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Interlaminar Mode I and Mode II Fracture Toughnesses in Ceramic Matrix Composites (CMCs)

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-13-C-0346
Agency Tracking Number: N13A-008-0258
Amount: $79,950.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: N13A-T008
Solicitation Number: 2013.A
Solicitation Year: 2013
Award Year: 2013
Award Start Date (Proposal Award Date): 2013-08-15
Award End Date (Contract End Date): 2014-03-15
Small Business Information
40 Wall Street 18th Floor
New York, NY -
United States
DUNS: 061226106
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Marcus Rutner
 Sr Research Engineer
 (212) 367-2951
Business Contact
 Susan Bezanson
Title: Contracts Manager
Phone: (202) 649-2444
Research Institution
 Southern Research Institute
 Terry Barnett
2000 Ninth Avenue South
Birmingham, AL 35205-
United States

 (205) 581-2378
 Domestic Nonprofit Research Organization

Susceptibility to delamination is one of the major weaknesses of ceramic matrix composites (CMCs). Knowledge of the resistance of composite to interlaminar fracture is essential for life cycle prediction analyses of structural components. The current test method for Mode I-interlaminar fracture toughness, the double cantilevered beam (DCB), is not satisfactory for thin CMC specimens because the compliance of the cantilever arms yields a spurious energy release rate. For Mode II-interlaminar fracture toughness testing, the end notched flexure (ENF) test is the most popular, but this test is not a standardized test method as yet. CMC components are in heavy demand for parts subjected to high heat. However, elevated temperature creates more severe conditions for interlaminar fracture toughness testing. A need exists, therefore, for reliable Mode I- and Mode II-interlaminar fracture toughness test methods which are applicable to a wide range of CMC materials, allowing for quantification of Mode I and Mode II-fracture toughness and accounting for the effects due to complexity of ply architecture at room temperature and elevated temperature up to 1316C (2400F). We propose several alternative methods, and a means to evaluate them using finite element analysis and actual testing. We will refine and downselect the methods to standardize an efficient, accurate testing approach.

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

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