Σtch Yield conventional methods is determined by loading and un-loading a row (Figure 5), after placing a chuck: Tonic for stressed samples σ0 not exceed 10% σhch liquid limit (determined equal to ten-some- meters), then load the sample until σz = 2. Keep force from 5 seconds to 7 seconds, and lowered stress load until σ0. Starting from the corresponding stress values 70-80% of the sample σhch next load.
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