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Zachowanie się glin lodowcowych z warszawskiego Ursynowa podczas obciążeń statycznych i dynamicznych

Kaczyński R., Bąkowska A., Kiełbasiński K.

Przegląd Geologiczny

2010

Vol. 58, nr 9/2

873-878

The stress-strain behaviour of tills under static and dynamic loadings were analyzed in the paper. Test results conducted on the tills from Ursynów area inWarsaw are presented. Extensive spectrum of advanced laboratory testing (including SEM, Row-Barden consolidometer, ring-shear apparatus, dynamic triaxial testing system) was used to determine physical, mechanical and microstructural properties of tills. Under static loadings studied tills have showed the behavior characteristic to overconsolidated soils. Parameters of residual shears strength are 40% lower comparing to maximum shear strength. Under cyclic loading of acceleration up to 1.5 m/s2 the failure did not appear. Cyclic loading causes a reduction in shear resistance, post-cyclic shear strength is equal to 18-76% of static (monotonic) shear strength of studied tills.

Estimation of the residual life of L17HMF cast steel elements after long-term service

Zieliński A., Dobrzański J., Golański G.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 34, nr 2

137-144

Purpose: of this paper is to present the changes of the mechanical properties and structure in material components of the power station boiler after long-term creep service made of G17CrMoV5-10 low-alloyed cast steel. Design/methodology/approach: The material of the research studies has been obtained from Polish power stations. Examined element has exceeded their assessed life of 105.000 hours. Mechanical properties and structure examinations were carried out on material after long-term service in creep conditions. The microstructure has been observed using a light and a scanning electron microscope. The investigation of the development of the precipitation processes was done by X-ray diffraction phase analysis. Findings: The microstructures and phase compositions of the residues, obtained from the elements, depend on life exhaustion extent. Practical implications: The presented method can be used for evaluation and qualification of structural changes in power station boiler and turbine components operating in creep conditions. Originality/value: The paper presents results of changes in the mechanical properties, structure and in the precipitation processes which are applied to evaluation for the condition of the elements in further industrial service.