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Device for measuring crack length of fracture toughness specimen

A technology for crack length and fracture toughness, which is applied in the field of devices for fracture toughness sample fracture detection, can solve the problems of measurement error, high cost, and inability to guarantee the accuracy of crack length, etc., achieve high detection efficiency, strong applicability, and solve the problems of test The effect of sample movement dislocation

Pending Publication Date: 2018-06-29
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of special fixing fixtures, in the process of using vernier calipers or microscopes, improper placement of samples may introduce measurement errors, so that the accuracy of the crack length cannot be guaranteed
During the measurement process, the jaws of the vernier caliper are in direct contact with the fracture, which can easily damage the fracture morphology of the sample
The specimen fracture itself is not clearly marked at different thickness positions, and the vernier caliper or microscope cannot accurately locate when selecting different thickness positions for measurement, which is prone to measurement errors
Although the "Automatic Fracture Image Analyzer" disclosed in CN 101782527A can quickly and accurately complete the measurement of the fracture crack length, the analyzer is complex in operation and high in cost, which is not conducive to popularization and application in daily detection work

Method used

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  • Device for measuring crack length of fracture toughness specimen
  • Device for measuring crack length of fracture toughness specimen
  • Device for measuring crack length of fracture toughness specimen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A device for measuring the crack length of a fracture toughness sample, including a front cover body 010, a rear cover body 020, a sample clamping structure for fixing the sample from the side and a scale structure for measuring the crack length, the sample The clamping structure includes L-shaped clamping block 030, clamping block limit screw 040, clamping block limit nut 050 and clamping block compression screw 130, and the scale structure includes horizontal scale 070, horizontal positioning block 080, vertical scale 060 and vertical slider 090;

[0045] The front sleeve body and the rear sleeve body are connected by sleeve body connection screws 140 and sleeve body connection nuts 150;

[0046] The front cover body is in an inverted U shape, and the rear cover body is in a rectangular shape.

Embodiment 2

[0048] A device for measuring the crack length of a fracture toughness sample, including a front cover body 010, a rear cover body 020, a sample clamping structure for fixing the sample from the side and a scale structure for measuring the crack length, the sample The clamping structure includes L-shaped clamping block 030, clamping block limit screw 040, clamping block limit nut 050 and clamping block compression screw 130, and the scale structure includes horizontal scale 070, horizontal positioning block 080, vertical scale 060 and vertical slider 090;

[0049] The front cover body and the rear cover body are respectively provided with a front moving groove 011 and a rear moving groove 021, and the clip limit screw passes through the front moving groove, the through hole 031 of the L-shaped clip block, the rear moving groove and the clip block The limit nuts are connected and fixed, and the clamp block compression screw passes through the screw hole 014 on one side of the f...

Embodiment 3

[0053] A device for measuring the crack length of a fracture toughness sample, including a front cover body 010, a rear cover body 020, a sample clamping structure for fixing the sample from the side and a scale structure for measuring the crack length, the sample The clamping structure includes L-shaped clamping block 030, clamping block limit screw 040, clamping block limit nut 050 and clamping block compression screw 130, and the scale structure includes horizontal scale 070, horizontal positioning block 080, vertical scale 060 and vertical slider 090;

[0054] A horizontal scale is arranged on the upper end faces of the front cover body and the rear cover body, a horizontal positioning block that can slide along the horizontal scale is arranged on the horizontal scale, a vertical scale is arranged on both sides of the horizontal scale, and the two sides of the horizontal scale The ends are respectively connected with vertical sliders, and the vertical sliders are embedded ...

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Abstract

The invention discloses a device for measuring the crack length of a fracture toughness specimen. The device comprises a front sleeve body, a rear sleeve body, a specimen clamping structure which is used for fixing a specimen from a side surface, and a scale structure which is used for measuring the crack length. According to the device, fracture toughness specimens with different sizes are fixedin a plurality of dimensions through the front sleeve body, the rear sleeve body and an L-shaped clamping block; the problems of movement dislocation of the specimen in a detecting method, and measurement errors caused by improper placement and the like are solved; accurate measurement of the length of cracks at different positions in the thickness direction of the fracture toughness specimen is realized through a measurement ruler and a positioning scale; the device is high in applicability and high in detecting efficiency.

Description

technical field [0001] The invention belongs to a device for detecting the fracture of a fracture toughness sample, in particular to a device for measuring the crack length of a fracture toughness sample. Background technique [0002] The safety assessment of mechanical equipment depends on the development of fracture mechanics. It is of great significance to master the cracking and propagation conditions of structural material cracks for the reliability calculation of equipment. Accurate determination of fracture toughness of materials is a prerequisite for structural design and damage tolerance assessment of mechanical equipment. Although "GB / T 21143-2007 Unified Test Method for Quasi-Static Toughness of Metallic Materials" recommends two different types of fracture toughness specimens (compact tensile specimens and three-point bending specimens respectively), but in the corresponding In the KQ and JQ calculation formulas, the fracture crack length is an important parame...

Claims

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Application Information

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IPC IPC(8): G01N3/04G01N3/06
CPCG01N3/04G01N3/062G01N2203/04G01N2203/0062G01N2203/0605G01N2203/0682
Inventor 李昂赵凯张毅吴福高蔚郑晓静
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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