Thick-walled hollow cylinder is an important class of engineering structure, the stress state of which depends on the loads and properties of the body materials. Under the assumptions of σθ-σr=c (σθ and σr denote the hoop stress and radial stress, respectively, c is a constant), inverse analysis of thick-walled hollow cylinder composed of functionally graded materials with uniform pressure acting on the outer surface is carried out. Analytical solutions for the Young’s modulus variation in the radial direction are obtained. It is found that only when the Young’s modulus E(r) is a specific monotone increasing function of the radius r, the pre-specified stress distribution can be satisfied. Comparing with classical homogeneous materials, stress concentration at the inner surface of hollow cylinder composed of functionally graded materials can be alleviated. Hence the elastic ultimate bearing capacity of hollow cylinder can be improved strikingly. For functionally graded materials, the elastic ultimate bearing capacity can be improved strikingly by increasing the thickness of cylinder, which is not so obvious for classical homogeneous materials.
Functionally Graded Material (FGM), as a new concept in material fields, has been a research hotspot in recent years, the application of which can improve the stress state of structures. This paper tried to introduce FGM into the concrete material by investigating the factors which have influence on the concrete FGM. In this study, mix proportion parameters of haydite concrete are analyzed by using the Taguchi’s experiment design methodology. Mixtures are designed in a L16 (45) orthogonal array with three factors, namely, “volume fraction of haydite in total aggregate (H/A)”, “water/cementitious material (W/C) ratio”, and “air entraining agent (AE) content”. The mixtures are extensively tested. The experimental results are analyzed by using the variance analysis (ANOVA). The influence degree of three selected factors to performance indexes is obtained.
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