Stress Field Variations during Dynamic Loading

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 s...

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Bibliographic Details
Main Author: DeGiorgi, Virginia G
Format: Report
Language:English
Subjects:
A517 STEEL
BRITTLENESS
CONTOURS
CRACKING(FRACTURING)
CRACKS
DYNAMIC LOADS
FINITE ELEMENT ANALYSIS
FRACTURE(MECHANICS)
IMPACT LOADING
INTERACTIONS
KINETIC ENERGY
Mechanics
Metallurgy and Metallography
PE61153N
REFLECTION
REFRACTION
STEEL
STRESS ANALYSIS
STRESS STRAIN RELATIONS
STRESS WAVES
STRESSES
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Summary: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.