Method for measuring yield strength of non-planar structure material

A technology of structural materials and yield strength, which is applied in the field of material testing to achieve the effect of eliminating influence

Inactive Publication Date: 2012-12-26
BEIJING LONGSHINE OIL TUBULAR TECH
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Problems solved by technology

In addition, because this operation does not clearly specify the value and degree of preload, the yield strength R of the material is measured in this way. t0.5 It will be affected by the operating habits of different operators, and the actual value obtained may be the stress value corresponding to the gauge length greater than 0.5% strain in the gauge range, rather than the desired R t0.5

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  • Method for measuring yield strength of non-planar structure material
  • Method for measuring yield strength of non-planar structure material

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[0019] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] Such as figure 2 Shown is a method for measuring the yield strength of a non-planar structural material, comprising the steps of:

[0021] The first step is to directly load the tensile sample (without preload) to perform a tensile test to obtain a complete tensile test curve;

[0022] In the second step, a straight line is determined by fitting the two points corresponding to 1 / 5 of the maximum load and 1 / 2 of the maximum load on the tensile test curve, and confirming that the straight line is the slope line of the proportional extension section of the tensile ...

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Abstract

The invention relates to a method for measuring yield strength of a non-planar structure material. The method comprises: 1, manufacturing a tension specimen, clamping the specimen in a tension testing machine, clamping an extensometer on the tension specimen, and setting the extensometer to zero; 2, directly loading on the tension specimen to carry out a tension test to obtain a complete tension test curve; and 3, selecting two points from a proportion extension section as base points, adopting the two points to obtain a straight line, adopting an intersection point of the straight line and a abscissa as an origin, adopting the origin as a benchmark to rightward find a strain point of 0.5% specimen gauge length on a strain shaft, wherein a load value corresponding to the strain point is a conditional yield load corresponding to 0.5% strain, and the yield strength of the material can be measured according to the yield load and the specimen size. With the method of the present invention, influence on measurement of the yield strength Rt0.5 of the material by roughness of the specimen can be eliminated, and the unique yield strength Rt0.5 value can be accurately, reliably and repeatedly measured.

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a method for measuring the yield strength of non-planar structural materials. Background technique [0002] The yield strength of the material (such as R t0.5 ) is one of the most important indicators to characterize the mechanical properties of materials. For non-planar structural materials (such as steel pipes), in the preparation of tensile specimens, the specimens must be flattened by slow loading, so that the specimens obtained cannot be in an ideal plane. During the test, after clamping the extensometer, operate according to the conventional tensile test method, and obtain the strain-load curve measurement as figure 1 shown. The starting segment in the curve (similar to figure 2 In paragraph a), because the sample is not completely flattened (it is bent to a certain extent), a large strain is generated under a small load. At this time, if the directly obtaine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/06
Inventor 李记科吴金辉杨红兵李云龙张鸿博王长安杨专钊
Owner BEIJING LONGSHINE OIL TUBULAR TECH
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