Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings

Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings

The influence of specimen twisting on Young's modulus of thermal barrier coatings (TBCs) was studied using four-point bending tests based on ISO 19477 and three-dimensional finite element analysis (3D FEM). Twisted substrate specimens were four-point bent using a jig with or without pin rot...

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Autores principales: Masahiko KATO, Yuuki MATSUO, Hiroyuki WAKI, Satoru TAKAHASHI, Hiroyuki AKEBONO, Atsushi SUGETA, Yoshitaka KOJIMA, Fumio ONO
Formato: article
Lenguaje:EN
Publicado: The Japan Society of Mechanical Engineers 2017
Materias:
thermal barrier coatings
young's modulus
twisting
four point bending test
finite element analysis
Mechanical engineering and machinery
TJ1-1570
Acceso en línea:https://doaj.org/article/91316b08561a410990f39d7ad92d61db
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spelling oai:doaj.org-article:91316b08561a410990f39d7ad92d61db2021-11-26T07:11:27ZInfluence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings2187-974510.1299/mej.16-00714https://doaj.org/article/91316b08561a410990f39d7ad92d61db2017-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_16-00714/_pdf/-char/enhttps://doaj.org/toc/2187-9745The influence of specimen twisting on Young's modulus of thermal barrier coatings (TBCs) was studied using four-point bending tests based on ISO 19477 and three-dimensional finite element analysis (3D FEM). Twisted substrate specimens were four-point bent using a jig with or without pin rotation to investigate the influence of pin contact conditions. The Young's modulus was calculated by strain gauge and maximum-displacement methods. The results showed that load-strain and load-maximum displacement curves of the twisted substrate specimens showed linear relationships for fixed and rotating pin conditions. The decrease in the Young's modulus with increasing twisting angle was not observed for the strain gauge method but was for the maximum-displacement method. However, the maximum decrease of around 5% for the maximum-displacement method was improved by pin rotation. 3D FEM results showed that the Young's modulus obtained by the FEM quantitatively agreed well with the experimental value. Analyzed strain distribution clarified the insensitivity to specimen twisting for the strain gauge method because of the small difference in the strain at the center of the specimen where the strain gauge was attached. The decrease in the Young's modulus of the twisted specimen for the maximum-displacement method corresponded to the inhomogeneous curvature distribution of the specimen. The influence of the specimen twisting of TBCs on Young's modulus was evaluated by 3D FEM. The same tendency as that for the substrate specimen was observed, but the amount of decrease became large. A decrease around 5 times larger than that for the substrate specimen was observed with a twisting angle of 0.058 by the maximum-displacement method under fixed pin conditions. However, the decrease was improved by pin rotation. The analysis result showed that the strain gauge method had sufficient accuracy to evaluate the Young's modulus of twisted TBC specimens up to a twisting angle of 0.058.Masahiko KATOYuuki MATSUOHiroyuki WAKISatoru TAKAHASHIHiroyuki AKEBONOAtsushi SUGETAYoshitaka KOJIMAFumio ONOThe Japan Society of Mechanical Engineersarticlethermal barrier coatingsyoung's modulustwistingfour point bending testfinite element analysisMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 16-00714-16-00714 (2017)
institution DOAJ
collection DOAJ
language EN
topic thermal barrier coatings
young's modulus
twisting
four point bending test
finite element analysis
Mechanical engineering and machinery
TJ1-1570
spellingShingle thermal barrier coatings
young's modulus
twisting
four point bending test
finite element analysis
Mechanical engineering and machinery
TJ1-1570
Masahiko KATO
Yuuki MATSUO
Hiroyuki WAKI
Satoru TAKAHASHI
Hiroyuki AKEBONO
Atsushi SUGETA
Yoshitaka KOJIMA
Fumio ONO
Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings
description The influence of specimen twisting on Young's modulus of thermal barrier coatings (TBCs) was studied using four-point bending tests based on ISO 19477 and three-dimensional finite element analysis (3D FEM). Twisted substrate specimens were four-point bent using a jig with or without pin rotation to investigate the influence of pin contact conditions. The Young's modulus was calculated by strain gauge and maximum-displacement methods. The results showed that load-strain and load-maximum displacement curves of the twisted substrate specimens showed linear relationships for fixed and rotating pin conditions. The decrease in the Young's modulus with increasing twisting angle was not observed for the strain gauge method but was for the maximum-displacement method. However, the maximum decrease of around 5% for the maximum-displacement method was improved by pin rotation. 3D FEM results showed that the Young's modulus obtained by the FEM quantitatively agreed well with the experimental value. Analyzed strain distribution clarified the insensitivity to specimen twisting for the strain gauge method because of the small difference in the strain at the center of the specimen where the strain gauge was attached. The decrease in the Young's modulus of the twisted specimen for the maximum-displacement method corresponded to the inhomogeneous curvature distribution of the specimen. The influence of the specimen twisting of TBCs on Young's modulus was evaluated by 3D FEM. The same tendency as that for the substrate specimen was observed, but the amount of decrease became large. A decrease around 5 times larger than that for the substrate specimen was observed with a twisting angle of 0.058 by the maximum-displacement method under fixed pin conditions. However, the decrease was improved by pin rotation. The analysis result showed that the strain gauge method had sufficient accuracy to evaluate the Young's modulus of twisted TBC specimens up to a twisting angle of 0.058.
format article
author Masahiko KATO
Yuuki MATSUO
Hiroyuki WAKI
Satoru TAKAHASHI
Hiroyuki AKEBONO
Atsushi SUGETA
Yoshitaka KOJIMA
Fumio ONO
author_facet Masahiko KATO
Yuuki MATSUO
Hiroyuki WAKI
Satoru TAKAHASHI
Hiroyuki AKEBONO
Atsushi SUGETA
Yoshitaka KOJIMA
Fumio ONO
author_sort Masahiko KATO
title Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings
title_short Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings
title_full Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings
title_fullStr Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings
title_full_unstemmed Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings
title_sort influence of substrate twisting on young's modulus measured by four-point bending test for thermal barrier coatings
publisher The Japan Society of Mechanical Engineers
publishDate 2017
url https://doaj.org/article/91316b08561a410990f39d7ad92d61db
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