The effect of test conditions on the work of fracture of Thiokol-based sealants containing different dispersed fillers is studied.Carbon black,titanium dioxide,and hydrophobized natural chalk are used as fillers.The influence of an increase in a single defect is estimated to predict the long-term adhesive strength between the Thiokol-based sealants and different materials.The mechanism and the scale of variations in the fracture strength of sealants in the peel regime are considered.The efficiency of the testing procedure for samples with a central defect is shown.Methods to enhance the fracture strength of Thiokol-based sealants under the conditions of combined stress are discussed.
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