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چکیده
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Due to the advancement of technology and the manufacture of complex parts that were not possible in the past, in this article, three-dimensional functionally graded porous types of ∧ and ∨ (3D-FGP∧ and 3D-FGP∨) are made using a 3D printer. Carbon fiber reinforced Polylactic acid is used as material input for a 3D printer for fabricating the beams. Drop-weight impact tester device is used to extract low-velocity impact properties of the beams such as histories of the contact force, impactor displacement and absorbed energy. Experimental tests are carried out on the 3D-FGP∧ and 3D-FGP∨ beams with various holes diameter in a range of different impactor initial energies until the break. The important results show that the peak contact force of 3D-FGP∧ distribution is higher than the 3D-FGP∨ distribution and impact period, peak impactor displacement and absorbed energy have the opposite trend of contact force. In each case of 3D FGP∧ and 3D-FGP∨, as the hole diameter increases, the beams are broken at lower energy. Finally, the non-linear polynomial equation is presented to predict the absorbed energy and peak contact force, taking into account the inputs of hole diameter, impactor initial energy and type of hole distribution.
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