Real-time detecting device and method applied to sheet three-point bending performance test
A three-point bending, real-time detection technology, applied in the direction of using a stable bending force to test the strength of materials, measuring devices, analyzing materials, etc., can solve problems such as increasing the time and cost of the test, increasing the complexity of the equipment, and increasing the difficulty of the test. , to achieve the effect of fast heating, reduced test time and high test efficiency
Inactive Publication Date: 2016-01-20
SHANGHAI JIAO TONG UNIV +1
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Problems solved by technology
However, this technology opens observation holes on the furnace wall of the high-temperature heating furnace, which increases the complexity of the equipment and increases the difficulty of the test, and because the entire set of bending molds needs to be heated, the heating rate is slow, which increases the time and cost of the test
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Embodiment 1
[0031] Such as figure 1 As shown, this embodiment includes: a test sheet 7, a real-time observation system, an electric heating system, and a three-point bending mold arranged on a press, wherein: the test sheet 7 is placed in a three-point bending mold, and the electric heating system passes through The large current-carrying wires 13 are connected to the two ends of the test plate 7 respectively.
[0032] The three-point bending mold includes: a guide post 12, an upper mold module and a lower mold module arranged in parallel, wherein: one end of the guide post 12 is in contact with the upper mold module, and the other end is vertically fixed on the lower mold module.
[0033] The upper part of the guide post 12 is provided with a guide sleeve 11 slidingly fitted with the guide post 12 , and the guide sleeve 11 is in contact with the upper mold base 1 .
[0034] The upper die module includes: an upper die base 1, an upper insulating sheet 3 arranged below the upper die base ...
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The invention provides a real-time detecting device and method applied to a sheet three-point bending performance test. The real-time detecting device comprises a three-point bending mould, an electrical heating system and a real-time observation system, wherein a to-be-tested sheet is placed in the three-point bending mould, the electrical heating system directly heats the to-be-tested sheet to be at a preset test temperature, the real-time observation system collects images when the three-point bending performance test of the to-be-tested sheet is carried out under convex dies with different fillet radiuses, and according to a dichotomy iterative test, the minimum bending radius when the to-be-tested sheet generates a crack is determined. The invention has the advantages that a high-energy pulse power supply directly heats the to-be-tested sheet, so that the heating speed is high; due to reasonable combination of a light supplementing lamp and a plane mirror, the generation of microcracks on bending surfaces can be clearly observed in real time; by adopting the dichotomy test, the testing times is largely reduced, and the test efficiency is high.
Description
technical field [0001] The invention relates to a technology in the field of material mechanical performance testing, in particular to a real-time detection device and method for three-point bending performance testing of sheet metal. Background technique [0002] The three-point bending test is a commonly used experimental method for testing the bending mechanical properties of materials, that is, using punches with different fillet radii to bend the sheet into a shape with a specified angle, and observing whether there are cracks on the outer surface of the deformation zone, and the minimum number without cracks The radius is used as the evaluation index of bending performance. In order to eliminate the influence caused by the inconsistency of the actual thickness of the material, the relative bending radius is generally used to evaluate the bending performance of the material, that is, the ratio of the radius of the bottom arc surface of the bending punch to the actual th...
Claims
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IPC IPC(8): G01N3/20G01N3/06G01N3/02
Inventor 李细锋李佼佼陈军贾敬华曹旭东叶福田
Owner SHANGHAI JIAO TONG UNIV