Abstract
By repeatedly breaking and re-joining notched cylindrical specimens and measuring the true stresses involved, the effects on cohesion of temperature, environmental pressure, time apart and time in compression were evaluated. Compressive stresses were kept as high as possible without increasing specimen diameter excessively. Type 1018 Steel and OFHC Copper were studied in the 25 C to 500 C temperature range and in the 10−9 to 10−6 torr pressure range. Results are presented in the form of graphs relating per cent cohesion to the cumulative product of the time apart and the pressure while apart. The maximum cohesion obtained at room temperature was about 19% for the steel and about 12% for the copper. About 30% was obtained at 90 C on copper. Either exposure at low temperature to residual vacuum system gases reduces cohesion more than exposure at high temperature for both steel and copper or work hardening greatly reduces cohesion. The work reported herein was supported by the Office of Research Grants and C...
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