Basic study of the strength evaluation of honeycomb structure which has an adhesion defect

存在粘附缺陷的蜂窝结构强度评价的基础研究

• 批准号: 11650101
• 负责人: CHEN Daiheng
• 金额: $ 2.24万
• 依托单位: Science University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650101/
• 关键词: honeycomb; adhesion defect; stress singularity; stress intensity factor; fracture mechanics; interface crack

In the present study, the approach of the fracture mechanics for the crack problem is applied to the strength evaluation of honeycomb structure, which has an adhesion defect. A detailed examination was done about stress distribution in the neighborhood at the tip of the adhesion defect. It got the following conclusion.(1) It was cleared from results of the numerical analytic result based on the finite element method that the stress singularity occurs in the neighborhood at the tip of the adhesion defect.(2) Based on the theory analytic model, it was cleared that the order of the stress singularity at the tip of the adhesion defect is -1/2.(3) The general style of singular stress field to be formed at the tip of the adhesion defect of honeycomb was found by the theory analytic model.(4) Parameter of stress intensity factor, which defines the strength of the singular stress field, is introduced based on the above investigation.(5) The stress intensity factor is in proportion to the square root of the length of the adhesion defect as a result of examining the influence of the form like each geometry which exerted it on * power expansion coefficient(6) The stress intensity factor is controlled in the shear stress on the adhesion layer, and is in proportion to the value of the shear stress.

本文将裂纹问题的断裂力学方法应用于具有粘结缺陷的蜂窝结构的强度评价。对附着缺陷尖端附近的应力分布进行了详细的研究。它得到了以下结论。(1)基于有限元法的数值分析结果表明，附着缺陷尖端邻域存在应力奇点。(2)基于理论分析模型，明确了附着缺陷尖端应力奇点的阶数为-1/2。(3)通过理论解析模型得到了蜂窝粘结缺陷尖端形成的奇异应力场的一般形式。(4)在此基础上，引入了定义奇异应力场强度的应力强度因子参数。(5)应力强度因子与附着缺陷长度的平方根成正比，这是考察施加它的各几何形状对*幂膨胀系数的影响的结果。(6)应力强度因子受附着层上的剪切应力控制，与剪切应力的值成正比。

项目成果

陳玳こう: "固有関数展開法による接合角部の応力特異性の解析"日本機械学会論文集. 65・635. 1437-1444 (1999)

陈令口：“使用特征函数展开法分析接头角部的应力奇点”日本机械工程学会会刊65・635（1999）。

Dai-heng CHEN and Kenichi KOHANAWA: "Singularity for a Conner of a T-Shaped Junction"Trans.Of the Japan Society of Mechanical Engineers. (in print). 67-657 (2001)

Dai-heng CHEN 和 Kenichi KOHANAWA：“T 形连接处角的奇点”，译自日本机械工程学会。

陳玳こう: "T型接合角部における応力特異性"日本機械学会論文集. 67(印刷中). (2001)

陈令口：“T 型接头拐角处的应力奇点”，日本机械工程学会论文集 67（出版中）。

陳玳こう,小塙健一: "T型接合角部における応力特異性"日本機械学会論文集A編. (掲載可).

Lingkou Chen，Kenichi Kobanawa：“T 形接头拐角处的应力奇点”，日本机械工程师学会会议录，A 版（可出版）。