玻璃纤维毡增强复合材料的低周拉伸疲劳性能研究

玻璃钢/复合材料 ›› 2016, Vol. 0 ›› Issue (5): 41-47.

玻璃纤维毡增强复合材料的低周拉伸疲劳性能研究

赵德方¹,阳玉球^1,2*,张志远³,滨田泰以³

1.东华大学纺织学院,上海201620;
2.东华大学产业用纺织品教育部工程研究中心,上海201620;
3.京都工艺纤维大学先端纤维科学专攻,京都6068799

收稿日期:2015-10-21 出版日期:2016-05-25 发布日期:2016-05-25
通讯作者: 阳玉球(1976-),女,副教授,博士,主要从事纤维增强复合材料机械性能的研究。
作者简介:赵德方(1987-),男,硕士研究生,主要从事玻璃纤维增强复合材料力学性能研究。

INVESTIGATION ON LOW CYCLE TENSILE FATIGUE PROPERTIESOF GLASS FIBER MAT REINFORCED COMPOSITES

ZHAO De-fang¹, YANG Yu-qiu^{1, 2*}, ZHANG Zhi-yuan³, Hiroyuki Hamada³

1.College of Textile, Donghua University, Shanghai 201620, China;
2.Engineering Research Center of Technical Textiles, Ministry of Education, Shanghai 201620, China;
3.Department of Advanced Fibro-Science, Kyoto Institute of Technology, Kyoto 6068799, Japan

Received:2015-10-21 Online:2016-05-25 Published:2016-05-25

摘要/Abstract

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。

关键词: 玻璃纤维毡增强复合材料, 拉伸性能, 低周疲劳, 断裂区域, 特征长度

Abstract: In this paper, glass fiber mat and unsaturated polyester were used to fabricate composite through hand lay-up method. The tensile properties of unnotched and open-hole notched glass fiber mat reinforced composites (GMC) specimens were examined based on the normal and low cycle fatigue (LCF) tensile tests. It was found that both the unnotched strength and notched strength were promoted with increasing volume fraction (V_f). In LCF test, for unnotched and notched specimens, the properties of GMC showed stable in 30 cycles under 55% of max load but degraded much under the cycle load more than 70% of max load. In the investigation on the fracture behavior of specimens, delamination was found in the fracture section of unnotched test specimens. While for notched specimens, two different fracture areas defined as parallel area and fan shape area were found. The values of characteristic distance were calculated by finite element analysis software (MSC-Marc). Furthermore, the characteristic distance was found. It is close to the length of parallel area, decreasing with the increase of the load level in LCF tests, reducing the resistance of GMC to the effect from an open hole. Finally, SEM observation was carried out on the selected specimens to compare the difference between the ones before and after LCF test.

Key words: GMC, tensile properties, low cycle fatigue (LCF), fracture areas, characteristic distance

中图分类号:

TB332

赵德方,阳玉球,张志远,滨田泰以. 玻璃纤维毡增强复合材料的低周拉伸疲劳性能研究[J]. 玻璃钢/复合材料, 2016, 0(5): 41-47.

ZHAO De-fang, YANG Yu-qiu, ZHANG Zhi-yuan, Hiroyuki Hamada. INVESTIGATION ON LOW CYCLE TENSILE FATIGUE PROPERTIESOF GLASS FIBER MAT REINFORCED COMPOSITES[J]. Fiber Reinforced Plastics/Composites, 2016, 0(5): 41-47.

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