Method and system for numerically simulating and predicting necking failure in sheet metal forming

A metal sheet, necking technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as limiting design space

Inactive Publication Date: 2011-11-30
LIVERMORE SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this approach may unnecessarily restrict the design space due to the safety limit line being significantly lower than the original FLC

Method used

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  • Method and system for numerically simulating and predicting necking failure in sheet metal forming
  • Method and system for numerically simulating and predicting necking failure in sheet metal forming
  • Method and system for numerically simulating and predicting necking failure in sheet metal forming

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Embodiment Construction

[0018] Refer here Figure 1-6 Embodiments of the invention are discussed. However, those skilled in the art will readily appreciate that the detailed description given herein with reference to these figures is for explanatory purposes as the scope of the invention extends beyond these limited embodiments.

[0019] Methods and systems for predicting material necking (eg, the onset of localized necking) during sheet forming processes are disclosed. The present invention performs a time-marching simulation using a finite element analysis model. The finite element analysis model includes shell elements representing the sheet metal formed into the desired part. To perform this prediction using finite element analysis in a computer system, a conventional strain path-dependent forming limit diagram is transformed into a path-independent FLD. The formability index for each shell element is then compiled into the time history curve in the time-marching simulation. When any formabil...

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Abstract

Systems and methods of predicting sheet metal forming failure using numerical simulations (e.g., finite element analysis) are disclosed. A FEA model is defined for a particular sheet metal forming process. Blank sheet metal is modeled with a plurality of shell elements. Additionally, a deformation path-dependent forming limit diagram (FLD) is converted to a path-independent FLD. A time-marching simulation of the sheet metal forming process is conducted using the FEA model. At each solution cycle, equivalent strain at each integration point of shell element is checked against the corresponding forming limit strain value of the path-independent FLD. The ratio of the equivalent strain and the forming limit strain is defined as formability index. A time history of the formability index of each shell element is saved into a file and displayed to a monitor upon user's instructions. When a particular element's formability index reaches one or higher, a localized necking is predicted.

Description

technical field [0001] The present invention relates to computer-aided engineering analysis, and more particularly to numerical simulation using finite element analysis to predict forming necking of sheet metal. Background technique [0002] Many metal parts are made by forming sheet metal. One of the most common sheet metal forming processes is deep drawing, which involves the use of hydraulic or mechanical presses to push a specially shaped punch into a matching die with a sheet of metal placed between the two. Exemplary products manufactured using this process include, but are not limited to, hoods, fenders, vehicle doors, automotive gas tanks, kitchen sinks, and aluminum cans, among others. In the deep drawing process, the depth of the processed part is generally more than half its diameter. Consequently, the blank is stretched and, due to the geometry of the part, will become thinner at different locations. The part is good only if there are no structural defects suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2217/42Y02T10/82G06F2217/16G06F17/5018G06F30/23G06F2111/10G06F2113/24
Inventor 朱新海张力
Owner LIVERMORE SOFTWARE TECH
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