Benchmarking of composite progressive damage analysis methods: The background

2016 ◽  
Vol 51 (10) ◽  
pp. 1325-1331 ◽  
Author(s):  
Stephen B Clay ◽  
Stephen P Engelstad
Keyword(s):  
Air Force ◽  
Research Laboratory ◽  
Tolerance Analysis ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Damage Growth ◽  
Analysis Methods ◽  
Composite Damage ◽  
Damage Tolerance Analysis ◽  
Air Force Research Laboratory

This article introduces an Air Force Research Laboratory study, which performed static and fatigue benchmark exercises for nine composite progressive damage analysis methods. Air Force Research Laboratory is interested in exploring the feasibility of these progressive damage analysis methods to predict composite damage growth for the purposes of improved durability and damage tolerance analysis of composite aircraft structure. This article gives the background, goals, motivation, and guiding principles of the study and provides brief descriptions of the teams that participated and the tools that were utilized.

Comparison of composite damage growth tools for static behavior of notched composite laminates

2016 ◽  
Vol 51 (10) ◽  
pp. 1493-1524 ◽  
Author(s):  
Stephen P Engelstad ◽  
Stephen B Clay
Keyword(s):  
Air Force ◽  
Composite Laminates ◽  
Fatigue Loading ◽  
Lessons Learned ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Damage Growth ◽  
Composite Damage ◽  
Open Hole ◽  
Air Force Research Laboratory

This paper provides overall comparisons of the static results of an Air Force Research Laboratory exploration into the state of the art of existing technology in composite progressive damage analysis. In this study, blind and re-calibration bench-marking exercises were performed using nine different composite progressive damage analysis codes on unnotched and notched (open-hole) composite coupons under both static and fatigue loading. This paper summarizes the results of the static portion of this program. Comparisons are made herein of specimen stiffness and strength predictions against each other and the test data. Overall percent error data is presented, as well as a list of observations and lessons learned during this year-long effort.

Experimental results of quasi-static testing for calibration and validation of composite progressive damage analysis methods

2016 ◽  
Vol 51 (10) ◽  
pp. 1333-1353 ◽  
Author(s):  
Stephen B Clay ◽  
Philip M Knoth
Keyword(s):  
Air Force ◽  
Research Laboratory ◽  
Experimental Results ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Calibration And Validation ◽  
Computed Tomography Images ◽  
Analysis Methods ◽  
Static Conditions ◽  
Air Force Research Laboratory

The Air Force Research Laboratory directed a research program to evaluate nine different composite progressive damage analysis methods under both quasi-static and fatigue loading. This paper describes the coupon tests that were performed at the Air Force Research Laboratory for calibration and validation of the methods under quasi-static conditions. The basic elastic and failure properties of unidirectional IM7/977-3 graphite/epoxy were first determined in order to properly calibrate the models. Validation tests were then performed on unnotched and open-hole coupons with three different laminate stacking sequences under both tension and compression loading conditions. This paper summarizes these experimental results and provides X-ray computed tomography images at subcritical load levels.

Comparison of composite damage growth tools for fatigue behavior of notched composite laminates

2017 ◽  
Vol 51 (15) ◽  
pp. 2227-2249 ◽  
Author(s):  
SP Engelstad ◽  
SB Clay
Keyword(s):  
Composite Laminates ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Lessons Learned ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Damage Growth ◽  
Composite Damage ◽  
Open Hole ◽  
Air Force Research Laboratory

This paper provides overall comparisons of the fatigue results of an Air Force Research Laboratory exploration into the state of the art of existing technology in composite progressive damage analysis. This program performed blind and recalibration benchmarking exercises for nine different composite progressive damage analysis codes using unnotched and open-hole composite coupons under both static and fatigue loading. This paper summarizes the results of the fatigue portion of this program in which seven of the codes were evaluated. Comparisons are made herein for all seven participants’ predictions with the test data. Overall percent error data are presented, as well as a long list of observations and lessons learned during this year-long effort.

AFSIM’s pseudo-realtime hybrid simulation software design

2021 ◽  
pp. 154851292098526
Author(s):  
J Scott Thompson ◽  
Douglas D Hodson
Keyword(s):  
Air Force ◽  
Discrete Time ◽  
Software Design ◽  
Research Laboratory ◽  
Discrete Event ◽  
Hybrid Simulation ◽  
Simulation Software ◽  
Human Interaction ◽  
Virtual Simulation ◽  
Air Force Research Laboratory

Simulation approaches generally fall into two categories: discrete time or discrete event. For military modeling and simulation needs, the two approaches typically align with virtual simulation, which implies human interaction with the simulation program, and constructive simulation, which implies no human interaction. The Air Force Research Laboratory develops and distributes AFSIM (Advanced Framework for Simulation, Integration, and Modeling) to a user community that uses both virtual and constructive simulation. This paper documents the software design and primary algorithms that provide AFSIM’s support for both modes, which is termed a hybrid simulation.

scholarly journals Air Force Research Laboratory Integrated Omics Research

2015 ◽  
Vol 180 (10S) ◽  
pp. 67-75 ◽  
Author(s):  
Nicholas J. DelRaso ◽  
Victor T. Chan ◽  
Camilla A. Mauzy ◽  
Pavel A. Shiyanov
Keyword(s):  
Air Force ◽  
Research Laboratory ◽  
Integrated Omics ◽  
Air Force Research Laboratory
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