Showing papers by "Vadim V. Silberschmidt published in 2005"
TL;DR: In this paper, the authors further developed the finite element (FE) model of ultrasonically assisted turning discussed in Mitrofanov et al. This model is used to study the effect of cutting parameters (such as the cutting speed, depth of cut and feed rate) and influence of lubrication on various features of two turning techniques, including cutting forces and chip shapes.
82 citations
TL;DR: In this article, a two-dimensional thermomechanically coupled finite element (FE) model of both UAT and conventional turning was proposed and compared with conventional turning using both computational results and infrared thermography experiments.
73 citations
TL;DR: In this article, the effect of randomness in distribution of matrix cracks in [0m/90n/0m] carbon fiber-epoxy laminates is studied.
Abstract: This paper presents a study of the effect of randomness in distribution of matrix cracks in [0m/90n/0m] carbon fibre–epoxy laminates. In contrast to standard approaches based on the unit cell (representative volume element), various crack distributions are introduced directly into finite element models. Magnitudes of crack spacings in 90° layers are taken from tensile fatigue experiments on T300/914C composites. The purpose of numerical simulations is to estimate the effect of the transverse crack arrangements on the character of the stress distributions in both the stiff 0° layers and the less stiff 90° layers. The influence of the crack spacing arrangement on the effective properties of laminates is discussed.
44 citations
TL;DR: In this article, an efficient procedure to analyze damage evolution in brittle coatings under influence of thermal loads is suggested, which is based on a general computational scheme to determine damage evolution parameters, which incorporates an analytical solution of the appropriate interim boundary-value thermoelasticity problem.
10 citations
TL;DR: In this article, the effect of microstructure on damage and fracture evolution due to elastic anisotropy in alumina coatings and a mismatch in thermal expansion of the coating and substrate is examined by means of numerical simulations.
5 citations
01 Jan 2005
TL;DR: In this article, it was found that matrix cracking in cross-ply laminates is not the immediate cause of the global failure of a laminate, but it affects the longitudinal stiffness of composites, to a greater extent.
Abstract: Publisher Summary Cross-ply laminates demonstrate a broad variety of failure mechanisms at different scales. Several of these mechanisms are not linked to an instantaneous fracture event of the entire component/structure but result in deterioration of the load-bearing capacity of composite materials. Application of tensile fatigue to cross-ply composites results in matrix-crack initiation at very early stages of their service and, in many cases, at stress levels below the one necessary for the first-crack formation under static loading conditions. With an increase in the number of cycles, the density of matrix cracks grows up to a certain saturation level, known as the characteristic damage state. Matrix cracking in cross-ply laminates under fatigue conditions was extensively studied experimentally using mainly the edge replication technique, X-ray radiography or direct observations of cracking in transparent glass-epoxy laminates. It was found that matrix cracking in cross-ply laminates is not the immediate cause of the global failure of a laminate. It affects the longitudinal stiffness of composites, to a greater extent—glass/epoxy laminates as compared to carbon/epoxy ones; which has been explained by the higher transverse ply stiffness of the former group.
2 citations