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In this paper a new theory of efective mechanical properties of foam materials is proposed.A cell volume distribution coefcient is introduced to modify the original Gibson-Ashby equations of efective mechanical properties of foam materials.The constants that influence the efective modulus are replaced by the coefcient.Based on the modified distribution coefcient,the yield stress is also recalculated.Using X-ray microtomography,the internal structures of different samples of polypropylene-nanoclay foam are obtained.The cell volume distributions of these samples are derived from the experiment by image analysis and the fitting curves are plotted.The distribution coefcient is acquired using the parameters from the theoretical model of the distribution curves.The results of the improved theory are compared with the experimental values and show good fitting quality.It was found that the precision of the improved theory is high and the cell volume distribution has an impact on the efective mechanical properties that would lead to the optimization of the synthesis procedure.
In this paper a new theory of efective mechanical properties of foam materials is proposed. A cell volume distribution coecient is introduced to modify the original Gibson-Ashby equations of efective mechanical properties of foam materials. Constants that influence the efective modulus are replaced by the coefic. Based on the modified distribution coefcient, the yield stress is also recalculated. Using X-ray microtomography, the internal structures of different samples of polypropylene-nanoclay foam are obtained. the cell volume distributions of these samples are derived from the experiment by image analysis and the fitting curves are plotted. The distribution coecient is acquired using the parameters from the theoretical model of the distribution curves. The results of the improved theory are compared with the experimental values and show good fitting quality. It was found that the precision of the improved theory is high and the cell volume distribution has an impact on the efective m echanical properties that would lead to the optimization of the synthesis procedure.