Crack growth along heterogeneous interface during the DCB experiment
Crack growth along heterogeneous interface during the DCB experiment
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DOI：
10.1016/j.ijsolstr.2017.05.013
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发表时间：
2017-08
影响因子：
3.6
通讯作者：
Simon Heide-Jørgensen;M. Budzik
中科院分区：
文献类型：
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作者：
Simon Heide-Jørgensen;M. Budzik
界面和键合线的非均质性是层合材料的固有部分。最近，这些不需要的特征越来越重要，增强了表面图案技术。在本论文中，对具有图案化界面的节点进行了双悬臂梁黏附实验。沿粘结表面产生垂直于裂纹扩展方向的弱/强粘结带。测试了大量具有不同但系统的弱/强区比的试样。一个新的分析模型，包括混合缩放规则，被开发，以获得现象学的见解，获得的数据。这里讨论了两种具体情况：单个强/弱转换和多个转换。结果表明，该模型与实验数据吻合较好。强调了三个长度尺度参数的作用，弱、强和过程区尺寸，以及它们之间的相互作用。例如，一旦存在较小的弱/强区域（与工艺区大小相比），就会记录到断裂能的大幅下降。这一观察结果对于理解自然（例如壁虎脚）和工业（层压和粘合材料）粘合线不连续性（包括填料、空隙或亲和键的作用）可能很重要。
Interface and bondline heterogeneities are inherent parts of laminated materials. Recently, these otherwise unwanted features are gaining importance enhanced by the surface patterning techniques. In the present contribution, a double cantilever beam adhesion experiment is performed on joints with patterned interfaces. Weak/strong adhesion bands perpendicular to the crack growth direction are produced along the bonded surfaces. A vast range of specimens with different but systematic weak/strong zone ratios is tested. A novel analytical model, including a rule of mixture scaling, is developed to gain phenomenological insights into the data obtained. Two specific cases are addressed: a single strong/weak transition and multiple transitions. The new model proves a very good agreement with the experimental data obtained for any configuration tested. The role of three length scale parameters, weak, strong and process zone sizes, and their interactions, are emphasized. For instance, once small (in comparison to the process zone size) weak/strong zones are present, a substantial decrease in the fracture energy is recorded. This observation may be of importance in understanding both natural (e.g. geckos feet) and industrial (laminated and bonded materials) bondline discontinuities including the role of fillers, voids or kissing bonds.