# US 11,906,473 B2 · Anti-buckling jig for fracture toughness test

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- Number: US 11,906,473 B2
- Document ID: US11906473B2
- Status: Granted
- Kind: B2
- Application number: 17/278,569
- Filed: 2019-09-10
- Published: 2021-11-11
- Granted: 2024-02-20
- Earliest claimed: 2018-09-27
- Assignees: Industry-Academic Cooperation Foundation Gyeongsang National University
- Applicants: Industry-Academic Cooperation Foundation Gyeongsang National University
- Inventors: Hyo Kyung Sung; Sang Sik Kim; Dae Ho Jung; Jun Hyuk Park; Kwan Ho Lee
- Web page: https://patentgrep.com/patent/US11906473B2

## CPC

- G01N 3/02: Details
- G01N 3/04: Chucks
- G01N 3/08: by applying steady tensile or compressive forces (G01N3/28 takes precedence)
- G01N 2203/0017: Tensile
- G01N 2203/0019: Compressive
- G01N 2203/0062: Crack or flaws
- G01N 2203/0064: Initiation of crack
- G01N 2203/0066: Propagation of crack
- G01N 2203/0067: Fracture or rupture
- G01N 2203/027: Specimens with holes or notches
- G01N 2203/0423: using screws
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

Disclosed is an anti-buckling jig of a fracture toughness test. The anti-buckling jig includes: a first jig unit provided in a form of surrounding one side surface of a specimen; a second jig unit provided in a form of surrounding the other side surface of the specimen; and a screw provided to allow the first jig unit and the second jig unit to be coupled to each other. During the fracture toughness test of the specimen, the first jig unit and the second jig unit simultaneously support both sides of the specimen, so that the specimen is cracked in a single direction.

## Claims

### Claim 1

An anti-buckling jig of a fracture toughness test comprising:
a first jig unit provided in a form of surrounding one side of a specimen;
a second jig unit provided in a form of surrounding the other side of the specimen; and
a screw provided to allow the first jig unit and the second jig unit to be coupled to each other,
wherein during the fracture toughness test of the specimen, the first jig unit and the second jig unit simultaneously support both sides of the specimen so that the specimen is cracked in a single direction, and
wherein the first jig unit and the second jig unit include observation grooves provided to visually observe the generation of the crack in the specimen during the fracture toughness test of the specimen.

### Claim 2 (depends on 1)

The anti-buckling jig of the fracture toughness test of claim 1, further comprising:
a friction reduction member provided between the first jig unit and the second jig unit to reduce a frictional force subjected to the specimen.

### Claim 3 (depends on 1)

The anti-buckling jig of the fracture toughness test of claim 1, wherein the first jig unit and the second jig unit include coupling grooves provided to couple the specimen and a testing device to each other during the fracture toughness test of the specimen.

### Claim 4

An anti-buckling jig of a fracture toughness test comprising:
a first jig unit provided in a form of surrounding one side of a specimen;
a second jig unit provided in a form of surrounding the other side of the specimen; and
a screw provided to allow the first jig unit and the second jig unit to be coupled to each other,
wherein during the fracture toughness test of the specimen, the first jig unit and the second jig unit simultaneously support both sides of the specimen so that the specimen is cracked in a single direction, and
wherein the first jig unit and the second jig unit include a plurality of screw grooves provided at corners of the first jig unit and the second jig unit to be coupled to each other through the screw with the specimen interposed therebetween.