scholarly journals K-joints of double-chord square hollow sections

1980 ◽  
Vol 7 (3) ◽  
pp. 523-539 ◽  
Author(s):  
Robert M. Korol ◽  
Magdi A. Chidiac
Keyword(s):  
Satisfactory Agreement ◽  
Experimental Results ◽  
Standard Type ◽  
Bolted Connection ◽  
Strength And Stiffness ◽  
Standard Channel ◽  
Channel Type

A new concept utilizing double-chord square hollow sections in welded K-joints of Warren trusses is described. The experimental results of 29 tests are reported, including four connection types: standard, channel, bolted, and back-to-back. The latter type comprised gapped, overlapped, and gapped with connecting stiffener plates.The results indicate that the standard type is an excellent joint in both strength and stiffness. The channel type is generally susceptible to twisting. It was found adequate only when a significant increase in chord thickness[Formula: see text] was employed. The bolted connection appears to hold promise when on-site assembly of large trusses is necessary. Its performance was further improved by connecting the chords with small tie bars. The back-to-back type needed to be reinforced or fully overlapped to develop full branch member strength. The double-chord system of connection reveals itself to be much superior in strength to an equivalent single-chord joint.The effects of eccentricity, branch member chord angle, and chord preloading were investigated. Interaction formulae are presented for the standard- and channel-type joints and their use is illustrated with examples. Satisfactory agreement between predicted and experimental ultimate strengths was obtained for joints that suffered from a chord failure at the connection.

Lower Body Orthotic Calipers With Composite Braces

2018 ◽  
pp. 133-151
Author(s):  
Nisha Kumari ◽  
Kaushik Kumar
Keyword(s):  
Mechanical Properties ◽  
Surface Finish ◽  
Volume Ratio ◽  
Solid Modeling ◽  
Experimental Results ◽  
Lower Body ◽  
Corrosion Resistant ◽  
Lower Weight ◽  
Modeling Software ◽  
Strength And Stiffness

Composite based materials are finding application in a large number of research and engineering spectrum due to its better mechanical properties (strength and stiffness), inherent surface finish, easiness in fabrication and installation and corrosion resistant. They are very strong and firm, yet very light in weight due to which lower weight-to-volume ratio can be achieved and stiffness to weight is 1.5 times greater than the non-ferrous materials like Aluminum. The work is undertaken in two parts. First and foremost being modeling and virtual estimation of mechanical properties using CREO and ANSYS for currently used aluminum based calipers and fabrication of the composites and testing of the same. A comparison is performed between the virtual and experimental results and also the effectiveness of composite based calipers over Aluminum ones is studied. Here two polymeric based composites are proposed for fabrication which are thermoplast and thermoset based composites respectively. The braces are modeled using a solid modeling Software, CREO and the same is tested using ANSYS.

Interpretation of the isotope shifts in the arc spectrum of xenon

1975 ◽  
Vol 343 (1635) ◽  
pp. 443-451 ◽  
Keyword(s):  
Ab Initio ◽  
Satisfactory Agreement ◽  
Parametric Study ◽  
Experimental Results ◽  
Isotope Shifts ◽  
Hartree Fock ◽  
Field Effects ◽  
Experimental Values

From the experimental results of Jackson & Coulombe (1974) and Vetter (1970) in the arc spectrum of xenon, the isotope shifts of 30 levels in the low configurations 5p56s, 5p56p, 5p55d and 5p57p are obtained, for the mass numbers 136, 134, 132, 130 and 128. A parametric study of these shifts for each isotope is made, with 3 parameters for the even levels and 6 for the odd levels. Following the conclusions of Jackson & Coulombe (1974), the respective contributions of mass- and field-effects to the shifts of the levels and to the parameters are evaluated from King diagrams. The ab initio values obtained for the parameters through the Hartree-Fock nonrelativistic and relativistic methods show a satisfactory agreement with the experimental values.

scholarly journals STUDIES ON THE PERMEABILITY OF MEMBRANES

1927 ◽  
Vol 10 (5) ◽  
pp. 685-701 ◽  
Author(s):  
L. Michaelis ◽  
A. A. Weech ◽  
A. Yamatori
Keyword(s):  
Satisfactory Agreement ◽  
Experimental Results ◽  
Transfer Number ◽  
Additional Argument ◽  
Anions And Cations ◽  
Transfer Numbers

The transfer numbers of the ions of electrolytes in the dried collodion membrane, as determined in a previous paper indirectly from the E.M.F. of concentration chains, can also be determined directly by electrical transfer experiments. It is shown that the difficulties involved in such experiments can be overcome. The transfer numbers obtained by the two methods are in satisfactory agreement. The experimental results obtained in the transfer experiments furnish an additional argument in favor of maintaining the theory that the electromotive effects observed in varying concentrations of different electrolytes with the dried collodion membrane may be referred to differences in the mobilities of the anions and cations within the membrane. As was shown by the method of the previous paper, the transfer number depends largely on concentration. There are some minor discrepancies between the values of the transfer numbers obtained by the two methods which, as yet, cannot be completely explained.

Boron and antimony codiffusion in silicon

1991 ◽  
Vol 6 (11) ◽  
pp. 2353-2361 ◽  
Author(s):  
B. Margesin ◽  
R. Canteri ◽  
S. Solmi ◽  
A. Armigliato ◽  
F. Baruffaldi
Keyword(s):  
Diffusion Model ◽  
Satisfactory Agreement ◽  
Solid Solubility ◽  
Experimental Results ◽  
Simulation Program ◽  
High Concentration ◽  
Donor Acceptor

The codiffusion of B and Sb implanted in Si with a dose of 2 × 1016 cm−2, corresponding to concentration far above the solid solubility, is investigated at 900 and 1000 °C on the basis of SIMS and carrier profile measurements and TEM observations. The comparison of the codiffusion data with the corresponding ones obtained by the diffusion of each element alone revealed several anomalous effects due to dopant interaction. In particular, our experimental results support the hypothesis of the formation of mobile donor-acceptor pairs and of the increase of the Sb solubility in the region where a high concentration of acceptors is present. On the basis of this feature, a diffusion model that takes pairing and precipitation into account is presented. A simulation program including this model allows us to foresee most of the anomalous phenomena occurring in the high concentration codiffusion experiments and shows in general a satisfactory agreement with experimental profiles.

scholarly journals Behavior of Hybrid CFRP Laminated Thin-Walled Beams: Experimental, Numerical, and Analytical Evaluations

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
A. M. Yosri ◽  
Gouda M. Ghanem ◽  
Mohamed A. E. Salama ◽  
Majed Alzara ◽  
Mohamed A. Farouk ◽  
...  
Keyword(s):  
Experimental Results ◽  
Fiber Reinforced Polymer ◽  
Core Material ◽  
Steel Beams ◽  
Specific Strength ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Hybrid Beams ◽  
Thin Walled ◽  
Strength And Stiffness

The aim of this paper is to assess the structural behavior of hybrid thin-walled beams which were fabricated using laminated carbon fiber reinforced polymer (CFRP). Seven hybrid (CFRP) I-beams were fabricated, instrumented, then have been tested under monotonic four-point loading in order to evaluate their behavior up to failure. In constructing the I-beam specimens which were evaluated in this study, plywood core was implemented on both the web and flanges. Several important parameters were conducted in this study considering changing both of the ply orientations and stacking sequences of laminated fibers, also changing the shear span-to-depth ratio (a/d) of the specimens. The experimental results showed that stacking sequence is the most significant parameter that influences both flexural strength and stiffness of the hybrid beams. Also, the experimental results promoted the effectiveness of the core material for enhancing the flexure (bending) stiffness of beams. Then, these results were compared with a previous simulated study which used the finite element modeling to model the beams. Also, in order to evaluate the efficiency of the CRFP beams, the results were compared to similar steel beams having the same dimensions of the CFRP beams. As compared to steel beams, the load carrying capacity of the laminated beams is being high compared with steel beams when taking into consideration their specific strength ratio.

The Ship Girder With Multiple Hatch Openings Under Torsion

1961 ◽  
Vol 5 (02) ◽  
pp. 9-12
Author(s):  
H. A. Schade
Keyword(s):  
Vertical Plane ◽  
Experimental Results ◽  
Unsymmetrical Loading ◽  
Strength And Stiffness ◽  
Shed Light ◽  
Experimental Effort

Recently there have been many proposals for unconventional arrangements of hatch openings in cargo vessel decks involving either hatches of unusual width or two or more lines of hatches. The problems concerned with bending in the vertical plane of such ship girders do not seem to offer special difficulty, but the effects of such unusual hatch configurations when the ship girder is twisted (as a ship may be by oblique seas or unsymmetrical loading) are not so well known. Tests reported by Bailey2 were an interesting experimental effort to shed light on these questions. The computation schemes described in this paper were used to predict the results on the six models used by Bailey2 independently by analysis alone. In general, the analytical predictions of both strength and stiffness agree well with the experimental results

Analytical Modeling of Chatter Stability in Turning and Boring Operations—Part II: Experimental Verification

2007 ◽  
Vol 129 (4) ◽  
pp. 733-739 ◽  
Author(s):  
Emre Ozlu ◽  
Erhan Budak
Keyword(s):  
Satisfactory Agreement ◽  
Experimental Verification ◽  
Analytical Modeling ◽  
Stability Limit ◽  
Experimental Results ◽  
Chatter Stability ◽  
Nose Radius ◽  
The Stability ◽  
Flexible Component ◽  
Cutting System

In this part of the paper series, chatter experiments are conducted in order to verify the proposed stability models presented in the first part (Ozlu, E., and Budak, E., 2007, ASME J. Manuf. Sci. Eng., 129(4), pp. 726–732). Turning and boring chatter experiments are conducted for the cases where the tool or the workpiece is the most flexible component of the cutting system. In addition, chatter experiments demonstrating the effect of the insert nose radius on the stability limit are presented. Satisfactory agreement is observed between the analytical predictions and the experimental results.

scholarly journals Removal of Cr(III) ions from salt solution by nanofiltration: experimental and modelling analysis

2016 ◽  
Vol 18 (3) ◽  
pp. 10-16 ◽  
Author(s):  
Anna Kowalik-Klimczak ◽  
Mariusz Zalewski ◽  
Paweł Gierycz
Keyword(s):  
Dielectric Constant ◽  
Satisfactory Agreement ◽  
Salt Solution ◽  
Planck Equation ◽  
Low Ph ◽  
Experimental Results ◽  
Tannery Wastewater ◽  
Modelling Analysis ◽  
Modelling Data ◽  
Dsp Model

Abstract The aim of this study was experimental and modelling analysis of the nanofiltration process used for the removal of chromium(III) ions from salt solution characterized by low pH. The experimental results were interpreted with Donnan and Steric Partitioning Pore (DSP) model based on the extended Nernst-Planck equation. In this model, one of the main parameters, describing retention of ions by the membrane, is pore dielectric constant. In this work, it was identified for various process pressures and feed compositions. The obtained results showed the satisfactory agreement between the experimental and modelling data. It means that the DSP model may be helpful for the monitoring of nanofiltration process applied for treatment of chromium tannery wastewater.

Pressure Drop and Apparent Solids Concentration inside a Novel Multi-Regime Riser

2013 ◽  
Vol 709 ◽  
pp. 309-312
Author(s):  
Xiao Lin Zhu ◽  
Guo Wei Wang ◽  
Qiang Geng ◽  
Chun Yi Li ◽  
Chao He Yang
Keyword(s):  
Pressure Drop ◽  
Satisfactory Agreement ◽  
Total Pressure ◽  
Operating Conditions ◽  
Experimental Results ◽  
Circulation Rate ◽  
Empirical Correlations ◽  
Solids Concentration ◽  
Solids Circulation Rate ◽  
Measured Pressure

In this study, pressure drop across a novel CFB riser integrated with an enlarged bottom section was investigated under various operating conditions. Experimental results indicated that total pressure drop was much higher across the riser with larger diameter-enlarged section dimensions, consequently, resulting in lower solids circulation rate realizable in the riser. Based on the measured pressure drop across this novel riser, apparent solids concentrations of the diameter-enlarged section and the conveying section were obtained. Furthermore, empirical correlations for estimating overall average solids concentration in these two sections were established, respectively. And a satisfactory agreement between predictions and experimental results was observed.

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