Prediction model of effective tensile strength of porous materials based on energy method
The porous materials with different defect is simplified as a hollow sphere.Based on the basic knowledge of elastic mechan-ics,the relationship between the limit strain energy density of porous materials with different defect contents and the material matrix is es-tablished by using the energy method,the tensile strength of porous materials with different defect contents is derived by combining the as-sumption of failure and the criterion of maximum tensile stress.Considering the influence of pore size distribution,the influence coefficient of pore size structure is used to modify the prediction model of tensile strength.The prediction model was compared with the experimental results and the classical strength prediction model for porous materials,and the influence of Poisson's ratio and pore size distribution on the strength of porous materials was analyzed.The results show that the predicted values of the tensile strength model established are in good a-greement with the experimental results.When the effect of pore size distribution is not considered,the model is in good agreement with the classical model,and the extent of influence of Poisson's ratio on the resistance strength increases with the increase of porosity.The tensile strength is affected by both total porosity and pore size distribution,and decreases with the increase of porosity.
porous materialstensile strengthenergy methodhollow ballporositypore size distribution
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