The Response of Pipes and Supports to Internal Pressure Loads Generated by Gaseous Detonations

[+] Author and Article Information
G. O. Thomas

Centre for Explosion Studies, Department of Physics, University of Wales, Aberystwyth, UK SY23 3BZe-mail: got@aber.ac.uk

J. Pressure Vessel Technol 124(1), 66-73 (Aug 31, 2001) (8 pages) doi:10.1115/1.1427342 History: Received August 15, 2000; Revised August 31, 2001
Copyright © 2002 by ASME
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Schematic of straight pipe and gas re-circulating system
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Schematic of more complex pipe layout showing supports (S) and instrumentation positions: motion sensors (MS), strain gage pairs (SGP), and PCB pressure gages (P)
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Schematic of supports and mounting arrangement for the linear displacement transducers
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Comparison of typical measured detonation pressure with predicted analytically (smooth curve)
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Typical long duration strains for (a) gage parallel to axis of GRP tube, and (b) aligned along the circumference
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Higher time resolution strain histories recorded at three strain gage locations along the straight GRP pipe
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Distance time plot of detonation wave arrival times in driver tube (♦), first strain gage feature (•), and second strain gage feature (○)
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Strain gage outputs from two pairs of gages near the end cap of “T” piece. (a) and (b) axial; (c) and (d) transverse to tube main axis.
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Motion sensor outputs from gages located on (a) support S3 and (b) support S2 together with output from pressure gage P3. Test using the configuration shown in Fig. 2(c).
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Displacement sensor outputs showing coupling between orthogonal modes for a swept bends test using configuration shown in Fig. 2(a)
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(a) Pressures measured at and just after the first bend, and (b) hoop strain gage record obtained at the bend. Test using the configuration shown in Fig. 2(b).
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Pressure histories measured with GRP and PE pipes (a) at outside of first bend, and (b) outside of second bend. Both tests using the configuration shown in Fig. 2(b).
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Strain measurement obtained with the PE pipe—(a) ho op strain before the first bend, (b) axial strain before the first bend, and (c) hoop strain measured at the outside of the first bend
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Load–displacement histories of the coupled pipe and supports S1 and S2 shown in Fig. 2(c) when subject to (a) a quasi-static load, and (b) a reflected detonation. The pressure history shown is the side wall pressure history not the reflected end wall load.
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Experimental and predicted displacement based on a simple single degree of freedom model using the quasi-static stress strain relationship shown in Fig. 14(a)




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