Experimental and numerical study of globe valve housing

Nenad Mitrovic,Nikola Momcilovic,Aleksandar Petrovic,Milos Milosevic,Zarko Miskovic,Tasko Maneski,Predrag Popovic

doi:10.2298/hemind160516035m

Nenad Mitrovic, Nikola Momcilovic + Show 5 more

Open Access

https://doi.org/10.2298/hemind160516035m

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Journal: Hemijska industrija	Publication Date: Jan 1, 2017
Citations: 15	License type: CC BY 4.0

Affiliation: University of Belgrade

Abstract

Complex structure experimental analysis has always been a huge challenge for researchers. Conventional experimental methods (e.g., strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. A 3D Digital Image Correlation method is an optical method that overcomes the limitations of conventional methods and enables full-field displacement and strain measurement of geometrically complex structures. System Aramis, based on Digital Image Correlation method, is used for experimental analysis and numerical model verification in this paper. Investigated complex structure is sphere/cylinder junction on globe valve housing subjected to axial loading. The highest experimentally measured von Mises strain values around 0.15% are recorded on cylinder/sphere intersection. Von Mises strain values on cylindrical and spherical part are several times smaller than on intersection itself. It is important to emphasize that, to the authors? best knowledge, this is the first paper showing experimental results of 3D full and strain field of geometrically complex structure (sphere/cylinder intersection) on the intersection itself on pressure equipment. It is proven that 3D Digital Image Correlation method is fast and versatile method for recording strain during loading of complex structures.

Highlights

Complex structure experimental analysis has always been a huge challenge for researchers
Previous studies in the field of pressure equipment [28], i.e., measuring and determining stress and strain of geometrically complex structures, have relied on analytical calculations based on shell theory, numerical calculations using computer software and conventional experimental methods
The aim of this paper is to analyze complex structure, i.e., sphere/cylinder intersection subjected to axial loading using full-field experimental 3D Digital Image Correlation (DIC) method and numerical strain and stress data

Summary

Introduction

Complex structure experimental analysis has always been a huge challenge for researchers. Conventional experimental methods (e.g., strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. A 3D Digital Image Correlation method is an optical method that overcomes the limitations of conventional methods and enables full-field displacement and strain measurement of geometrically complex structures. Typical globe valve housing has complex structure, a geometrical discontinuity that consists of sphere/cylinder intersection. Previous studies in the field of pressure equipment [28], i.e., measuring and determining stress and strain of geometrically complex structures (sphere/cylinder intersection), have relied on analytical calculations based on shell theory, numerical calculations using computer software and conventional experimental methods. The 3D Digital Image Correlation (DIC) [9,10,11] method overcomes limitations of conventional experimental methods (e.g., strain gauge) and enables full-field displacement and strain measurement. One experimental measurement enables acquisition of large datasets that replaces large number of strain gauges

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