研究了含氢量为110 μg/g和 280 μg/g的Ti-4Al-2V钛合金在不同载荷比下的疲劳裂纹扩展行为.载荷比降低,da/dN曲线向高ΔK方向移动,并逐渐不出现疲劳裂纹的近门槛扩展阶段;无论载荷比和含氢量的高低,稳态裂纹扩展区的裂纹扩展行为符合Paris幂律关系,即da/dN=C(ΔK)m;含氢量为110 μg/g时,载荷比对稳态裂纹扩展区的da/dN没有影响;含氢280 μg/g时,载荷比降低,稳态裂纹扩展区的da/dN也降低;载荷比影响裂纹由近门槛扩展区进入稳态裂纹扩展区的应力强度因子范围ΔKp和开始失稳扩展的应力强度因子范围ΔKⅠH.载荷比越小,ΔKp和ΔKⅠH越大.
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