Abstract
In this paper, the accurate in-situ measurement of plastic mechanical properties of 93 W-4.5Ni-2.5Fe alloy spheres with Φ1 mm is achieved. By the quasi-static compression experiments, the load on the sphere as functions of the displacement and the contact area were obtained. The geometry profiles of the sphere during compression varying with the increase of the load were given. The calculation results by the finite element (FE) method track the evolution of the stress field on the longitudinal section of a compressed sphere, and the stress state of the key-points during loading process, to clarify their dependency of stress state on evolving Lode parameter. The characteristics and forming mechanism of non-uniform stress field of compressed sphere were analyzed, and also the possible onset location of damage was predicted. Based on the plastic yield features of load-displacement curve, the feasibility of von Mises yield criterion for obtaining yield strength of material has been discussed. The simulation results of load-displacement curve and compressive strength are in good agreement with the experimental results, indicating that our developed simulation method based on FE can effectively predict the mechanical behavior of alloy sphere during the compression process.
Published Version
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