[1]王综轶,王元清,杜新喜,等.不同温度下有机玻璃厚板的平面应变断裂韧性试验[J].东南大学学报(自然科学版),2018,48(5):864-870.[doi:10.3969/j.issn.1001-0505.2018.05.013]
　Wang Zongyi,Wang Yuanqing,Du Xinxi,et al.Plain-strain fracture toughness tests of thick acrylic sheets at different temperatures[J].Journal of Southeast University (Natural Science Edition),2018,48(5):864-870.[doi:10.3969/j.issn.1001-0505.2018.05.013]
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不同温度下有机玻璃厚板的平面应变断裂韧性试验()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
48
期数:
2018年第5期
页码:
864-870
栏目:
材料科学与工程
出版日期:
2018-09-20

文章信息/Info

Title:
Plain-strain fracture toughness tests of thick acrylic sheets at different temperatures
作者:
王综轶1; 2; 王元清1; 杜新喜2; 王喆3; 张天雄4
1清华大学土木工程安全与耐久教育部重点实验室, 北京 100084; 2 武汉大学土木建筑工程学院, 武汉 430072; 3清华大学工程物理系, 北京100084; 4天津大学建筑工程学院, 天津 300072
Author(s):
Wang Zongyi1; 2;  Wang Yuanqing1;  Du Xinxi2;  Wang Zhe3;  Zhang Tianxiong4
1Key Laboratory of Civil Engineering Safety and Durability of Education of Ministry, Tsinghua University, Beijing 100084, China
2School of Civil Engineering, Wuhan University, Wuhan 430072, China
3Department of Engineering Physics, Tsinghua University, Beijing 100084, China
4School of Civil Engineering, Tianjin University, Tianjin 300072, China
关键词:
有机玻璃;  断裂韧性;  三点弯试验;  断口形貌;  断裂力学
Keywords:
acrylic;  fracture toughness;  three-point bending test;  fracture morphology;  fracture mechanics
分类号:
TU532
DOI:
10.3969/j.issn.1001-0505.2018.05.013
摘要:
为研究有机玻璃平面应变断裂韧性(KIC)与温度的关系, 设计了母材和带拼接缝试件, 在-40~40 ℃范围内进行三点弯试验.采用疲劳试验机预制疲劳裂纹, 利用酒精和液氮对试件降温,用纯水进行升温,观察试件宏观断口形貌, 结合有限元和断裂力学进行算例分析. 结果表明:在低温下, 试件达到极限荷载后迅速断裂, 失稳扩展的裂纹临界长度较小, 裂纹扩展速率快; 高温下, 临界长度较大, 裂纹扩展速率慢. 母材试件在20 ℃时KIC最小,-20 ℃时最大,而带拼接缝试件在40 ℃时KIC最小,-40 ℃时最大. 断面上沿裂纹扩展方向的弧状条纹数增多会导致KIC降低, 当出现垂直于疲劳裂纹边缘线的放射状条纹时,KIC进一步降低. 对于所提算例, 裂纹尖端各点的应力强度因子随裂纹深度的增加而增加.
Abstract:
To study the relationship between the plain-strain fracture toughness(KIC)of acrylic and the temperature, the base-material specimens and the specimens with joint area were designed. The three-point bending tests were conducted at the temperature of -40 to 40 ℃. The fatigue cracks were prefabricated by a fatigue test machine. The temperature of the specimens was reduced by alcohol and liquid nitrogen, while it was increased by purified water. The macroscopic fracture morphologies of the specimens were observed. Cases were studied based on finite element and fracture mechanics theories. The results show that the specimens rupture rapidly after the ultimate loads at low temperature. The critical crack lengths of unstable propagation are relatively small and the propagation speeds are fast. At high temperature, the critical crack lengths are large and the propagation speeds are low. As for base material, KIC is the lowest at 20 ℃ and the highest at -20 ℃. As for the joint area, KIC is the lowest at 40 ℃ and the highest at -40 ℃. The increase of the number of the arc-shaped marks along the crack propagation direction leads to the decrease of KIC. When the radial-pattern marks vertical to the edge of fatigue crack appear, KIC decreases further. For the proposed cases, the stress intensity factors of the various points at the crack front increase with the increase of the crack depth.

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相似文献/References:

[1]王综轶,王元清,杜新喜,等.不同温度下有机玻璃厚板的准静态拉伸试验研究[J].东南大学学报(自然科学版),2018,48(1):132.[doi:10.3969/j.issn.1001-0505.2018.01.020]
　Wang Zongyi,Wang Yuanqing,Du Xinxi,et al.Quasi-static tensile test of thick acrylic sheets at different temperatures[J].Journal of Southeast University (Natural Science Edition),2018,48(5):132.[doi:10.3969/j.issn.1001-0505.2018.01.020]

备注/Memo

备注/Memo:
收稿日期: 2018-03-12.
作者简介: 王综轶(1990—),男,博士,助理研究员;王元清(联系人),男,博士,教授,博士生导师,wang-yq@mail.tsinghua.edu.cn.
基金项目: 国家自然科学基金资助项目(51678339)、中国博士后科学基金资助项目(2018M630164).
引用本文: 王综轶,王元清,杜新喜,等.不同温度下有机玻璃厚板的平面应变断裂韧性试验[J].东南大学学报(自然科学版),2018,48(5):864-870. DOI:10.3969/j.issn.1001-0505.2018.05.013.
更新日期/Last Update: 2018-09-20