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

Abstract

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

CLC Number:

TB332

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.

References

[1] 张以河. 复合材料学[M]. 北京: 化学工业出版社,2011:12-67.
[2] 李洪峰, 王德志, 曲春艳, 等. 核壳橡胶增韧环氧/玻璃纤维复合材料层压板性能的研究[J]. 玻璃钢/复合材料, 2014(06) : 25-29.
[3] 梅端, 王钧, 李君明, 等. 玻璃纤维增强树脂基复合材料拉-拉疲劳行为研究[J]. 玻璃钢/复合材料, 2013(02) : 39-42.
[4] 杨忠清, 吴富强, 廉伟, 等. 玻璃纤维增强树脂基复合材料疲劳性能的试验研究[J]. 玻璃纤维, 2008(05) : 19-23.
[5] Gren A, Sayman O. Experimental failure analysis of bolted joints in moisture-and temperature-induced composite laminates under preload[J]. Polymer Composites, 2010, 31(1): 173-178.
[6] Kaleemulla K M, Siddeswarappa B, Satish K G. Investigations to Model and Analyze the OHC Strength of Hybrid Composites[J]. Journal of Engineering Science and Technology Review, 2009, 2(1): 91-98.
[7] Wolfrath J, Michaud V, Mnson J A E. Graded glass mat-reinforced polypropylene[J]. Polymer composites, 2005, 26(3): 361-369.
[8] Tsotsis T K, Keller S, Bardis J, et al. Preliminary evaluation of the use of elevated pressure to accelerate thermo-oxidative aging in composites[J]. Polymer Degradation and Stability, 1999, 64(2): 207-212.
[9] Green B G, Wisnom M R, Hallett S R. An experimental investigation into the tensile strength scaling of notched composites[J]. Composites Part A: Applied Science and Manufacturing, 2007, 38(3): 867-878.
[10] Camanho P, Maimi P. Size effect on the strength of notched composites[C]. Koyto:16th international conference on composite materials, 2007: 85-91.
[11] Chang F K, Chang K Y. A progressive damage model for laminated composites containing stress concentrations[J]. Journal of Composite Materials, 1987, 21(9): 834-855.
[12] Lessard L B, Chang F K. Damage tolerance of laminated composites containing an open hole and subjected to compressive loading[J]. Journal of Composite Materials,1991, 25: 44-64.
[13] Chang K Y, Llu S, Chang F K. Damage tolerance of laminated composites containing an open hole and subjected to tensile loadings[J]. Journal of Composite Materials, 1991, 25(3): 274-301.
[14] Whitney J M, Nuismer R J. Stress fracture criteria for laminated composites containing stress concentrations[J]. Journal of composite materials, 1974, 8(3): 253-265.
[15] Zhang Z, Yang Y, Hamada H. Mechanical property of glass mat composite with open hole[C]. Houston: ASME 2012 International Mechanical Engineering Congress and Exposition, 2012:105-110.