Damage methods tensile properties

The impact of thermal shock on the properties of a ceramic or a CMC is assessed by means of both destructive and non-destructive testing methods. Flexural or tensile (mainly for CMCs) tests of suitably-sized thermally shocked specimens are usually employed to measure retained mechanical properties as a function of the temperature difference. The temperature differential for which a significant drop in property values is observed is the A A- For monolithic ceramics and particle- or whisker-reinforced CMCs the property under investigation is usually strength, whereas in fibre-reinforced CMCs a drop in Young s modulus is usually a better indication of the onset of damage. 

Two methods are used for determining the fabric-damaging properties of bleach systems tensile strength loss, on a macroscopic level, and the decrease in the degree of polymerization, on a microscopic level. Recently it was shown that there is only poor correlation between the resnlts of both test methods. To obtain reliable data, measnranent of tensile strength loss after 20 or 50 wash... 

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