Description / Abstract:
This SAE Recommended Practice covers a procedure for evaluating
plastic and multiple-layer coatings exposed to gravelometer testing
(as defined in SAE J400) with an optical imaging and analysis
system. The intent of the procedure is to detect, count and
characterize instances of damage in the coated surface that
fracture the top coat layer or penetrate through multiple layers of
the coating system. It may be possible to extend this methodology
of coating damage evaluation to specimens that have undergone test
procedures or exposures that produce similar, discrete damage sites
in the coating system. If so applied, evaluation results must be
interpreted with respect to the limitations and intent implied by
the original evaluation procedure and its associated rating system,
if applicable.
Applicability
This method may be applied to the evaluation of surface damage
on plastic and coated surfaces caused by means other than
gravelometer testing; provided that the specimen substrate is not
significantly deformed to a degree that would prevent all surface
damage sites from remaining in a single focal plane capable of
being adequately resolved by the image capturing device.
Application
This SAE Recommended Practice covers a procedure for evaluating
plastic and multiple-layer coatings exposed to gravelometer testing
(as defined in SAE J400) with an optical imaging and analysis
system. The intent of the procedure is to detect, count and
characterize instances of damage in the coated surface that
fracture the top coat layer or penetrate through multiple layers of
the coating system. It may be possible to extend this methodology
of coating damage evaluation to specimens that have undergone test
procedures or exposures that produce similar, discrete damage sites
in the coating system. If so applied, evaluation results must be
interpreted with respect to the limitations and intent implied by
the original evaluation procedure and its associated rating system,
if applicable.