Fracture toughness is an important material property in design applications since flaws such as cracks, voids, inclusions, weld defects and discontinuities cannot be completely avoided. The fracture toughness test is also valuable in determining whether there is a danger of failure when a flaw is discovered in an existing structure.
The computerized fracture toughness test equipment at Laboratory Testing Inc. can generate 55,000 lbs. of tensile or compressive force. An environmental chamber controls the test temperature between -150° F and +350° F. LTI has fixturing to test various specimens in a range of sizes, including SE(B) (single edge bend) and C(T) (compact tension) specimens. The fracture toughness test requires a precisely machined specimen prepared to specification. The Machine Shop at LTI prepares all required specimens including those with an EDM notch.