The stresses induced in reinforced plastic matrix pipes by saddle supports

1982 ◽  
Vol 17 (3) ◽  
pp. 147-155 ◽  
Author(s):  
C B Greatorex ◽  
A S Tooth
Keyword(s):  
Analytical Approach ◽  
Shell Theory ◽  
Experimental Results ◽  
Pipe Material ◽  
Design Features ◽  
Analytical Results ◽  
Reinforced Plastic ◽  
Pipe Radius ◽  
Series Of Experiments ◽  
Plastic Matrix

The results of a series of experiments conducted on reinforced plastic matrix pipes show how the peak stresses, occurring in the saddle support region, can be reduced in magnitude by certain design features. Two methods are found of value: (1) to use a flexible medium, such as PVC or rubber, between the saddle and pipe, and (2) to support the pipe on a saddle with a radius greater than the pipe radius. The experimental results are compared with an analytical approach using shell theory making the assumption that the pipe material is isotropic. The agreement between the experimental and analytical results is promising.

A Simple Analytical Approach for Creep Analysis of EB-FRP Systems

2018 ◽  
Vol 774 ◽  
pp. 42-47 ◽  
Author(s):  
Hugo Biscaia ◽  
Carlos Chastre
Keyword(s):  
Analytical Approach ◽  
Bond Stress ◽  
Experimental Results ◽  
Elastic Regime ◽  
Analytical Results ◽  
Creep Analysis ◽  
Proposed Model ◽  
Initial Load

Based on a few experimental results available in the literature, this work presents a simple analytical approach that allows the study of the long-term behaviour of CFRP-to-concrete interfaces under an initial sustaining load. Only the elastic regime is studied, which means that the interfacial maximum bond stress and maximum slip are never exceeded. Therefore, the maximum initial load to be sustained by the joints is limited by its corresponding elastic value. The analytical results provided by the proposed model are compared with some experimental results found in the literature. The results showed strain redistribution throughout the bonded length over the time.

scholarly journals Ochre-Based Pigments in the Tablinum of the House of the Bicentenary (Herculaneum, Italy) Between Decorative Technology and Natural Disasters

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 67
Author(s):  
Michele Secco ◽  
Leslie Rainer ◽  
Kiernan Graves ◽  
Arlen Heginbotham ◽  
Gilberto Artioli ◽  
...  
Keyword(s):  
Natural Disasters ◽  
Analytical Approach ◽  
Technological Development ◽  
Textural Properties ◽  
Thermal Alteration ◽  
Red Pigments ◽  
Non Invasive ◽  
Degradation Processes ◽  
Analytical Results ◽  
Color Scheme

Ochre-based pigments have been employed since the first artistic expressions of mankind, with widespread diffusion during the Roman civilization. Such prominent use influenced their technological development, focused on functional and aesthetic optimization through complex manufacturing procedures. Furthermore, their appearance is also influenced by degradation processes, sometimes driven by natural disasters such as the eruption of Mount Vesuvius in 79 AD, in which yellow ochres of Vesuvian sites were sometimes converted to red by thermal alteration. In this contribution, a multi-analytical approach was adopted based on preliminary non-invasive investigations complemented by laboratory analyses to characterize the painted surfaces of the tablinum of the House of the Bicentenary (Herculaneum) with a particular focus on the ochre-based monochrome backgrounds. The study was aimed at (a) reconstructing the original color scheme of the walls and (b) deciphering the complex decorative techniques adopted by Roman craftsmen. The analytical results allowed testing and defining analytical procedures for the discrimination between the original and converted red pigments. Furthermore, these studies indicated that specific decorative technologies were adopted according to aesthetic, functional, and economic purposes, including the utilization of various qualities of ochre with different compositional and textural properties, and the mixture of ochre pigments with other compounds.

scholarly journals An attempt to determine the adiabatic relations of ethyl oxide

1897 ◽  
Vol 60 (359-367) ◽  
pp. 336-337 ◽  
Keyword(s):  
Wave Length ◽  
Experimental Results ◽  
Mathematical Discussion ◽  
Series Of Experiments

The wave-length of sound in gaseous and in liquid ethyl oxide (sulphuric ether) has been determined by the two first-mentioned of the authors, by means of Kundt’s method, between limits of temperature ranging from 100° C. to 200° C., and of pressure ranging from 4000 mm. to 31,000 mm. of mercury, and of volume ranging from 2·6 c. c, per gram to 71 c. c. per gram. Making use of the same apparatus throughout, the results obtained are to be regarded as comparative, and, by careful determination of the pitch of the tone transmitted through the gas, it is probable they are approximately absolute. The sections of the complete memoir deal with (I) a description of the apparatus employed, (II) the method of ascertaining the weights of ether used in each series of experiments, (III) determinations of the frequency of the vibrating rod, (IV) the calculations of the adiabatic elasticity and tables of the experimental results, and (V) a mathematical discussion of the results. The last section is due to Mr. Rose-Innes.

An Analysis of Pipe Flange Connections Using Epoxy Adhesives/Anaerobic Sealant Instead of Gaskets

1995 ◽  
Vol 117 (4) ◽  
pp. 298-304 ◽  
Author(s):  
T. Sawa ◽  
R. Sasaki ◽  
M. Yoneno
Keyword(s):  
Stress Distribution ◽  
Internal Pressure ◽  
Theory Of Elasticity ◽  
Experimental Results ◽  
Clamping Force ◽  
Bonding Force ◽  
Epoxy Adhesives ◽  
Analytical Results ◽  
Sealing Performance ◽  
Circle Diameter

This paper deals with the strength and the sealing performance of pipe flange connections combining the bonding force of adhesives with the clamping force of bolts. The epoxy adhesives or anaerobic sealants are bonded at the interface partially instead of gaskets in pipe flange connections. The stress distribution in the epoxy adhesives (anaerobic sealant), which governs the sealing performance, and the variations in axial bolt force are analyzed, using an axisymmetrical theory of elasticity, when an internal pressure is applied to a connection in which two pipe flanges are clamped together by bolts and nuts with an initial clamping force after being joined by epoxy adhesives or anaerobic sealant. In addition, a method for estimating the strength of the combination connection is demonstrated. Experiments are performed and the analytical results are consistent with the experimental results concerning the variation in axial bolt force and the strength of combination connections. It can be seen that the strength of connections increases with a decrease in the bolt pitch circle diameter. Furthermore, it is seen that the sealing performance of such combination connections in which the interface is bonded partially is improved over that of pipe flange connections with metallic gaskets.

scholarly journals Modeling of microwave applicators with an excitation through the wave guide using TLM method

2005 ◽  
Vol 2 (2) ◽  
pp. 137-146
Author(s):  
Tijana Randjelovic ◽  
Jugoslav Jokovic ◽  
Bratislav Milovanovic
Keyword(s):  
Experimental Results ◽  
Wave Guide ◽  
Analytical Results ◽  
Resonant Modes ◽  
Impulse Excitation ◽  
Wave Guides ◽  
Tlm Method ◽  
Microwave Applicator ◽  
Good Agreement ◽  
Microwave Applicators

In this paper, a real microwave applicator with a wave guide used to launch the energy from the source into the cavity is analyzed using 3D TLM method. In order to investigate the influence of the positions and number of feed wave guides to the number of the resonant modes inside the cavity, obtained results are compared with analytical results and results obtained by using TLM software with an impulse excitation as well. TLM method is applied to the both empty and loaded rectangular metallic cavity, and a very good agreement between simulated and experimental results is achieved.

THE STUDY ON LUBRICITY PROPERTIES OF ARTERIAL VENOUS FISTULA NEEDLES

2002 ◽  
Vol 14 (03) ◽  
pp. 127-130 ◽  
Author(s):  
MING-CHUNG LEE ◽  
CHING-LUNG LIN ◽  
CHIU-LIN HUANG
Keyword(s):  
Medical Device ◽  
Weight Ratio ◽  
Experimental Results ◽  
Friction Reduction ◽  
Coating Solution ◽  
Silicone Fluid ◽  
Series Of Experiments ◽  
Venous Fistula

Silicone fluid is applied to reduce the friction of medical device in this study. Several factors, which might affect the friction of Arterial-Venous Fistula (A. V.F.) Needles, were investigated by a series of experiments. The experimental results showed that a better condition for the coating is using 10/90-weight ratio of MDX4/n-hexane silicone solution and dipping for 1.5 seconds. Two-step coating with an interval of 20 minutes also was examined to give an improvement in the lubricity of needles. It was observed that increased DC 360 concentration in coating solution displays more excellent friction reduction properties. Experimental consequences also showed that the lubricity of needles coated with DC 360 (350cst) is superior to that of coated with DC 360 (12,500cst).

An Approximate Model for an Elastic-Plastic Pipe Element Under Combined Loading

1975 ◽  
Vol 97 (1) ◽  
pp. 22-28 ◽  
Author(s):  
L. D. Larson ◽  
W. F. Stokey ◽  
W. E. Franzen
Keyword(s):  
Strain Hardening ◽  
Axial Load ◽  
Analytical Approach ◽  
Limit Load ◽  
Approximate Model ◽  
Experimental Results ◽  
Combined Loading ◽  
Elastic Plastic ◽  
Plastic Pipe ◽  
Plastic Analysis

An approximate model for the elastic-plastic analysis of a pipe element under combined loading is developed. The model is obtained by generalizing a limit load solution for combined pressure, bending, torsion and axial load to include strain hardening. For various combinations of loading of tubes, curvatures and twist angles are predicted and compared with experimental results and those predicted by a more rigorous analytical approach. The comparison shows that good results are obtained from the approximate model.

scholarly journals A Method for Constructing Supervised Topic Model Based on Term Frequency-Inverse Topic Frequency

Symmetry ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1486
Author(s):  
Zhinan Gou ◽  
Zheng Huo ◽  
Yuanzhen Liu ◽  
Yi Yang
Keyword(s):  
Topic Modeling ◽  
Topic Model ◽  
State Of The Art ◽  
Topic Models ◽  
Document Classification ◽  
Experimental Results ◽  
Tag Recommendation ◽  
Term Frequency ◽  
Series Of Experiments ◽  
Dirichlet Prior

Supervised topic modeling has been successfully applied in the fields of document classification and tag recommendation in recent years. However, most existing models neglect the fact that topic terms have the ability to distinguish topics. In this paper, we propose a term frequency-inverse topic frequency (TF-ITF) method for constructing a supervised topic model, in which the weight of each topic term indicates the ability to distinguish topics. We conduct a series of experiments with not only the symmetric Dirichlet prior parameters but also the asymmetric Dirichlet prior parameters. Experimental results demonstrate that the result of introducing TF-ITF into a supervised topic model outperforms several state-of-the-art supervised topic models.

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