1.1 This test method covers the determination of transthickness tensile strength of continuous fiber-reinforced ceramic composites (CFCC) at elevated temperatures using a compression wedge-loaded double V-notch specimen geometry to produce tensile forces normal to the laminate layers of the composite. This test method addresses recommended test specimen geometries, test fixtures and equipment, test methods, data collection and reporting procedures. Interlaminar tensile strength is another term for the transthickness tensile strength. 1.2 The test specimen geometry is a small, thin, rectangular section of ceramic composite stock, in which opposing V-notches with root notches are machined into the top and bottom interlaminar edges of the specimen (See Figure 1). The test fixturing consists of two high temperature wedge shaped loading anvils, where the wedge geometry precisely fits into the specimen V-notches. Compression loading of the loading anvils and the tensile specimen produces tensile forces normal to the thickness of the specimen across the interlaminar plane. 1.3 This test method is specifically designed for testing of ceramic composites at elevated temperatures (200C), where the epoxy adhesive (used in the flat-wise tensile testing at ambient temperature per ASTM C 1468) typically fails. This test method uses a compression wedge loading system to impose tensile forces across the flat plane of the specimen, and does not require the adhesive bonding of the test specimen to the loading fixtures.
This compression wedge loading test method for transthickness tensile strength is specifically developed for high temperature (300C) ceramic composite testing, because it does not require the epoxy adhesive bonding used in the flat-wise transthickness tensile test (ASTM C 1468), which is a temperature limitation on that test.
ceramic matrix composite; continuous ceramic fiber composite; transthickness tensile strength; interlaminar tensile strength; wedge compression; high temperature
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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