Engineering topics
Publications and source records attributed to Bernett, E. C..
Simple, inexpensive device can be attached to most metallographic sample polishing tables. It provides a suitable surface finish for microscopic examination or photography of surface details of the samples.
Decontamination, sterilization, and preconditioning effects on energy dissipating properties of balsa wood
Refractory materials in thermionic converters for spacecraft use, noting manufacturing problems and performance characteristiss
Static bearing capacity of simulated lunar surfaces in vacuum
Thermal properties of simulated lunar materials in air and in a vacuum
Thermal properties of simulated lunar material in air and in vacuum
This Report describes the test equipment that was developed and the procedures that were used to evaluate structural sheet-material compression properties at preselected constant strain rates and/or loads. Electrical self-resistance was used to achieve a rapid heating rate of 200 F/sec. Four materials were tested at maximum temperatures which ranged from 600 F for the aluminum alloy to 2000 F for the Ni-Cr-Co iron-base alloy. Tests at 0.1, 0.001, and 0.00001 in./in./sec showed that strain rate has a major effect on the measured strength, especially at the high temperatures. The tests, under conditions of constant temperature and constant compression stress, showed that creep deformation can be a critical factor even when the time involved is on the order of a few seconds or less. The theoretical and practical aspects of rapid-rate compression testing are presented, and suggestions are made regarding possible modifications of the equipment which would improve the over-all capabilities.