Fabrication method for compact tension specimen used for performance testing of material

A technology for compact tensile specimens and material properties, applied in the preparation of test samples, etc., to achieve the effect of ensuring accuracy

Inactive Publication Date: 2015-12-16
四川航天谦源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the groove width processed by this method is always about 0.7mm different from the required groove width, which cannot meet the needs at all.

Method used

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  • Fabrication method for compact tension specimen used for performance testing of material
  • Fabrication method for compact tension specimen used for performance testing of material

Examples

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Embodiment 1

[0023] Such as figure 1 As shown, for a compact tensile sample used in a nuclear reactor pressure vessel, the shape of the sample body 100 is a cuboid, and the upper surface 110 of the sample body 100 is vertically opened with a narrow width that runs through the front and back of the sample body 100. The deep groove 120 on the surface, the deep groove 120 includes a straight groove part 121 and a sharp corner part 122 at the bottom of the straight groove part 121, the straight groove part 121 has a design between the left side 130 and the right side 140 of the sample body 100 The left straight wall 121a and the right straight wall 121b are left and right symmetrical with respect to the central line 150 between them. The upper end of the wall 122b is connected to the left straight wall 121a and the lower end of the right straight wall 121b respectively, and the lower end of the left inclined wall 122a is connected to the lower end of the right inclined wall 122b through a fill...

Embodiment 2

[0035] Example 2 On the basis of Example 1, the link of coarse grinding of deep grooves is simplified as follows: choose the NORTON grinding wheel (model WA80-LV-Φ200*6*Φ31.75) of the French Saint-Gobain Group and grind it , the left-right symmetrical grinding method is adopted, the actual thickness of the first grinding wheel after grinding is 0.03 to 0.07mm narrower than the designed groove width, and the actual angle at the sharp corner of the first grinding wheel is the design included angle between the left inclined wall and the right inclined wall Within the range of ±2°, the actual radius of the outer fillet at the tip of the sharp corner of the first grinding wheel is within the range of ±0.05mm from the design radius of the inner fillet; then use the first grinding wheel to roughly grind the straight groove portion 121 and the sharp corner part 122, during rough grinding, the left-right symmetrical centerline of the first grinding wheel is kept coincident with the cent...

Embodiment 3

[0037]Example 3 On the basis of Example 2, step d of the fine grinding deep groove link was repeated three times. The second grinding wheel model used for the first time was WA120-LV-Φ200*6*Φ31.75. The model of the second grinding wheel used is WA180-LV-Φ200*6*Φ31.75, the model of the second grinding wheel used for the third time is WA240LV-Φ200*6*Φ31.75, that is, the particle size of the second grinding wheel used for the above three times is from 120#-180#-240# decrease in turn. Adopt the method of embodiment 2 to trial-manufacture 120 compact tensile samples, the qualified rate of the product reaches 100%, and the actual radius of fillet 122c of more than 90% of the samples reaches R0.05±0.015mm, and the groove depth D reaches 14.275± 0.015mm, which better guarantees the dimensional accuracy at the fillet 122c.

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Abstract

The invention discloses a fabrication method for a compact tension specimen used for performance testing of a material. The method comprises the following steps: 1, coarse grinding of a deep groove: a, selecting a first grinding wheel with a hardness in a range of grade L to grade N, grinding the first grinding wheel in a left-and-right symmetrical grinding manner, wherein the actual thickness of the ground first grinding wheel is 0.02 to 0.12 mm smaller than designed width of the groove, and then coarsely grinding a straight groove part with the first grinding wheel; and b, carrying out secondary grinding on the first grinding wheel in the left-and-right symmetrical grinding manner and coarsely grinding a sharp-angled part with the first grinding wheel; and 2, fine grinding of the deep groove: c, selecting a second grinding wheel with a hardness in a range of grade L to grade N, grinding the second grinding wheel in the left-and-right symmetrical grinding manner, wherein the actual thickness of the ground second grinding wheel is 0.01 to 0.025 mm smaller than the upper limit value of the designed width of the groove, and then finely grinding the straight groove part with the second grinding wheel; and d, carrying out secondary grinding on the second grinding wheel in the symmetrical grinding manner and finely grinding the sharp-angled part with the second grinding wheel. The deep groove in the specimen fabricated by using the method has high precision and ideal surface quality.

Description

technical field [0001] The invention relates to a method for manufacturing a compact tensile sample for material performance testing and a compact tensile sample for material performance testing obtained by the method. Background technique [0002] Plane strain fracture toughness K IC There are generally two kinds of specimens in the test, one is the standard three-point strain specimen (code S(EB)), and the other is the compact tensile specimen (code C(T)). The basic structure of a compact tensile test sample is known, that is, it includes a sample body generally in the shape of a cuboid, and the upper surface of the sample body is vertically opened with a deep groove with a narrow width that runs through the front and rear surfaces of the sample body. , the deep groove includes a straight groove part and a sharp corner part located at the bottom of the straight groove part, wherein the straight groove part has a left straight wall and a left straight wall designed to be s...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 周京平宁先杰杨明亮唐芦何海燕
Owner 四川航天谦源科技有限公司
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