SEDL / STP / STP1074-EB / STP18992S

Dynamic Fracture Behavior of a Structural Steel

Cho, K
Research Associate, Undergraduate Research Assistant, and Professor of Engineering, Brown University, Providence, R.I.

Sklenak, JP
Research Associate, Undergraduate Research Assistant, and Professor of Engineering, Brown University, Providence, R.I.

Duffy, J
Research Associate, Undergraduate Research Assistant, and Professor of Engineering, Brown University, Providence, R.I.

Pages: 18    Published: Jan 1990

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Abstract

Fracture experiments are described in which stress wave loading is employed to attain a stress intensity rate of about 2 ∙ 10⁶ MPa √m/s. The specimens consisted of prefatigued notched round bars of a high strength, low alloy martensitic steel. The tests covered the temperature range -150°C to 200°C. Comparison is made with corresponding results of quasistatic tests on specimens of the same geometry as well as with results of other investigators who tested similar steels. The present steel contains manganese sulfide inclusions in the form of stringers and globules. Their role in the fracture process is examined by optical and scanning electron microscopy.