Pressure Of Use Research Articles

STRUCTURAL PROBLEMS IN PENETRATED SPHERES UNDER PRESSURE

ABSTRACTThrough the use of three‐dimensional photoelasticity, studies have been conducted on the stresses in hatches, windows, and adjacent regions in penetrated spheres under external pressure for use in deep submergence structures.It was found, for tapered plug hatches and stiff “windows” with a low chamfer angle of 15° or less (measured from a local sphere radius at the penetration edge), that the stresses appear to be essentially the same as those in an un‐penetrated shell if the moduli of the shell and the closure are equal.For these low chamfer angles, the peak shell stress was increased when the window modulus was reduced below that of the shell. The highest shell stress was found around a conical frustum window with a large (40°) chamfer angle, which permitted the shell to deform almost freely.Results obtained from study of conical frustum windows having d/h (small face diameter/thickness) in the range of 0.5 to 2.5 indicated that a potentially dangerous stress concentration of a very high order exists on the conical surface near the small face. Small mismatches between window cone angle and seat cone angle appear to have relatively little effect on interior stress distributions, but can be important in reducing the stress concentrations. It was further observed that a window with a d/h < 1 behaves essentially as a conical sector of a hollow sphere, except in the immediate region of the flat small face.Finally, stress distributions from conical hatches and windows are compared with available results obtained from testing of models and prototype bathyspheres, and conclusions are developed relating to the strength and design of hatches and windows. Included are results just obtained from pressurizing small conical windows under constant long‐term loading, as a preliminary index of the tendency of plexiglas windows to creep in service.

The Free-Piston Engine Development—Present Status and Design Aspects

Abstract Three applications of free-piston engines are considered: (a) An internal-combustion engine air compressor combination where the useful output is compressed air for pneumatic purposes. (b) An air compressor combustion-chamber combination for the production of hot gases under pressure for use in a turbine to produce shaft work. (c) The compressor system as described in (a) together with a combustion chamber for internal-combustion heating of the compressed air and then a turbine to utilize the hot gases for the production of shaft work. Performance data for several existing free-piston systems are presented together with the results of cycle studies. The thermodynamic-dynamic design aspects are considered relative to the conventional crank-type reciprocating internal-combustion-engine system. The general conclusion reached is that the free-piston system has the prime advantages of excellent thermodynamic performance combined with mechanical simplicity. Consequently, a major development effort appears to be well warranted.

A simple quantitative measure of pressure for use in the projective techniques.

Journal of Clinical PsychologyVolume 8, Issue 2 p. 208-209 Article A simple quantitative measure of pressure for use in the projective techniques Claudine Gibson Wirths, Claudine Gibson Wirths University of North CarolinaSearch for more papers by this author Claudine Gibson Wirths, Claudine Gibson Wirths University of North CarolinaSearch for more papers by this author First published: April 1952 https://doi.org/10.1002/1097-4679(195204)8:2<208::AID-JCLP2270080226>3.0.CO;2-OCitations: 3AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume8, Issue2April 1952Pages 208-209 RelatedInformation