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Method and system for establishing fracture forming limit diagram of high-strength aluminum alloy sheet

A technology of forming limit map and aluminum alloy sheet, which is applied in the direction of applying stable tension/pressure to test the strength of materials, which can solve the problems of loss of theoretical basis and validity of forming limit map.

Active Publication Date: 2019-06-11
YANSHAN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, the tensile fracture behavior of high-strength aluminum alloy sheets is different from that of ordinary steel sheets, and there is no obvious necking phenomenon before fracture
Therefore, the establishment of forming limit diagrams for this type of material based on the theory of tensile instability loses its theoretical basis and validity.

Method used

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  • Method and system for establishing fracture forming limit diagram of high-strength aluminum alloy sheet
  • Method and system for establishing fracture forming limit diagram of high-strength aluminum alloy sheet
  • Method and system for establishing fracture forming limit diagram of high-strength aluminum alloy sheet

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Embodiment 1

[0089] figure 1 It is a schematic flow chart of the method for establishing the fracture forming limit diagram of the high-strength aluminum alloy plate in the embodiment of the present invention, as shown in figure 1 As shown, the method for establishing the fracture forming limit diagram provided in Example 1 includes the following steps.

[0090] Step 101: Prepare three test samples; the test samples are respectively uniaxial tensile test samples, plane strain test samples and bidirectional iso-tensile test samples.

[0091] Step 102: Place the three kinds of test samples on the universal material testing machine to perform unidirectional tensile test, plane strain test and bidirectional isotensive test to obtain the first force-displacement curve, the second force-displacement curve and the second force-displacement curve. Three force-displacement curves; the first force-displacement curve is a curve obtained by placing the unidirectional tensile test sample on a universa...

Embodiment 2

[0125] figure 2 A schematic structural diagram of the system for establishing the fracture forming limit diagram of the high-strength aluminum alloy plate in the embodiment of the present invention, as shown in figure 2 As shown, the fracture forming limit diagram establishment system provided by embodiment 2 includes:

[0126] The test sample preparation module 100 is used to prepare three kinds of test samples; the test samples are respectively uniaxial tensile test samples, plane strain test samples and bidirectional iso-tensile test samples.

[0127] The force-displacement curve obtaining module 200 is used to place the three kinds of test samples on a universal material testing machine to perform a unidirectional tensile test, a plane strain test and a two-way equal tension test to obtain the first force-displacement curve, the second Two force-displacement curves and the third force-displacement curve; the first force-displacement curve is a curve obtained by placing ...

Embodiment 3

[0145] (1) Unidirectional tensile test

[0146] First, design the uniaxial tensile test specimen according to the national standard GB / T 228.1-2010, conduct the uniaxial tensile test on a universal material testing machine, and record the "force-displacement" curve during the test. Under the same test conditions, five sets of parallel tests were carried out, and a set of test data with better coincidence of the "force-displacement" curve was selected as the test result. According to this data, the "engineering stress-strain" curve of the test plate is obtained. Such as image 3 As shown, among the five groups of parallel experiments, the results of experiments 2, 3, and 4 are almost the same, while the results of experiments 1 and 5 are quite different compared with others, so one of experiments 2, 3, and 4 is selected as the test result. Then, on the "force-displacement" curve, select the displacement corresponding to the maximum force point as the fracture start displaceme...

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Abstract

The invention discloses a method and a system for establishing a fracture forming limit diagram of a high-strength aluminum alloy sheet, and relates to the technical field of sheet forming limit determination. The method comprises the following steps of firstly, obtaining a fracture criterion related mechanical variable comprising fracture initial strain and fracture end strain through a combination scheme of a unidirectional tensile test, a plane strain test and a bidirectional equal-tension test in the stable stress states; secondly, determining two groups of fracture parameters according tothe mechanical variable and a Lou-Huh toughness fracture criterion; and finally, computing a forming limit curve according to the two groups of fracture parameters, and drawing a fracture forming limit diagram with a fracture zone, a dangerous zone and a safety zone. According to the method disclosed by the invention, the establishment of the forming limit diagram of the high-strength aluminum alloy sheet is realized through a simple and easily-implemented test means in combination with a novel theoretical method with stronger applicability, so that the complexity of the forming limit diagramobtained by testing is avoided, the inapplicability of a traditional theory to the high-strength aluminum alloy sheet is also solved, and typical problems existing in a realization process of the novel theoretical method are also effectively avoided.

Description

technical field [0001] The invention relates to the technical field of plate forming limit determination, in particular to a method and system for establishing a fracture forming limit diagram of a high-strength aluminum alloy plate. Background technique [0002] With the continuous development of lightweight in the automobile industry, high-strength aluminum alloy sheets with advantages such as low density and high strength are widely used in automobile manufacturing. However, high-strength aluminum alloy sheets have low plasticity and poor formability. Improving the formability of this type of material is a problem that needs to be solved. At the same time, accurately predicting the forming limit of this type of material is also an important problem that needs to be solved. [0003] The forming limit diagram can predict and judge the cracking phenomenon in the sheet metal forming process, and is an important tool for analyzing the sheet metal forming performance. There ar...

Claims

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Application Information

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IPC IPC(8): G01N3/10G01N3/08
Inventor 董国疆朱良金陈光杨卓云
Owner YANSHAN UNIV
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