Stress Field Variations during Dynamic Loading
NAVAL RESEARCH LAB WASHINGTON DC
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An understanding of and the ability to analytically predict the stress and strain field ahead of a crack tip is an essential portion of understanding the fracture process. In the case of dynamic loading induced fracture, fracture may be divided into three broad categories 1 fracture caused by a single stress wave or a small number of stress wave interactions, 2 stress wave dominated fractures caused by the complex combinations of initial, refractive and reflective stress waves and 3 fractures which occur after the kinetic energy associated with stress wave interactions is negligible. The current work examines the fracture of a three point bend specimen of A517 steel which fails by stress wave dominated brittle fracture. The Mode I stress contours during the dynamic loading transient are examined in detail. Five distinct Mode I stress contour patterns caused by the continual interactions of stress waves with increasing time are observed to occur prior to fracture.
- Metallurgy and Metallography