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Abstract
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An experiment was conducted to evaluate the improvement of mechanical strength of aluminum symmetric lattice core sandwich panels in combination with their lightweight. Also, a unique design achieved to sandwich panel cores. To achieve a quantitative relationship between the strength-to-weight ratio and the input parameters, the design experiment and response surface methodology (Box-Behnken) were used. Sheet thickness, the height of the sandwich panel, and width of the seat were considered as the design variables to achieve the optimal state. Then the maximum Initial Peak Crushing Forces (IPCF) under quasi-static axial flatwise compression tests were obtained. After investigating the different models presented for maximum force and applying statistical analysis methods, it was found that the predicted values of the model were in parallel with the experimental results. Therefore, to optimize the parameters to maximize the initial peak force and minimize the weight using the optimization function, the design expert software was used. Results showed the sandwich panel height and sheet thickness had the highest impact on maximum force and panel weight, respectively. Then, genetic algorithm, NSGA2 and Lingo were used to validate the results. Also, another purpose of this research was to evaluate the agreement between experimental data and statistical analysis findings for the determination of the peak point of the mechanical strength.
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