44 research outputs found
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Ultrasonic examination of thin iridium hemispheres for the multihundred watt heat source
An ultrasonic method was developed for nondestructive inspection of the structural integrity of the 20-mil (0.0508-cm) thick iridium hemispheres that are used in the fabrication of Multihundred Watt (MHW) radioisotopic heat sources. A hemisphere was considered unacceptable if a back-surface ultrasonic response change was equivalent to that obtained from a 0.010-in. (0.0254-cm) diameter flat-bottomed hole in the standard. Flaws were detected in hemispheres made by the initial fabrication process. Typical flaws found ultrasonically in these units and revealed by metallography are shown. Hemispheres formed after a change to a different fabrication process were free of flaws. (auth
Composição bromatológica, energia metabolizável e equações de predição da energia do grão e de subprodutos do trigo para pintos de corte
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Nondestructive testing of materials involved in the B-77 roll control program: June 1, 1976--December 15, 1976
This report covers all nondestructive development effort on the Roll Control Program for the period June 1, 1976 through December 15, 1976. Information previously reported will be re-presented here and appropriately updated. The samples consist of solid propellant and composites of propellant and inhibitor that are currently being examined in the accelerated aging and shelf life prediction studies of materials involved in the B-77 Roll Control Program
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