A new method of experimental buckling of circular cylindrical roof shell models with free edges subjected to external pressure

1971 ◽  
Vol 6 (5) ◽  
pp. 633-648
Author(s):  
Yoshitsura Yokoo ◽  
Tsuneyoshi Nakamura ◽  
Jun Miyazaki
Keyword(s):  
External Pressure ◽  
New Method ◽  
Shell Models ◽  
Free Edges

On the Plastic Buckling Paradox for Cylindrical Shells

1996 ◽  
Vol 210 (5) ◽  
pp. 477-488 ◽  
Author(s):  
J Blachut ◽  
G D Galletly ◽  
S James
Keyword(s):  
Biaxial Loading ◽  
Flow Theory ◽  
External Pressure ◽  
Test Results ◽  
Plastic Buckling ◽  
Shell Buckling ◽  
Axial Tension ◽  
Plate And Shell ◽  
Shell Models ◽  
Flow Theories

Previous investigations have raised some doubts about the accuracy of flow theory predictions for a few plate and shell plastic buckling problems. The present series of buckling experiments on machined, mild steel, cylindrical shell models under non-proportional biaxial loading (axial tension plus external pressure) was designed to provide additional data for the evaluation of the J2 plasticity theories. Numerical calculations were carried out with the BOSOR 5 shell buckling program, using the J2 deformation and flow theories, and these were compared with the test results. Neither theory can be said to predict plastic buckling accurately. However, deformation theory predicted the bifurcation buckling loads reasonably well, whereas flow theory was often incorrect.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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