High-Temperature Interlaminar Tension Test Method Development for Ceramic Matrix Composites

2011 ◽  
pp. 11-21 ◽  
Author(s):  
Todd Z. Engel ◽  
Wayne S. Steffier ◽  
Tony Magaldi
Keyword(s):  
High Temperature ◽  
Method Development ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Tension Test ◽  
Test Method ◽  
Matrix Composites ◽  
Test Method Development

High-Temperature Interlaminar Tension Test Method Development for Ceramic Matrix Composites

2013 ◽  
Author(s):  
Todd Engel
Keyword(s):  
High Temperature ◽  
Method Development ◽  
Standardized Test ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Test Method ◽  
Test Technique ◽  
Structural Applications

Ceramic Matrix Composite (CMC) materials are an attractive design option for various high-temperature structural applications. In particular, the use of CMC materials as a replacement for state-of-the-art nickel-based superalloys in hot gas path turbomachinery components offers the potential for significant increases in turbine system efficiencies, due largely to reductions in cooling requirements afforded by the increased temperature capabilities inherent to the ceramic material. However, two-dimensional fabric-laminated CMCs typically exhibit low tensile strengths in the thru-thickness (interlaminar) direction, and interply delamination is a concern for some targeted applications. Currently, standardized test methods only address the characterization of interlaminar tensile strengths at ambient temperatures; this is problematic given that nearly all CMCs are slated for service in high-temperature operating environments. This work addresses the development of a new test technique for the high-temperature measurement of interlaminar tensile properties in CMCs, allowing for the characterization of material properties under conditions more analogous to anticipated service environments in order to yield more robust component designs.

Development of ASTM Test Standards for the Mode I Interlaminar Fracture Toughness (GIc--Crack Growth Resistance) of Ceramic Matrix Composites

2018 ◽  
Author(s):  
Frank Abdi ◽  
Jalees Ahmad ◽  
Saber DorMohammadi ◽  
Cody Godines ◽  
Stephen Gonczy ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Crack Growth ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Crack Growth Resistance ◽  
Test Method ◽  
Mode I ◽  
Matrix Composites ◽  
Interlaminar Fracture

Ceramic matrix composite (CMC) materials are targeted for high temperature application in aircraft and power turbines, because of their low density and high-temperature thermo-mechanical properties, compared to conventional nickel super alloys. New test methods are needed for the assessment of the effects of delamination cracks on the structural integrity and life of CMC components. The ASTM C28 Fracture Toughness (Crack Growth Resistance – CGR) Working Group has drafted a standard test method for the “Mode I Interlaminar Fracture Tougness (GIc – Crack Growth Resistance) of Fiber-Reinforced Ceramic Matrix Composites (CMC) by Wedge Loading of a Double Cantilever Beam at Ambient Temperatures” The wedge loading method was developed to avoid the problems of high temperature bonding of loading blocks and hinges. The ASTM test standard details the scope, use, and application of the test method, interferences, test equipment, specimen geometry and preparation, test procedures, data interpretation and calculation, and reporting requirements for the new CMC CGR test method.

Development of an Interlaminar Toughness Test for Ceramic Matrix Composites

2015 ◽  
Author(s):  
Rabih Mansour ◽  
Emmanuel Maillet ◽  
Gregory N. Morscher
Keyword(s):  
High Temperature ◽  
Crack Length ◽  
Crack Growth ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Test Method ◽  
Optical Measurements ◽  
Matrix Composites ◽  
Interlaminar Fracture ◽  
Area Of Interest

Interlaminar fracture properties in fiber-reinforced ceramic matrix composites have been found to be a limiting feature in certain applications, a limitation that intensifies at elevated temperatures. Few if any fibers bridge the cracks in the interlaminar direction, resulting in a weaker toughness and a higher probability of failure in this direction. The main challenge in evaluating interlaminar fracture toughness is the difficulty to detect the crack initiation and to measure the crack length directly at high temperature, primarily because of the limited visual accessibility of the area of interest. A DCB test-method using a ceramic wedge is developed. The method uses electrical resistance to monitor crack growth for melt-infiltrated woven SiC/SiC composites at room temperature, with the goal of doing the same at high temperature. In situ optical measurements of crack growth in addition to micro-CT post-inspection were used to validate and calibrate the resistance method. The estimated crack length was in excellent agreement with the measured crack length in the three considered specimen geometries. Preliminary estimates of Mode I energy release rate were also provided.

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