Determination of the concentration limits of flame propagation at elevated temperatures

1972 ◽  
Vol 8 (1) ◽  
pp. 67-69 ◽  
Author(s):  
V. A. Bunev
Keyword(s):  
Flame Propagation ◽  
Elevated Temperatures ◽  
Concentration Limits

scholarly journals Chlorine-Functional Silsesquioxanes (POSS-Cl) as Effective Flame Retardants and Reinforcing Additives for Rigid Polyurethane Foams

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3979
Author(s):  
Anna Strąkowska ◽  
Sylwia Członka ◽  
Karolina Miedzińska ◽  
Krzysztof Strzelec
Keyword(s):  
Flame Retardants ◽  
Elevated Temperatures ◽  
Bending Strength ◽  
Reaction System ◽  
Fire Retardant ◽  
Polyurethane Foams ◽  
Polymerization Reaction ◽  
Three Point Bending ◽  
One Step

The subject of the research was the production of silsesquioxane modified rigid polyurethane (PUR) foams (POSS-Cl) with chlorine functional groups (chlorobenzyl, chloropropyl, chlorobenzylethyl) characterized by reduced flammability. The foams were prepared in a one-step additive polymerization reaction of isocyanates with polyols, and the POSS modifier was added to the reaction system in an amount of 2 wt.% polyol. The influence of POSS was analyzed by performing a series of tests, such as determination of the kinetics of foam growth, determination of apparent density, and structure analysis. Compressive strength, three-point bending strength, hardness, and shape stability at reduced and elevated temperatures were tested, and the hydrophobicity of the surface was determined. The most important measurement was the determination of the thermal stability (TGA) and the flammability of the modified systems using a cone calorimeter. The obtained results, after comparing with the results for unmodified foam, showed a large influence of POSS modifiers on the functional properties, especially thermal and fire-retardant, of the obtained PUR-POSS-Cl systems.

Calculating the concentration limits of flame propagation in vapor-air mixtures

2008 ◽  
Vol 51 (6) ◽  
pp. 228-229
Author(s):  
N. I. Akinin ◽  
I. V. Babaitsev ◽  
N. N. Bulkhov ◽  
N. A. Smirnova
Keyword(s):  
Flame Propagation ◽  
Concentration Limits

Determination of the Creep Deflection of a Rivet in Double Shear

1959 ◽  
Vol 26 (2) ◽  
pp. 285-290
Author(s):  
Joseph Marin
Keyword(s):  
Theoretical Prediction ◽  
Power Plants ◽  
Elevated Temperatures ◽  
Structural Components ◽  
Double Shear ◽  
Riveted Joints ◽  
Simple Tension ◽  
Riveted Joint ◽  
Jet Power

Abstract Structural components of modern aircraft are subjected to elevated temperatures by jet power plants and by skin friction resulting from supersonic speeds. Some of these high-temperature-aircraft structural components are riveted connections. Considerable experimental data are available on the creep of riveted connections used in aircraft [1]. However, a survey of the literature shows a lack of results on the theoretical prediction of creep in riveted connections from the usual creep and creep-rupture data for simple tension. The creep of a riveted joint is dependent on various factors including rivet diameter, rivet lengths, and plate thicknesses. This influence of size means that each particular riveted joint must be tested to obtain the necessary information. A basic approach to the problem is theoretically to predict the creep behavior of riveted joints from creep in simple tension. One of the important parts of the creep deformation of a riveted connection, Fig. 1(a), is the creep of the rivet. This paper deals with an approximate theoretical prediction of the creep deflection in a rivet based upon the creep constants of the material in simple tension.

Concentration Limits of Flame Propagation

2011 ◽  
pp. 73-93
Author(s):  
Boris E. Gelfand ◽  
Mikhail V. Silnikov ◽  
Sergey P. Medvedev ◽  
Sergey V. Khomik
Keyword(s):  
Flame Propagation ◽  
Concentration Limits
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