StressCheck API Archives - ESRD https://www.esrd.com/product-tag/stresscheck-api/ Engineering Software Research and Development, Inc. Thu, 07 Dec 2023 16:59:08 +0000 en-US hourly 1 https://wordpress.org/?v=6.6.2 https://www.esrd.com/wp-content/uploads/cropped-SC_mark_LG72ppi-32x32.jpg StressCheck API Archives - ESRD https://www.esrd.com/product-tag/stresscheck-api/ 32 32 Experimental Validation of DTA Modeling of Bonded Wing Skin Repairs https://www.esrd.com/resource-library/product/experimental-validation-of-dta-modeling-of-bonded-wing-skin-repairs/ Thu, 07 Dec 2023 16:41:37 +0000 https://www.esrd.com/?post_type=product&p=30469 Abstract: This presentation is a follow-up to ESRD’s 2022 ASIP presentation titled “DTA of Bonded Repairs on the Wing Skin of the C-130 Using Finite Elements.” That presentation explored a robust method for finite element analysis of bonded skin repairs from the perspective of both static strength and fatigue crack growth. The proposed analysis methodology was presented in a comparative sense, examining a number of criteria in the skin in an undamaged state, a damaged state and a repaired state, in order to allow the analyst to make an assessment of repair effectiveness without detailed knowledge of either the exact boundary conditions of the problem, or of the intricacies of the model itself. One of the criteria for a patch to be deemed effective is that the fatigue life of the skin be at or above that of the pristine configuration. Given the sparse nature of research on the topic of crack growth under bonded repair patches, ESRD partnered with AP/ES to conduct an experimental program to investigate in detail how a small initial flaw propagates in the aluminum skin under a titanium repair up through failure. Experiments were performed alongside blind predictions of life and crack morphology using ESRD’s research tool, CPAT. Additionally, statistical analysis was performed to assess confidence in the predictions. Given the aleatory uncertainty associated with the available crack growth data for the specimen material, it was important that predictions of fatigue life be accompanied by a confidence level when comparing them with experimental outcomes. Because most of the crack propagation occurred under the repair, a marker band spectrum was used during the test and the crack-cycle data was constructed from fractographic examination. The experimental program covered three specimen configurations: (1) Undamaged skin with a surface crack or a corner crack at a hole; (2) Skin with a grindout (to remove hypothetical corrosion damage) and either a surface crack at the bottom of the grindout or a corner crack at a hole located at the center of the grindout; (3) Same as configuration (2) but including a bonded titanium repair. Experimental and predicted results will be presented. Originally presented as a technical paper at the 2023 ASIP conference in Denver, CO.]]>
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]]> DTA of Bonded Repairs on the Wing Skin of the C130 Using Finite Elements https://www.esrd.com/resource-library/product/dta-of-bonded-repairs-on-the-wing-skin-of-the-c130-using-finite-elements/ Thu, 08 Dec 2022 18:01:39 +0000 https://www.esrd.com/?post_type=product&p=26592 Abstract: Current methodologies for the design and application of repairs to damaged sections of aircraft wing skin can be lacking in analytical support, relying instead on accumulated practical experience to determine the effectiveness of a given patch design. These methods are, by their nature, effective, being based on observation, but inefficient, requiring a knowledge base acquired over years of experience. This can make sustainment organizations inflexible and vulnerable to gaps in knowledge between newer members and more seasoned experts. This approach is also problematic in its potential for wasted effort and material, applying repairs that may be more intensive than is required for a given situation. These problems can all be addressed by the introduction of an accessible, robust analysis methodology cast in the form of an Engineering Simulation Application for the verification of a repair’s performance qualities prior to an actual aircraft application. The finite element method is ideally suited to provide an analysis procedure for this type of problems that can be used by analysts with widely varying degrees of expertise both in numerical simulation and bonded repair application. This presentation will outline a proposed methodology for utilizing finite element analysis to assess the effectiveness of a given bonded repair. Originally presented as a technical paper at the 2022 ASIP conference in Phoenix, AZ.]]>
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]]> ASIP 2022 Training – Best Practices for the Modeling and Analysis of Bonded Doubler Repairs https://www.esrd.com/resource-library/product/asip-2022-training-best-practices-for-the-modeling-and-analysis-of-bonded-doubler-repairs/ Mon, 05 Dec 2022 15:01:02 +0000 https://www.esrd.com/?post_type=product&p=26512 Abstract: this 2-hour training course, originally presented at the ASIP 2022 conference in Phoenix, AZ, explored the following topics:
  • StressCheck’s FEA technology implementation enabling modeling of very thin domains, including adhesive layers with 3D-solid elements.
  • Best practices and guidelines for modeling and analyzing 3D bonded repair doubler variations (e.g. racetrack/rectangular, circular/elliptical, tapered, metallic, ply-by-ply, homogenized, etc.) for circular cutouts and grindouts.
  • Performing “what if?” logic-driven studies of a digital 3D bonded repair handbook solution via StressCheck API-powered Engineering Simulation App, in which user-defined input data is passed from Python or Excel VBA to StressCheck Professional to perform scripted “on-the-fly” model adjustments and repair-oriented computations.
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]]> StressCheck Tutorial: Incrementing a Thru-Crack in a Filled Hole via Excel VBA https://www.esrd.com/resource-library/product/stresscheck-tutorial-incrementing-a-thru-crack-in-a-filled-hole-via-excel-vba/ Tue, 26 Jul 2022 16:13:25 +0000 https://www.esrd.com/?post_type=product&p=25646 Abstract: designing and executing an Excel VBA-based Simulation App for the computation of thru-crack SIF's in the vicinity of a filled hole represented by a fastener element. The model used for the tutorial (CrackedLug.scw) is found in the 2D-Fracture Handbook, and the Excel macro can be downloaded from the link below the video.  ]]>
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]]> ASIP 2021 Training – Standardization and Automation of DaDT Solutions via FEA-Based Sim Apps https://www.esrd.com/resource-library/product/asip-2021-training-standardization-and-automation-of-dadt-solutions-via-fea-based-sim-apps/ Wed, 15 Dec 2021 02:16:03 +0000 https://www.esrd.com/?post_type=product&p=23464 Abstract: this 4-hour training course, originally presented at the ASIP 2021 conference in Austin, TX, explored the following topics:
  • The construction of a custom digital DaDT handbook solution via StressCheck Professional, including the parametrization of model input data and the storage of application-specific results extractions (i.e. SIF’s).
  • An overview of CAE Handbook, including pre-existing digital DaDT handbook solutions and how custom digital DaDT handbook solution may be utilized in a friendly, fail-safe environment.
  • Performing “what if?” logic-driven studies of digital DaDT handbook solution via a StressCheck API-powered Sim App, in which user-defined input data is passed from Excel VBA to StressCheck Professional to perform scripted “on-the-fly” model adjustments and DaDT computations.
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]]> Helpful Hints and Tips: Advanced StressCheck Automation – Model Editing & Updating (Python) https://www.esrd.com/resource-library/product/helpful-hints-and-tips-advanced-stresscheck-automation-model-editing-updating-python/ Mon, 30 Aug 2021 19:18:04 +0000 https://www.esrd.com/?post_type=product&p=22359 Abstract: Python script and output files associated with the exercise found in Advanced StressCheck Automation: Model Editing & Updating.]]>
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]]> Helpful Hints and Tips: Advanced StressCheck Automation – Model Editing & Updating (Excel VBA) https://www.esrd.com/resource-library/product/helpful-hints-and-tips-advanced-stresscheck-automation-model-editing-updating-excel-vba/ Mon, 30 Aug 2021 19:08:41 +0000 https://www.esrd.com/?post_type=product&p=22354 Abstract: Excel VBA script and output files associated with the exercise found in Advanced StressCheck Automation: Model Editing & Updating.]]>
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]]> Helpful Hints and Tips: Advanced StressCheck Automation – Model Setup & Analysis (Python) https://www.esrd.com/resource-library/product/helpful-hints-and-tips-advanced-stresscheck-automation-model-setup-analysis-python/ Mon, 30 Aug 2021 19:03:02 +0000 https://www.esrd.com/?post_type=product&p=22348 Abstract: Python script and output files associated with the exercise found in Advanced StressCheck Automation: Model Setup & Analysis.]]>
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]]> Helpful Hints and Tips: Advanced StressCheck Automation – Model Setup & Analysis (Excel VBA) https://www.esrd.com/resource-library/product/helpful-hints-and-tips-advanced-stresscheck-automation-model-setup-analysis-excel-vba/ Mon, 30 Aug 2021 18:42:08 +0000 https://www.esrd.com/?post_type=product&p=22343 Abstract: Excel VBA script and output files associated with the exercise found in Advanced StressCheck Automation: Model Setup & Analysis.]]>
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]]> Helpful Hints and Tips: Automation Fundamentals (Python) https://www.esrd.com/resource-library/product/helpful-hints-and-tips-automation-fundamentals-python/ Mon, 30 Aug 2021 18:32:04 +0000 https://www.esrd.com/?post_type=product&p=22336 Abstract: Python script associated with the exercise found in StressCheck Automation Fundamentals.]]>
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