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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 12
SUMMARY:A model for high-cycle fatigue behavior of wire and arc additive manufactured steel
DESCRIPTION:Wire 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 mean stress levels, have been conducted. The local stress concentrations in the as-built coupons, induced by their surface undulations, have also been studied by numerical simulations. The obtained fatigue test results were analysed using constant life diagrams (CLDs) and S-N (stress-life) diagrams, based on both nominal and local stresses. The CLDs revealed that the fatigue strength of the as-built WAAM steel was relatively insensitive to the different mean stress levels. 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 material, relative to the machined material, and a reduction of about 60% in the fatigue life for a given stress 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 local stress-based and nominal stress-based S-N curves are also proposed for the WAAM steel.
CLASS:PUBLIC
DTSTART:20230614T145000
DTEND:20230614T151000
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