IPC-TM-650 EN 2022 试验方法.pdf - 第281页
5 Conditioning 5.1 Conditioning The test specimens shall be conditioned a t2 3° C±2° C (73.4 °F ± 3.6 °F) and 50% ± 5% relative humidity for not less than 24 hours prior to test. 5.2 Test Conditions Conduct tests in the …
1 Scope This method covers the determination of the force
required to initiate tearing in flexible insulating materials. It is
based on ASTM D1004.
2 Applicable Documents
ASTM D374
Standard Test Methods for Thickness of Solid
Electrical Insulation
ASTM D1004 Standard Test Method for Tear Resistance
(Graves Tear) of Plastic Film and Sheeting
3 Test Specimens
3.1
The specimens shall be prepared using flexible dielec-
tric material. If the flexible dielectric is clad, the copper foil
shall be etched using standard commercial practices.
3.2 Ten specimens, five in the transverse and five in the lon-
gitudinal (machine) directions, shall be cut from the sample
material.
3.3 The test specimens shall conform to the dimensions
shown in Figure 1.
4 Test Equipment
4.1 Testing Machines
A power driven machine of either of
the two following types shall be used.
4.1.1 Static Weighing Constant rate of grip separation
type, negligible movement of the upper jaw.
4.1.2 Pendulum Weighing Constant rate of grip motion
type, constant rate of lower jaw movement, variable upper jaw
movement. Either maximum load indicating devices or record-
ers are permissible in the testing machine. The applied load,
as indicated by a recorder, dial or scale, shall be accurate to
within 12 percent. If an indicating device is used, the indicator
shall remain at the point of maximum load after rupture of the
test specimen.
4.2 Grips A gripping system that minimizes both slippage
and uneven stress distribution on the specimen shall be
used.
4.3 Thickness Measuring Devices Suitable calibrated
ratchet/friction thimble machinist’s micrometer reading to
0.0025 mm [0.0001 in] or less shall be used for measuring
the thickness of the specimens. The micrometer shall con-
form to ASTM D374.
4.4 Die A die having the dimensions shown in Figure 1
shall be used to cut all specimens. The 90° angle shall be
honed sharp with no radius or have a minimum practical
radius, as per ASTM D1004. The cutting edge of the die shall
have a 5° negative rake, and shall be kept sharp and free
from nicks to avoid leaving ragged edges on the specimen.
Cutting may be facilitated by wetting the surface of the sample
and cutting edges of the die with water. The sample shall rest
on a smooth, slightly yielding surface that will not injure the die
blade. Lightweight cardboard or a piece of leather belting is
suitable. Care should be taken that the cut edges of the speci-
men are perpendicular to its other surfaces and that the
edges have a minimum of concavity. NOTE: The test speci-
men results depend on the quality of the die used.
IPC-2416-1
Figure 1 Die for Tear Test Specimen
101.60mm
26.95mm (x2)
25.40mm radius (x2)
Dimensional tolerances ±0.051mm [0.002 in]
Table of Metric-to-Imperial Equivalents
in.
4.0
0.750
1.061
1.000
1.118
2.0
0.500
101.60
19.05
26.95
25.40
28.40
50.80
12.70
mm
28.40mm (x2)
50.80mm (x2)
19.05mm (x2)
19.05mm
radius (x2)
12.70mm radius (x2)
90º±0.5º
3000 Lakeside Drive, Suite 309S
Bannockburn, IL 60015-1249
IPC-TM-650
TEST METHODS MANUAL
Number
2.4.16
Subject
Initiation Tear Strength, Flexible Insulating
Materials
Date
03/14
Revision
B
Originating Task Group
Flexible Circuits Test Methods Subcommittee
(D-15)
Material in this Test 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 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 IPC.
Page1of2
5 Conditioning
5.1 Conditioning
The test specimens shall be conditioned
at23°C±2°C(73.4 °F ± 3.6 °F) and 50% ± 5% relative
humidity for not less than 24 hours prior to test.
5.2 Test Conditions Conduct tests in the Standard Labo-
ratory Atmosphere of 23 °C±2°C(73.4 °F ± 3.6 °F) and 50
± 10 percent relative humidity.
6 Speed of Testing A jaw separation of 25.4 mm [1 in]
shall be used. The rate of travel of the power activated grip
shall be 51 mm [2 in]/minute and shall be uniform at all
times.
7 Procedure
7.1
Measure the thickness of the specimen at several points
to the accuracy limits of the measuring devices specified in
4.3. Record the average thickness in millimeters or microns
[in].
7.2 Place the specimen in the grips of the testing machine
so that the long axes of the enlarged ends of the specimen
are in line with the points of attachment of the grips to the
machine.
7.3 Apply the load at 51 mm [2 in]/minute rate of grip sepa-
ration. After complete rupture of the specimen, the maximum
tearing load in grams [ounces] shall be noted from the dial
scale or recorder chart and recorded. Data from specimens
which break at some obvious flaw or which break in or at the
edges of the grips shall be discarded and retests made.
8 Calculation The average resistance to tearing shall be
calculated from five specimens tested in each principal direc-
tion of orientation. Data shall be recorded as grams [ounces]
of tearing resistance.
9 Report
9.1
Report the average thickness of all specimens.
9.2 Report the average transverse and the average longitu-
dinal initiation tear strength values.
IPC-TM-650
Number
2.4.16
Subject
Initiation Tear Strength, Flexible Insulating Materials
Date
03/14
Revision
B
Page2of2
1.0
Scope
This
method is to determine the average force in
grams required to propagate tearing through a specific length
of the constant radius specimen. Because of the variation of
materials and orientation of fibers, the method has been
designed to compensate and derive acceptable data.
2.0
Applicable Documents
ASTM-D-689
Tear
Strength
3.0
Test Specimens
At
least five specimens from each
direction are required to obtain an average result. They shall
be cut as per Fig. 1. A Thwing-Albert Co. TA63 Sample Cut-
ter, Catalog No. 98 may be used.
4.0
Apparatus
A
Pendulum Impluse Tester from Thwing-
Albert Co., or equal, having: stationary clamp, moveable
clamp, stop catch, pointer and scale.
5.0
Procedure
5.1 Preparation
5.1.1
Cut
specimens, adjust and calibrate apparatus paying
particular attention to the pendulum to be certain it swings
freely.
5.1.2
Separate
clamps 0-10 in. apart and align the speci-
men in the plate perpendicular to the plane of the oscillation
of the pendulum, with the edges of the jaws gripping the
specimen in a horizontal line.
5.1.3
The
clamping surface of the jaws must be at least 1 in.
in width and 0.5 in. in depth.
5.2
Test
5.2.1
Raise
the pendulum to its top position, place speci-
men midway in the clamps so that its upper edge is parallel to
the top of the clamps and the precut initial slit is at the bottom
of and between the clamps at right angles to their top.
5.2.2
Release
the stop latch and tear the specimen.
5.2.3
As
the pendulum section completes its swing, catch it,
being careful not to disturb the position of the pointer.
5.3
Evaluation
Examine
specimen carefully. If torn through
the constant-radius section within approximately 60° on either
side of the vertical line of intended tear, record the pointer
reading to the nearest 0.5 unit. If torn outside the 60°, disre-
gard specimen and test a new piece. Calculate the tearing
resistance in grams (R), as follows:
R =
SxC
n
S
= Corrected scale reading
S = Machine capacity in grams
n = Number of sheets torn
6.0 Notes Thwing-Albert
Instrument Co. is located in Phila-
delphia, Pennsylvania.
Figure
1
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.17
Subject
Tear
Strength (Propagation)
Date
4/73
Revision
Originating Task Group
N/A
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.
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