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一、引言设10~(-μ)是一个很小的正数,把对应于da/dN=10~(-μ) (1)的△k定义为应力强度因子幅度门槛值,记为△K_(th)。当疲劳裂纹扩展速率da/dN的单位为毫米/周(mm/cycle)时,一般把(1)式中的μ取为7。由于用实验方法测定△K_(th)要花费较多的人力物力
I. INTRODUCTION Assuming that 10 ~ (-μ) is a small positive number, Δk corresponding to da / dN = 10 ~ (-μ) (1) is defined as the magnitude threshold of stress intensity factor, denoted as ΔK_ (th). When the fatigue crack growth rate da / dN is expressed in millimeters / cycle, μ in (1) is generally taken as 7. As the experimental method to determine △ K_ (th) to spend more manpower and resources