Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding
Repair welding is an important remediation process for castings with slight defects. In this paper, the tensile behaviors of the QT400-18 nodular cast iron with different repair welding sizes were experimentally analyzed. Specimens with different diameters of the filler region were prepared by the s...
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Series: | Mathematical Problems in Engineering |
Online Access: | http://dx.doi.org/10.1155/2019/5737029 |
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doaj-da191fd738204ec59dbf6e66220d72d12020-11-25T01:18:05ZengHindawi LimitedMathematical Problems in Engineering1024-123X1563-51472019-01-01201910.1155/2019/57370295737029Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair WeldingTao Wei0Wei Liu1Wenxuan Gou2Junqiang Kou3School of Mechanics, Civil Eng. & Architecture, Northwestern Polytechnical University, Xi’an 710129, ChinaSchool of Mechanics, Civil Eng. & Architecture, Northwestern Polytechnical University, Xi’an 710129, ChinaSchool of Mechanics, Civil Eng. & Architecture, Northwestern Polytechnical University, Xi’an 710129, ChinaNorthwest Industries Group Co., Ltd., Xi’an 710043, ChinaRepair welding is an important remediation process for castings with slight defects. In this paper, the tensile behaviors of the QT400-18 nodular cast iron with different repair welding sizes were experimentally analyzed. Specimens with different diameters of the filler region were prepared by the same welding process. The fracture initiated in the filler region under uniaxial tensile loading. The modulus, strength, and ductility decreased with the weld diameter increase. The postyield hardening phenomenon was not observed in the repaired specimen. The repair region ratio was defined as the proportion of the repair welding area to the cross-sectional area of the structure. The effective modulus of the repaired specimens decreased with the repair region ratio increase, and the relationship between them was fitted by a negative exponential function. The repair welding region was treated as an inclusion in the matrix of castings, and the volume fraction of inclusion was applied to characterize the repair welding size. Based on the theories of Eshelby tensor and Mori–Tanaka equivalent method, a method for estimating macroscopic effective modulus of repair welding castings was established. The theoretical solutions were in good agreement with the experimental results. The method will be helpful in estimating the safe service limit of repair welded castings.http://dx.doi.org/10.1155/2019/5737029 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tao Wei Wei Liu Wenxuan Gou Junqiang Kou |
spellingShingle |
Tao Wei Wei Liu Wenxuan Gou Junqiang Kou Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding Mathematical Problems in Engineering |
author_facet |
Tao Wei Wei Liu Wenxuan Gou Junqiang Kou |
author_sort |
Tao Wei |
title |
Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding |
title_short |
Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding |
title_full |
Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding |
title_fullStr |
Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding |
title_full_unstemmed |
Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding |
title_sort |
effective modulus estimation method of qt400-18 cast iron with repair welding |
publisher |
Hindawi Limited |
series |
Mathematical Problems in Engineering |
issn |
1024-123X 1563-5147 |
publishDate |
2019-01-01 |
description |
Repair welding is an important remediation process for castings with slight defects. In this paper, the tensile behaviors of the QT400-18 nodular cast iron with different repair welding sizes were experimentally analyzed. Specimens with different diameters of the filler region were prepared by the same welding process. The fracture initiated in the filler region under uniaxial tensile loading. The modulus, strength, and ductility decreased with the weld diameter increase. The postyield hardening phenomenon was not observed in the repaired specimen. The repair region ratio was defined as the proportion of the repair welding area to the cross-sectional area of the structure. The effective modulus of the repaired specimens decreased with the repair region ratio increase, and the relationship between them was fitted by a negative exponential function. The repair welding region was treated as an inclusion in the matrix of castings, and the volume fraction of inclusion was applied to characterize the repair welding size. Based on the theories of Eshelby tensor and Mori–Tanaka equivalent method, a method for estimating macroscopic effective modulus of repair welding castings was established. The theoretical solutions were in good agreement with the experimental results. The method will be helpful in estimating the safe service limit of repair welded castings. |
url |
http://dx.doi.org/10.1155/2019/5737029 |
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