Comparison of coating damage in scratch test
is rather difficult because of the different properties of the coating-substrate system tested.
Different criteria may be used to probe the failure point in the scratch test
. The point of failure may be defined as the onset of microcracking, crazing, fish-scale formation, ploughing, or the point at which the coating is penetrated, revealing the underlying substrate .
Nine PP systems were synthesized to investigate the coupling effect of elastic modulus and yield strength on the scratch behavior of PP using an integrated approach of scratch test
and finite element simulation.
There was a significant change in back scratch test
between the pre-test and the post-test on strength assessment day in both CycSG and SSG (p=0.002 and p=0.009, respectively).
As we know the control group maintained their normal lifestyles during the intervention period; however, within-group analysis showed that the control group had significant differences in assessment tests such as Spiral Drawing Test, Moberg Pickup Test, Arm Curl-Up Test, Back Scratch Test
, Chair Stand Test, and Time Up and Go Test between baseline and after 7 weeks (Table 2).
Later investigators expanded upon the scratch test
to include not only more sophisticated instrumentation for controlling the load program of the stylus and advanced microscopy for observing the scratch track but also coupling of the scratch method with acoustic spectroscopy whereby the sound vibrations generated by the stylus are detected and recorded at the same time that the scratch track Is being formed.
was performed with a scratch-tester (CSM Instruments, Switzerland) which was equipped with Rockwell HRC penetrator with the tip of 120[degrees] cone angle and 100-[micro]m radius.
In addition, the experimental data confirmed how the coatings became progressively stiffer (i.e., progressively higher percentage of plastic contribution) and more brittle (i.e., progressively higher percentage of fracture contribution) when higher sliding speed was set during the constant load scratch test
The inferior Apley's scratch test
improved somewhat from the 20 cm pre-treatment discrepancy to a 14 cm post-treatment discrepancy.
Paruchuru, X.Wang, 3D Finite Element Simulation of a Novel Scratch Test
for Assessing the Bone Quality, in Proceedings of BioMedical Engineering Society Annual Fall Meeting, Chicago, Illinois, USA.
To investigate the boundary strength of the printed paperboard, two pattern paperboards were prepared for the scratch test
. One was conventional coated paperboard of 230 g/[m.sup.2] nominal basis weight and 0.3 mm thickness.
RockTron notes that in scratch test
plaques where a PP copolymer containing 15% talc was compared with an identical copolymer with 15% MinTron replacing the talc, "in addition to the vastly improved scratch resistance of the MinTron-filled plaque compared with the talc, a 50% reduction in emissions was measured." Further, the company says, the 20% lower density of MinTron compared with talc means that "if MinTron is substituted on an equal volume basis, then lower-weight components can be produced."