Anti-buckling jig for fracture toughness test

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.