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哈尔滨工业大学大学硕士学位论文
哈尔滨工业大学大学硕士学位论文
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Abstract
Sandwich structures with lattice cores are promising in engineering application due to their high porosity, specific stiffness and strength. Traditional lattice materials failed in an inefficient way which cannot fully exhibit the potential of these materials. Therefore, in the present study, we developed a new structure named truss-like lattice sandwich and studied in the following three aspects.
Firstly, in order to realize the maxmium structural carrying capacity under
shear-loading, optimization was carried out to select the optimal parameters. Based on theoretial models for each failure modes, we programed the destructive conditions with MATLAB tool and obtained the optimal parameters by assuming that all the failure modes happened at the same time.
Secondly, we analyzed the stress fields of the optimized lattice sandwich structure under shear loading with ABAQUS. Also, structures with defects were simulated and compared. Then we found that the defects had little effect on the structure’s stress fields. By using the cohesive element as simulating the bonding between face sheets and the truss cores, the strength values were obtained for structures with and without defects. It was found that debonding and cells missing would directly affect the shear strength, and location of the defects was also proved to be important for this effect.
Lastly, similar modeling was applied to investigate the mechanical behavior of the above truss-like lattice structures with typical defects in three-point bending and end compression. In three-point bending, the structures beared shear deformation and the effect of debonding on structure’s stress filed was greater relative to other defects. While for a buckled structure in end compression, all the defects had little effect for the stress field.
Keywords: Truss-like lattice sandwich, optimization, unit cell, failure, FEA, defect
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目录
摘 要 I
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