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Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints

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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. 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.

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Data contained in this paper are available upon request to the corresponding authors.

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Acknowledgments

This work has been supported by the China Scholarship Council (XC), the US National Science Foundation DMR-1809640 (YFG) and CMMI-1847630 (ZZY), the Center for Materials Processing at University of Tennessee (XW), and the US Department of Energy, Office of Vehicle Technology, under a prime contract with Oak Ridge National Laboratory (WZ and ZLF).

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Authors and Affiliations

  1. School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, China

    Xin Cai, Wei Liu & Xinpu Shen

  2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA

    Xin Cai, Yanfei Gao & Xue Wang

  3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Wei Zhang & Zhili Feng

  4. Department of Materials Science and Engineering, Ohio State University, Columbus, OH, 43210, USA

    Wei Zhang

  5. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, 80401, USA

    Zhenzhen Yu

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  1. Xin Cai
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  2. Yanfei Gao
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Correspondence to Yanfei Gao, Wei Liu, Zhenzhen Yu or Zhili Feng.

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Manuscript submitted March 12, 2020.

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Cai, X., Gao, Y., Wang, X. et al. Triaxial Constraint and Tensile Strength Enhancement in Brazed Joints. Metall Mater Trans A 51, 5587–5596 (2020). https://doi.org/10.1007/s11661-020-05984-x

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  • DOI: https://doi.org/10.1007/s11661-020-05984-x

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