Title: Process Induced Variations in Polyjet Printing Under Tension-Tension Fatigue Loading – Investigations Via Homogenous 3-Dimensional Test Coupons
Authors: Ravi Pratap Singh. Tomar, Furkan. Ulu, Ram V. Mohan and Ajit D. Kelkar
Abstract: The capability of additive manufacturing (AM) for making monolithic, multi-material structures allows the fabrication of complex parts with varying mechanical properties, material combinations, and phases. Due to the flexibility of orientating the digital design in AM, a part can be created in any orientation; however, processing-induced variations affect the mechanical properties of final parts as the way AM forms a part is different from traditional manufacturing and could lead to many artifacts. This paper investigates the effects of process variations on the tension – tension fatigue behavior in Polyjet by designing a homogeneous 3-D test coupon configuration. In traditional 2D coupons, one direction is thinner than the other two directions, which may not account for non-uniformity in a material deposition during printing. Further, the effect of normal strain is not effectively captured. To understand the process-induced variation and to capture the normal strain effect, this work proposed and evaluated a homogenized 3D configuration test coupon and evaluated material behavior under tension-tension fatigue loading. Study findings provide insight on the limitation of traditional fatigue test coupons and allow for careful evaluation of process variation effects in PolyJet printing. The effect of print orientations on the tension-tension fatigue characteristics is studied and presented. Further test results help to develop a safe material design envelope that can be used as a design guideline for a specific material without worrying about build orientation.
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Conference: SAMPE 2020 | Virtual Series
Publication Date: 2020/06/01
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