U.S.-Netherlands Cooperative Research: Evaluation of Mixed Mode Crack Propagation in Concrete Using Acoustic Emission

该奖项为Wessels Suaris教授提供了部分支持 与迈阿密大学合作， 与杨G教授会面M.货车米尔 德尔夫特理工大学土木工程系 荷兰. 这些调查人员对混合的兴趣- 混凝土裂缝扩展模式 它们将进行剪切 混凝土断裂试验，声发射监测， 使用荷兰大学提供的双轴试验台。 荷兰集团提供世界一流的实验室设施， 将其置于实验性土木工程的前沿 research. 他们开发了混合模式加载技术 这对拟议的研究至关重要。 其用途将是 结合目前新的声学监测技术， 由苏阿里斯教授开发 他有很强的分析能力 无损检测技术的背景和经验。 这些互补的技能和他们在 混凝土断裂应该会导致非常富有成效的合作， 定量配给。 混凝土结构的破坏涉及大量的 数量的裂缝。 使用断裂力学是很自然的 方法来表征混凝土的行为。 但 今天人们普遍认为经典断裂力学， 它是为均匀的纯脆性材料开发的， 不适用于混凝土。 这是因为相对而言， 大的断裂过程区发育，经历软化 损害 因此，在过去十年中， 已经进行了关于开发一种断裂形式的研究 力学适用于混凝土。 的拟议合作 将有助于这一努力， 混凝土在压力下的行为。

This award provides partial support for Professor Wimal Suaris of the University of Miami to collaborate during a long term visit with Professor Jan G. M. van Mier of the Faculty of Civil Engineering of Delft University of Technology, The Netherlands. These investigators share an interest in mixed- mode crack propagation of concrete. They will conduct shear fracture tests on concrete, with acoustic emission monitoring, using the biaxial test rig available at the Dutch University. The Dutch group offers world class laboratory facilities that place it at the forefront of experimental civil engineering research. They have developed the mixed-mode loading technique that is crucial for the proposed research. Its use will be combined with a novel acoustic monitoring technique currently being developed by Professor Suaris. He has a strong analytical background and experience in non-destructive testing technology. These complementary skills and their mutual interest in the fracture of concrete should result in a very fruitful collabo- ration. The failure of concrete structures involves a substantial amount of cracking. It is natural to use a fracture mechanics approach to characterize the behavior of concrete. However, it is generally accepted today that classical fracture mechanics, which was developed for homogeneous purely brittle materials, is inapplicable for concrete. This is because a relatively large fracture process zone develops which undergoes softening damage. Therefore, during the last decade, substantial research has been conducted on developing a form of fracture mechanics applicable for concrete. The proposed collaboration will contribute to that effort and lead to improved understanding of the behavior of concrete under stress.