Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints
Reactive Air Brazing (RAB) enables the joining of vacuum-sensitive oxide ceramics, such as Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> (BSCF), to metals in a one-step process. However, damage may form in...
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MDPI AG
2023-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/23/7265 |
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| author | Donat Rudenskiy Simone Herzog Lutz Horbach Nils Christian Gebhardt Felix Weber Anke Kaletsch Christoph Broeckmann |
| author_facet | Donat Rudenskiy Simone Herzog Lutz Horbach Nils Christian Gebhardt Felix Weber Anke Kaletsch Christoph Broeckmann |
| author_sort | Donat Rudenskiy |
| collection | DOAJ |
| description | Reactive Air Brazing (RAB) enables the joining of vacuum-sensitive oxide ceramics, such as Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> (BSCF), to metals in a one-step process. However, damage may form in ceramic or joint during RAB. In this work, experimental microstructure characterization, measurement, and prediction of local material properties using finite element analysis were combined to enlighten these damage mechanisms, which are currently not well understood. Micromechanical simulations were performed using representative volume elements. Cooling simulations indicate that small-sized CuO precipitations are most likely to cause crack initiation in BSCF during cooling. The ball-on-three-balls experiment with porous BSCF samples was analyzed numerically to determine the values of temperature-dependent BSCF fracture stresses. The inversely calibrated fracture stresses in the bulk BSCF phase are underestimated, and true values should be quite high, according to an extreme value analysis of pore diameters. |
| first_indexed | 2024-03-09T01:47:35Z |
| format | Article |
| id | doaj.art-10e322ec79cb419a96eefdb095611a00 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T01:47:35Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-10e322ec79cb419a96eefdb095611a002023-12-08T15:20:25ZengMDPI AGMaterials1996-19442023-11-011623726510.3390/ma16237265Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed JointsDonat Rudenskiy0Simone Herzog1Lutz Horbach2Nils Christian Gebhardt3Felix Weber4Anke Kaletsch5Christoph Broeckmann6Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyInstitute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyInstitute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyInstitute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyInstitute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyInstitute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyInstitute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, GermanyReactive Air Brazing (RAB) enables the joining of vacuum-sensitive oxide ceramics, such as Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> (BSCF), to metals in a one-step process. However, damage may form in ceramic or joint during RAB. In this work, experimental microstructure characterization, measurement, and prediction of local material properties using finite element analysis were combined to enlighten these damage mechanisms, which are currently not well understood. Micromechanical simulations were performed using representative volume elements. Cooling simulations indicate that small-sized CuO precipitations are most likely to cause crack initiation in BSCF during cooling. The ball-on-three-balls experiment with porous BSCF samples was analyzed numerically to determine the values of temperature-dependent BSCF fracture stresses. The inversely calibrated fracture stresses in the bulk BSCF phase are underestimated, and true values should be quite high, according to an extreme value analysis of pore diameters.https://www.mdpi.com/1996-1944/16/23/7265BSCFreactive air brazing (RAB)residual stressfracture strengthfinite element analysis (FEA)representative volume elements (RVEs) |
| spellingShingle | Donat Rudenskiy Simone Herzog Lutz Horbach Nils Christian Gebhardt Felix Weber Anke Kaletsch Christoph Broeckmann Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints Materials BSCF reactive air brazing (RAB) residual stress fracture strength finite element analysis (FEA) representative volume elements (RVEs) |
| title | Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints |
| title_full | Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints |
| title_fullStr | Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints |
| title_full_unstemmed | Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints |
| title_short | Numerical Modeling of Residual Stresses and Fracture Strengths of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> in Reactive Air Brazed Joints |
| title_sort | numerical modeling of residual stresses and fracture strengths of ba sub 0 5 sub sr sub 0 5 sub co sub 0 8 sub fe sub 0 2 sub o sub 3 δ sub in reactive air brazed joints |
| topic | BSCF reactive air brazing (RAB) residual stress fracture strength finite element analysis (FEA) representative volume elements (RVEs) |
| url | https://www.mdpi.com/1996-1944/16/23/7265 |
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