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Piezomagnetism and fatigue: II

机译:压电和疲劳:II

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摘要

The cumulation of damage in test specimens of AISI 1018 steel, subjected to repeated cycles of tension and compression leading to fatigue failure at N-f cycles, is correlated with the evolution of stress-strain (sigma - epsilon) hysteresis and piezomagnetic (B-epsilon) hysteresis. Specifically, the sigma - epsilon hysteresis loop areas, when plotted as a function of the number of loading cycles N, show systematic variations that can be identified with the three principal stages of fatigue: initial accommodation (i.e. strain softening or hardening), N < N-2; accretion of damage, N-2 < N < N-3, and terminal failure (crack coalescence and growth); N-3 < N < N-f. Data from 49 fatigue trials, spanning the range 1219 <= N-f <= 250 200, show that the transitional cycles N2 and N3 have an approximately invariant relation to final fatigue failure at Nf : i.e. N-2/N-f approximate to 12% and N-3/N-f approximate to 90%. Piezomagnetic hysteresis develops in parallel with stress-strain hysteresis and also exhibits transitions at N-2PM and N-3PM corresponding to N-2 and N-3. Detailed analyses of eight fatigue trials yield the approximately invariant ratios N-2PM/N-f approximate to 12% and N-3PM/N-f approximate to 93% where 3561 <= N-f <= 189 629.
机译:AISI 1018钢试样中的损伤累积经历反复的拉伸和压缩循环,导致Nf循环疲劳失效,这与应力应变(sigma-ε)滞后性和压电(B-epsilon)的演变有关磁滞现象。具体来说,当将sigma-ε磁滞回线面积作为载荷循环次数N的函数进行绘制时,会显示出系统性变化,可以通过疲劳的三个主要阶段进行识别:初始变形(即应变软化或硬化),N < N-2;损坏的累积,N-2

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