Determination of the stress concentration zones during rupture of a filler layer in a composite material

Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Prikladnaya Mekhanika Vol. 25, No. 2, pp. 56–59, February, 1989.     

Calculations of Radiation-Induced Defect Profiles in CdHgTe Crystals Exposed to Ion Pulses

The formation and evolution of the radiation-defect profiles in CdHgTe crystals exposed to high-power ion pulses is examined. A mathematical model for radiation-defect formation allowing for the effects of an inhomogeneous nonstationary temperature field and mechanical quasi-static and dynamic stress fields is discussed. Examples of calculations are given, and the calculated and experimental data are compared.     

An Analysis of the Decay of Saint-Venant End Effects in a Transversely Isotropic Matrix with an Isotropic Covering

A calculation model is proposed for a numerical analysis of the decay of Saint-Venant end effects in a laminate material of irregular structure to which corresponds a transversely isotropic matrix with an isotropic covering. The elastic properties of the matrix correspond to those of a unidirectional glass-fiber-reinforced plastic. The problem is investigated within the framework of the concept of a representative element of the material. The decay of the end effect in the direction perpendicular to the isotropy plane of a transversely isotropic matrix for the case of symmetric deformation of the material is considered. The source of the end effect is simulated by a piecewise-constant periodic surface load. This load is local for the calculated region and changes within a part of the boundary comparable with the typical size of the structural heterogeneity of the material. The equations of the linear elasticity theory of orthotropic bodies, a model of piecewise-homogeneous media, and quantitative criteria of decay of the end effect are used. Starting from the base system of equations, a discrete problem is constructed and solved. The results of a computing experiment for the choice of a representative element and the results of determining the maximum extent of the end-effect zone for this element are presented.     

Acoustic Emission in Martensitic Transformations in Alloys under Mechanical Loading

In the alloys undergoing thermoelastic martensitic transformations under mechanical loading, accumulation and recovery of deformation is observed. The acoustic emission accompanying the martensitic transformations is a reflection of peculiar features of deformation-induced behavior of an alloy in the course of its transformation. The anomalous acoustic effect is correlated with the buildup of reversible deformation but is not so with that of the irreversible deformation.     

Numerical study of edge effects in laminated cylinders

S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 31, No. 6, pp. 28–33, June, 1995.