Abstract
We have studied the stress-strain state of material in the process zone, near the crack tip in cruciform specimens made of 09G2S steel under non-proportional biaxial loading. We have obtained the strain distribution in this zone, in a domain of size 6 × 4.5 mm by the method of digital correlation of speckle images. We have compared the strain distributions and critical parameters obtained in air and hydrogen. It has been established that, under biaxial loading, the critical stress intensity factor K C , critical crack opening δ C , and critical strain e C near its tip vary within the limits of 15, 47, and 40%, respectively, depending on the parameter of loading rigidity κ. For hydrogen, we have detected a shift of the maximum of the dependence P C vs. parameter κ to the side of its positive values. The maximal effect of hydrogen on δ C and eС is observed under uniaxial tension (κ = 0).
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