利用压痕裂纹恒载荷试样,研究了单晶硅在空气中应力腐蚀以及动态充氢时氢致滞后开裂的可能性;利用卸载的压痕裂纹试样研究了残余应力引起氢致滞后开裂的可能性.结果表明,单晶硅压痕裂纹恒载荷试样当KI=KIC时在空气中并不发生应力腐蚀.在H2SO4溶液中动态充氢,则能发生氢致滞后开裂,止裂时归一化门槛应力强度因子为KIH/KIC≈0.9.卸载压痕裂纹的残余应力在充氢过程中也能引起氢致滞后开裂,归一化门槛应力强度因子为KIH/KIC≈0.9.
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