PSI - Issue 28

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ScienceDirect

Procedia Structural Integrity 28 (2020) 2304–2311 Structural Integrity Procedia 00 (2020) 000–000 Structural Integrity Procedia 0 (20 0) 000–000

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© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Fatigue crack growth life assessment is an important task in damage tolerant design practices. Being able to assess variability of crack propagation path and remaining useful life requires both deterministic and probabilistic modeling capabilities. Three dimensional fatigue crack growth finite element modeling and Radial Basis Function based Response Surface modeling is shown to be an accurate and e ffi cient route to predict crack propagation path in uncertainty quantification studies. A mixed-mode fatigue crack growth experimental measurement from literature is used for validation purposes and for quantifying crack path sensitiv ity due to o ff -nominal specimen geometry. Two sets of deterministic 3D crack propagation simulations are performed to relate geometric deviations to crack path predictions: first set is used to calibrate the response surface model while the second for veri fication purposes. Once verification requirements are satisfied, the response surface model can be employed in Monte Carlo type probabilistic simulations. c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativec mmons.org / licenses / by-nc-nd / 4.0 / ) er-review under responsibility of the European Structural Integrity Society (ESIS) ExCo. Keywords: Fatigue crack growth simulation; uncertainty quantification; response surface modeling; remaining useful life; 3D finite element modeling; probabilistic structural life assessment; 1st Virtual European Conference on Fracture Application of Response Surface ethod in Probabilistic Fatigue Crack Propagation Life Assessment using 3D FEA Adrian Loghin a, ∗ , Shakhrukh Ismonov b a Simmetrix Inc., Clifton Park, NY, USA b Jacobs Technologies Inc., Houston, TX, USA Abstract Fatigue crack growth life assessment is an important task in damage tolerant design practices. Being able to assess variability of crack propagation path and remaining useful life requires both deterministic and probabilistic modeling capabilities. Three dimensional fatigue crack growth finite element modeling and Radial Basis Function based Response Surface modeling is shown to be an accurate and e ffi cient route to predict crack propagation path in uncertainty quantification studies. A mixed-mode fatigue crack growth experimental measurement from literature is used for validation purposes and for quantifying crack path sensitiv ity due to o ff -nominal specimen geometry. Two sets of deterministic 3D crack propagation simulations are performed to relate geometric deviations to crack path predictions: first set is used to calibrate the response surface model while the second for veri fication purposes. Once verification requirements are satisfied, the response surface model can be employed in Monte Carlo type probabilistic simulations. c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo. Keywords: Fatigue crack growth simulation; uncertainty quantification; response surface modeling; remaining useful life; 3D finite element modeling; probabilistic structural life assessment; 1st Virtual European Conference on Fracture Application of Response Surface Method in Probabilistic Fatigue Crack Propagation Life Assessment using 3D FEA Adrian Loghin a, ∗ , Shakhrukh Ismonov b a Simmetrix Inc., Clifton Park, NY, USA b Jacobs Technologies Inc., Houston, TX, USA

1. Introduction 1. Introduction

In fatigue crack growth life assessments, a 3D FEM representation of the structure is desired since it provides accuracy to the assessment but it comes with a high runtime cost which might make it impractical in probabilistic studies. 3D FEA does have several benefits that are worth considering in developing accurate probabilistic life as sessment techniques: FEA is well-adopted across di ff erent industries, many commercial and non-commercial FEA packages are available, trained personnel to perform these simulations, existing design database (CAD, FEM) and de sign practices that can be leveraged. A robust remeshing technique coupled with existing FE solvers (Loghin (2018)) for simulating crack propagation at the component level takes advantage of these benefits to allow engineers perform In fatigue crack growth life assessments, a 3D FEM representation of the structure is desired since it provides accuracy to the assessment but it comes with a high runtime cost which might make it impractical in probabilistic studies. 3D FEA does have several benefits that are worth considering in developing accurate probabilistic life as sessment techniques: FEA is well-adopted across di ff erent industries, many commercial and non-commercial FEA packages are available, trained personnel to perform these simulations, existing design database (CAD, FEM) and de sign practices that can be leveraged. A robust remeshing technique coupled with existing FE solvers (Loghin (2018)) for simulating crack propagation at the component level takes advantage of these benefits to allow engineers perform

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.077 ∗ Corresponding author. E-mail address: loghin@simmetrix.com 2210-7843 c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review u der responsibility of the European Structural Integrity Society (ESIS) ExCo. ∗ Corresponding author. E-mail address: loghin@simmetrix.com 2210-7843 c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo.