Stress and Strain State Analysis of Defective Pipeline Portion

The paper presents computer simulation results of the pipeline having defects in a welded joint. Autodesk Inventor software is used for simulation of the stress and strain state of the pipeline. Places of the possible failure and stress concentrators are predicted on the defective portion of the pipeline

Problemas regionales de desempleo en el contexto de la globalización

The paper provides the analysis of indicators, necessary for the evaluation of the security of the national labor market and its involvement in the processes of globalization. The research results are tested based on the Russian labor market analysis. The authors focused on the analysis of the dynamics of labor flows in the modern labor marketEl documento proporciona el análisis de indicadores, necesarios para la evaluación de la seguridad del mercado laboral nacional y su participación en los procesos de globalización. Los resultados de la investigación se prueban con base en el análisis del mercado laboral ruso. Los autores se centraron en el análisis de la dinámica de los flujos laborales en el mercado laboral moderno

Mechanical state assessment using lamb wave technique in static tensile tests

The paper deals with the investigation of Lamb wave ultrasonic technique for damage (or mechanical state) evaluation of AA7068T3 specimens in the course of tensile testing. Two piezoelectric transducers (PZT), one of which is used as an actuator and the other as sensor, were adhesively bonded on the specimen surface using epoxy. Two frequencies of testing signals (60 kHz and 350 kHz) were used. The set of static tensile tests were performed. The recorded signals were processed to calculate the informative parameters in order to evaluate the changes in stress-strain state of the specimens and their microstructure