Jianxun Zhang

Bio: Jianxun Zhang is an academic researcher from Nanjing University of Aeronautics and Astronautics. The author has contributed to research in topics: Yield (engineering) & Core (optical fiber). The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Low-velocity impact of clamped slender rectangular sandwich tubes with metal foam core

Abstract: The main purpose of this work is to investigate the yield criterion and dynamic response of fully clamped slender rectangular sandwich tubes with metal foam core struck by a low-velocity heavy mass...

Metal Foams A Design Guide

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The energy absorption of long origami-ending tubes with geometrical imperfections

Abstract: A novel origami-ending tube, which features the origami patterns at the ends, can deform in the diamond mode with an outstanding energy absorption performance. However, many quasi-static axial crushing experimental results showed that the long origami-ending tubes with two modules could deform in the corner symmetric mode and the mixed mode. Thus the SEAs were reduced by up to 38% and 25% compared to the diamond mode. The experimental and numerical results revealed that the local buckling and the initial concave imperfections were the main reasons triggering the corner symmetric mode and the mixed mode, respectively. The imperfection analysis indicated that the opposite local buckling imperfection and opposite concave imperfection had the greatest influence on the collapse mode and the SEA. Therefore, the reinforced metal sheets and slight convex creases were introduced into the tube to reduce the imperfection sensitivity and to improve the stability of deformation. Numerical simulations and quasi-static experiments validated that the performances of the reinforced tubes had been greatly improved in terms of energy absorption and imperfection resistance. Additionally, a simple manufacturing process was proposed, which is hopeful to achieve the mass production of long origami-ending tube.

Plastic behavior of circular sandwich tubes considering the effect of local denting

Abstract: In this paper, the plastic behavior of fully clamped circular sandwich tubes with metal foam core under transverse loading is analytically, experimentally and numerically studied. Considering the strength of the filled foam, the yield criterion of the compressed sandwich tube is proposed. Using the yield criterion, an analytical model for the plastic behavior of the fully clamped circular sandwich tube is proposed, in which the effects of local denting and the interaction of bending and stretching are considered. The bending experiment of clamped circular sandwich tubes is conducted. The load–deflection and energy–deflection relations are obtained by numerical calculation for the sandwich tubes at different loading positions. The analytical results are in good agreement with numerical and experimental results. Finally, the influences of foam strength, tube-wall thickness, loading position and radius of inner tubes on the plastic behavior of sandwich tubes are studied based on the analytical model.

Lateral plastic behaviour of rectangular sandwich tubes considering local denting

Abstract: In this paper, the theoretical and numerical research on large deflection of slender metallic foam-filled rectangular sandwich tubes loaded quasi-statically at midspan considering local denting is presented. The yield surface equation of the dented sandwich cross-section is derived. An analytical solution of the plastic behaviour of the fully clamped metallic foam-filled rectangular sandwich tube is proposed considering local denting. The finite element (FE) simulation is conducted and numerical results agree well with analytical ones. Based on the analytical model, influences of punch width as well as other geometrical and material parameters on quasi-static load-carrying capacity and energy absorption are discussed. It is demonstrated that the load of the punch and absorbed energy of the sandwich tube both become larger with the increase of punch width, the increase of metallic foam strength and the decrease of the ratio of metallic foam thickness to wall thickness.