Abstract
A multidimensional loading device for the material mechanical test based on Stewart Platform was proposed and manufactured in this paper. A determination method of mechanism parameters toward specific engineering requirements was analysed via inverse kinematics and contact interference boundary condition of mechanism components. A set of optimized mechanism parameters was achieved and then the pose space was obtained. Meanwhile, five repeated quasi-static standard tensile tests were performed on the multidimensional loading device and the standard tensile testing machine, respectively. The average yield strength and ultimate strength of the specimen achieved from the different testers were both merely 1.13%. Results indicated that material mechanical multidimensional loading could be conducted by the parallel mechanism.
Highlights
To guarantee engineering structure or machinery working in order, components should possess enough capacity to bear the loads on them [1]
Five repeated tensile tests were conducted on the multidimensional loading device (MLD) and the standard tensile testing machine Zwick Z100 according to the Chinese national standard GB/T 10128-2007, respectively
Aiming at the defects of the traditional material testers, on which the more general loads could not be applied, a new material mechanical MLD based on the parallel mechanism was proposed
Summary
To guarantee engineering structure or machinery working in order, components should possess enough capacity to bear the loads on them [1]. Mechanics of material mainly focuses on deformation, force, and failure analysis. It provides related theory for optimizing component design, such as strength, stiffness, and stability [2]. Majority of formulas in mechanics of material were derived from mechanical tests and were established with many hypotheses and simplifications. Yield strength derived by Von Miss were 15% greater than that obtained by Tresca in the pure torsional experiment [3]. Many failure analyses, in practical application, could not be conducted by theoretical calculation [4]. Multidimensional loading experiments that are more in line with the practical engineering application were rarely performed. The main reason that these experiments were not conducted was the lack of multidimensional loading device (MLD) [9]
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