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Dynamic Response of Acrylonitrile Butadiene Styrene Under Impact Loading (Open Access)
Journal Article - Open Access
HOWARD UNIV WASHINGTON DC WASHINGTON DC United States
Pagination or Media Count:
The goal of the study is to understand the potential energy absorption benefits of components fabricated using fused deposition modeling additive manufacturing under high strain rate loading. Tensile tests were conducted on 3-D printed acrylonitrile butadiene styrene ABS at different strain rates, according to the ASTM D638 standard, to assess its strain rate sensitivity under quasi-static loads. The tensile test was also necessary to determine the mechanical properties necessary to characterize the dynamic response of the ABS at high strain rates. The ABS specimens were subjected to high strain rate deformation through the use of the split Hopkinson pressure bar. During compression, a new phenomenon described as a multistage collapse in which the samples undergo multiple stages of contraction and expansion was observed as the impact load was applied. This multistage deformation behavior may be attributable to the ring formed around layers in the specimen due to the manner of fabrication which potentially absorbed and released the energy, thus acting as a multistage spring. As the velocity of impact increases, it is observed that the ABS capability for energy absorption decreased to where there was only one stage of compression equivalent to the initial stage. The multistage collapse of the 3-D printed ABS specimen indicates a potential for a novel energy absorption mechanism to be exploited at lower strain rates. Future work in the area should include more studies about printing orientation, as well as investigating the impact of the presence of the outer cylindrical ring on the overall dynamic response.
APPROVED FOR PUBLIC RELEASE