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| Abstract No.: |
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Scheduled at:
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Wednesday, May 22, 2019, Saal Brüssel 11:40 AM
Properties of brazed joints 2
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| Title: |
Exploring the stress state of brazed single lap-joints using FEA simulations
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| Authors: |
David Kemmenoe* / Cornell University, USA
Eric Theisen / Metglas Inc., USA
William Coughlan/ Metglas Inc., USA
Shefford Baker/ Cornell University Material Science and Engineering, USA
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| Abstract: |
Tensile tests of single lap-joints (SLJs) are widely used to evaluate the shear strength of brazing alloys due to this tests easy implementation and the SLJs similarity to many real braze joints. Average shear strength, calculated as failure load divided by joined area (AWS C3.2), is commonly used as an indicator of joint strength, but assuming SLJ failure is caused by an average shear stress state is overly simplistic. Stress concentrations at overlap ends and complex braze microstructures, especially in braze fillets, result in stress distributions that are far from the often-assumed average shear. In this work, we use finite element simulations to explore the SLJ stress state and the resulting failure modes. We combine the simulated stress state with experimental observations of 316 stainless steel joined with a nickel braze to provide insights that aid in the interpretation of experimental SLJ data.
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