| Response of Polymers to Tensile Impact. 3. The Integral-Equation, Successive-Substitution Method Applied to Non-Linear Materials Having Time-Dependence (Creep, Relaxation). |
JAN 1976 |
68 pages |
| Authors:
Prescott D. Crout; Malcolm N. Pilsworth Jr.; Harold J. Hodge; ARMY NATICK RESEARCH AND DEVELOPMENT COMMAND MASS
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 | A better understanding is required of tensile-impact strains in military components such as body armor and parachute straps. A solution for the propagation of strain waves in elastic materials was extended to materials exhibiting creep and relaxation. The basic integral-equation, successive-substitution solution developed in two previous reports was extended using a model with two springs in series and a dashpot in parallel with one of them. With appropriate values, the ... |
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| Rapid Thawing and Heating of Foods. |
SEP 1974 |
36 pages |
| Authors:
Malcolm N. Pilsworth Jr.; Harold J. Hoge; ARMY NATICK LABS MASS
|
| An apparatus has been designed for the rapid thawing and heating of foods and has been tried out on scalloped potatoes, Creole squash, noodles and cheese, and Spanish rice. Joule heating is used, with the food itself serving as the resistance in which the heat is developed. Power is taken directly from the 60 Hz supply (208 V and up to 20 A) and is transformed as necessary. The foods ... |
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| Response of Polymers to Tensile Impact. 2. Extension of the Integral-Equation, Successive-Substitution Solution to Non-Linear, Time-Independent Materials. |
FEB 1974 |
87 pages |
| Authors:
Prescott D. Crout; Malcolm N. Pilsworth Jr.; Harold J. Hoge; ARMY NATICK LABS MASS
|
| An integral-equation, successive- substitution solution for the propagation of strain waves in a linear elastic material, developed in an earlier paper, is here extended to non-linear materials without creep (time-independent materials). A PREVIOUSLY-PUBLISHED PROBLEM, BASED ON EXPERIMENTAL DATA FOR NYLON STRING IS SOLVED BY THE SUCCESSIVE-SUBSTITUTION METHOD AND COMPARED WITH THE EARLIER SOLUTION OBTAINED BY THE METHOD OF CHARACTERISTICS. The agreement of the two solutions is at first good, but ... |
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| The Compression of Freeze-Dried Beef to Form Bars: Plasticizing with Water Transferred as a Vapor. |
JUN 1973 |
45 pages |
| Authors:
Malcolm N. Pilsworth Jr.; Harold J. Hoge; ARMY NATICK LABS MASS
|
| The plasticizing of freeze-dried beef by water addition and the compression of the beef to form rehydratable bars have been accomplished using two different sets of equipment. Water addition has been accomplished by transfer of water vapor to the meat in an evacuated system. The water added should be about 12% of the weight of the dry meat. It can be transferred in a period of 3 to 5 hours. ... |
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| An Experimental Study of the Freeze-Drying of Raw Beef. |
OCT 1972 |
31 pages |
| Authors:
Malcolm N. Pilsworth Jr.; Ronald A. Segars; Harold J. Hoge; ARMY NATICK LABS MASS
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| Freeze-drying curves for small sticks of beef are presented and it was found that in many cases the specimen weight was accurately represented by a quadratic function of the time. In many runs the drying was interrupted and the cross-section of the ice core was measured, after which the freeze-drying was completed. A graph showing ice-core diameter versus percent of water (including ice) remaining in the specimen is given, showing ... |
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| The Thermal Conductivity of Natural Rubber from 134 to 314 K. |
JAN 1971 |
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| Authors:
Malcolm N. Pilsworth Jr.; Harold J. Hoge; Henry E. Robinson; ARMY NATICK LABS MASS
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 | The thermal conductivity of soft natural rubber, compounded and vulcanized as specified in ASTM recipe 2A, has been measured over a range extending from well below the glass transition to above room temperature. The glass-transition temperature deduced from the thermal- conductivity measurements is 212 K (-78 F). Most of the measurements were made at the Natick Laboratories in a guarded-hot-plate apparatus, with silicone rubber pads on either side of the ... |
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