3D internal crack propagation in brittle solids under non-uniform
temperature field: Experimental and numerical simulation
Abstract
:Thermal fracture is a common problem in engineering. Traditional
studies mainly addressed surface crack propagation, with limited
research on 3D internal crack propagation. This paper uses the 3D-ILC
method to fabricate 3D internal cracks of different positions within
semi-disc specimens. Physical experiments, numerical simulations and
fracture morphology analysis were conducted on the propagation of 3D
internal cracks under non-uniform temperature fields. The results
indicate the following: 1) In physical experiment, different crack
propagation modes were observed in group A at different heights,
including “n-shaped” and “u-shaped” cracks, while group B formed the
“s-shaped” cracks. 2) In numerical simulation, the crack propagation
length and deflection angle for crack tips on both sides are different
of the same specimen in group B. The K Ⅲ of the internal
cracks in group B cannot be overlooked, consistent with the location of
the “lance-like” fracture observed in the physical experiments. 3) In
fracture morphology, group A cracks have smooth fracture surfaces, which
are mode I-II mixed cracks, while group B cracks show lance-like
fracture, considered mode I-II-Ⅲ mixed cracks. The results provide an
experimental and theoretical basis for the study of 3D internal crack
propagation patterns under non-uniform temperature fields.