Mavor James W.

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Mavor
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James W.
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  • Working Paper
    Observation windows of the deep submersible, Alvin
    (Woods Hole Oceanographic Institution, 1965-12) Mavor, James W.
    The basis of the design of the ALVIN plexiglas windows is presented. The results of several tests of plexiglas windows are presented and discussed. it is concluded that the lapping of windows into their seats is unnecessary and that close fit is also not required. The ALVIN windows are conservative in design for an operating depth of 6000 feet. The use of a test window seat which does not simulate the hull strains is satisfactory for window test. It is recommended that the conical window seat be extended inward beyond the window to allow for normal elastic extrusion. Plexiglas windows are susceptible to collision damage due to brittleness and low strength of the material. An external rubber gasket was required to prevent low pressure leakage.
  • Working Paper
    Design and manufacture of new emergency hull release for Alvin
    (Woods Hole Oceanographic Institution, 1965-08) Mavor, James W. ; Sharp, Arnold G.
    The emergency hull release of ALVIN was redesigned in an effort to reduce shaft bending stress and to eliminate galling of contacting surfaces. new design features quarter-turn cam on unthreaded shaft instead of eight-turn threaded shaft of original device. major components are made of Monel K-500 and phosphor bronze inserts used at points of high contact stress.
  • Technical Report
    The mechanical and chemical properties of the HY 100 pressure hulls of the submarine, ALVIN
    (Woods Hole Oceanographic Institution, 1965-01) Mavor, James W.
    This report presents mechanical and chemical test data from the three pressure hulls fabricated for the Deep Research Submarine, ALVIN. The data is discussed briefly, the low Charpy V-Notch values after stress relief noted, and recommendations made for further testing required for design and evaluation. The three hulls are compared with reference to failure criteria.
  • Working Paper
    Weight, buoyancy and stabiltiy of the research submarine Alvin
    (Woods Hole Oceanographic Institution, 1965-06-28) Mavor, James W.
    During the period from October 1964 to May 1965, the ALVIN was located in a hanger at Otis AFB where a number of changes were made. These included: 1) Redesign of the electrical circuits to provide individual isolated circuits for the emergency systems. 2) Installation of leak detectors in the fixed buoyancy packages containing 7178-T6 Aluminum spheres. 3) Redesign of the hull release mechanism. 4) Installation of the pressure sensing mechanism (switch and valve) in the variable ballast system. 5) Replacement of the battery. 6) Addition of syntactic foam. 7) Addition of glass reinforced plastic reinforcement to the faired shell. 8) Addition of the second air bottle. 9) Removal of solenoids for manual operation of the conning tower flood valves. 10) Redesign of the interior sphere arrangement.
  • Technical Report
    Strength of the ALVIN hulls
    (Woods Hole Oceanographic Institution, 1966-04) Walsh, Joseph B. ; Mavor, James W.
    Results are presented of pressure tests, measurements and analyses of the strength of the three pressure hulls constructed for the deep submergence vehicle ALVIN. Comparison of stress distribution as measured in various tests and predicted theoretically is made. Failure of the hull can occur by buckling or by yielding over an appreciable fraction of shell thickness or by yielding at a stress concentration. A DTMB analysis predicts collapse of the three hulls No. 1, 2, and 3 at 7040, 7160, and 6720 psi respectively. No. 1 hull has been tested to 4400 psi. From strain measurements, isolated yielding at the inside surface of hull No. 2 (presently in ALVIN) will occur at a pressure of 5800 psi. However, yielding through the entire section would not occur until near the predicted collapse pressure. The maximum Mises equivalent stress at the test pressure of 3300 psi is 62,000 psi. The comparable material yield strength 125,000 psi is used with hull No. 2. the strength of the plexiglas viewing ports, the electrical lead-throughs and the hull release mechanism are referenced but not discussed.
  • Working Paper
    Summary report on fabrication, inspection and test of Alvin fixed and variable buoyancy spheres
    (Woods Hole Oceanographic Institution, 1965-01) Mavor, James W.
    Fifteen aluminum alloy spheres of approximately 2 ft. diameter are used in the research submarine ALVIN for fixed and variable buoyancy. Six of them (GM Dwg.542019) are made from 6061-T6 alloy and are known as the variable buoyancy spheres (V.B.). The material of the other nine is 7178-T6 alloy. These are known as the fixed buoyancy spheres (F.B) (GMI Dwg. 542019). This report describes the manufacture, inspection, test and predicted collapse pressure of these spheres. In addition, four additional spheres, two of each type were tested to failure. Results are reported.