Effect of nonlinear creep on stress concentration around a reinforced opening in a spherical shell

1974 ◽  
Vol 6 (11) ◽  
pp. 1320-1323
Author(s):  
A. V. Burlakov ◽  
G. I. L'vov
Keyword(s):  
Stress Concentration ◽  
Spherical Shell ◽  
Nonlinear Creep

Stress Concentration in Nonlinear Creep of a Simple Shell

1966 ◽  
Vol 33 (2) ◽  
pp. 322-326 ◽  
Author(s):  
C. R. Calladine
Keyword(s):  
Cylindrical Shell ◽  
Stress Concentration ◽  
Strain Rate ◽  
Circular Cylindrical Shell ◽  
Bending Moment ◽  
Elastic Problem ◽  
Nonlinear Creep ◽  
Linear Elastic ◽  
Perfectly Plastic ◽  
Plastic Analysis

A long, thin circular cylindrical shell is loaded at one edge by symmetrical radial shear Qx and bending moment Mx. (No interior pressure.) The shell is made of material which under applied stress creeps with a strain rate which is proportional to the rth power of the stress. Previous results are used to derive, approximately, the greatest stress in the shell for any Qx, Mx, and r. It is shown that for any load the greatest stress decreases as r increases, and is approximately a linear function of 1/r. The case r = 1 is exactly analogous to a linear elastic problem, and the case r → = ∞ corresponds exactly to a perfectly plastic problem. Results for any exponent r may thus be found approximately by simple interpolation between results obtained in linearelastic analysis and perfectly plastic analysis.

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