| On the fracture resistance of adhesively jointing structures |
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| 作者姓名： | ZHOU Zhi-qiang YANG Qing-da CHEN Wel-qlu |
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| 作者单位： | ZHOU Zhi-qiang1，YANG Qing-da2，CHEN Wei-qiu?1 (1Department of Civil Engineering，Zhejiang University，Hangzhou 310027，China) (2Rockwell Scientific Co.，LLC，1049 Camino Dos Rios，Thousand Oaks，CA 91360，USA) |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (No. 10272088), and the Program for New Century Excellent Talents in University, China |
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| 摘 要： | INTRODUCTION Adhesive bonding technology has been widely applied in modern structures in industries such as automotive, aerospace and in microelectronic device. The core idea of this technology is to bond two similar or dissimilar structure members with a thin continuous interface layer which can provide far better stress transfer across the interface than those traditional point-wise joining technologies such as spot welding, riveting and bolting. Furthermore, the damage tolerance proper…
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| 关 键 词： | 断裂力学 粘合剂 粘合区模型 断裂阻力 焊接结构 |
| 收稿时间： | 2006-05-02 |
| 修稿时间： | 2006-05-31 |
On the fracture resistance of adhesively jointing structures |
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| ZHOU Zhi-qiang YANG Qing-da CHEN Wel-qlu.On the fracture resistance of adhesively jointing structures[J].Journal of Zhejiang University Science,2006,7(8):1289-1295. |
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| Authors: | Zhi-qiang Zhou Qing-da Yang Wei-qiu Chen |
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| Institution: | (1) Department of Civil Engineering, Zhejiang University, Hangzhou, 310027, China;(2) Rockwell Scientific Co., LLC, 1049 Camino Dos Rios, Thousand Oaks, CA 91360, USA |
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| Abstract: | The interface toughness of adhesively bonded structural members is one of the critical parameters for adhesive joint design. It is often assumed that the joint toughness is a material constant so that its value can be obtained from fracture tests of simple geometries such as DCB for Mode-I, ENF for Mode-II, using linear elastic fracture mechanics (LEFM). However, the LEFM assumption of point-wise crack-tip fracture process is overly simplistic and may cause significant error in interpreting fracture test data. In this paper, the accuracy and applicability of various traditional beam-bending-theory based methods for fracture toughness evaluation, such as simple beam theory (SBT), corrected beam theory (CBT) and experimental compliance method (ECM), were assessed using the cohesive zone modelling (CZM) approach. It was demonstrated that the fracture process zone (FPZ) size has profound influence on toughness calculation and unfortunately, all the classic beam-bending theories based methods fail to include this important element and are erroneous especially when the ratio of crack length to FPZ size is relatively small (<5.0). It has also been demonstrated that after the FPZ size is incorporated into simple beam formulations, they provide much improved evaluation for fracture toughness. Formulation of first order estimate of FPZ size is also given in this paper. |
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| Keywords: | Fracture mechanics Adhesive Cohesive zone model (CZM) |
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