The effects of high-frequency mechanical impact (HFMI) treatment and preloading on the fatigue behaviour S355 steel transverse non-load-carrying attachments welded with technological defect ('lack fusion') in weld root are studied. joints were purposely incomplete penetration (a 3x3 mm formed over entire length). As established, this does not affect life since crack initiation propagation occur along toe. HFMI leads to a tenfold increase defects. Preloading as-welded at maximum alternating...

The combined effects of severe plastic deformation induced by high-frequency mechanical impact (HFMI) treatment and the electric discharge surface alloying (EDSA) with chromium on corrosion fatigue life low-carbon S355 steel transverse non-load-carrying specimens are studied in this paper. First, for various alternations HFMI + EDSA process, alloyed layer integrity depths were analyzed using scanning electron microscopy (SEM) accompanied energy dispersive spectroscopy (EDS) hardness...

A work is dedicated to experimental investigation of dependencies fatigue resistance sheet (δ = 2-3 mm) welded joints average and high strength aluminum alloys, which were produced using consumable-electrode pulsed-arc welding in inert gases (PMIG) as well determination efficiency rise their life through application high-frequency mechanical peening (HFMP) by set parameters strengthening.Efficient HFMP strengthening with the help portable manual equipment USP-300 determined based on...

We studied the effectiveness of application high-frequency mechanical peening to improve fatigue resistance characteristics tee welded joints in metal structures which are operated a sea climate.Corrosion damage characteristic for such after long-term service was produced by soaking KST-1 salt spray chamber 1200 h.Metallographic studies were conducted weld zone and HAZ initial (unstrengthened) state strengthening HFMP technology impact corrosive environment.It established that this does not...

To assimilate the thermohaline parameters' pseudo-measurements in model, applied is method of adaptive statistics, characteristic feature which consists adjusting three-dimensional errors' dispersions temperature and salinity forecast to water circulation basin.The fields are reconstructed 100-500 m layer based on altimetry data Argo buoys' limited measurements.The approved validated by comparing sea reanalysis for 2012 with measurements.It revealed that horizons 100, 113 125 m, differences...

Cyclic fatigue life of butt welded joints low-alloyed steel 09G2S, strengthened by the technology high-frequency mechanical peening (HFMP) at different stages fracture: in as-welded state, after accumulation 70 % damage, formation surface cracks, was studied.The objective these studies is establishing effectiveness application HFMP treatment long-term service alternating loading.It shown that strengthening right welding increases endurance limit (2 mln cycle base) 50 -from 180 up to 270 MPa,...

The investigation deals with the effectiveness of high frequency mechanical impact (HFMI) treatment technology to increase corrosion resistance a base metal and fatigue life as-welded T-shaped joints after their long-time exploitation in conditions modelling moderate climate. climate were simulated by exposing specimens moisture chamber G4 at temperature 40°C air humidity 98%. microstructure low alloy 15KhSND steel, weld zone heat affected (HAZ) before HFMI was investigated. tests carried...

We propose a procedure of reconstruction the continuous (in time) climatic annual behavior circulation in Black Sea based on successive assimilation distributions temperature and salinity complete nonlinear model. use monthly average arrays interpolated for each day year by expanding harmonic functions time. Various procedures aimed at data are studied taking into account variance measurement errors. Our main attention is given to analysis qualitative quantitative characteristics vertical...

We propose an algorithm of adaptive statistics prognostic errors aimed at the assimilation climatic temperature and salinity fields in a model dynamics sea. The is used for numerical solution proposed differential equations dispersions salinity. sources advective diffusion heat salt depend on four-dimensional one-dimensional (along vertical coordinate) measurement errors. are corrected times data. perform reconstruction analysis currents Black Sea. It shown that structure upper mixed layer...

Original technique of combined analysis temperature and salinity measurements altimetry observations in the Black Sea is proposed.The essence consists constructing (on chosen horizons) diagrams empirical relationships between integer sea level bins corresponding monthly average values taken from area bounded by 500 m isobath.Such a permits to mark out contribution adiabatic processes deformation profiles.At that profiles zero bin represent an unperturbed state.The constructed such way (at...