Engineering topics

Wanagel, J.

Publications and source records attributed to Wanagel, J..

3 records

NASA NTRS1979

A split sphere 60,000 ton press

A split sphere press which can have a total force of 60,000 tons applied to its exterior by a 0.55 GPa hydrostatic pressure vessel is described. The inner anvils are made of tungsten carbide and show considerable plastic deformation under load. Much greater pressures, in the 100 GPa range, are possible if diamond tipped anvils are used. Because of the uniformly loaded multi-anvil arrangement, the diamond tips can be maintained under a high degree of compressive load and therefore prevent fracture which may occur in a conventional opposed anvil arrangement. Press operation on CdS, ZnSe, ZnS, GaP, and BP samples is described, and their resistance versus external pressure on the sphere are plotted.

Wanagel, J.↗

NASA NTRS1976

Pressure transition of AlP to a conductive phase

A direct simultaneous electric resistance method of comparison with ZnS and GaP is used to show that AlP becomes conductive at a pressure equal to or less than that of ZnS, which has been shown to transform at a pressure slightly less than that for ZnS and at a pressure considerably less than that for GaP. There are two possible explanations for this behavior: (1) the conductive phase of AlP observed is not the beta-tin phase, or (2) the theoretical predictions are in error.

Wanagel, J.↗

NASA NTRS1975

Yield stress of cemented tungsten carbide

Cemented tungsten carbide yields plastically at room temperature in the presence of a large hydrostatic pressure component. By approximate analysis of the state of stress in supported opposed anvils and by measurement of the pressure at which the anvil tips exhibit a permanent deviation from planarity, we have obtained the yield stress of such materials. Our value for the yield stress of a 3% cobalt cemented tungsten carbide is 86 kbar.

Ruoff, A. L.↗