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MATERIALS TEST SPECIMENS AND INSTRUMENTATION
LOADING AND REGISTRATION EQUIPMENT
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1,0 Cycle ratio calculated variation characteristic stress level compressive strength constant amplitude loading constant amplitude tests corresponding cumulative frequency Cycle ratio N/Nf cycles to failure cyclic loading emax fatigue failure fatigue strength fatigue tests given in table illustrated in fig increase indicated in fig interval estimation load cycles loading histogram Loading Model log normal maximum stress level mean stress level Measured and calculated Measured variation metal fatigue Miner-sum modulus of elasticity N/Np number of cycles o/oo omission of small parameters peaks Percentage reduction PM hypothesis predicted present tests pulse velocity ratio N/Nf Fig Rayleigh distribution S-N curve S-N-P relationship secant modulus sequence effects small amplitudes Smax stage constant amplitude standard deviation static strength static tests strain gauge Stress-Strain Characteristics Stress-strain curve test specimen total longitudinal strain total maximum strain unmodified histogram variable amplitude loading variable loading variation of total ZZ'Z