Holographic nondestructive testing of pipes.
Huber, Paul Mikel
Fuhs, Allen E.
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Pipes with internal and external radial and axial flaws were tested using double-exposure interferometric holography. A hydrostatic pressure was applied internally between exposures to stress each specimen. Photographs of the resulting holograms are presented. Surface displacements were measured from the interference fringe patterns formed in the holograms. Finite element methods were used to compute expected displacements. The results of the two methods compared within 32%. Additional specimens with internal grooves, which simulate warheads, were tested to determine if fragmentation patterns could be predicted by nondestructive means using holographic techniques. The method of holographic interferometry shows great promise for immediate application for warhead development.
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