Abstract This study examines the fracture behavior of two thermosetting polymer resins for additive manufacturing (AM) and specifically presents the role of print orientation on the quasi-static and dynamic fracture responses of DA-3 resin printed via digital light processing (DLP) and PM-EM828 resin printed via stereolithography (SLA). A unique long-bar apparatus is used to launch a striker at the opposite end of a notched and pre-cracked specimen to create a dominantly Mode-I (opening) fracture event. Digital image correlation (DIC) is used in conjunction with ultra-high-speed imaging to capture the evolving displacement fields ahead of the crack tip. The elastodynamic solution for a stationary crack is used to determine the critical stress intensity factor (SIF), and the asymptotic steady-state dynamic crack solution is used to examine propagation behavior. These results are compared to quasi-static experiments of the same material and similar geometries on a standard load frame. Both DA-3 and PM-EM828 exhibited higher quasi-static fracture toughness values than critical dynamic stress intensity values, although the PM-EM828 demonstrated less rate dependence on fracture toughness than DA-3. Overprinting the last two layers of the weakest DA-3 orientation proved to enhance isotropy of DLP 3-dimensional (3D) printed DA-3 plaques while PM-EM828 plaques 3D printed by SLA did not show significant anisotropy.
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Morgan et al. (2024) studied this question.
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