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Presentation
Automated Construction of Layer-by Layer Finite Element Sub-Models of Damaged Composites Based on NDE Data
Proceedings of the American Society for Composites: Thirty-second Technical Conference
  • Stephen D. Holland, Iowa State University
  • Adarsh Krishnamurthy, Iowa State University
  • Onur Bingol, Iowa State University
  • Robert Grandin, Iowa State University
Document Type
Article
Conference
American Society for Composites: Thirty-second Technical Conference
Publication Version
Published Version
Publication Date
1-1-2017
DOI
10.12783/asc2017/15216
Conference Title
American Society for Composites: Thirty-second Technical Conference
Conference Date
October 23-25, 2017
Geolocation
(40.4258686, -86.90806550000002)
Abstract

Composite laminate structures are usually modeled as a shell in finite element analysis tools for strength and stiffness determination. However, modeling for fatigue or degradation analysis often needs to be performed with layer-by-layer solid models, but building these models for nontrivial geometries can be extremely difficult, especially when trying to represent realistic defects. This paper discusses how the process of generating layer-by-layer solid finite element models, including insertion of defects, can be automated. We have developed a tool, Delamo, to automate the construction of such models. The tool provides an interface to a commercial solid modeling kernel (ACIS) and a commercial finite element analysis package (ABAQUS). It allows the solid model and finite element model to be built in parallel, layer by layer, starting with a mold, following the same assembly steps as the physical laminate. The bonding step determines the boundary conditions to be applied in the finite element model. Delaminations, determined from nondestructive evaluation (NDE) data can be inserted between layers as needed and are represented as unbonded regions. Potential delamination growth regions can be modeled with a cohesive layer or cohesive boundary condition. Fiber breakage in a layer will be represented by an internal boundary. Based on a mold and a sequence of layer construction and bonding instructions, the tool generates both a solid model and a Python script for ABAQUS that will generate a complete finite element model based on that solid model.

Comments

This proceeding appeared in Holland, Stephen D., Adarsh Krishnamurthy, Onur Bingol, and Robert Grandin. "Automated Construction of Layer-by-Layer Finite Element Sub-Models of Damaged Composites Based on NDE Data." In Proceedings of the American Society for Composites—Thirty-second Technical Conference (2017). Lancaster, PA: DEStech Publications, Inc. DOI: 10.12783/asc2017/15216. Posted with permission.

Copyright Owner
American Society for Composites
Language
en
File Format
application/pdf
Citation Information
Stephen D. Holland, Adarsh Krishnamurthy, Onur Bingol and Robert Grandin. "Automated Construction of Layer-by Layer Finite Element Sub-Models of Damaged Composites Based on NDE Data" West Lafayette, INProceedings of the American Society for Composites: Thirty-second Technical Conference (2017)
Available at: http://works.bepress.com/robert_grandin/24/