Fracture loads prediction of the modified 3D-printed ABS specimens under mixed-mode I/II loading

Abstract

The fracture features of the 3D-printed samples are assessed employing Semi-Circular Bending (SCB) specimens. The critical failure loads are experimentally measured and have been predicted using both Maximum Tangential Stress (MTS) and Generalized Maximum Tangential Stress (GMTS) criteria. The 3D-printing process is improved with several approaches to decline the voids volume and escalate the weld lines strength of the 3D-printed specimens to boost their mechanical specifications. The Acrylonitrile Butadiene Styrene (ABS) SCB samples with numerous pre-crack angles ranged from pure mode I to pure mode II are produced utilizing a modified 3D-printing process. The results of the tensile tests confirmed that the properties of the specimens created by the modified 3D-printing process are independent of the raster of printing orientation. The predicted failure loads with the GMTS criterion had a better correlation with the experiment compared to the MTS criterion owing to the impact of the T-stress term in the 3D-printed SCB samples. Furthermore, the cross laminar fracture augmented fracture toughness and declined crack kinking behavior of the 3D- printed ABS specimens.