Stress-strain state of a thermosensitive bimetallic system

We study the influence of various conditions of heating of a thermosensitive bimetallic plate made of an ordinary structural material and alloy with shape-memory effect on stresses and displacements formed in the plate and establish the optimal ratio of the thicknesses of constituent materials which guarantces the maximum possible susceptibility of the system to displacements in the temperature range of the martensitic phase transformation. Pidstryhach Institute of Applied Problems in Mechanics and Mathematics, Ukrainian Academy of Sciences, L'viv. Franko Drohobych Pedagogical Institute, Drohobych. Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 32, No. 4, pp. 69–74, July–August, 1996.     

Influence of ethanol-gasoline blended fuel on emission characteristics from a four-stroke motorcycle engine

Emission characteristics from a four-stroke motorcycle engine using 10% (v/v) ethanol-gasoline blended fuel (E10) were investigated at different driving modes on the chassis dynamometers. The results indicate that CO and HC emissions in the engine exhaust are lower with the operation of E10 as compared to the use of unleaded gasoline, whereas the effect of ethanol on NO(X) emission is not significant. Furthermore, species of both unburned hydrocarbons and their ramifications were analyzed by the combination of gas chromatography/mass spectrometry (GC/MS) and gas chromatography/flame ionization detection (GC/FID). This analysis shows that aromatic compounds (benzene, toluene, xylene isomers (o-xylene, m-xylene and p-xylene), ethyltoluene isomers (o-ethyltoluene, m-ethyltoluene and p-ethyltoluene) and trimethylbenzene isomers (1,2,3-trimethylbenzene, 1,2,4-trimethylbenzene and 1,3,5-trimethylbenzene)) and fatty group ones (ethylene, methane, acetaldehyde, ethanol, butene, pentane and hexane) are major compounds in motorcycle engine exhaust. It is found that the E10-fueled motorcycle engine produces more ethylene, acetaldehyde and ethanol emissions than unleaded gasoline engine does. The no significant reduction of aromatics is observed in the case of ethanol-gasoline blended fuel. The ethanol-gasoline blended fuel can somewhat improve emissions of the rest species.     

Stress-strain state of a three-layer metal-containing polymeric rod

We consider a three-layer metal-containing polymeric rod subjected to thermal and mechanical loads taking into account the physical nonlinearity and rheonomic properties of the materials of the layers. For this rod, we obtain an exact solution of the problem of the theory of elasticity. For the solution of the problem of thermoviscoelastoplasticity, we apply the method of “elastic” solutions and present the results of its numerical realization. Belorussian State Transport University, Gomel, Belorussia. Translated from Problemy Prochnosti, No. 3, pp. 114–123, May–June, 1998.     

Stress-strain state of a gyroscope suspension under acoustic loading

The elastic interaction of the penetrating acoustic radiation of carrier rocket booster units with a suspension of a floated gyroscope is analyzed. The end plate of the float is considered to be the most dangerous from the standpoint of its low rigidity in the normal direction. Both qualitative and quantitative estimations of the strain state of the float are made. __________ Translated from Problemy Prochnosti, No. 1, pp. 39–54, January–February, 2007.     

Stress-strain state of a longitudinal-bending converter under resonant oscillations

Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Problemy Prochnosti, No. 6, pp. 81–84, June, 1989.     

Stress-strain state of solid railway wheels

A method for the design of railway wheels, which is based on use of the semianalytical finite-element method and which makes it possible to account for both the forces of contact interaction between the wheel and rail and negative production clearance during the press fitting of wheels, is developed.Translated from Problemy Prochnosti, No. 10, pp. 75–78, October, 1990.     

Stress-strain state of microinhomogeneous cracked plates

For the model of a microinhomogeneous body, we determine the distribution of efficient (averaged over microvolumes) components of the stress tensor and study the effects of the parameters of rigidity of the material in micro- and macrovolumes, the dimensions of the selected volume, and the angle of application of the external load on the value of critical (ultimate) stresses in the vicinity of the crack tip and the direction of crack propagation.Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv. Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 31, No. 2, pp. 50–56, March – April, 1995.