工程可靠性与随机力学国际联合研究中心

2025年第3期（总第95期）学术报告

工程力学研究中心第49期学术报告

文远讲坛313期

报告主题TOPIC

• 多孔建筑材料的受压破坏 Compressive failure of a highly porous building material

报告人SPEAKER

• Prof. Michael Zaiser德国埃尔朗根-纽伦堡大学材料模拟研究所所长

报告时间TIME

• 2025年3月26日（周三）下午15:30-16:30
  

报告地点VENUE

• 同济大学土木大楼 A305
  

主持人CHAIR

• 任晓丹教授、陈建兵教授
  

联系人：

• 任宇东

报告内容Abstract

Highly porous materials may exhibit crack propagation under uniaxial compressive loads. We show experimental measurements and matching simulations of compressive failure of a soda-lime silicate glass foam used for heat insulation applications in buildings. Pristine specimens as well as specimens containing defects in form of circular holes and planar notches were subject to uni-axial displacement controlled loading. Simulations were conducted using a bond-based peridynamics framework which was generalized to incorporate local microstructural disorder.

In both simulations and experiment, failure of pristine specimens occurred by nucleation and subsequent propagation of compaction bands oriented perpendicular to the compression axis, accompanied by a catastrophic load drop. Reverse loading demonstrated that compressive failure was associated with a complete loss of cohesion (cleavage of the sample) across the compaction band. Specimens with pre-existing flaws failed by catastrophic expansion of the flaw, at loads that decreased with increasing flaw size in a manner consistent with predictions of quasi-brittle fracture mechanics. In the simulations, the size of the peridynamic horizon was found to define the process zone size of the quasi-brittle size effect law. Post-failure compressive deformation was found to occur by gradual widening of the compaction band at an approximately constant stress level, similar to observations of compaction bands in other cellular materials.

报告人简介Speaker Bio

Prof. Dr. Michael Zaiser is currently the head of Institute of Materials Simulation in Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Germany. He got his Ph.D. in theoretical physics at the Max-Planck-Institut für Metallforschung (MPI-MF) in Stuttgart, Germany. Before he came back to Germany, he was a professor and deputy head in the School of Engineering at the University of Edinburgh. His main research fields including dislocation theory, microstructures-based plasticity modelling, microstructure properties and design of metamaterials, deformation and failure of materials with amorphous or disordered microstructures, and data-driven approaches to materials design and property prediction. He has published more than 150 articles in peer-reviewed journals, including 2 in Science, 1 in Nature Physics, 1 in Nature Reviews Physics, 3 in Nature Communications and 6 in Physical Review Letters.

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