عنوان	Bi-directional porous beams under low-velocity impact: Made of carbon fiber reinforced PLA, fabrication with 3D printer and testing with impact equipment
نوع پژوهش	مقاله چاپ‌شده در مجله
کلیدواژه‌ها	Additive manufacturing, 3D printing, PLA-CF, functionally graded porous, drop-weight impact testing equipment
چکیده	In this article, two-dimensional functionally graded porous types ⋀ and ⋁ (2D-FGP⋀ and 2D-FGP⋁) are manufactured using a 3D printer. This is made feasible by technological advancements that have made it possible to make complicated parts that were before unattainable. The Polylactic acid reinforced with carbon fiber (PLA-CF) is fed into a 3D printer to create the beams. The low-velocity impact attributes of the beams, such as histories of contact force, impactor displacement, and absorbed energy, are extracted using drop-weight impact testing equipment. The 2D-FGP⋀ and 2D-FGP⋁ beams with varied hole diameters are tested in a variety of impactor initial energies till are broken. The significant findings indicate that the 2D-FGP⋀ distribution’s peak contact force is greater than the 2D-FGP⋁ distribution and that this trend is reversed for impact time, absorbed energy and peak impactor displacement. In both 2D-FGP⋀ and 2D-FGP⋁ scenarios, the beams break at a lower energy as the hole diameter grows. A non-linear polynomial equation that incorporates the inputs of hole diameters, impactor initial energy and hole type distribution is provided to forecast the peak contact force and absorbed energy.
پژوهشگران	شاپور ابراهیمی (نفر اول)، سعید فعلی (نفر دوم)، مهدی رنجبر روئین تن (نفر سوم)