The
microcracking initiated from the surface pitting, and virtual stress increased with the progress of pitting corrosion.
The combination of tension and shear
microcracking together with sliding in biotite basal planes was found to control the failure of specimens with sub-horizontal foliation.
Figure 8 shows the existence of surface polishing,
microcracking, and detachment of wear particle.
It has been recognized that immediately ahead of a moving crack is a zone of
microcracking called the process zone.
Damage mechanics simulate in equivalent continuous media, the deterioration of materials exclusively owing the
microcracking process.
These composites have to be thicker and heavier to compensate for the
microcracking. Nanofillers can prevent
microcracking and, hence, toughen composites.
The brim and diagonal of indentation are very clear, and little
microcracking is found around the indentation.
Future revisions likely will address
microcracking brought on by Pb-free materials and processing that makes boards more brittle.--MB