北京航空航天大学学报 ›› 2016, Vol. 42 ›› Issue (9): 1936-1943.doi: 10.13700/j.bh.1001-5965.2015.0557

• 论文 • 上一篇    下一篇

基于准静态拉伸试验的临界CTOA测量

鲁龙坤1, 王生楠1, 王照1, 宋恩鹏2   

  1. 1. 西北工业大学 航空学院, 西安 71007;
    2. 中航工业沈阳飞机设计研究所, 沈阳 110035
  • 收稿日期:2015-08-31 出版日期:2016-09-20 发布日期:2015-11-19
  • 通讯作者: 王生楠,Tel.:029-88460498,E-mail:wangshna@nwpu.edu.cn E-mail:wangshna@nwpu.edu.cn
  • 作者简介:鲁龙坤,男,博士研究生。主要研究方向:断裂、疲劳与损伤容限。E-mail:1768614416@qq.com;王生楠,男,博士,教授,博士生导师。主要研究方向:结构疲劳、断裂、损伤容限、可靠性。Tel.:029-88460498,E-mail:wangshna@nwpu.edu.cn

Critical CTOA measurement based on quasi-static tensile test

LU Longkun1, WANG Shengnan1, WANG Zhao1, SONG Enpeng2   

  1. 1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 71007;
    2. AVIC Shenyang Aircraft Design Institute, Shenyang 110035, China
  • Received:2015-08-31 Online:2016-09-20 Published:2015-11-19

摘要: 为了寻求更为简单、准确的临界裂纹尖端张开角(CTOAc)测量方法以推广CTOA准则的应用,本文对材料CTOAc的测量方法进行了研究。根据CTOA的性质及Göteborgs Kungliga Segel Sällskap(GKSS)提出的CTOAc估算方法导出了两种不同裂纹尖端张开位移(CTOD)定义之间的关系,并进一步得到一种基于准静态拉伸试验的CTOAc测量方法,该方法与GKSS提出的估算方法相等效但更加简单。为了验证准静态拉伸试验法的准确性,对7B04 M(T)试样进行了静态拉伸试验,并使用上述两种方法估算7B04的CTOAc,结果表明两种方法估算出的CTOAc仅相差1%。同时分别采用平面应变核模型、平面应力模型对试样进行了弹塑性有限元模拟,模拟结果与试验结果相吻合。

关键词: 临界裂纹尖端张开角(CTOAc), 裂纹尖端张开位移(CTOD), 准静态拉伸试验, 平面应变核模型, 弹塑性有限元模拟

Abstract: In order to find a more simple and accurate measurement critical crack tip opening angle (CTOAc) method and promote CTOA criterion's application, measurement methods of material CTOAc were studied. The relationship between two different crack tip opening displacement (CTOD) definitions has been derived from CTOA's properties and CTOAc estimation method proposed by Göteborgs Kungliga Segel Sällskap (GKSS). Upon the relationship, a CTOAc measurement method based on quasi-static tensile test was proposed, which is equivalent to but simpler than GKSS estimation method. In order to verify the validity of the proposed method, static tensile tests on 7B04 M(T) specimens were performed, and the 7B04's CTOAc values were estimated by the two methods above. The results show that only 1% discrepancies have been observed between the two CTOAc values. In addition, plane strain core model and plane stress model on specimens were generated in elastic plastic finite element, and the simulation results have coincided with test results.

Key words: critical crack tip opening angle (CTOAc), crack tip opening displacement (CTOD), quasi-static tensile tests, plane strain core model, elastic plastic finite element simulation

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