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Title: Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints

Abstract

A brazed joint consists of a low-melting point and thin interlayer sandwiched between the high-melting-point base materials, in which the interlayer strength is typically lower than that of the base material. When this butt-joined composite is loaded uniaxially in the direction perpendicular to the plane of the brazing layer, the tensile strength is found to be much higher than that of the braze. This seems to violate the iso-stress condition in such a butt-joint serial configuration. Furthermore, the stress triaxiality has been usually ascribed, but without a quantitative rationalization, as being responsible for this tensile strength enhancement. Here a complete finite element simulation has been conducted to study the dependence of triaxiality and strength enhancement on geometric and material parameters. Two asymptotic limit solutions (based on Bridgman and Xia–Shih solutions, respectively) have been identified to understand the simulation results. The critical role of void evolution has been revealed when making a quantitative comparison to available experiments. In addition, ductility of the brazed joint, which has not been fully addressed in literature, is investigated by the Gurson–Tvergaard–Needleman model.

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [5];  [6];  [3]
  1. China Univ. of Petroleum, Qingdao (China); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. China Univ. of Petroleum, Qingdao (China)
  5. The Ohio State Univ., Columbus, OH (United States)
  6. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
OSTI Identifier:
1661221
Grant/Contract Number:  
AC05-00OR22725; DMR-1809640; CMMI-1847630
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 51; Journal Issue: 11; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English

Citation Formats

Cai, Xin, Gao, Yanfei, Wang, Xue, Zhang, Wei, Liu, Wei, Shen, Xinpu, Zhang, Wei, Yu, Zhenzhen, and Feng, Zhili. Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints. United States: N. p., 2020. Web. doi:10.1007/s11661-020-05984-x.
Cai, Xin, Gao, Yanfei, Wang, Xue, Zhang, Wei, Liu, Wei, Shen, Xinpu, Zhang, Wei, Yu, Zhenzhen, & Feng, Zhili. Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints. United States. doi:10.1007/s11661-020-05984-x.
Cai, Xin, Gao, Yanfei, Wang, Xue, Zhang, Wei, Liu, Wei, Shen, Xinpu, Zhang, Wei, Yu, Zhenzhen, and Feng, Zhili. Sat . "Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints". United States. doi:10.1007/s11661-020-05984-x.
@article{osti_1661221,
title = {Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints},
author = {Cai, Xin and Gao, Yanfei and Wang, Xue and Zhang, Wei and Liu, Wei and Shen, Xinpu and Zhang, Wei and Yu, Zhenzhen and Feng, Zhili},
abstractNote = {A brazed joint consists of a low-melting point and thin interlayer sandwiched between the high-melting-point base materials, in which the interlayer strength is typically lower than that of the base material. When this butt-joined composite is loaded uniaxially in the direction perpendicular to the plane of the brazing layer, the tensile strength is found to be much higher than that of the braze. This seems to violate the iso-stress condition in such a butt-joint serial configuration. Furthermore, the stress triaxiality has been usually ascribed, but without a quantitative rationalization, as being responsible for this tensile strength enhancement. Here a complete finite element simulation has been conducted to study the dependence of triaxiality and strength enhancement on geometric and material parameters. Two asymptotic limit solutions (based on Bridgman and Xia–Shih solutions, respectively) have been identified to understand the simulation results. The critical role of void evolution has been revealed when making a quantitative comparison to available experiments. In addition, ductility of the brazed joint, which has not been fully addressed in literature, is investigated by the Gurson–Tvergaard–Needleman model.},
doi = {10.1007/s11661-020-05984-x},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 11,
volume = 51,
place = {United States},
year = {2020},
month = {9}
}

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