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.
Highlights
Material science, as the leading discipline for all advanced technologies, represents the foundations of the national economy
With regard to the above-mentioned problems, this paper presents a design proposal on modular test apparatus compatible with SEM or CCD for in situ tensile-bending-combined load at nanoscale, and introduces every component and function of the test apparatus
Finite element simulation analysis was conducted for the mechanical performance of the cross-shaped specimen under bilateral tension and tensile-bending-combined loading
Summary
As the leading discipline for all advanced technologies, represents the foundations of the national economy. An in situ tensile-bending test is usually used to observe and record the whole process including material crack initiation, propagation and fracture in real time Under normal conditions, such testing is carried out under a high-resolution electron microscope. Deformation of the specimen and strain distribution in two-way tensile and tensile-bending-combined conditions was analyzed by finite element simulation to obtain a range of reasonable structure sizes In this design proposal, analysis and processing of the specimen size and test data were properly studied to ensure accuracy of the test result. Analysis and processing of the specimen size and test data were properly studied to ensure accuracy of the test result Problems such as scattered test results that exist in in situ tensile-bending test apparatus, as well as limitations in the single load test on bulk material at and above millimeter scale, could be solved
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