Ratchetting and Creep Failure in Twin-Wall Turbine Blades Experiencing Severe Thermal and Centrifugal Loading
نویسندگان
چکیده
Abstract Twin-wall structures can be cooled both externally and internally, raising great potential for use in high-temperature applications. However, their increased geometric complexity imposes a range of failure mechanisms consideration design. The primary aim this study is to identify the nature such by constructing Bree type interaction diagrams idealized double-wall systems under cyclic thermomechanical loading that shows combination conditions which plasticity (leading fatigue failure)-creep ratchetting occur. Through an extension classical analysis, we determine analytical boundaries between different regimes behavior. We also quantify effects wall thickness ratio, temperature field, yield creep material properties. Local shown dominate over structural/global when strength reduces with and/or gradient through hot dominates difference walls. Thus, conclude global unlikely occur practical Nickel-based twin-wall turbine blades, but instead these suffer from local at cooling holes excessive deformation. This verified 3D finite element (FE) simulations, demonstrating approach provides powerful, cost-effective strategy providing physical insight into possible deformation thin-walled components; highlighting key trade-offs considered design; directing computer methods toward more detailed calculations.
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ژورنال
عنوان ژورنال: Journal of Applied Mechanics
سال: 2022
ISSN: ['0021-8936', '1528-9036']
DOI: https://doi.org/10.1115/1.4054968