A method for measuring strain during plastic processing of metal materials
A metal material and plastic processing technology, applied in the field of material testing, can solve the problems of fast analysis process, damage measurement materials, and complicated steps, and achieve the effect of convenient operation, less consumables, and high accuracy
Inactive Publication Date: 2018-05-15
SHANGHAI INST OF TECH
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Problems solved by technology
[0004] The purpose of the present invention is to solve above-mentioned deficiency and provide a kind of new measuring method of strain in the metal material plastic processing process, the measuring method of this strain has solved the complicated method step of measuring the strain in the material processing process in the prior art , as well as technical issues that can damage the measurement material, and the analysis process is fast, low energy consumption, and less consumables
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Embodiment 1
[0044] A method for measuring strain during plastic processing of metal materials, specifically comprising the steps of:
[0045] (1) First measure the specific volume of the metal material to be tested:
[0046] First cut the pressure-processed metal material to be tested into several samples with a mass greater than 1g according to different parts, and measure the specific volume, and then measure the specific volume of the metal material to be tested before pressure processing (annealed state);
[0047] The used instrument of quality measurement in this embodiment is CP153 type electronic digital balance, and the sensitivity is 10 -3 g, the relative measurement accuracy of an object with a mass of 10g can reach 0.01%;
[0048] The material to be analyzed and tested is a deformed aluminum alloy with a grade of 6XXX. The purpose of the analysis is to measure the distribution of the internal strain of the material after press processing (upsetting). The original sample is a ...
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The invention relates to a method for measuring strain in a metal material plastic working process. The method comprises the following steps: a portion of to-be-tested metal materials which have been subjected to pressure processing is selected to be cut, the specific volume of a to-be-tested sample which has been cut into blocks is measured, then the specific volume of the to-be-tested metal materials before pressure processing or the specific volume of the metal materials in an annealing state is measured; strain of the corresponding portion of the to-be-tested metal materials is calculated according to the measured specific volume; measurement is carried out on the different positions, which have been cut, of the processed to-be-measured metal materials, and the strain of the different positions of the to-be-measured metal materials is calculated according to the specific volume values of the different positions, thereby obtaining strain distribution of the metal materials in the processing state. According to the invention, compared with methods in the prior art, the method of invention is simple in sample preparation, convenient to operate, quantified in experiment result, high in data precision, high in repeatability, and reliable in data, share the same measuring instruments with the methods in the prior art, and can be applied to measurement of strain of all the materials which allow pressure processing and which are without phase changing in the processing process.
Description
[technical field] [0001] The invention belongs to the technical field of material detection, in particular to a method for measuring the strain in the plastic processing process of metal materials, which can measure the strain distribution status of different parts of the metal materials. [Background technique] [0002] Plastic processing is an important means of material processing, which can shape the material, in addition to improve the compactness and uniformity of the internal structure of the material, and ultimately improve the quality of the product. Strain analysis is the basis for the analysis of internal structure and performance changes of materials. The distribution law can be obtained by measuring the strain, which is one of the keys to study the deformation of materials, and has important practical value and theoretical significance. [0003] At present, the commonly used strain measurement methods are: grid method, screw method, hardness method, comparative ...
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IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 陈锟吴新猛刘克家陈惠芬
Owner SHANGHAI INST OF TECH