Fracture Toughness Testing Now Performed at Laboratory Testing Inc.

▤ Summary

Fracture toughness testing according to ASTM E399 applies a continuously increasing load to the specimen and determines KIC.ASTM E1820 uses a rising load with periodic partial unloading to measure the instantaneous crack length and provides both KIC and JIC.The Roman numeral subscript “I” indicates the test process in which a tensile load is applied normal to the direction of the crack plane.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.ASTM E1820 uses a rising load with periodic partial unloading to measure the instantaneous crack length and provides both KIC and JIC.

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