The nonisothermal oligomer hardening regime

We have established general quantitative relationships linking the magnitude of the induction period in isothermal and nonisothermal regimes of oligomer hardening for the case in which the nonisothermicity is determined by the kinetics of heat generation in the chemical reaction.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 56, No. 4, pp. 591–595, April, 1989.     

Effect of an asymmetrical loading cycle on the crack growth rate

PO Leningrad Metallurgical Plant. Translated from Problemy Prochnosti, No. 3, pp. 25–28, March, 1989.     

Influence of structural factors on the macro- and micromechanisms of fracture of austenitic dispersion-hardening alloys with an interrupted type of decomposition. Report 1

The commercial alloy 36NKhTYu in various structural conditions differing in the type of decomposition, grain size, and degree of dispersion of Y'- and -phase hardening particles was investigated by high-voltage electron microscopy and determination of the mechanical properties in tension in fatigue tests. It was established that in the alloy with the original coarse grain size regardless of the type of structure being formed and the form of loading, fracture is primarily ductile, occurring by a dislocation-shear mechanism. The comparison of structures of different type that was made showed that the structure with interrupted precipitation of -phase has the highest fracture energy requirement as the result of the presence of plastic interlamellar layers, providing effective dissipation of the energy supplied in loading. Deformation and fracture of the fragmented and ultradispersed structures is controlled by collective rotational processes.Translated from Problemy Prochnosti, No. 10, pp. 23–28, October, 1992.     

SBTV铁电材料的制备和微观组织结构

采用固相反应法合成了SrBi2Ta2O9(简称SBT)和V掺杂SrBi2Ta2O9(简称SBTV)陶瓷,通过TG-DTA、XRD、SEM、TEM等技术手段研究了材料的烧结工艺、相组成和微观组织结构.研究表明V2O5是一种很好的助烧剂,掺杂后材料的烧结温度可降低200℃烧结后纯SBT均为单一的钙钛矿相SBT;掺杂后2种成型工艺所制备的SBTV除了生成少量Bi4(V2O11)外,仍主要由钙钛矿相组成;同时所有的材料都发生了一定程度的择优取向.掺杂后材料的晶粒形态发生变化棒状转化为片状.同时V掺杂后引起了晶格畸变,产生应变,SBTV材料在透射中观察到具有α-边界特征的90°畴.     

IR Spectroscopic Study of the Organic Component of Ultrafine Diamond Produced by Detonation Synthesis

IR spectra of ultrafine diamonds produced by different teams of researchers are studied. The effects of heating and radiation on the properties of ultrafine diamonds are studied. Quantitative assumptions on the kinetics of formation of ultrafine diamonds are made from analysis of IR spectra.     

Channel-collapse effect examined with laboratory equipment and by two-dimensional calculation

Combustion, Explosion, and Shock Waves -