SLM 钛合金蜂窝结构的面内压缩力学行为

In order to explore the potential application of additively manufactured metal honeycomb structures in the field of protection, titanium alloy honeycomb samples were prepared by selective laser melting (SLM), and uniaxial in-plane compressive mechanical experiments were carried out. Periodic crushing and unloading phenomena appeared in the platform section, which was different from the features of the platform section of traditional plastic/brittle materials honeycomb. Using the digital camera and scanning electron microscope, the structural deformation modes and fracture failure mechanism were analyzed. Based on the parametric finite element analysis, the influence of wall thickness on the crushing and unloading of honeycomb structures was studied. The results showed that: the titanium alloy honeycomb samples prepared by SLM had high printing accuracy and small difference in mechanical properties; when the titanium alloy honeycomb structure was compressed in the plane, the fracture of the honeycomb edge connection in the structural shear zone results in the periodic crushing and unloading in the stress-strain curve of the structure; obvious dimples could be observed on the fracture surface at the failure site, showing an obvious plastic failure morphology; the wall thickness thinning can effectively increase the rotation angle of the short side of the honeycomb during failure and reduce the minimum bending radius, thus significantly improving the crushing and unloading phenomena and enhancing the bearing stability of the structure.