Crush performance of different additively manufactured maraging steel microlattice reinforced plates

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University of New Brunswick
This research began with determining the viability of maraging steel (Maraging300) as a material for additively manufactured microlattices, through Laser-powder bed fusion (L-PBF), intended for energy absorption applications. Having done so through the design, manufacturing, testing, and analysis of a rhombic dodecahedron structure the research moved on to more structurally significant microlattices such as the body centered cubic. Scanning electron microscopy and micro-CT scans were used to verify the structural integrity of the printed microlattices. During the testing and analysis, it was observed that a 45° shear band was the main weakening mechanism during collapse. It was hypothesized that adding an intermediate plate to the microlattice structure would inhibit this shear band and in turn strengthen the microlattice. This was successful. Also, a finite element model was developed using commercial package (LS-DYNA) to simulate the uniaxial crush of the microlattices for comparison with their experimental counterparts. Very good agreement between the experimental results and the modeling predictions was observed.