| 戴云锋， 张典堂， 刘晓东， 赵军华， 孙琎.考虑偏轴角影响的2.5D机织复合材料冲击后压缩性能[J].轻工机械,2021,39(3):1-9 |
| 考虑偏轴角影响的2.5D机织复合材料冲击后压缩性能 |
| Off Axis Angle Effect on Compressive Properties of 2.5D Woven Composites after Impact |
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| DOI：10.3969/j.issn.1005 2895.2021.03.001 |
| 中文关键词: 机织复合材料 超声C扫描技术 偏轴角 力学响应 损伤机理 |
| 英文关键词:woven composites ultrasonic C scan technology off axis angle mechanical response damage mechanism |
| 基金项目:中国博士后科学基金（2019M661721）。 |
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| 摘要点击次数: 728 |
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| 中文摘要: |
| 2.5D机织复合材料作为一种各向异性材料，其冲击后压缩性能亦表现出显著的各向异性特征。为了探究偏轴角对2.5D机织复合材料冲击后剩余力学性能的影响，课题组进行了低速冲击和压缩试验，并借助超声C扫描技术等检测手段，对比了2.5D机织复合材料受不同能量冲击后沿0°及45°方向的压缩性能。对材料在冲击后压缩试验中的力学响应特征、失效模式和损伤机理进行了分析，研究了偏轴角对材料冲击后压缩性能的影响。结果表明：在受到低速冲击时，材料的损伤形式主要包括基体开裂、界面脱粘以及纤维断裂；在给定的2种冲击能量下，材料沿45°方向冲击后压缩强度均低于0°方向，而随着冲击能量的增加，0°试件的压缩强度下降更为明显，随着偏轴角度的增大，材料的力学响应由脆性变为韧性；其次2种角度试件发生冲击后压缩破坏的类型、位置及路径有所不同，0°试件在试件端部发生压溃，损伤沿试件横向分布，而45°试件在受冲击部位出现界面脱粘和基体开裂，主要沿±45°方向分布。该研究对于准确评价该材料在易受撞击环境中的服役效能具有重要的工程参考意义。 |
| 英文摘要: |
| 2.5D woven composites are an anisotropic material, and their compressive performance after impact also shows significant anisotropy. To investigate the effect of off axis angle on the residual mechanical properties of 2.5D woven composites after impact, by low velocity impact and compression tests and ultrasonic C scan technology, the compressive properties of 2.5D woven composite in the direction of 0° and 45° after impact under different energies were compared employing. The mechanical responses, failure modes and damage mechanism were analyzed, and the effects of off axis angle on the compression properties of the material after impact were studied. The results show that when subjected to low velocity impact, the damage forms of the material mainly include matrix cracking, interface debonding and fiber breakage. Under two given impact energies, the compressive strengths of the material in the 45° direction are lower than those in the 0° direction, and as the impact energy increases, the compressive strength of the 0° specimen decreases more obviously. With the increase of off axis angle, the mechanical response of the material changes from brittleness to ductility. Secondly, the types, locations and paths of compressive failure after impact of the two off axis angle specimens are different. The 0° specimen is crushed at the end of the specimen and the damage is distributed along the transverse direction of the specimen, while the 45° specimen appears interface debonding and matrix cracking at the impacted region, mainly along the ±45° directions. It has great engineering significance for accurately evaluating the service performance of the materials in the impact prone environment. |
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