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Measuring scale for drop weight tear tests and method for measuring fracture surfaces of drop weight tear test samples

A technology of drop weight tearing test and measurement method, which is applied in the direction of measuring device, mechanical measuring device, ruler for direct reading, etc., can solve the problems of inability to guarantee the quality of judgment, affect work efficiency, and high judgment cost, and achieve good utilization The effect of value, ease of operation, and low production costs

Inactive Publication Date: 2013-09-11
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This measurement method is very time-consuming and laborious, not only cannot guarantee the quality of judgment, but also seriously affects work efficiency
In addition, the determination of the fracture can also rely on complex camera systems and special software, but this method is very complicated to operate and the cost of determination is very high

Method used

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  • Measuring scale for drop weight tear tests and method for measuring fracture surfaces of drop weight tear test samples
  • Measuring scale for drop weight tear tests and method for measuring fracture surfaces of drop weight tear test samples
  • Measuring scale for drop weight tear tests and method for measuring fracture surfaces of drop weight tear test samples

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Embodiment 1

[0045] refer to Figure 1 to Figure 3 , The embodiment of the present invention provides a measuring ruler for a drop weight tear test, comprising a measuring ruler body 5, the measuring area of ​​the measuring ruler body 5 has a length of 76.2mm and a width of 40mm. The thickness of the measuring ruler body 5 is 1 mm, the material is a transparent material, and the size of the length 76.2 mm is exactly the same as the fracture length of the sample 7 . The upper part of the measuring ruler body 5 is marked with a horizontal scale line 6, the length of the horizontal scale line is 60mm, and the distance between the horizontal scale lines is 1mm, and the horizontal scale line 6 is used for measuring figure 1 Moderately ductile fracture zone 3 length B. Measuring scale body 5 middle part is drawn with vertical scale line 8, and horizontal scale line 6 is perpendicular to vertical scale line 8, and the length of vertical scale line 8 is 20mm, and the spacing between vertical scal...

Embodiment 2

[0049] refer to figure 1 , figure 2 with Figure 4 , In this embodiment, the sample 7 with a thickness of 16 mm is taken as an example, and its fracture type belongs to ductile fracture. The specific position of the line t can be determined as t16 firstly by using the grids 9 on the left and right sides, and then the length of the ductile fracture zone 3 can be measured by the horizontal scale 6 . Finally, use the vertical scale line 8 to measure the width of the ductile fracture zone 3 at the t-line 2 on the notch side, and then calculate the shear section ratio SA according to the corresponding formula.

[0050] The measuring ruler is reasonable in design, easy to operate and low in production cost. The t-line 1 on the hammer side and the t-line 2 on the notch side can be quickly positioned without drawing auxiliary lines. More importantly, the measuring ruler does not need other measuring tools, and the measuring ruler can directly measure various characteristic dimens...

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Abstract

The invention discloses a measuring scale for drop weight tear tests and a method for measuring fracture surfaces of drop weight tear test samples, and belongs to the technical field of tests for mechanical properties of metal materials. The measuring scale comprises a measuring scale body. Transverse scale marks are drawn on the upper portion of the measuring scale body, longitudinal scale marks are drawn in the middle of the measuring scale body and are perpendicular to the transverse scale marks, and grids are drawn on the lower portions of two sides of the transverse scale marks. The measuring scale and the method have the advantage that various feature sizes of the fracture surfaces of the drop weight tear test samples can be quickly, accurately and directly measured by the measuring scale.

Description

technical field [0001] The invention belongs to the technical field of mechanical property testing of metal materials, and in particular relates to a measuring ruler for a drop-weight tear test and a method for measuring the fracture of a drop-weight tear sample. Background technique [0002] In the early stage of oil and natural gas pipeline construction, many pipeline brittle fracture accidents occurred. In order to prevent the occurrence of brittle fracture accidents, people have done a lot of research work. Practice has proved that in order to ensure the safety and reliability of pipeline steel, it is necessary to consider preventing the pipeline from breaking during normal operation in the pipeline design stage; loss. Therefore, it is required that the material should have a sufficiently low ductile-brittle transition temperature. Both the Charpy pendulum impact test and the drop weight tear test (DWTT) are test items used to characterize the toughness of materials, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B3/02G01B5/02G01B5/20
Inventor 凃应宏李荣锋张彤邝兰翔刘冬余立余晴
Owner 武汉钢铁有限公司
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