Restricted Research - Award List, Note/Discussion Page

Fiscal Year: 2018

1974  The University of Texas at Arlington  (75792)

Principal Investigator: Endel Iarve

Total Amount of Contract, Award, or Gift (Annual before 2011): $ 988,000

Exceeds $250,000 (Is it flagged?): Yes

Start and End Dates: 1/23/18 - 1/17/20

Restricted Research: YES

Academic Discipline: UT Arlington Research Institute

Department, Center, School, or Institute: Office of the Vice President for Research

Title of Contract, Award, or Gift: Advanced Material Characterization & Structural Certification

Name of Granting or Contracting Agency/Entity: Wichita State University

Program Title: N/A
CFDA Linked: Air Force Defense Research Sciences Program


1.1.1 Verification and Validation of Discrete Damage Modeling (Task 1). The proposed discrete damage modeling (DDM) technology is based on Regularized Extended Finite Element Methodology (Rx- FEM), Ref. [1], which is currently implemented in the BSAM software developed with the sponsorship of Air Force Research Laboratory (AFRL) including the framework required for geometrically nonlinear analysis.  Verification and validation (V&V) exercises were performed on various failure modes and laminate configurations including static and fatigue loading. While the static framework showed a significant degree of maturity, the fatigue methods will be further V&V and extended to analysis in geometrically nonlinear regimes and spectrum fatigue loading. The fatigue simulation within DDM framework and Rx-FEM formulation has been demonstrated and validated on open hole tension-tension examples in Ref. [2]. While the kinematic Rx-FEM framework requires no modification the constitutive relationships allowing for fatigue crack insertion and propagation criteria were developed. All of the analysis was performed under constant amplitude loading. This research effort proposes analytical and experimental development to extend and execute verification and validation (V&V) of the methodologies under spectrum loading fatigue and block loading sequences in particular.   The analytical development will modify current combination of the Event and Cycle based modeling approach towards cycle based approach allowing to predict the material changes under relatively small and a priory defined number of cycles and take into account load sequencing effects. However, the effect of load sequencing on behavior of matrix and fiber dominated modes is not fully understood. The input parameters and material characterization guidelines required for such modeling will be addressed at the University of Texas Arlington (UTA) ........

Discussion: No discussion notes


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