Residual Stress Modules Archives - ESRD https://www.esrd.com/product-category/stresscheck-professional/advanced-modules/residual-stress-modules/ Engineering Software Research and Development, Inc. Thu, 14 Jul 2022 13:40:48 +0000 en-US hourly 1 https://wordpress.org/?v=6.7.1 https://www.esrd.com/wp-content/uploads/cropped-SC_mark_LG72ppi-32x32.jpg Residual Stress Modules Archives - ESRD https://www.esrd.com/product-category/stresscheck-professional/advanced-modules/residual-stress-modules/ 32 32 StressCheck Tutorial: Incorporating CX Residual Stresses in SIF and J-integral Extractions https://www.esrd.com/resource-library/product/stresscheck-tutorial-incorporating-cx-residual-stresses-in-sif-and-j-integral-extractions/ Thu, 14 Jul 2022 01:21:28 +0000 https://www.esrd.com/?post_type=product&p=25522 Abstract: incorporating coldworked (CX) residual stresses in the computation of fracture mechanics parameters (SIF/J-integral). The following workflow is outlined:
  1. Open existing 3D-Fracture Handbook model (CrackOpenHole-ResidualStresses.scw)
  2. Add parameters, convert material to elastic-plastic, and modify the model boundary conditions for a cold-work simulation
  3. Solve a linear solution, and then solve the cold-work simulation events via incremental plasticity
  4. Use BRS mapping to map the cold-work solution to a new part
  5. Assign BRS load and remote traction, convert material to linear-elastic, and modify constraints to represent the crack face
  6. Solve a linear analysis and extract SIF's/J-integrals
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]]> Efficient Shaping or Reshaping of Complex 3D Parts Using Engineered Residual Stress https://www.esrd.com/resource-library/product/efficient-shaping-or-reshaping-of-complex-3d-parts-using-engineered-residual-stress/ Fri, 27 Mar 2020 21:55:22 +0000 https://esrd.com/?post_type=product&p=13452 Abstract: A model was developed for solving the inverse problem of distortion.
  • Significant improvement in overall shape of the validation part was observed.
    • Demonstrated good predictive performance for the inverse problem of reshaping.
  • The extreme distortion in a partially-peened state was predictable.
  • The difference between the predicted final shape and the actual final shape was less than the difference between the actual final shape and the target shape.
    • Demonstrated good predictive performance for the forward problem of reshaping.
  Originally presented at the Residual Stress Summit 2017 in Dayton, OH.]]>
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]]> Fatigue Life Modeling at CX and Interference Holes (from ERSI Workshop 2019) https://www.esrd.com/resource-library/product/fatigue-life-modeling-at-cx-and-interference-holes-from-ersi-workshop-2019/ Wed, 30 Oct 2019 16:28:30 +0000 https://esrd.com/?post_type=product&p=11988 Abstract: Continuation of previous year’s work by AP/ES and ESRD on crack closure. Additionally, a task evolved from USAF goals dictated at ERSI 2018 to study the residual stress redistribution at interference filled holes. The goal of this new task was to better understand interference fit fasteners and their interaction with residual stresses from cold-working (CX). Originally presented at the Engineered Residual Stress Implementation (ERSI) Workshop 2019 in Clearfield, UT.]]>
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]]> Application Brief: Predictive Reshaping Using Surface Treatments https://www.esrd.com/resource-library/product/application-brief-predictive-reshaping-using-surface-treatments/ Tue, 13 Aug 2019 18:25:59 +0000 https://esrd.com/?post_type=product&p=11301 Read our application brief on the analytical capabilities in StressCheck Professional for predicting and correcting distortion problems due to surface treatments. Reliable predictive reshaping is possible for a variety of processes, resulting in increased part production capabilities and lower rejection rates of finished parts.]]>
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Application-Tech-Brief-Predictive-Reshaping.pdf - 2.72 MB ]]> StressCheck Tutorial: Mapping Cold Working Residual Stresses to a Reamed Part via BRS Method https://www.esrd.com/resource-library/product/stresscheck-tutorial-mapping-cold-working-residual-stresses-to-reamed-part-via-brs-method/ Tue, 11 Dec 2018 21:43:15 +0000 https://esrd.com/?post_type=product&p=8615 Abstract: Mapping residual stresses generated by cold working to a reamed part via Bulk Residual Stress (BRS) mapping and loading methods. Using Solution Configurations + Parts and the StressCheck BRS Module to:
  • Solve a Cold Working (CX) analysis via Incremental theory of plasticity and Nonlinear Events
  • Map the post-CX residual stress distribution to the reamed part using BRS mapping
  • Apply the BRS-mapped stress distribution to the reamed part as a new load case
  • Solve for stress redistribution in the reamed part.
  For more details on the above methods: Helpful Hints and Tips: Cold Working and Reaming]]>
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]]> RS Crack Closure: Experimental Observations and Modeling (from ERSI Workshop 2018) https://www.esrd.com/resource-library/product/rs-crack-closure-experimental-observations-and-modeling-ersi-workshop-2018/ Mon, 08 Oct 2018 18:25:53 +0000 https://esrd.com/?post_type=product&p=8058 Abstract: Analytical methods are needed to account for crack closure due to residual stress (RS) fields. Crack growth data from CX holes at multiple applied stress ratios developed by Analytical Processes/Engineered Solutions, Inc. (AP/ES) and Southwest Research Institute (SwRI) has shown a definite response to applied stress ratio with the data strongly suggesting that crack closure is an active mechanism. Closure is suspected to be one major contributor to discrepancies between predicted and observed crack growth behavior in the presence of RS fields. This presentation reports on the progress made by AP/ES and ESRD in the evaluation of the experimental data and the modeling of closure.]]>
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]]> Fatigue Life Prediction of Flaw-Tolerant Damaged Rotorcraft Structures https://www.esrd.com/resource-library/product/fatigue-life-prediction-of-flaw-tolerant-damaged-rotorcraft-structures/ Thu, 05 Jul 2018 17:05:43 +0000 https://esrd.com/?post_type=product&p=7289 Abstract: Paper presented at the American Helicopter Society Annual Forum 74 in Phoenix, Arizona May 14-17, 2018: Fatigue Life Prediction of Flaw-Tolerant Damages Rotorcraft Structures. The presentation and paper report the work done by ESRD and NAVAIR under a SBIR program to develop an analytical approach to predicting the remaining useful fatigue life of metallic components with surface flaws.]]>
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]]> Helpful Hints and Tips: Cold Working and Reaming https://www.esrd.com/resource-library/product/helpful-hints-and-tips-cold-working-and-reaming/ Tue, 20 Mar 2018 19:13:30 +0000 https://esrd.com/?post_type=product&p=6381 Abstract: 3D cold working nonlinear analysis followed by the mapping of the nonlinear residual stresses to a reamed version of a dogbone specimen using the Bulk Residual Stress (BRS) module.]]>
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]]> Pros and Cons of 3D Crack Growth Simulation using Finite Elements https://www.esrd.com/resource-library/product/pros-cons-3d-crack-growth-simulation-using-finite-elements/ Fri, 01 Dec 2017 16:44:28 +0000 https://esrd.com/?post_type=product&p=5153 Abstract: Recent advances in fatigue crack growth simulation technology make it possible to predict crack size and shape as a function of load cycles for more complex structural configurations than previously possible. These technology advances, often based on computing stress intensity factors (SIFs) using the finite element method (FEM), allow the removal of many of the limiting assumptions previously required for analysis but also introduce new sources of error (the errors of approximation) which must be considered and controlled for effective use of numerical simulation in the prediction of fatigue life. Originally presented as a track presentation at the 2017 ASIP conference in Jacksonville, FL.]]>
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]]> Crack Propagation Analysis Tool for 3D Crack Simulation: A Simulation App Case Study https://www.esrd.com/resource-library/product/crack-propagation-analysis-tool-3d-crack-simulation-sim-app-case-study/ Fri, 01 Dec 2017 16:34:18 +0000 https://esrd.com/?post_type=product&p=5148 Abstract: This 2 hour course will provide instructions for using the Crack Propagation Analysis Tool (CPAT) to simulate 3D crack growth at a fastener hole in a fatigue test specimen. Residual stresses due to cold-working of the hole are taken into account. CPAT provides an easy-to-use interface which significantly reduces the manual effort involved in complex crack growth simulations using the finite element method. Finite element solutions are computed using the StressCheck solver, renowned in the aerospace finite element analysis community for extracting high quality stress intensity factors (SIFs) for complex parts and assemblies. Originally presented as a training course at the 2017 ASIP conference in Jacksonville, FL.]]>
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