Control Mode for Tensile Test of Metallic Materials at High Temperature and Its Selection of Testing Rates
The Method A and the Method B from the standard GB/T 228.2-2015 for tensile test of metal materials at high temperature were analyzed based on two requirements asked by control mode and testing rate.And then three aspects such as stress-strain curves,strain rate-time curves and yield strengths were analyzed by different methods and testing rates,and the analysis results were verified based on various testing rates.And thus it was concluded that Method A1 from the extensometer feedback control could produce a larger deviation on strain rates and the stress-strain curves were apt to get aberrations,which would make miscalculation on Rp0.2.While Method A2 and Method B from the beam displacement feedback control could meet the requirements asked by the standard for strain rates,which could achieve stable and reliable stress-strain curves and uniform results.
high temperature tensile teststrain ratecontrol modeyield strength
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