Coldworking Stress Archives - ESRD

StressCheck Tutorial: Incorporating CX Residual Stresses in SIF and J-integral Extractions

brent — Thu, 14 Jul 2022 01:21:28 +0000

Abstract: incorporating coldworked (CX) residual stresses in the computation of fracture mechanics parameters (SIF/J-integral). The following workflow is outlined:

Open existing 3D-Fracture Handbook model (CrackOpenHole-ResidualStresses.scw)
Add parameters, convert material to elastic-plastic, and modify the model boundary conditions for a cold-work simulation
Solve a linear solution, and then solve the cold-work simulation events via incremental plasticity
Use BRS mapping to map the cold-work solution to a new part
Assign BRS load and remote traction, convert material to linear-elastic, and modify constraints to represent the crack face
Solve a linear analysis and extract SIF's/J-integrals

Fatigue Life Modeling at CX and Interference Holes (from ERSI Workshop 2019)

brent — Wed, 30 Oct 2019 16:28:30 +0000

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.

StressCheck Tutorial: Isotropic vs Kinematic Hardening for Cold Worked Holes

brent — Sun, 22 Sep 2019 00:59:16 +0000

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3D Crack Growth Simulation: Advancements & Applications Webinar Slides

brent — Mon, 22 Jul 2019 14:48:53 +0000

In this webinar we will detail the latest technological advancements for accurate simulation of three-dimensional metallic crack growth via coupled finite element analysis (FEA) and fatigue life computations. Additionally, we will examine why the development of more complex crack growth models requires both tighter control over numerical errors (i.e. solution verification) and rigorous benchmarking to standard handbook solutions and available experimental data (i.e. model validation). To view the webinar, click here.

StressCheck Tutorial: Mapping Cold Working Residual Stresses to a Reamed Part via BRS Method

brent — Tue, 11 Dec 2018 21:43:15 +0000

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

StressCheck Demo: 3D Cold Working Analysis

brent — Mon, 10 Dec 2018 22:18:05 +0000

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StressCheck Tutorial: 2D vs 3D Cold Working Analysis of a Close Edge Distance Hole

brent — Fri, 07 Dec 2018 21:47:17 +0000

Abstract: Modeling of a 3"x5" titanium strip with a 0.45" diameter hole at a short edge distance (ED=1.5*D) from the right edge of the strip. The titanium's elastic-plastic material is described by a Ramberg-Osgood curve with pure isotropic hardening (i.e. (beta=0). The mandrel insertion/removal nonlinear event is simulated by normal springs + spring displacements. Planar (plane stress) and 3D (Extrude reference) models are solved via Incremental plasticity theory and residual stresses are studied.

StressCheck Tutorial: Checking ITP Viability for Solving Nonlinear Events

brent — Sun, 18 Nov 2018 19:10:42 +0000

Abstract: Case study for the checklist to determine the viability of performing Incremental theory of plasticity (ITP). Overload, unload, re-load and unload events studied for a U-shaped member under "pull apart" loads. Results between Deformation theory of plasticity (DPT), General nonlinear (geometric nonlinear + DPT) and IPT solutions for the initial overload event are compared.

StressCheck Tutorial: Animate a Sequence of Results

brent — Tue, 23 Oct 2018 16:18:48 +0000

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RS Crack Closure: Experimental Observations and Modeling (from ERSI Workshop 2018)

brent — Mon, 08 Oct 2018 18:25:53 +0000

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.