The high stresses which normally occur in the vicinity of vessel closures are illustrated by the results of a number of experimental analyses. Experimental and theoretical work on simple plug closures is compared in an attempt to optimize thread parameters and so reduce peak stresses.
The fatigue life of vessels, operating beyond the yield point in local notched areas, has been considered and a method proposed for estimating life. The method has been checked in the range 103-105 cycles and is currently being used in the design of isostatic pressure vessels.
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References
1.
SouthwellR. V.Theory of elasticity1946, 416 and 417; 457 (Oxford University Press).
2.
SopwithD. G. ‘The distribution of load in screw threads’, Proc. Instn mech. Engrs1948159, 373–383 and 395–397.
3.
GoodierJ. N. ‘The distribution of load on the threads of screws’, J. Appl. Mech., Trans. Am. Soc. mech. Engrs194062, A10–A16.
4.
Von JaquetE. ‘Uber eine neuartige Schraubenverbindung’ (a novel screw connection), Ing.-Arch. 1931, 569–590.
5.
ManningW. R. D. ‘High pressure engineering’. Bulleid Memorial Lectures1963II, 20–21 and lect. 1, chap. 2 (University of Nottingham).
6.
TaylorC. E.SchweikerJ. W. ‘A three-dimensional photoelastic investigation of the stresses near a reinforced opening in a reactor pressure vessel’, Proc. Soc. expl Stress Anal.195717 (No. 1), 29 and 32.
7.
FesslerH.RoseR. T. ‘Photoelastic investigation of stresses in the heads of thick pressure vessels’, Proc. Instn mech. Engrs1957171 (No. 20), 633–643.
8.
MaclaughlinT. F. ‘Photoelastic analysis of thick-walled closed-end cylinders’, Proc. Soc. expl Stress Anal.196512 (No. 1), 129–134.
9.
TardyM. H. L. ‘Methode pratique d'examen et de mesure de la birefringence des verres d'optique’ (Practical methods of examination and measurement of optical glasses), Rev. d'optique19298, 59–69.
10.
HetenyiM.Handbook of experimental stress analysis1950, chap. 17, 889 (Chapman and Hall, London).
11.
HeywoodR. B. ‘Tensile fillet stresses in loaded projections’, Proc. Instn mech. Engrs1948159, 387, Fig. 30.
12.
MarinoR. L.RileyW. F. ‘Optimizing thread-root contours using photoelastic methods’, Experimental mechanics19644 (1), 10.
13.
PuzakP. P.BabeckiA. J.Pellini. ‘Correlation of brittle fracture service failures with laboratory notch ductility tests’, Weld. J. Res. Suppl. 1958 (Sept.), 391–407.
14.
TipperC. F.The brittle fracture story1962 (Cambridge University Press).
15.
‘Brittle fracture in steel’, Admiralty Advisory Committee on Structural Steel Report No. P31959 (Proc. Conf. Engng Dept. of University of Cambridge).
16.
BoxW. A. ‘The effect of plastic strains on stress concentration factor’, Proc. Soc. expl Stress Anal.8 (2), 99.
17.
GarrL.LeeE. H.WangA. J. ‘The pattern of plastic deformation in a deeply notched bar with semicircular roots’, J. appl. Mech., Trans. Am. Soc. mech. Engrs195678, 56–58.
18.
DixonJ. R. ‘Elastic-plastic strain distribution in flat bars containing holes or notches’, J. Mech. Phys. Solids196210, 253–263.
19.
EsinA.LambertT. H. ‘Analysis of elastic and elastoplastic strains in a notched plate’, J. Strain Anal.19661 (No. 4), 357–365.
20.
PetersonR. E. ‘Fatigue of metals in engineering and design’, Edgar Marburg Lecture1962 (Am. Soc. Test. Mater.).
21.
CoffinL. F.Tavernelli. ‘The cyclic straining and fatigue of metals’, Trans. Met. Soc. of A. I. M. E.1959215.
22.
CoffinL. F. ‘Low cycle fatigue’, Amer. Soc. Metal1963 (Nov.).
23.
LangerB. F. ‘Design of pressure vessels for low cycle fatigue’, J. Basic Engng, Trans. Am. Soc. mech. Engrs196284 (Series D), 389.
24.
LangerB. F.HardingW. F. ‘Material requirements for long-life pressure vessels’, J. Engng Pwr, Trans. Am. Soc. mech. Engrs196486 (Series A), 403.
25.
ForrestP. G.Fatigue of metals1962 (Pergamon Press, Oxford).
26.
PetersonR. E.Stress concentration design factors (John Wiley, New York).
27.
LiuH. W. ‘Fatigue crack propagation and the stresses and strains in the vicinity of a crack’, App. Mater. Res. 1964 (Oct.), 229–237.
28.
FrostN. E.HoldenJ.PhilipsC. E. ‘Experimental studies into the behaviour of fatigue cracks’, Proc. Crack Propagation Symp.19621, 166–187.
29.
PelliniW. S.GoodieR. J.PuzakP. P.LangeE. A.HuberR. W. ‘Review of concepts and status of procedures for fracture-safe design of complex welded structures involving metals of low to ultra high strength levels’, U. S. Nav. Res. Lab., Wash. Rep.6300, 1965.
