Design of Dome Ends to Withstand Uniform External Pressure

1987 ◽  
Vol 31 (02) ◽  
pp. 139-143
Author(s):  
C. T. F. Ross
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
External Pressure ◽  
Efficient Design ◽  
The Finite Element Method ◽  
Qualitative Design ◽  
Uniform External Pressure ◽  
Element Method

A radical proposal is suggested for a more efficient design of dome ends to withstand uniform external pressure. A qualitative design of a cylinder/dome combination is considered, together with a stress investigation, using the finite-element method. These have shown that this design is feasible.

General Instability of Swedge-Stiffened Circular Cylinders Under Uniform External Pressure

1993 ◽  
Vol 37 (01) ◽  
pp. 77-85
Author(s):  
C. T. F. Ross ◽  
A. Palmer
Keyword(s):  
Finite Element Method ◽  
Experimental Investigation ◽  
Finite Element ◽  
Theoretical Analysis ◽  
External Pressure ◽  
Reduction Factor ◽  
Circular Cylinders ◽  
The Finite Element Method ◽  
Uniform External Pressure ◽  
Thinness Ratio

A theoretical and experimental investigation into the general instability of nine swedge-stiffened circularcylinders under uniform external pressure is described. The investigation found that most of the vesselssuffered plastic general instability, and that initial out-of-roundness played a significant role in the magnitude of the elastic knockdown. The theoretical analysis was based on the finite-element method, and a thinness ratio is proposed from which one can determine a plastic reduction factor when more experimental results are available.

scholarly journals Study on calculation method of stability for embedded penstocks with stiffener ring under external pressure

2021 ◽  
Vol 272 ◽  
pp. 02010
Author(s):  
Bifei Wang ◽  
Yuewei Li ◽  
Wenqiang Qi ◽  
Qihang Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
External Pressure ◽  
Reduction Factor ◽  
Surrounding Rock ◽  
The Finite Element Method ◽  
Initial Defect ◽  
Critical External Pressure ◽  
Element Method

A three-dimensional FEM(finite element model)is established, including penstocks with initial defect (ovality), backfill concrete, drainage cushion and surrounding rock. The nonlinear static calculation of the model is carried out. The stability of penstocks with backfill concrete, drainage cushion and surrounding rock under external pressure is studied. The sensibility of the embedded penstocks to initial defect, initial gap and elastic modulus of drainage cushion is analyzed. The results of finite element method, Jacobsen method and strength formula in SL281 are compared and analyzed. The results indicate that the FEM of penstocks, backfill concrete and surrounding rock with initial defects is easy to converge by nonlinear calculation; the ovality and gap have little influence on the critical external pressure of the embedded penstocks with stiffener ring, while the drainage cushion has a certain influence on the critical external pressure; the critical external pressure calculated by SL281 is low and safe; compared with Jacobsen method, the critical external pressure of the finite element method is increased by about 14%; for the embedded penstocks with drainage cushion, the finite element method can be used to calculate the influence of the drainage cushion on the critical external pressure, and the appropriate reduction factor can be obtained, and then the Jacobsen result can be modified by the reduction factor.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

Contact modelling by the finite element method : Application to the piezoelectric motor

1999 ◽  
Vol 09 (PR9) ◽  
pp. Pr9-217-Pr9-226
Author(s):  
H. Ouazzani Touhami ◽  
J. C. Debus ◽  
L. Buchaillot
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Piezoelectric Motor ◽  
The Finite Element Method ◽  
Contact Modelling ◽  
Element Method
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