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Study on Fatigue Fracture Mechanism of Short Glass Fiber Reinforced Plastic

短玻璃纤维增强塑料疲劳断裂机理研究

基本信息

批准号：
13650744
负责人：
KURIYAMA Takashi
金额：
$ 2.18万
依托单位：
Faculty of Engineering Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The fatigue properties of short glass-fiber reinforced polyphenyleneether (GFPPE), polyphenylenesulfide (GFPPS), syndiotactic polystyrene (GFSPS), and glass-bead reinforced polyoxymethylene (GBPOM) were studied through uni-axial and multi-axial fatigue tests. It was found that the numbers of cycles to failure were strongly dependent on the duration of the interval time. In the case of uni-axial fatigue tests, the interval time resulted in greater numbers of cycles to failure. In multi-axial fatigue tests, however, the interval time resulted in smaller numbers of cycles to crack initiation and ultimate failure. The failure mechanism was investigated through acoustic velocity measurements and optical microscope (OM) observations. The results of those measurements suggested that the different behaviors in fatigue tests under different conditions are attributable to the differences in mechanisms of damage zone development, which consisted with breakage of glass fibers, micro-voiding, changes in the orientation of glass fibers, and plastic deformation of matrix depending on the test conditions such as loading mode (uni-axial and multi-axial) and interval times between loading. Experimental results suggested that the difference in the damage development mechanisms were caused by the different elastic response to the loading resulting in the localized or delocalized damage accumulation depending on the loading mode and interval time. The different damage development mechanisms, in turn, affect the absorption of loading energy resulting in the different fatigue life

通过单轴和多轴疲劳试验，研究了短玻璃纤维增强聚苯醚(GFPPE)、聚苯硫醚(GFPPS)、间规聚苯乙烯(GFSPS)和玻璃微珠增强聚甲醛(GBPOM)的疲劳性能。研究发现，到失效的循环次数强烈依赖于间隔时间的持续时间。在单轴疲劳试验的情况下，间隔时间导致更多的循环到失效。然而，在多轴疲劳试验中，间隔时间导致裂纹萌生和最终失效的循环次数较少。通过声速测量和光学显微镜(OM)观察对失效机理进行了研究。结果表明，不同加载方式(单轴和多轴)和加载间隔时间的不同，导致不同条件下疲劳试验表现出不同的损伤区域发展机制，包括玻璃纤维的断裂、微孔洞、玻璃纤维取向的变化和基体的塑性变形。实验结果表明，损伤发展机制的不同是由于加载方式和间隔时间不同，弹性响应不同，导致损伤的局部化或离域化累积。不同的损伤发展机制反过来影响加载能量的吸收，从而导致不同的疲劳寿命。