玻璃纤维毡增强复合材料的低周拉伸疲劳性能研究

发布时间：2018-04-11 10:41

本文选题：玻璃纤维毡增强复合材料 + 拉伸性能　；参考：《玻璃钢/复合材料》2016年05期

【摘要】：采用玻璃纤维毡和不饱和树脂使用手糊成型的方法制作复合材料,并进行拉伸测试和低周疲劳测试来研究无孔和开孔玻璃纤维毡复合材料的拉伸性能。结果表明,试样的拉伸强度都随着纤维体积含量的增加而增加。在低周疲劳测试中,无孔和开孔试样的拉伸性能在55%载荷水平的低周疲劳作用下基本保持不变,但是在70%以上载荷水平的低周疲劳作用下发生了显著下降。对试样的断裂行为进行了研究,无孔试样拉伸断裂后有分层现象,开孔试样的断裂区域可以分为两个部分,分别为平行区域和扇形区域。特征长度通过使用有限元软件(MSC-Marc)计算出来,和测量出来的平行区域长度很接近,并且随着施加疲劳载荷水平的提高而降低,材料对孔洞的抵抗性降低。最后,对低周疲劳前后的破坏试样进行了扫描电镜观察以比较两者的不同。
[Abstract]:Glass fiber felt and unsaturated resin were used to make composites by hand paste molding. Tensile tests and low cycle fatigue tests were carried out to study the tensile properties of glass fiber felt composites without pores and openings.The results show that the tensile strength increases with the increase of fiber volume content.In the low cycle fatigue test, the tensile properties of pore-free and open-hole specimens remained basically unchanged under the low cycle fatigue of 55% load level, but decreased significantly under the low cycle fatigue action of more than 70% load level.The fracture behavior of the specimen was studied. The fracture zone of the porous specimen can be divided into two parts, parallel region and sector region, after tensile fracture.The characteristic length is calculated by using the finite element software MSC-Marc, which is very close to the measured parallel region length, and decreases with the increase of fatigue load level, and the resistance of the material to the pore decreases.Finally, the fracture specimens before and after low cycle fatigue were observed by SEM to compare their differences.
【作者单位】：东华大学纺织学院;东华大学产业用纺织品教育部工程研究中心;京都工艺纤维大学;
【分类号】：TB332

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