhe1, WANG Guoyong2, ZHANG Tao2, XU Chenghai1,KE Hongjun2
|
|
（1.Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China; 2.Aerospace Research Institute of Materials & Processing Technology,100074 Beijing,China）
|
| Abstract: |
| Composite structures in service are usually subject to complex loading conditions that can induce a stress field with two or even three dynamic principal stresses. The experimental analysis of composite structures could approximate the real loading condition to produce a multiaxial stress field for validating the load carrying capability. Based on the microstructure of the composite laminates reinforced by non-crimp unidirectional carbon fiber fabrics, specimen of biaxial compression was designed and followed by the testing under uniaxial and biaxial compression as well. Comparative analysis was also carried out for the mechanical behavior of the composites reinforced by unidirectional carbon fiber fabrics under different compression loads. The results show that the composites performs linear compression behavior and brittle fracture, and the failure mechanism of composite is overall represented as shear buckling under uniaxial compression. Compared with uniaxial compression, although the composites still performed linear compression behavior and brittle fracture under biaxial compression, its stress-strain curves showed some nonlinear characteristics. The strength of composites under biaxial compression was much lower than that of the uniaxial compression results. Resistance to deformation of the composite was enhanced when the biaxial compression loading was kept at 1∶1, resulting in the increasing of the compression modulus. The result was opposite while the biaxial compression loading was kept at 2∶1. The failure mechanism of the composite was basically the same when the biaxial compression loads were kept at 1∶1 and 2∶1, mainly as matrix cracking, fiber breakage and interlaminar debonding. Especially, the phenomenon of interlaminar debonding was obvious. |
| Key words: non-crimp unidirectional carbon fiber fabrics composite biaxial compression mechanical behavior failure mechanism |
