Mode I and Mode II Interlaminar Crack Growth Resistances of Ceramic Matrix Composites at Ambient Temperature

Abstract

Interlaminar crack growth resistances were determined for five different SiC fiber-reinforced ceramic matrix composites (CMCs) including three gas-turbine grade melt-infiltrated SiC/SiC composites. Modes I and II crack growth resistances, GI and GII, were evaluated at ambient temperature using double cantilever beam and end notched flexure methods, respectively. The CMCs exhibited GI =200-500 J/m2 and GII=200-900 J/m2. Most of the CMCs, except the SiC/CAS composite, showed rising R-curve behavior either in Mode I or in Mode II, presumably attributed to fiber bridging (in Modes I and II) and frictional constraint (in Mode II) in the wake region of a propagating crack. A glass fiber-reinforced epoxy polymer matrix composite, used as comparison, showed R-curve behavior and typically 2-3 and 8 times greater in GI and GII, respectively, than the CMCs. Experimental error analysis concerning the effect of the off-the-center of a crack plane on GI and GII was also made.

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Document Details

Document Type
Technical Report
Publication Date
Mar 02, 2007
Accession Number
ADA464376

Entities

People

  • Donald J. Alexander
  • Robert W. Kowalik
  • Sung R. Choi

Organizations

  • Naval Air Warfare Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Cantilever Beams
  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Error Analysis
  • Gas Turbines
  • Glass Fibers
  • Materials
  • Materials Processing
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Polymer Matrix Composites
  • Resistance
  • Silicon Carbide
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials