Dynamic compressive properties of 3D orthogonal woven composites
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摘要: 本文作者利用分离式Hopkinson压杆装置对玻璃纤维三维正交机织复合材料进行了高应变率下面外、面内方向的压缩试验,并在万能试验机下进行了相应的准静态压缩。获得3 个高应变率及准静态下的应力-应变曲线,观察了试样的破坏形貌。结果表明:玻纤三维正交机织复合材料是应变率敏感材料,最大应力、压缩模量随着应变率的增大而增大。三维正交结构使复合材料体现出各向异性:面外的最大应力、失效应变比面内大;面内的压缩模量大于面外,且压缩模量对于应变率的变化比面外方向敏感;经纬向相比,纬向的最大应力大于经向。Abstract: The high strain rate compressive properties of 3D orthogonal glass fiber woven composite were tested in through-thickness and in-plane directions by a Split Hopkinson Pressure Bar (SHPB). And the relevant quasi-static compressions were carried out in the material universal testing machine. The stress-strain plots at 3 high strain rates and quasi-static were obtained,and the fractures of the samples were observed. The results indicate that the 3D orthogonal woven composite is strain rate sensitive material:its peak stress and compression modulus increase with the increase of strain rate. The 3D orthogonal woven structure makes the composite show anisotropy:the values of peak stress and failure strain in the out-of-plane direction are higher,but its compression modulus reaches a higher value,and tends to be more sensitive to the change of strain rate in the in-plane direction. Comparing the performances in the warp and weft directions reveals that the composite has higher peak stress in the weft direction.
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Key words:
- 3D orthogonal woven /
- composite /
- high strain rate /
- compression /
- anisot ropy
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