PMMA断裂韧度尺寸相关性的实验研究
Experimental Study of Size Dependence of Fracture Toughness of PMMA
作者：董世明(四川大学 建环学院，四川 成都 610065)；汪洋(中国科学技术大学 力学与机械工程系，安徽 合肥 230027)；夏源明(中国科学技术大学 力学与机械工程系，安徽 合肥 230027)
Author：(School of Architecture and Environment,Sichuan Univ., Chengdu 610065, China)；(Dept. of Mechanics and Mechanical Eng., Univ. of Sci. and Techno. of China, Hefei 230027,China)；(Dept. of Mechanics and Mechanical Eng., Univ. of Sci. and Techno. of China, Hefei 230027,China)
收稿日期：2005-11-03 年卷（期）页码：2006,38(4):49-52
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：有机玻璃；中心裂纹圆盘；断裂韧度；尺寸相关性
Key words：polymethyl methacrylate (PMMA); central cracked circular disk (CCCD); fracture toughness; size dependence
基金项目：国家自然科学基金资助项目（10202021）
中文摘要
为了研究断裂韧度的尺寸相关性，采用中心裂纹圆盘试件，在岛津材料试验机上对有机玻璃(PMMA)纯Ⅰ型、纯Ⅱ型准静态加载条件下的断裂行为进行了实验研究。结果表明，PMMA的断裂韧度与试件的裂纹相对长度α相关，且在试验尺寸范围内I型断裂韧度KIc和Ⅱ型断裂韧度KⅡc均随α增加而降低；KIc受α的影响相对较大，而KⅡc受α的影响相对较小。PMMA的Ⅱ型断裂韧度KⅡc小于I型断裂韧度KIc。
英文摘要
In order to study the size dependence of the fracture toughness, pure mode I and pure model Ⅱ fracture tests for polymethyl methacrylate (PMMA) were performed under quasi static loading by using central cracked circular disk specimen. The experimental results show that the fracture toughness of PMMA is dependent on the relative crack length α, and the pure model I fracture toughness and the pure model Ⅱ fracture toughness decrease with increasing the relative crack length α. The relative crack length has a larger effect on the pure model I fracture toughness, and a smaller effect on the pure model Ⅱ fracture toughness. In addition, the experimental results also show that the pure model Ⅱ fracture toughness of PMMA is less then the pure model I fracture toughness.
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