3.3 Prepara
Prepara
z
In the
process
z
Too big
to be m
z
Suppor
set on t
wobble
z
Curved
surface
smaller
should
z
The sam
3.
z
For the
Table 3
z
Coupli
surface
directio
bendin
big en
reinfor
z
Magne
ation of the
ation for sam
preparation
sing on the
g roughness
measured mu
rt of test sam
the smoothi
e.
d surface: T
e to be teste
r than 50mm
be chosen.
mple should
e sample w
3.
ng. Light-w
e must be f
on must be
ng piece, it c
nough, and
rced or supp
etism of the
Sample Sur
mple surfac
n processin
surface of s
s of the bein
ust appear m
mple. Supp
ing and stab
The best tes
ed is smalle
m (G type o
d have enou
with hardene
weight samp
flat and smo
e vertical to
can be defo
accordingly
ported at its
sample itse
rface
ce should co
ng for samp
sample shou
ng measure
metallic lust
port is no ne
ble plane. T
sting surfac
r than 30mm
of impact d
ugh thicknes
ed layer on
ple must be
ooth, and th
o the couple
ormed and b
y, the test
back.
elf should be
onform to th
ple surface,
uld be avoid
ed surface c
ter, smoothi
ecessary for
The sample
ce of sampl
m (D, DC,
device), the
ss, minimum
n surface, th
e firmly co
here is no r
ed surface.
become uns
value may
e avoided.
he relative r
, the hardn
ded.
could cause
ing and poli
r heavy sam
must set ab
le is flat. W
D+15,C, E
small supp
m thickness
he depth of
oupled with
redundant c
When the
stable, even
y not be a
requirement
ess effect o
error. So, t
ish, without
mple. Mediu
bsolutely eq
When the cu
and DL typ
ort ring or
s of sample
f hardened l
h a heavy b
coupling age
sample is
n though its
accurate. So
t in Append
of being he
the surface o
t oil stain.
um-weight p
quability and
urvature rad
pe of impac
the shaped
should conf
layer shoul
base plate. B
ent existing
a big plate
s weight and
o the samp
ix Table 3.
eated or co
of the samp
parts must
d without an
dius R of t
ct device) an
support rin
form to Tab
d conform
Both coupl
g. The impa
e, long rod
d thickness
ple should
old
ple
be
ny
the
nd
ngs
ble
to
led
act
or
is
be
