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Impact loads generated by tandem cavitation bubble on solid wall

Journal of Hydrodynamics 2022年第3期34卷 467-482页

作者： nyo me thet naing Jaehyun Park Seung-Ho Hyun Rho-Taek Jung School of Naval Architecture and Ocean Engineering University of UlsanUlsanKorea School of Electrical Engineering University of UlsanUlsanKorea Foundation for Industry Cooperation University of UlsanUlsanKorea

Experiments on two cavitation bubbles,which are generated at the same instant,with three different sizes near solid wall are conducted and their impulses on the boundary are registered by polyvinylidene fluoride(PVDF)*** to being near the boundary,bubble interactions and deformed features are in contrast with those in infinite fluid *** this paper,five morphologies of bubble deformation during growth and collapse phases are observed by high-speed *** profiles are strongly influenced by inter-bubble distance(η),stand-off distance from boundary(γ),and bubble size *** of photographs coupled with sensor measurements enabled qualitative investigation of two bubble interactions on the *** sensor data acquisition,it is confirmed that lower bigger bubble with upper smaller bubble configuration produces highest impulses on the boundary compared with other vertical arrangements of the tandem cavitation bubble employed in this study.

关键词： Two bubbles spark-generated bubble impulse polyvinylidene fluoride(PVDF)

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Effect of Conventional and Pulsed TIG Welding on Microstructural and mechanical Characteristics of AA 6082-T6 Repair Welds

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Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 865-876页

作者： naing thet Htet MUANGJUNBUREE Prapas Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla90110Thailand Center of Excellence in metal and Materials Engineering(CEMme) Prince of Songkla UniversityHat YaiSongkhla90110Thailand

Repair welding of AA 6082-T6 joints was carried out using ER 4043 filler through the TIG welding process with or without pulsed *** and mechanical characteristics of the joints before and after repairing were investigated by examining macrostructure,microstructure,and distributions of porosity in the weld metal(WM),and by hardness,tensile,and bending *** observed that the welding current,phase transformations in heat-affected zone(HAZ)and porosity introduced in the WM during welding influence on its mechanical properties in *** experimental results showed that the bead width and penetration as well as size of pores in the joints were mainly influenced by the welding *** sound joints were obtained at a welding current of 140 A with or without pulsed current when welding speed and gas flow rate were set at 20 cm·min-1 and 15 L·min-1,*** them,the decrease in mechanical properties of repair weld(RW)was directly related to the phase transformations in the over-ageing zone due to the double welding thermal cycles and elevated distribution of porosity in the *** addition,it was observed that the comparatively smaller grain size and lower porosity in WM of the RW produced by pulsed TIG welding gave a positive effect on its mechanical properties.

关键词： repair welds pulsed TIG welding aluminum alloy 6082-T6 ER 4043 filler

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Petrology and Geochemistry of Basalts from Tonnge Area, Tigyaing Township, Sagaing Region, Myanmar

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Open Journal of Geology 2019年第9期9卷 516-526页

作者： Myo Min Tun Myo Theingi San Yee Khaing thet naing Zar Oo Sann Aung Kyaw Thin Department of Geology Yadanabon University Mandalay Myanmar Department of Geology Loikaw University Loikaw Myanmar Department of Earth Resources Engineering Kyushu University Fukuoka Japan Department of Geology Pathein University Pathein Myanmar Department of Geology Defence Services Technological Academy Pyin Oo Lwin Myanmar Banmaw University Banmaw Myanmar

Tonnge basalt is a relatively small basaltic field situated in the Tigyaing Township, Sagaing Region, Myanmar. This basaltic field is considered as one of the occurrences of younger extrusive rocks along the major strike-slip fault of central Myanmar. The basaltic lava flows erupted and rested upon the Upper Miocene-Pliocene Irrawaddy Sandstone. Petrological and geochemical studies of the Tonnge basalts have not been carried out yet. This paper reports the results of petrological and geochemical investigation on the basalts from Tonnge area. These data have provided insight into the origin and petrogenetic processes during evolution. The petrographic characteristics of the basalts have been studied using polarizing microscope. The major- and trace-element compositions of basalt samples were analyzed using X-Ray Fluorescence. The Tonnge basalts are porphyritic, holocrystalline and consist of phenocrysts of olivine, plagioclase ± clinopyroxene which are set in the fine-grained intergranular groundmass of olivine, pyroxene, and opaque minerals. The basalts show typical characters of alkali olivine basalts. Trace element assemblage of the studied basalts plots on various discrimination diagrams as within-plate basalt erupted in the continental setting. A relatively small volume, monogenetic nature and unique geochemical characteristics of the basaltic lavas suggest that they are derived from a single, short-lived, discrete parental magma as a result of partial melting.

关键词： Tonnge Olivine Basalt Within-Plate Partial melting

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