Research on Design and Simulation of Biaxial Tensile-Bending Complex Mechanical Performance Test Apparatus

Abstract

In order to realize a micro-mechanic performance test of biaxial tensile-bending-combined loading and solve the problem of incompatibility of test apparatus and observation apparatus, novel biaxial-combined tensile-bending micro-mechanical performance test apparatus was designed. The working principle and major functions of key constituent parts of test apparatus, including the servo drive unit, clamping unit and test system, were introduced. Based on the finite element method, biaxial tensile and tension-bending-combined mechanical performances of the test-piece were studied as guidance to learn the distribution of elastic deformation and plastic deformation of all sites of the test-piece and to better plan test regions. Finally, this test apparatus was used to conduct a biaxial tensile test under different pre-bending loading and a tensile test at different rates; the image of the fracture of the test-piece was acquired by a scanning electron microscope and analyzed. It was indicated that as the pre-bending force rises, the elastic deformation phase would gradually shorten and the slope of the elastic deformation phase curve would slightly rise so that a yield limit would appear ahead of time. Bending speed could exert a positive and beneficial influence on tensile strength but weaken fracture elongation. If bending speed is appropriately raised, more ideal anti-tensile strength could be obtained, but fracture elongation would decline.

Correction: Li, H. et al. Research on Design and Simulation of Biaxial Tensile-Bending Complex Mechanical Performance Test Apparatus. Micromachines, 2017, 8, 286

“…In the published paper [ 1 ], there is an error in Figure 8 . The labels in Figure 8 was incorrect, it should be corrected as follows:…”

Development of a biaxial tensile device in the plane for monotonic mechanical tests and cruciform specimens / Desenvolvimento de um dispositivo de tração biaxial no plano para ensaios mecânicos monotônicos e de corpos de prova cruciformes

“…Several types of equipment have already been developed to generate biaxial loading, and these have been divided into two groups: standalone machines and devices to be coupled to universal machines. The autonomous machines developed will have different formats and force application systems, and may have one [13], two [14], or four hydraulic actuators [3,4,8,9,15], spindle actuators [6,10,16], electromechanical [17], manual [18,19], and a dead weight configuration [5].…”