Abstract
This paper reports a preliminary study of a new laboratory test method designed to measure crack arrest toughness for tough, arrester grade steels. The design is basically focused on producing large enough driving force to produce fast fracture and arrest in a small test piece of a very tough, ductile material. Tests conducted on HY-80 steel and 7075 aluminum specimens are reported. The analysis of arrest measurements presented assumes that all the energy released is conserved or converted into fracture energy. A static, lower-bound arrest toughness is evaluated from compliance analysis using an elastic-static finite element simulation of the loading device. A photogrammetric aspect of the fracture surface is performed to quantify and relate the microstructural features with fracture toughness. The results are consistent with the view that arrest toughness value derived from the J-resistance curve is a valid measure of arrest capabilities of a tough material. It also indicates that rapid crack extension in a tough, ductile material can consume large amounts of kinetic energy released from the process of fracture.
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