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FLC test  Experimental specimen The dimensions of the specimens are processed according to the relevant requirements of the national standard, as shown in Figure 3. There are nine specimens of different specifications. Three specimens of each specification are processed, and a total of 27 specimens are processed. Experimental specimen （1）Calibration of XTDIC camera parameters （2）Speckle pattern is sprayed on the surface of cup protrusion specimen （3）Spread grease on both sides of the tetrafluoro plate, place the tetrafluoro plate or fresh-keeping film on the surface of the punch,and place the cup protrusion specimen at the center of the punch. （4）Set up the XTDIC software acquisition parameters and cupping test parameters, start the cupping test machine to start the experiment, XTDIC software will automatically start to collect images according to the pre-set acquisition frequency of 5 frames/s. The XTDIC software will stop automatically after the experiment. （5）Select the calculation area, calculate the surface strain field of cup-protruding specimen in stamping process, and select three truncation lines in the first state of necking according to the requirements of national standard. （6）Repeat (1) ~ (5) to get the transversal lines of all specimens. （7）All transversal lines are imported into XTDIC parts, all parabola are automatically fitted, and FLC curves of materials are obtained. Experimental result Calculations of cupping specimens to obtain transversal line Fitting transversal line FLC curve |
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