Method for determining plastic forming limit of sheet material based on finite element calculation analysis

A technology for thin plate materials and determination methods, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of complex experimental operation, large consumption of manpower and material resources, long test time, etc., to improve efficiency, reduce experimental costs, The effect of shortening the period of the experiment

Active Publication Date: 2019-01-29
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

However, determining the forming limit of materials through experiments often faces disadvantages such as co

Method used

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Embodiment Construction

[0021] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0022] (1) Obtain the stress-strain curve of the thin plate material through the flat tensile test, and then obtain the elastic modulus, Poisson's ratio, yield strength and the stress-strain correspondence relationship after yielding of the thin plate material through the stress-strain curve, and adopt the following The formula converts experimentally obtained engineering stress-strain values ​​to true stress-strain values.

[0023] σ T =σ(1+ε)

[0024] ∈ T =ln(1+ε)

[0025] where σ T true stress, ∈ T is the true strain, σ is the engineering stress, and ε is the engineering strain.

[0026] (2) In the finite element software, according to the actual size of the forming experiment syste...

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Abstract

The invention provides a method for determining plastic forming limit of sheet material based on finite element calculation analysis. The method of the invention comprises the following steps: (1) obtaining the elastic modulus, Poisson's ratio, yield strength and post-yield stress of the sheet material Strain correspondence; (2) establishing the geometrical models of punch, concave die, blank holder and sample; (3) adding the corresponding material properties and setting the corresponding friction coefficient in the material model of the finite element software; 4) determining that applied load accord to the actual downward pressure amount and downward pressure of the blank holder ring; (5) controlling the downward pressing displacement of the punch, that is, the downward pressing amount;(6) meshing the sample; (7) defining the calculation time; (8) obtaining the results of stress-strain evolution in a sample forming experiment, and outputting the stress-strain nephogram of all the units; (9) using S-G filter to perform first and second order fitting on main strain. The invention provides reliable judging basis and criterion for obtaining accurate results of sheet metal stamping forming.

Description

Technical field: [0001] The invention relates to a method for determining the plastic forming limit of a thin plate material based on finite element calculation and analysis, and belongs to the technical field of plastic forming characterization. Background technique: [0002] Sheet metal stamping forming processing technology has a wide range of applications, and it accounts for a considerable proportion in various industrial sectors of the national economy, such as automobiles, aviation, electrical machinery, electrical appliances, instruments, railways, telecommunications, chemicals, and light industry daily products. Stamping production mainly uses stamping equipment and molds to realize the processing of metal materials. It has the outstanding characteristics of material saving, energy saving, low cost, and high production efficiency. Therefore, stamping production occupies an important position in the manufacturing industry. The early research methods of metal plastic ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2113/24G06F30/23G06F2119/06
Inventor 刘友荣张玉才金澜朱坤
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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