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Metal material stress-strain curve measuring method and metal material stress-strain curve use method

A technology of metal materials and strain curves, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve problems such as warping at the end of the curve, wrong selection of materials, misleading material organization and performance changes, etc.

Inactive Publication Date: 2013-12-25
BEIJING RES INST OF MECHANICAL&ELECTRICAL TECH
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Problems solved by technology

[0007] However, this error caused by friction is not the main reason for the above-mentioned tail warpage, and this explanation method can not solve the problem of curve tail warpage in high-temperature experiments, and also misleads the relationship between the structure and the material during thermal processing. The law of performance changes, that is, the use of wrong error parameters to correct the true stress-strain curve obtained in experiments, which will lead to wrong selection of materials in engineering, or wrong process parameters in processing technology

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  • Metal material stress-strain curve measuring method and metal material stress-strain curve use method

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Embodiment Construction

[0034] Based on the warping of the tail of the stress-strain curve found in the existing simulation experiments at high temperatures, the prior art attributed it to the increased load caused by friction. According to this, the applicant evaluates the friction factor during a large number of experiments, and only some of the tests are given as examples below. The purpose is that the law cannot be obtained under a small amount of data, and the present invention is the law obtained through a large number of experiments. , just for the convenience of description, based on the obtained rules, in turn use the following small amount of data as verification. It should be noted here that the simulation at high temperature usually refers to the temperature higher than the recrystallization temperature of metal materials and lower than the solidus. The required temperature is greater than 1200°C.

[0035] Specifically, according to common sense, the coefficient of friction of metals is ...

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Abstract

The invention provides a metal material flow stress curve measuring method. The metal material flow stress curve measuring method comprises the following steps of A, detecting variation of a strain rate in a high-temperature metal material uniform-compression experiment carried out by a testing machine, B, constructing a three-dimensional curve function comprising an x-axial true strain curve, a y-axial strain rate curve and a z-axial true stress curve, and C, carrying out interpolation on the three-dimensional curve function obtained by the step B to obtain a stress-strain correction curve. The invention also provides a metal material stress-strain curve use method. The three-dimensional curve of true strain and true stress at a true strain rate is constructed and through interpolation, strain rate-caused influence is further eliminated and the stress-strain correction curve is obtained and thus the influence caused by strain rate increasing in compression on stress-strain curve warping is reduced under the conditions of the existing testing machine precision and the existing control system so that the stress-strain curve is approximate to true.

Description

technical field [0001] The invention relates to a physical simulation technology in the field of materials and thermal processing, in particular to a method for measuring and applying metal material stress-strain curves. Background technique [0002] In the high-temperature forging production of metals, the high-temperature deformation law of metal materials, that is, its stress-strain curve, can be formulated in advance to formulate the correct forging process, process according to different deformation conditions, and forge high-precision products. [0003] On the other hand, when products made of metal materials are used for specific purposes, such as bearings and engines for high-speed trains, their working conditions are high temperature and high stress. Therefore, how to choose metal materials for making such products , It is also necessary to understand its stress-strain curve. Only after understanding the stress-strain curve of the material can the product made of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
Inventor 翟月雯钟志平边翊
Owner BEIJING RES INST OF MECHANICAL&ELECTRICAL TECH
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