IPC-TM-650 EN 2022 试验方法--.pdf - 第209页
Note: IPC-TM-650 Note: Note: Note: Figure 1 Smooth and rough foil t M t t = t M The Institute for Int erconnecting and Packaging E lectronic Circuits 2215 S anders Road • Northbrook, IL 60062-6135 Material in this T est …
IPC-TM-650
Number
Subject Date
Revision
Page 3 of 3
2.4.2.1
Flexural
Fatigue
and
Ductility,
Foil
3/91
D
5.3.4
The
flexural
fatigue
life
at
bend
radii
other
than
man¬
drel
radius
can
also
be
obtained
by
evaluating
the
ductility
for¬
mula
for
the
flex
life
in
cycles-to-failure
using
the
fatigue
duc¬
tility
determined
in
5.3.1
.2
and
the
desired
bend
radius.
6.0
Notes
For
further
technical
details,
reference
the
mate¬
rial
shown
below.
6.1
Document
in
paragraph
2.0
(IPC-TP-204).
6.2
Engelmaier,
W.,
"Fatigue
Ductility
for
Foils
and
Flexible
Printed
Wiring,”
Program
No.
1883D
HP-67/97
User's
Library,
Hewlett
Packard
Co.,
Corvallis,
Oregon,
1978.
6.3
Engelmaier,
W.,
“Fatigue
Ductility
Flex
Tester,”
Drawing
L520163,
Bell
Telephone
Laboratories,
Inc.,
Whippany,
New
Jersey,
1978.
6.4
Test
Equipment
Sources
The
equipment
sources
described
below
represent
those
currently
known
to
the
industry.
Users
of
this
test
method
are
urged
to
submit
addi¬
tional
source
names
as
they
become
available,
so
that
this
list
can
be
kept
as
current
as
possible.
6.4.1
Fatigue
Ductility
Flex
Tester,
Universal
Tool
&
Machine
Inc.,
171
Coit
St.,
Irvington,
NJ
07111;
201-374-4400.
6.4.2
JDC
Precision
Sample
Cutter,
Model
J
DC
125-N
or
equal.
Note:
IPC-TM-650
Note:
Note:
Note:
Figure 1 Smooth and rough foil
t
M
t
t = t
M
The Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.
Page 1 of 3
IPC-TM-650
TEST
METHODS
MANUAL
1
.0
Scope
With
this
test
method
the
flexural
fatigue
life
for
any
given
bend
radius,
the
flexural
fatigue
behavior
and
the
ductility
in
percent
deformation
after
tensile
failure
can
be
determined.
The
indirect
determination
of
foil
ductility
by
using
a
fatigue
test
is
made
necessary
by
the
geometry
and
dimen¬
sions
of
foil
samples
which
make
tensile
elongation
and
rup¬
ture
tests
inadequate
for
ductility
determination.
2
.0
Applicable
Documents
Method
2.1.1,
Microsectioning
Method
2.4.18,
Tensile
Strength
and
Elongation,
Copper
Foils
3
.0
Test
Specimen
Foil
of
sufficient
size
to
permit
cutting
of
three
3.2
mm
[1/8
inch]
wide
specimens
of
at
least
50.8
mm
[2
inches]
in
length.
Specimens
must
be
clean
cut
and
free
of
burrs
and
nicks.
4
.0
Apparatus
4.1
Ductility
Flex
Tester,
Universal
Mfg.,
Model
FDF
or
2FDF
or
equal
(see
6.4
and
Figure
2).
4.2
Sample
cutter,
punch
or
tensile
cut
router.
Note
6.4.
4.3
Micrometer
tool
capable
of
measurement
to
the
nearest
0.0025
mm
[0.0001
inch].
4.4
Programmable
Calculator,
Hewlett-Packard
HP-67,
or
equivalent.
4.5
Sample
holders,
203.2
x
12.7
mm
[8
x
1/2
inch],
of
very
flexible
but
durable
material,
e.g.,
epoxy-impregnated
glass
cloth,
paper,
etc.
4.6
Microscope
5
.0
Procedure
Number
2.4.2.
1
Subject
Flexural
Fatigue
and
Ductility,
Foil
Date
Revision
3/91
D
Originating
Task
Group
N/A
5.1.1
The
samples
should
be
smooth
and
undistorted
(wrinkle
free).
5.1.2
Use
the
sample
cutter
to
cut
the
3.2
mm
[1/8
inch]
wide
test
specimen.
Examine
each
specimen
for
nicks,
cuts,
or
curled
edges.
Discard
any
specimen
with
defects.
5.1.3
Use
the
micrometer
to
determine
the
specimen
thick¬
ness,
t,
in
center
of
each
specimen
to
the
nearest
0.0025
mm
[0.0001
inch].
If
one
or
both
specimen
surfaces
are
rough,
it
is
necessary
to
determine
the
core
thickness,
tM
from
a
micro¬
section
(see
Figure
1).
Thickness
is
a
critical
parameter
in
the
determination
of
fatigue
ductility.
A
10%
error
in
tM
results
in
a
14%
error
in
Df.
The
core
thickness,
tM,
is
preferably
determined
as
a
fraction
of
the
specimen
thickness,
t,
from
a
microsection
pre¬
pared
per
IPC-TM-650,
method
2.1.1
and
measured
with
a
metallurgical
microscope
at
200X
minimum
with
a
suitable
filar
eyepiece
or
reticle.
The
measurement
is
to
be
made
from
the
valley
of
the
rough
surface
to
the
smooth
surface,
or
valley
to
valley,
where
both
surfaces
are
rough.
The
tM
is
to
be
made
once
on
a
batch
or
lot
basis,
and
this
fractional
value
of
tM/t
is
then
multiplied
by
all
other
micrometer,
t,
values
to
achieve
core
values
for
all
samples.
Care
must
be
taken
that
during
thickness
measure¬
ments
the
specimens
are
not
compressed
or
surface
rough¬
ness
crushed,
producing
false
low
thickness
readings.
5.1.4
Attach
test
specimen
to
the
ends
of
2
sample
holders
with
adhesive
tape
and
clamp
84
grams
[3
ounce]
foil
weight
(not
the
8
ounce
weight
shown
in
Figure
2)
to
the
free
ends
of
the
sample
holders
to
form
a
loop
(See
Figure
2).
5.1
Preparation
of
Samples
1 Scope
To determine the number of flexes to conductor
failure of etched flexible printed board conductor patterns.
2 Applicable Documents
None
3 Test Specimen
The test specimen consist of an
etched conductor pattern in accordance with Figure 1. A mini-
mum of six specimens with the long dimension of the conduc-
tors oriented in the transverse direction of the base material
be prepared using standard commercial practices.
For double-sided clad constructions, a separate sample
specimen
be prepared for each side. The opposite
(untested) side
be completely etched of copper.
4 Apparatus
Flexural Endurance Tester (see Figure 2) or
equivalent.
5 Procedures
5.1
Examine the etched conductor specimen for any pre-
existing fractures and look for evidence of process anomalies
(such as pin holes and nicks), which could cause premature
fracture. If such fractures or anomalies are found, the speci-
men
be discarded and a new specimen selected.
5.2
Attach (solder, clamp, etc.) a short length of insulated
wire to the extreme ends of the conductor pattern of each of
the six specimens.
5.3
Using the flexure test equipment as seen in Figure 2,
mount the specimen so that the inside diameter of the loop is
6 mm ± 1 mm [approximately, 0.25 in ± 0.04 in] and connect
the two wires to the relay. The horizontal oscillation of the
reciprocating bar causes the flexible test specimen to move in
what can be described as a rolling, flexible action.
5.4
Test three specimens per clad side with the conductor
on the inside of the loop. The reciprocating travel should not
exceed 10 cycles per minute. The loop
travel 25 mm ±
5 mm [effectively, 1 in ± 0.2 in].
5.5
The number of cycles to failure is when electrical discon-
tinuity of the conductor occurs.
5.6
Report the average number of cycles to failure for the
three specimens tested per clad side.
6 Note
Master set of drawings of a similar test fixture as
seen in Figure 2 is available from the IPC office. This fixture is
not commercially available.
IPC-243-1
IPC-243-2
3000 Lakeside Drive, Suite 309S
Bannockburn, IL 60015-1249
IPC-TM-650
TEST METHODS MANUAL
Number
2.4.3
Subject
Flexural Endurance, Flexible Printed Board
Materials
Date
6/11
Revision
E
Originating Task Group
Flexible Circuits Test Methods Subcommittee
(D-15)
Association
Connecting
Electronics
Industries
shall
shall
shall
Figure
1
Flexural
Endurance
Test
Pattern.
(NOTE:
Conductors
are
1.5
mm
±
0.1
mm
[approximately,
0.059
in
±
0.004
in]
wide
on
2.5
mm
±
0.1
mm
[approximately,
0.01
in
±
0.004
in]
centers.)
shall
Figure
2
Typical
Flexural
Endurance
Test
Fixture
Equipment
Material
M
this
历
sf
Methods
Manual
was
voluntarily
established
by
Technical
Committees
of
IPC.
This
material
is
advisory
only
and
its
use
or
adaptation
is
entirely
voluntary.
IPC
disclaims
liability
of
any
kind
as
to
the
use,
application,
or
adaptation
of
this
material.
Users
are
also
wholly
responsible
for
protecting
themselves
against
claims
or
liabililies
for
patent
infringement.
Equipment
referenced
/s
for
fhe
convenience
of
the
user
and
does
not
imply
endorsement
by
IPC.
Page
1
of
1