scholarly journals Hot slumped glass segments with reinforcing ribs technology for the manufacturing of the IXO telescope modules

2019 ◽  
Author(s):  
M. Civitani ◽  
S. Basso ◽  
A. Bianco ◽  
P. Conconi
Keyword(s):  
Reinforcing Ribs

scholarly journals Elastic Response of Acoustic Coating on Fluid-Loaded Rib-Stiffened Cylindrical Shells

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Christopher Gilles Doherty ◽  
Steve C. Southward ◽  
Andrew J. Hull
Keyword(s):  
Cylindrical Shell ◽  
Cylindrical Shells ◽  
Coupled System ◽  
Elastic Response ◽  
System Response ◽  
Elastic Cylindrical Shell ◽  
Fluid Environment ◽  
Reinforcing Ribs ◽  
Double Index ◽  
Stress Boundary Conditions

Reinforced cylindrical shells are used in numerous industries; common examples include undersea vehicles, aircraft, and industrial piping. Current models typically incorporate approximation theories to determine shell behavior, which are limited by both thickness and frequency. In addition, many applications feature coatings on the shell interior or exterior that normally have thicknesses which must also be considered. To increase the fidelity of such systems, this work develops an analytic model of an elastic cylindrical shell featuring periodically spaced ring stiffeners with a coating applied to the outer surface. There is an external fluid environment. Beginning with the equations of elasticity for a solid, spatial-domain displacement field solutions are developed incorporating unknown wave propagation coefficients. These fields are used to determine stresses at the boundaries of the shell and coating, which are then coupled with stresses from the stiffeners and fluid. The stress boundary conditions contain double-index infinite summations, which are decoupled, truncated, and recombined into a global matrix equation. The solution to this global equation results in the displacement responses of the system as well as the exterior scattered pressure field. An incident acoustic wave excitation is considered. Thin-shell reference models are used for validation, and the predicted system response to an example simulation is examined. It is shown that the reinforcing ribs and coating add significant complexity to the overall cylindrical shell model; however, the proposed approach enables the study of structural and acoustic responses of the coupled system.

Research on Performance of Coal Mine Refuge Chamber Reinforcing Ribs

2013 ◽  
Vol 631-632 ◽  
pp. 967-970
Author(s):  
Bing Xian Ou ◽  
Jun Xia Yan
Keyword(s):  
Coal Mine ◽  
Performance Optimization ◽  
Optimization Method ◽  
Element Analysis ◽  
Underground Coal Mine ◽  
Performance Requirements ◽  
Reinforcing Ribs ◽  
And Performance ◽  
Performance Research ◽  
Ansys Workbench

The coal mine refuge chamber is the necessary production of emergency system used in the underground coal mine. It can be installed conveniently and moved with the workplace. So it is more widely applied. The composition and basic performance requirements of coal mine refuge chamber were introduced in this paper. The performance of reinforcing ribs was done by finite element analysis software ANSYS Workbench and the performance optimization method of square tube reinforcing ribs thin plate was proposed. It can provide some reference for the design and performance research of refuge chamber bulkhead.

Stresses in Pressurized Circular Shells With Discontinuities, With or Without Stiffeners

1972 ◽  
Vol 16 (02) ◽  
pp. 140-147
Author(s):  
A. J. Durelli ◽  
V. J. Parks
Keyword(s):  
Experimental Determination ◽  
Mechanical Strain ◽  
Three Dimensional ◽  
Pressure Vessels ◽  
Circular Cylinders ◽  
Constant Thickness ◽  
Strain Gages ◽  
Circular Holes ◽  
Reinforcing Ribs

This paper is a summary of a series of five research programs dealing with the experimental determination of stresses, strains, and displacements in circular cylinders subjected to pressure. The vessels have either constant thickness or transverse reinforcing ribs. Circular holes, with either plain or reinforced edges, are located in different positions of the vessels. The methods used for the analysis are: brittle coatings, three-dimensional photoelasticity ("freezing" technique), and electrical and mechanical strain gages. The most important results are summarized in a table. These results will be of interest to designers of underwater ships and of pressure vessels in general.

STABILITY PERFORMANCE OF INFLATABLE TUBE IMITATING CLANIS BILINEATA LARVA UNDER AXIAL PRESSURE

2017 ◽  
Vol 17 (07) ◽  
pp. 1740028
Author(s):  
DONGHUI CHEN ◽  
JIANHUA LV ◽  
WEI LIU ◽  
ZHIYONG CHANG ◽  
XIAO YANG
Keyword(s):  
Body Wall ◽  
Ultimate Load ◽  
Limit Load ◽  
Strong Stability ◽  
The Body ◽  
Wall Structure ◽  
Axial Pressure ◽  
Stability Performance ◽  
Reinforcing Ribs ◽  
The Stability

The body wall structure of Clanis bilineata larva exhibits strong stability. This characteristic prompted the development of a new inflatable tube to improve the stability under axial pressure. The C. bilineata larva was chosen to observe the connection between its body wall and nearby muscle tissues, as well as the distribution of these tissues, by using the tissue section technique. Using this method, an inflatable tube with reinforcing ribs was designed. Simulation using the finite element method and experimentation were employed to compare and analyze the stability of the inflatable tube with and without reinforcing ribs under different axial pressure levels. Results indicate that the ultimate load of both inflatable tubes increases linearly with increasing pressure. The difference between the slopes of the two lines is small. Under different axial pressure levels, the ultimate load of the inflatable tube with reinforcing ribs is about 1.34[Formula: see text]N higher than that without reinforcing ribs; the ultimate compression power increased by 31% to 68% compared with that without ribs. The simulation results are slightly larger than the experimental results, but the ultimate load value in the simulation exhibits the same trend as that in the experiment. Finally, the limit load and ultimate compression power are used as evaluation criteria to quantitatively analyze the stability performance of an inflatable tube with reinforcing ribs under axial pressure.

scholarly journals The Role of Expanded Polystyrene and Geocell in Enhancing the Behavior of Buried HDPE Pipes under Trench Loading Using Numerical Analyses

Geosciences ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 251
Author(s):  
Omid Khalaj ◽  
Mehran Azizian ◽  
Naser Joz Darabi ◽  
Seyed Naser Moghaddas Tafreshi ◽  
Hana Jirková
Keyword(s):  
Expanded Polystyrene ◽  
Numerical Analyses ◽  
Fem Model ◽  
Buried Structures ◽  
Substantial Impact ◽  
Ground Pressure ◽  
Reinforcing Ribs ◽  
Maximum Surface Settlement ◽  
Light Material

In recent years, much research has focused on the use of various materials for relieving and strengthening soil, e.g., steel reinforcing ribs, geosynthetics, geocell, waste tires, and expanded polystyrene (EPS). EPS is being used increasingly in geo-infrastructure, being a super-light material, to replace part of the soil and decrease the ground pressure on buried structures. This paper presents experimental and numerical analyses of the effectiveness of expanded polystyrene and geocell reinforcement for ameliorating the behavior of unpressurized buried pipes exposed to surface loading. A 3-D finite element method (FEM) model of soil, geofoam, geocell, and piping was generated in ABAQUS, and the model was verified by experimental analyses conducted at a laboratory. The results show that reinforcing the soil cover with geocell and geofoam has a substantial impact, decreasing the maximum surface settlement by around 29% and maximum pipe crown displacement by up to 39.5%. In addition, the EPS block density can reduce the maximum pipe crown displacement substantially.

Optimization of a Reinforcing-Rib Design for ABS and High Glossy Surfaces of Plastic Parts

2013 ◽  
Vol 330 ◽  
pp. 724-729 ◽  
Author(s):  
Seong Won Jeong
Keyword(s):  
Influential Factor ◽  
Injection Mold ◽  
Section Thickness ◽  
Box Behnken Design ◽  
Design Variables ◽  
Draft Angle ◽  
Abs Resin ◽  
Reinforcing Ribs ◽  
Sink Marks ◽  
Plastic Parts

The goal of this study is to determine the optimum value of design variables in mixed conditions of the thickness, height and draft angle of reinforcing ribs within an objective limit in ABS resin and a high glossy surface. For this purpose, we investigated the actual depths of sink marks on the surface of the specimen that was manufactured with an injection mold specifically for this study. A response surface methodology with the Box-Behnken design was used to analyze the real depths with combinations of the thickness, height and draft angle of the ribs. The result shows that the most influential factor to increase the shrinkage is the thickness of ribs and that the optimum value of the rib thickness is a multiple of 0.31 of the section thickness. It was found that the rib height and rib draft angle are not factors that can change the sink amount.

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