Stress Indices for Non-Radial Branch Connections for Piping

Sajish, S.D.; Sati, Bhuwan Chandra; Jalaldeen, S.; Selvaraj, P.; Chellapandi, P.

doi:10.1016/j.proeng.2013.03.266

Cited by 2 publications

(1 citation statement)

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“…Xue et al [8] proposed theoretical stress analysis models for connection subjected to external loads transmitted through branch pipes. Stresses indices in branch connections with different angles between header pipe and branch pipe were analyzed by Mkrtchyan et al [7] and Sajish et al [9]. However, authors used only numerical solutions and appropriate design codes but no experimental verification were present.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Steel Branch Connections during Fatigue Loading

Sládek

Patek²,

Mičian

2017

Archives of Metallurgy and Materials

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Fatigue behavior of the branch connection made of low-alloyed steel with yield stress of 355 MPa during low-cycle bending test is investigated in the article. Numerical prediction of the stress and strain distribution are described and experimentally verified by fatigue test of the branch connection sample. Experimental verification is based on low-cycle bending testing of the steel pipes welded by manual metal arc process and loaded by external force in the appropriate distance. Stresses and displacement of the samples induced by bending moment were measured by unidirectional strain gauges and displacement transducers. Samples were loaded in different testing levels according to required stress for 2.10 6 cycles. Increase of the stress value was applied until the crack formation and growth was observed. Results showed a high agreement of numerical and experimental results of stress and displacement.

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Section: Introductionmentioning

confidence: 99%

Behavior of Steel Branch Connections during Fatigue Loading

Sládek

Patek²,

Mičian

2017

Archives of Metallurgy and Materials

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show abstract

Numerical and experimental determination of stress concentration factor for a pipe branch model

et al. 2017

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Original scientific paper The subject of this paper is testing of complex geometrical structures, i.e. stress analysis of a pipe branch model of A6 third pipeline at Hydropower Plant Perućica, Nikšić. Analysis of pipe branch model stress distribution was carried out by using finite element method and experimental methods. Finite element method defined 3D pipe branch model. Numerical calculation defined critical locations on model, i.e. locations with the greatest stress concentration. Strain gauges were placed on identified critical locations. Measured stress values confirmed values obtained by using numerical calculation. Experimental measurements were also taken by using new digital image correlation (DIC) method. DIC method is an optical non-contact method that can provide full 3D stress field and enables better understanding of complex structures such as pipe branches. The aim of this paper was to determine stress concentration factor for the pipe branch model by using numerical and experimental analysis.Keywords: finite element method; pipe branch model; strain gauges; stress concentration factor; 3D DIC method Numeričko i eksperimentalno određivanje faktora koncentracije naprezanja na modelu cijevne račve Izvorni znanstveni članak Predmet ovog rada je ispitivanje struktura složene geometrije, odnosno analiza naprezanja modela cijevne račve A6 trećeg cjevovoda u hidroelektrani Perućica, Nikšić. Analiza stanja naprezanja modela cijevne račve provedena je numeričkom metodom konačnih elemenata i eksperimentalnim metodama. Metodom konačnih elemenata definiran je 3D model cijevne račve. Numeričkim putem određena su kritična mjesta na modelu, odnosno mjesta najveće koncentracije naprezanja. Mjerne trake su pozicionirane na identificirane kritične zone. Izmjerene vrijednosti naprezanja metodom mjernih traka potvrdile su vrijednosti dobivene metodom konačnih elemenata. Mjerenja su provedena i uporabom 3D optičke beskontaktne metode koja se bazira na digitalnoj korelaciji slika. Tom metodom se može dobiti cjelokupno 3D polje naprezanja, odnosno ona omogućava bolje razumijevanje kompleksnih struktura kao što su cijevne račve. Cilj ovog rada je bio određivanje faktora koncentracije narezanja na modelu cijevne račve uporabom numeričkog i eksperimentalnog pristupa.Ključne riječi: faktor koncentracije naprezanja; konačni elementi; mjerne trake; model cijevne račve; 3D DIC metoda

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Stress Indices for Non-Radial Branch Connections for Piping

Cited by 2 publications

References 1 publication

Behavior of Steel Branch Connections during Fatigue Loading

Behavior of Steel Branch Connections during Fatigue Loading

Numerical and experimental determination of stress concentration factor for a pipe branch model

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