According to the certificate, the opening of crack no. 1 on the
TsM 33-97 specimen is 2
μ
m while the actual value is 4.6
μ
m. For a number of specimens that are identical
according to their certificates (the crack-opening displacements range from 1 to 2
μ
m), the measured openings
correspond to this range, but the measured dimensions of cracks differ significantly