IPC-TM-650 EN 2022 试验方法.pdf - 第296页

5.3.2 Elongation shall be calculated by the following for- mula: D 2-D 1 D1 x 100 = % Elongation Where: D1 = Initial grip separation 101.6 mm D2 = Grip separation at break Average the five values obtained for the machine…

Scope

This

test is to determine the tensile strength and

elongation on specimens exposed to mechanical loads.

Applicable Documents

None

Test Specimen

The

test specimen shall consist of a strip

of flexible material 152.4 mm long x 12.7 mm wide. A mini-

mum of 10 specimens, five from the machine direction, and

five from the transverse direction, shall be prepared.

Apparatus

4.1 Equipment

Tinius-Olson

Super L Tester or equivalent

(with appropriate load cell). The machine used for tension test-

ing shall be in current calibration. The loads used in determin-

ing tensile strength shall be within the loading range of the

testing machine.

4.2

Gripping Devices

Various

types of gripping devices

may be used to transmit the measured load applied by the

testing machine to the test specimens. To ensure axial tensile

stress within the gauge length, the axis of the test specimen

should coincide with the centerline of the heads of the testing

machine.

4.3

Sample Cutter

Thwing

Albert Sample Cutter, Model

No. JDC-50, or equivalent.

4.4

Etcher

4.5

Sander

4.6

Micrometer

with 0.0025 mm resolution

4.7

Conditioning

chamber or work area 23°C ± 2°C, 50% ±

5% RH

Procedure

5.1 Preparation of Specimens

5.1.1

Condition

specimens for 24 hours at 23°C ± 2°C and

50% ± 5% relative humidity (RH). Stabilization time may be

reduced if statistically sound evidence has been generated on

the specific product line to support shorter conditioning times

to reach equilibrium.

5.1.2

Cut

at least 10 specimens, 152.4 mm long by 12.7

mm wide, using a precision sample cutter, which produces

smooth and undistorted edges. Specimens may be sanded

on the edges with 400-600 grit emery paper to further smooth

the edges and improve the repeatability of the test.

5.2

Test

5.2.1

Measure

and record the width and thickness of the

specimen at several points along its length. Calculate the mini-

mum cross-sectional area using the measured width. For

coated materials, ignore the thickness of the coating,

assumed to contribute nothing to the tensile properties of the

composite, and use the nominal substrate thickness for the

cross-sectional area calculation.

5.2.2

Set

the grip separation to 101.6 mm and the rate of

grip separation to 50.8 mm per minute.

5.2.3

Place

the test specimen in the grips of the testing

machine, taking care to align it with the centerline of the grips.

There should be no slack in the specimen.

5.2.4

Start

the machine and record load versus extension

(grip separation).

5.3

Evaluation

5.3.1

Tensile

strength shall be calculated by dividing the

load at break by the original cross-sectional area of the speci-

men. Average the five values obtained for the machine direc-

tion samples and report the average. Average the five values

obtained for the transverse direction samples and report the

average.

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.19

Subject

Tensile

Strength and Elongation, Flexible Printed

Wiring Materials

Date

5/98

Revision

Originating Task Group

Flex Peel Strength Test Methods Task

Group (D-13A)

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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5.3.2

Elongation

shall be calculated by the following for-

mula:

D2-D1

100 = % Elongation

Where:

D1 = Initial grip separation 101.6 mm

D2 = Grip separation at break

Average the five values obtained for the machine direction

samples and report the average. Average the five values

obtained for the transverse direction samples and report the

average.

6 Notes

a statistically sound evaluation shows that MD

and TD differ, the direction giving the lower measurement shall

be the only direction tested. If the two are the same, only MD

needs to be tested.

IPC-TM-650

Number

2.4.19

Subject

Tensile

Strength and Elongation, Flexible Printed Wiring

Materials

Date

5/98

Revision

age2of2

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1 Scope This test method is to determine the land bond

strength of unsupported holes, after repeated soldering and

unsoldering, by mechanical pull in the perpendicular plane.

2 Applicable Documents

IPC-2221

Generic Standard on Printed Board Design

3 Test Specimen Any unsupported component hole

sample or test coupon ‘‘A’’ or ‘‘A/B’’ described in IPC-2221.

Three holes per sample or test coupon shall be tested.

4 Apparatus or Material

4.1 Soldering Iron

60-watt soldering iron capable of pro-

ducing a tip temperature of 232 °C to 260 °C [450 °F to

500 °F].

4.2 Force Tester Vertical pull force tester capable of oper-

ating at a speed of 50.0 mm [2.0 in] per minute and measur-

ing up to 9 kg [20 pounds] load.

4.3 Tinned or solder coated copper wire.

5 Procedure

5.1 Preparation

5.1.1

If conductors are connected to the land area, the fol-

lowing procedure is to be followed:

Take a sharp model knife and cut conductor at least 6.0 mm

[0.2 in] away from the land. Place blade of knife on edge of

land area where conductor enters. While holding the blade

down, pull conductor to the land and use knife blade as ful-

crum to break conductor from land without disturbing bond of

the land.

5.1.2 Insert wire so that the portion extending from the sol-

dered side of the circuit may be fitted into the gripping mecha-

nism of a tensile tester. The wires shall have a diameter

between 150 µm and 500 µm [5,906 µin and 19,685 µin] less

than the diameter of the hole. The wires shall not be clinched.

Select suitable wire of sufficient length to connect to gripping

mechanism of bond strength tester.

5.1.3 Insert wire in holes in selected lands and solder to

lands by machine or hand, as applicable. The wire shall not be

clinched.

5.2 Soldering Cycles

5.2.1

The hand soldering and desoldering operation of the

wire shall be performed as follows:

Step 1: Solder wire into lands

Step 2: Remove (desolder) wire from lands

Step 3: Resolder wire into lands

Step 4: Remove (desolder) wire from lands

Step 5: Resolder wire into lands

During the desolder and solder steps, solder every other land

in the row and allow the specimen to cool to room tempera-

ture. Then solder the remaining lands.

5.2.2 During the solder and desoldering steps, the soldering

and/or desoldering iron shall have a tip temperature as follows

(see 6.1):

Method A: 260 °C [500 °F] - Default method

Method B: 315 °C [599 °F]

Method C: 371 °C [700 °F]

5.3 Pull Test

5.3.1

Following the fifth cycle, clamp the test specimen suf-

ficiently in the jaws of the bond tester to assure that the test

specimen is perpendicular to the direction of pull.

5.3.2 Apply a pull at the rate of 50.0 mm per minute [2.0 in

per minute] to the wire on the pattern side of the test speci-

men.

5.3.3 The load must be applied perpendicular to the major

surface of the land. The load shall be applied until failure

occurs or the minimum force as specified by the procurement

documentation is reached. The formula to calculate force for

circular lands is as follows:

π(D2

–D1

)

3000 Lakeside Drive

Bannockburn, IL 60015-1249

IPC-TM-650

TEST METHODS MANUAL

Number

2.4.21

Subject

Land Bond Strength, Unsupported Component Hole

Date

01/07

Revision

Originating Task Group

Rigid Printed Board Performance Task Group

(D-33a)

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.

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