顾鑫
河海大学
Peridynamic Modeling and Implicit Solution for Hydrogen Embrittlement Fracture: Coupling Diffusion and Deformation via Multi-mechanism
Hydrogen embrittlement, a prevalent failure mode of metallic materials in hydrogen-containing environments, poses a widespread threat to the service safety of key structures in the energy, transportation, chemical engineering, and other fields. This often leads to unforeseen brittle fracture of components, resulting in severe economic losses and potential safety hazards. To address this issue, this study proposes a fully coupled peridynamics for hydrogen diffusion and hydrogen-induced deformation and fracture. Specifically, the peridynamic hydrogen embrittlement model integrates the interaction mechanisms of hydrogen-enhanced local plasticity (HELP) and hydrogen-enhanced decohesion (HEDE). A hydrogen concentration-dependent bond-based peridynamic elastoplastic model is developed, and a hydrogen concentration-related bond breakage criterion is introduced to accurately characterize the influence of hydrogen on the mechanical properties and fracture behavior of materials. To efficiently solve the coupled system, a high-performance implicit staggered solution is further developed, for which the backward Euler implicit method is adopted to solve the hydrogen diffusion stably and efficiently, and the Newton-Raphson method is used to solve the elastoplastic deformation and quasi-static fracture in hydrogen embrittlement accurately and efficiently. The proposed theoretical model and numerical algorithm can efficiently reflect the hydrogen diffusion in materials, the hydrogen-induced deformation, and the crack initiation and propagation, providing a powerful theoretical and numerical tool for in-depth understanding of hydrogen embrittlement mechanisms and evaluating the safety of structures in hydrogen-containing environments.
顾鑫,博士、河海大学力学与工程科学学院副教授、硕士生导师。担任南方计算力学联络委员会委员、江苏省力学学会青年工作委员会委员,以及《计算力学学报》、《应用数学和力学》和《应用力学学报》青年编委。主要从事计算力学理论与新型数值方法、近场动力学和非局部理论、材料与结构破坏的多物理场多尺度力学、冲击动力学、水利土木能源工程中的力学问题分析等科学研究。主持负责科研项目8项,以项目骨干身份参加科研项目十余项。合作出版专著1部,发表论文73篇(48篇SCI、9篇EI、15篇中文核心、1篇国际会议),取得14项软件著作权,授权或受理10项发明专利。