Sizing of Cracks in Welded Details – Beyond Nondestructive Testing

报告题目：Sizing of Cracks in Welded Details – Beyond Nondestructive Testing

报告人：QIAN Xudong Associate Professor National University of Singapore

报告时间：7月29日（周六） 14:00-15:30

报告地点：明志楼A536

报告人简介：

Dr. QIAN Xudong is currently an Associate Professor in the Department of Civil and Environmental Engineering (CEE) at the National University of Singapore (NUS), Deputy Head of CEE at NUS, Group Head of the Structural and Offshore Engineering, Director for Centre for Offshore Research and Engineering (CORE), and Director for Centre for Advanced Materials and Structures (CAMS) NUS. He received his Bachelor (1^st Class Honors) and PhD in Civil Engineering from NUS in 2000 and 2005, respectively. Prior to joining NUS as a faculty member, he worked as a post-doctoral research associate in the Department of Civil and Environmental Engineering, University of Illinois at Urbana Champaign (UIUC). Prof Qian’s research interest focuses on experimental fracture mechanics, data driven digital twins for welded structures, fracture, fatigue and integrity assessment for large-scale structures, welded connections, steel-concrete-steel composite structures, and polymer composite materials. Prof Qian is a member of editorial board in a number of premier journals including Engineering Fracture Mechanics, Fatigue and Fracture of Engineering Materials and Structures, etc. Prof Qian has been serving as members in different Technical Committees for the International Ship and Offshore Structures Congress from 2009 to 2018. He is also a member of the technical committee in American Society of Testing and Material E08 – Fatigue and Fracture and F42 – Additive Manufacturing

报告内容摘要：

Cyclic loadings caused by the environmental actions or artificial loadings often lead to fatigue crack initiation and propagations in welded details in large-scale engineering structures. Accurate sizing of the cracks in the critical welded details are of paramount important to ensure the safe operation and service of these engineering structures. This presentation starts by examining the practical nondestructive testing techniques in measuring the crack sizes in the welded connections, e.g., the alternating current potential difference and the ultrasonic phased array. This seminar will also present some recent efforts to enhance the accuracy of the crack sizing by image processing as well as by establishing a reference free approach. Using the nondestructive testing results as a benchmark, the speaker will share some recent advancement in the physics-informed, data-driven approach to determine the size of surface cracks with complex shapes in the welded connections.

主办单位：土木工程与测绘学院

科学技术发展研究院