SEDL / STP / STP1309-EB / STP11813S

Unloading-Reloading Sequences and the Analysis of Mechanical Test Results for Continuous Fiber Ceramic Composites

Steen, M
Research Officers, Institute for Advanced Materials, Joint Research Centre, European Commission, ZG Petten,

Vallés, JL
Research Officers, Institute for Advanced Materials, Joint Research Centre, European Commission, ZG Petten,

Pages: 17    Published: Jan 1997

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Abstract

The introduction of intermittent unloading — reloading cycles during mechanical testing is an extremely powerful tool to assist in the interpretation of the mechanical response of a material to the imposed loading conditions. This technique has a potential as a probing method in material characterization which has been vastly underestimated, particularly in the case of continuous-fiber ceramic composites (CFCCs), where, in addition to helping in the description of damage development, it can yield important information on fiber-matrix interfacial phenomena as well. The present contribution highlights the results obtained from the incorporation of unloading-reloading cycles during uniaxial strength, creep and fatigue tests on selected 2D woven CFCCs at room and elevated temperatures. Some implications for the modeling of the mechanical behavior are indicated.