Micro Mechanical Study on Fatigue Damage Mechanism of Composite Materials

复合材料疲劳损伤机理的微观力学研究

• 批准号: 03452192
• 负责人: KIMPARA Isao
• 金额: $ 4.29万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452192/
• 关键词: Composite Materials; Carbon Fibers; Polymer Materials; Fracture; Fatigue; Delamination; Ultrasonic C-Scan; Acoustic Emission; 疲労損傷機構; 層内樹脂割れ; 剛性低下; AE; 微視力学的モデル; 疲労損傷桟構

Computer aided testing system was developed for measuring damage accumulation of composite laminates under cyclic load. Stiffness reduction and energy assumption in the stress versus strain diagram are monitored as a function of cycle numbers. A master curve of stiffness degradation of fatigue damage is obtained for glass, carbon, aramid and their hybrid fibers reinforced plastic. Hybrid effect and design criteria were discussed.Static and fatigue tests were carried out for unidirectional, cross plied and quasi-isotropic carbonepoxy composite laminates, and their S-N diagrams and stiffness degradation curves were discussed with special consideration on propagation behavior of delamination and matrix cracks.A model of delamination growth model under cyclic load based on the fracture mechanics approach. Stress and strain concentration at delamination was measured by energy release rate. Effect of elastic moduli on fatigue strength was well explained by the model based on the energy release rate. In order to measure the accurate behavior of fatigue delamination growth, end notched flexur (ENF) test was carried out under constant crack shear displacement rate. A power raw relation between mode II energy release rate and delamination growth rate was obtained.

开发了复合材料层合板在循环载荷作用下损伤累积的计算机辅助测试系统。应力应变图中的刚度降低和能量假设作为循环次数的函数进行监测。得到了玻璃纤维、碳纤维、芳纶纤维及其混杂纤维增强塑料的疲劳损伤刚度退化主曲线。讨论了混杂效应和设计准则，对单向、正交铺层和准各向同性碳/环氧复合材料层合板进行了静态和疲劳试验，讨论了它们的S-N图和刚度退化曲线，并特别考虑了分层和基体裂纹的扩展行为，基于断裂力学方法建立了循环载荷下分层扩展模型。用能量释放率测量了分层时的应力应变集中。基于能量释放率的模型较好地解释了弹性模量对疲劳强度的影响。为了准确测量疲劳脱层扩展行为，在恒定裂纹剪切位移速率下进行了端部缺口挠曲（ENF）试验。得到了Ⅱ型能量释放率与分层扩展速率之间的幂函数关系。

项目成果

I.Kimpara et al.: "Fatigue Properties of Multidirectional Laminates Using Pitch -based Carbon Fiber" Proc.3rd Japan Intern.SAMPE Sympos.Vol.1. 445-450 (1993)

I.Kimpara 等人：“使用沥青基碳纤维的多向层压板的疲劳性能”Proc.3rd Japan Intern.SAMPE Sympos.Vol.1。

I.Kimpara et al.: "Fatigue Properties of Multidirectional Laminates Using Pitch-based Carbon Fiber" Proc.3rd Japan Intern.SAMPE Sympos. Vol.1. p.445-450. (1993)

I.Kimpara 等人：“使用沥青基碳纤维的多向层压板的疲劳性能”Proc.3rd Japan Intern.SAMPE Sympos。

I.Kimpara et al.: "Fatigue Damage Accumulation and Strength of CFRP Laminates with Different Moduli and Stacking Sequences" Proc.9th Intern.Conf.on Compos.Mater. Vol.5. p.31-38. (1993)

I.Kimpara 等人：“具有不同模量和堆叠顺序的 CFRP 层压板的疲劳损伤累积和强度”Proc.9th Intern.Conf.on Compos.Mater。

I.Ohsawa et.al: "Acoustical Analysis of Transverse Lamina Cracking in CFRP Laminates under Tensile Loading" Proc.Fourth Intern.Sympos.on Acoustic Emission from Composite Materials(AECM-4). p.55-64. (1992)

I.Ohsawa 等人：“拉伸载荷下 CFRP 层压板横向层开裂的声学分析”Proc.Fourth Intern.Sympos.on Acoustic Emission from Composite Materials (AECM-4)。

I.Kimpara et al.: "Fatigue Damage accumulation and Strength of CFRP Laminates with Different Moduli and Stacking Sequence." Proc 9th Inter.Conf.Compos.Mater.Vol.8. 31-38 (1993)

I.Kimpara 等人：“不同模量和堆叠顺序的 CFRP 层压板的疲劳损伤累积和强度”。