Study on the compression energy absorption characteristics of 3D printed PLA and PLA-Cu materials

Abstract

In order to study the static compression mechanical properties and energy absorption characteristics of 3D printing polylactic acid (PLA) and copper powder filled polylactic acid (PLA-Cu) materials, quasi-static compression tests were carried out at room temperature using CMT5105 microcomputer controlled electronic universal testing machine. The results show that the stress-strain curves of the two materials show the compression characteristics of porous materials, and have typical three-stage characteristics. The compression bearing capacity of PLA-Cu materials is significantly higher than that of PLA materials. When the strain is 80 %, the energy absorption per unit volume of PLA material can reach 78.27 MJ / mm3. After adding copper powder, the energy absorption per unit volume of PLA material can be increased by 51.7 %, indicating that 3D printing products have excellent impact resistance and buffer energy absorption characteristics.