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Mechanism Based Damage Model for Linerless Thin-Ply Composite Pressure Vessels

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX17CL79P
Agency Tracking Number: 170190
Amount: $124,510.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: T12.03
Solicitation Number: N/A
Solicitation Year: 2017
Award Year: 2017
Award Start Date (Proposal Award Date): 2017-06-09
Award End Date (Contract End Date): 2018-06-08
Small Business Information
300 East Swedesford Road
Wayne, PA 19087-1858
United States
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Daniel Hladio
 Principal Investigator
 (610) 964-9000
Business Contact
 Kerry Howern
Title: Program Manager
Phone: (610) 964-9000
Research Institution
 University of Dayton Research Institute
 Claudette Groeber
300 College Park
Dayton, OH 45469-0101
United States

 (937) 229-2919
 Nonprofit College or University

Thin-ply composites are being considered by NASA for space exploration applications, where the suppression of microcracks could give rise to linerless cryogenic tanks. In this proposed Phase I STTR effort, material testing coupled with health monitoring techniques will be used to quantify damage accumulation within composite materials, both standard ply thickness and of the thin-ply design. A multi-scale physics based approach, verified with empirical data, will be used to develop a design tool capable of predicting the useable life of a composite structure subjected to cyclic loads.

A fracture mechanics based model in a multi-scale framework is proposed as a design tool for modeling thin-ply laminates. The key variable of the model, the microcracking critical energy release rate (CERR), is to be calibrated to quasi-static and fatigue testing. Acoustic emission (AE) monitoring will be used to quantify the crack density as a function of load history. The model will be interrogated with CERRs to best match the crack density as a function of load observed during the experiments. If the CERR is indeed a material property, the same value should exist regardless of ply thickness and fiber architecture. The design tool will include a stand-alone program to perform this calibration of the CERR for cross-ply laminates. Additionally, a User Material (UMAT) will be written to link the microcracking model to a structural level model in a commercial finite element code.

* Information listed above is at the time of submission. *

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