A Photoelastic Study of Stresses in Rotating Disks

1940 ◽  
Vol 7 (2) ◽  
pp. A57-A60
Author(s):  
R. E. Newton
Keyword(s):  
Stress Analysis ◽  
Fringe Pattern ◽  
Three Dimensional ◽  
New Technique ◽  
Uniform Thickness ◽  
Rotating Disks ◽  
Photoelastic Method ◽  
Freezing Method ◽  
Stress Freezing Method

Abstract The recent experiments of Hetényi and others in developing a technique for “freezing” stresses in bakelite and other photoelastic plastics have broadened tremendously the scope of the photoelastic method of stress analysis. In addition to making possible the solution of three-dimensional problems, the new technique offers itself as a powerful tool in solving problems in which it is inconvenient to study the fringe pattern while the model is actually under load. Problems of centrifugal stresses in constant-speed rotors fall in this class and are readily handled by the stress-freezing method. It is the purpose of this paper to discuss the application of the technique to the determination of the stresses in rotating disks of uniform thickness having symmetrically placed noncentral holes, as shown in Fig. 1 (1, 2).

FEM Stress Analysis of Tee Intersections With LTA

2008 ◽  
Author(s):  
T. Ahmad ◽  
M. Qadir ◽  
D. Redekop
Keyword(s):  
Stress Analysis ◽  
Three Dimensional ◽  
Local Area ◽  
Collapse Load ◽  
Wall Thinning ◽  
Dimensional Finite Element ◽  
Cyclical Loading ◽  
Different Depths ◽  
Three Dimensional Finite Element

In this work a three-dimensional finite element study is carried out of pressurized piping tee (tee) intersections, with local area wall thinning (LTA). Two types of stress analysis are carried out, dealing respectively with the determination of the stress concentration factor (SCF), and of the plastic collapse load. Stress values determined for vessels with uniform thickness are compared with previously published work. An evaluation is then made of the effect on the SCF values of varying the size and shape of the LTA around the intersection. This is followed by a parametric study in which the SCF and the collapse load are computed for intersections with different depths of wall thinning. Finally, comments are made on the fatigue of tees with LTA having cyclical loading superimposed on the constant pressure loading.

Stress Analysis of Shrink Fitted Joints of Solid Shafts and Three-Dimensional Photoelastic Experiment

1999 ◽  
Author(s):  
Fumito Nakagawa ◽  
Toshiyuki Sawa ◽  
Yuichi Nakano ◽  
Masahide Katsuo ◽  
Masahiro Yoneno
Keyword(s):  
Contact Stress ◽  
Three Dimensional ◽  
Partial Slip ◽  
Stress Distributions ◽  
Epoxide Resin ◽  
The Finite Element Method ◽  
Freezing Method ◽  
Photoelastic Experiment ◽  
Stress Freezing Method ◽  
Fringe Patterns

Abstract In this paper, shrink fitted joints of solid shaft and ring made of epoxide resin were assembled and photoelastic experiments were carried out. Isochromatic fringe patterns in the shrink fitted joint were measured using the three-dimensional stress freezing method. Then, the contact stress distributions in the shrink fitted joint of the ring and the solid shaft were analyzed using the finite element method. The three models, i.e., with slip, without slip and with partial slip at the interface were analyzed and the results were compared. The effects of chamfer at the edge of the interface and the material properties of the ring (hollow cylinder) on the contact stress distributions were examined.

Stress analysis in functionally graded rotating disks with non-uniform thickness and variable angular velocity

2016 ◽  
Vol 119 ◽  
pp. 283-293 ◽  
Author(s):  
Y. Zheng ◽  
H. Bahaloo ◽  
D. Mousanezhad ◽  
E. Mahdi ◽  
A. Vaziri ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Stress Analysis ◽  
Functionally Graded ◽  
Uniform Thickness ◽  
Rotating Disks
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