HVTEMHigh-Voltage Transmission Electron Microscope
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At the same time, application of (7) for determining the J-integral and using the experimental data obtained in the HVTEM does not eliminate all of the characteristic problems for the following reasons.
(b) Microcracks initiated in specimens during a tensile test inside an HVTEM are developed because the three crack modes are combined, but (7) considers that the test on a specimen is carried out only by a normal breakaway.
We developed an approach to define the J-integral from the data obtained experimentally during tensile tests applied to microspecimens in a standard grip system inside the column of an HVTEM. Our approach considers the contribution of the all three crack modes in a single magnitude of the J-integral: J = [G.sub.I] + [G.sub.II] + [G.sub.III]; according to [8], the velocity of the deformation energy release during the crack development process can be expressed as in