Time-space damage analysis of the short fiber reinforced thermoplastics during creep and fatigue loading

短纤维增强热塑性塑料在蠕变和疲劳载荷过程中的时空损伤分析

• 批准号: 16360335
• 负责人: KURIYAMA Takashi
• 金额: $ 8.13万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360335/
• 关键词: Fatigue; Acoustic emission; Map of acoustic velocity; Fiber brakeage; Matrix crakes; 複合材料; 樹脂破壊; 線形加算則; クリープ; 結晶化度; ポリアミド

The ability to effectively design and manufacture plastics for engineering applications requires a large body of knowledge on long-term performance of the materials. The fatigue life is a typical long-term property that should be characterized in components and structures where cyclic loads are experienced. There has been considerable research into the basic mechanism that cause fatigue of plastics, but still there is not a clear understanding of the mechanism in many plastics. In this study, the mechanism of the fatigue fracture of glass fiber reinforced nylon66 has been identified using acoustic emission (AE), ultrasonic measurement and optical microscopy (OM) techniques. The acoustic velocity of the edge of specimens decreased by the cyclic loading. This behavior was correlated to matrix cracks and fiber breakages at the edge of the specimens.

有效设计和制造工程应用塑料的能力需要大量关于材料长期性能的知识。疲劳寿命是一个典型的长期性能，应在经历循环载荷的部件和结构中进行表征。对塑料疲劳的基本机理已经有了相当多的研究，但对许多塑料的疲劳机理仍然没有一个清楚的认识。本文采用声发射、超声波测量和光学显微镜等技术对玻璃纤维增强尼龙66的疲劳断裂机理进行了研究。循环加载使试件边缘的声速降低。这种行为与试样边缘的基体裂纹和纤维断裂有关。