In order to study the forming quality of AlSi10Mg powder for SLM process without supporting structure, as well as lay the foundation of subsequence structural design of Aluminum SLM technique, a series of typical coupons have been designed and printed. Based on comprehensive consideration of layout direction, overhang angle, hole size, etc., Xline 2000R with optimized process parameter has been used as SLM equipment for AlSi10Mg powder. Through the analysis of printed coupons, the beneficial conclusion is made which can be used to guide future design, especially for the structure with complex shape.
This paper presents an invertebrate leg-like mechanism, which is biologically inspired from invertebrate creatures such as crabs and insects. For the purpose that the leg mechanism could imitate the behavior of the invertebrate animal on rough terrain, it should have the same degree of freedom as the crabs or insects have. The novel leg mechanism consists of 3 joints which linkage has 5 degrees of freedom (DOFS), and mainly depends on a coxa joint driven by a parallel mechanism for the biomimetic motions. The parallel mechanism with 3 DOF is well designed and implemented with the excellent kinematical performances as invertebrate creatures. The mathematical model of the leg mechanism and the kinematical analysis are described, and static force performance characteristics are also discussed. The kinematical performances of the leg mechanism are analyzed by the numerical simulation conducted in biomimetic robots application. The simulation results show the performance of the proposed leg-like mechanism and verify that the leg can be used in the biomimetic robot which could exactly imitate limb motions.
V-shape adapter is one of the most used hollow adapter in submarine-lunched missile, studying on influence of mechanical property of adapter on submarine-launched performance has an important significance. Firstly, mechanical analysis on V-shape adapter is done and the equivalent out-of-plane mechanical property of adapter is obtained. Secondly, the equivalent constitutive model is built and the user subroutine VUMAT is developed based on ABAQUS/Explicit, while the stability and reliability of the calculation results are verified. According to the requirements of adapter performance from submarine-lunched missile, optimization design for adapter is carried out. The results show that the equivalent constitutive model can simplify the simulation of adapter and shorten the engineering time in research, and the optimized adapter can have a good effect on vibration reduction and supporting based on some relevant conditions.
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