| Currently, the logs are the main packaing materials of mechanical and electronical productsin China. China is a country that is very short of forest resources, but every year in China, thelogs used in packaing of mechanical and electronic products account for1/6of the national totalproduction of timber, most of which are with good quality. Therefore, it is very significant forreducing the waste of the forest to use new materials like laminated veneer lumber to replace thelogs as packaging materials of mechanical and electronic products. Besides, due to the highprecision and reliability demands of mechanical and electronical products, the mechanicalproperties of their packing containers in the processes of transportation and turnover must beexcellent, so that the related researches in the mechanical properties of the packing containersmust be paid attention.In this paper, the3D geometric models of the components and assembly of the packingcontainer of a product from a company in Nanjing was created in Pro/ENGINEER with thedimensions by the measurement. And the mechanical properties of the packing containers madeof different materials (the deal and the poplar LVL) in the working condition of stacking wereanalysed based on the theory of material mechanics and the software of FEA (ANSYS), fromwhich two conclusions can be drawed easily. Firstly, FEA is an efficent way to analyse themechanical properties of the packing containers because the relative error betwwen the resultsthat were calculated based on the theory of material mechanics and ANSYS is very small, andthe maximum and minimum relative errors are12.189%and0.102%. Secondly, the mechanicalproperities of the packing container made of the poplar LVL in the working condition of stackingcompletely meet the application requirements, so that the poplar LVL can be totally used toreplace the logs as the material of the packing containers.In addition, the modal analysis that could lay a foundation for the subsequent analyses of themechanical properties of the packing container in the working conditions of vibration, shock andthe others was simulated in ANSYS, from which the inherent frequencies and modal shapes ofthe packing container could be obtained. And the result shows that the resonance of the packingcontainer easily occurs with the actions of external incentives because its first ten inherentfrequencies are all less than30Hz and the frequencies of the external incentives are usually lessthan25Hz, so that it is essential to take some measures to avoid the resonance of the packingcontainer occuring in some working conditions.Finally, the optimum designs of the sleeper and the carling in the chassis of the packingcontainer were carried out with ANSYS, which is very helpful to reduce the use of timbereffectively in the premise of ensuring the rigidty of the packing container. The section width andheight, the maximum deflection and the total volumes of the original sleeper are0.12m,0.02m,4.441×10-3m and3.504×10-3m3and the section width and height, the maximum deflection and the total volumes of the optimized sleeper are0.044m,0.032m,3.086×10-3m and2.065×10-3m3.Though the section height of the optimized sleeper is60%time bigger than before, the sectionwidth, the maximum deflection and the total volumes of the optimized sleeper are63.333%,30.511%and41.067%time smaller than before. Moreover, the section width and height, themaximum deflection and the total volumes of the original carling are0.170m,0.150m,3.389×10-3m and0.127m3and the section width and height, the maximum deflection and thetotal volumes of the optimized carling are0.148m,0.158m,3.370×10-3m and0.116m3. Thesection height of the optimized carling is5.333%time bigger than before, but the section width,the maximum deflection and the total volumes of the optimized carling are12.941%,0.561%and8.661%time smaller than before. |
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