The work aims to calibrate the PET material card and use it for tray pressure simulation, optimize the PET tray structure through orthogonal experimental simulation, and analyze the problem of color development of pressure-sensitive paper caused by deformation during tray pressure testing. Tensile tests were performed on PET materials using M24 material cards in LS-DYNA for simulation. By comparing the tensile stress-strain curves, the compatibility between M24 material cards and PET materials was verified. In LS-DYNA, M24 material cards were used to perform pressure simulation analysis on the tray, and the maximum deformation of the pressure surface obtained from the simulation and the color position of the pressure-sensitive paper were compared to determine the reliability of the simulation method. Simulation methods were used to perform orthogonal verification on the tray structure, determine its impact on support strength, and optimize the tray structure based on the results of orthogonal experiments. Under different strain rates of 0.001, 0.01, and 0.1 s-1, the tensile simulation errors of PET materials were 3.0%, 3.3%, and 4.6%, respectively. M24 material cards were used to simulate the pressure on the tray. The maximum deformation position of the pressure surface was consistent with the color development position of the pressure-sensitive paper, and the color development shape was consistent with the contour of the tray pressure surface. Orthogonal simulation verification was conducted on the tray structure, and the optimal combination was obtained as follows: the number of inward reverse buckles was 14 (28), the number of outward reverse buckles was 13 (26), the fixed reverse buckles were arranged inward and the movable reverse buckles were arranged outward, and the inward reverse buckle was 6 mm away from the product groove. M24 can accurately predict the changes in stress-strain during the tensile process of PET materials. The number and arrangement of reverse buckles are the main factors affecting the pressure bearing capacity of trays. Samples made after modifying the tray structure based on the orthogonal validation results pass the pressure test.
Key words
PET tray /
pressure simulation for trays /
structural optimization /
orthogonal validation
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