Plastic Collapse of Stainless Steel Optical Tubes Used in Steel Armored Cables

[+] Author and Article Information
Oscar F. “Erik” Slotboom

University of Texas at Austin, 6000 Shepherd Mountain Cove, #2202, Austin, TX 78730erik.slotboom@bus.utexas.edu

J. Mech. Des 122(2), 219-227 (Mar 01, 1999) (9 pages) doi:10.1115/1.533563 History: Received March 01, 1999
Copyright © 2000 by ASME
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(a) Collapse of helical optical tube in laboratory testing, cable #3 of Table 3. (b) Actual field failure of helical optical tube, cable #8 of Table 3.
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(a) EOM cable cross section with central optical tube (cable #1 in Table 3) and (b) three helical optical tubes (cable #5 in Table 3)
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(a) Radially directed force on helical optical tube and (b) observed collapse pattern of tube
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EOM cable with concentric copper serve over central 1.32 mm optical tube (cable #2 of Table 3). This design concentrates pressure on the optical tube, since the copper serve does not carry tangential load but transmits the pressure it sustains directly to the central tube.
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Typical hard cable strain vs. tension response. This applies for all cables, regardless of size and armor steel cross section area. Response values are approximate and will vary from cable to cable. (a) Typical cable where collapse criterion is not achieved. (b) Cable with high tube pressure where the collapse criterion is achieved.
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Planes of maximum shear stress for (a) σzrt, the ordering which exists in the initial plastic zone, (b) σrzt, the ordering which exists when σz becomes negative, and (c) σztr
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Positive internal and external hydrostatic pressure on the thick-walled tube
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Idealized stress-strain diagrams: (a) perfectly plastic, (b) elastic-perfectly plastic, (c) elastic with linear work hardening
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Strain and core pressure for cable design #1
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Cable design #1 stress components for nonhardening and hardening cases with ν=0.5
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Stress distribution across cross section of tube in cable design #1 with cable tension of 44.5 kN. Radial stresses are nearly identical in the hardening and nonhardening cases and are depicted by a single line closest to the stress=0 axis. The legend of Fig. 10 applies.
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Stress calculation for cable #2 of Table 3. The black square represents the cable tension corresponding to the pressure computed by Eq. (30). The legend of Fig. 10 applies.




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