Dr Cheng Huang is a Research Associate in the Department of Civil and Environmental Engineering at Imperial College London. He obtained his Bachelor's degree in Civil Engineering from Hunan University and his Master's degree in Structural Engineering from Tongji University, and then his PhD degree in Structural Engineering from Imperial College London. His principal research interests lie in the areas of structural testing, numerical modelling, and the development of stability and fatigue design guidance for 3D printed steel structures.
AbstractWire arc additive manufacturing (WAAM) is a metal 3D printing technique that is well recognised in the construction sector for its high efficiency, cost-effectiveness and flexibility in build scales. However, there remains a lack of fundamental data on the structural performance of WAAM elements, especially regarding their fatigue behaviour. A comprehensive experimental study into the fatigue behaviour of WAAM steel plates has therefore been undertaken and is reported herein. Following geometric, mechanical and microstructural characterisation, a series of WAAM coupons was tested under uniaxial high-cycle fatigue loading. A total of 75 fatigue tests on both as-built and machined coupons, covering various stress ranges and stress ratios, have been conducted. The fatigue test results were analysed using constant life diagrams (CLDs) and S-N (stress-life) diagrams. The CLDs revealed that the fatigue strength of the as-built WAAM steel was relatively insensitive to the different stress ratios. The S-N diagrams showed that the surface undulations resulted in a reduction of about 35% in the fatigue endurance limit for the as-built WAAM material relative to the machined material, and a reduction of about 60% in the fatigue life under the same load level. The as-built and machined WAAM coupons were shown to exhibit similar fatigue behaviour to conventional steel butt welds and structural steel S355, respectively. Preliminary S-N curves were also proposed for the WAAM steel.
|Room 6||Wednesday 29th November||18:00-18:30||Cheng Huang|
S01-2 Additive Manufacturing
52 - Fatigue behaviour of wire arc additively manufactured sheet material