Testing device and testing method for forming limit diagram under high-temperature constant-strain rate condition

A technology of constant strain rate and forming limit diagram, which is applied in the direction of applying stable tension/compression to test the strength of materials, so as to eliminate the strain rate factor and facilitate research
CN104729928AInactive Publication Date: 2015-06-24JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JILIN UNIV
Publication Date
2015-06-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a testing device and a testing method for a forming limit diagram under a high-temperature constant-strain rate condition. The device comprises a sample deformation pressure device, a real-time strain measurement device and a controller; based on a testing method for the forming limit diagram under the high-temperature constant-strain rate condition built by the testing device, the constancy of the strain rate of a sample in a central point is realized under the condition of constant forming temperature, and a forming limit diagram under the obtained slab isothermal condition contains a forming limit curve under a constant-strain rate condition in a certain strain rate range. The testing device and the testing method have the advantages of high control accuracy and accuracy in measurement, and are significant in theoretical research and practical application of light alloys and high-strength steel warm-hot forming.
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Description

technical field

[0001] The invention relates to a test device for the formability of a metal plate, in particular to a test device and a test method for a forming limit diagram under the condition of high temperature and constant strain rate. Background technique

[0002] At present, the world is facing the pressure of energy shortage and environmental pollution. Lightweight is the main trend of automobile development. It is gradually shifting from traditional steel plates to high-strength steels, light alloys and other lightweight materials for automobile body and chassis components to reduce automobile weight. As a result, some emerging sheet forming processes have been born, such as superplastic forming (SPF), rapid plastic forming (QPF), warm stamping (WSF) of aluminum alloy and magnesium alloy sheets, and the development of high-strength steel sheets in recent years. Hot Stamping Forming (HSF), etc. The common feature of these processes is that the sheet is formed in a...

Claims

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