IPC-TM-650 EN 2022 试验方法.pdf - 第292页

1.0 Scope This test method establishes a procedure for determining the tensile strength, elongation and Young’s modulus of organic free films. 2.0 Applicable Documents ASTM D 618 Standard Practice for Conditioning Plasti…

5.11

least three test specimens, per lot, are tested at

each test temperature.

5.12

To avoid creep and/or thermal effects, keep the total

test cycle time (Steps 5.7 through 5.9) under 2 minutes.

6.0 Evaluation

6.1

The

stress rupture test is quantitative for rupture pres-

sure and for bulge height at each test temperature.

6.2

Report

the rupture pressure and the bulge height at rup-

ture for each test specimen at each test temperature.

6.3

Discard

test specimens with obvious defects and/or evi-

dence of plating artifacts (before or after the rupture test).

IPC-TM-650

Number

2.4.18.2

Subject

Hot

Rupture Strength, Foil

Date

7/89

Revision

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1.0

Scope

This

test method establishes a procedure for

determining the tensile strength, elongation and Young’s

modulus of organic free films.

2.0

Applicable Documents

ASTM D 618

Standard

Practice for Conditioning Plastics and

Electrical Insulating Materials for Testing

ASTM

D 882

Standard

Test Methods for Tensile Properties

of Thin Plastic Sheeting

ASTM

D 1005

Standard

Test Methods for Measurement of

Dry-Film Thickness of Organic Coatings Using Micrometers

ASTM

D 2370

Standard

Test Method for Tensile Properties

of Organic Coatings

3.0

Test Specimen

The

test specimen shall consist of a

strip 12.70 mm wide by 76.20 mm in length and at least 10

µm in thickness. The width of the specimen should not devi-

ate by more than 2% over the length of the specimen

between the grips. The thickness of the films shall not vary by

more than 10% over the entire film. A minimum of ten speci-

mens are required.

4.0

Apparatus or Material

4.1 Thickness Measurement Device

Mitutoyo

519-605

Mini-Checker with a 519-891 probe with vacuum assist con-

nected to a MUX-10 multiplexer or equivalent thickness mea-

surement device accurate and precise to 0.1 µm.

4.2

Width Measurement Device

Micrometer

or equivalent

width measurement device capable of measuring to 0.25 mm.

4.3

Specimen Cutter

Thwing-Albert

JDC Precision Cutter

or equivalent. The specimen cutting device must be capable

of cutting a film strip 12.70 ± 0.25 mm wide over the length of

the specimen. It is imperative that the cutting edges be kept

sharp and free from visible scratches or nicks. The use of

striking dies is not recommended because of poor and incon-

sistent specimen edges.

4.4

Tensile Tester

Instron

Model 4501 Tensile Tester with

a 0.2 kN load cell or equivalent. The testing machine must be

equipped with a load cell whose compliance is a maximum of

2% of the specimen extension within the range being mea-

sured. Digital (as opposed to analog) self-calibrating load cells

are preferred since they eliminate the need for and potential

error associated with calibrating analog load cells using exter-

nal weights. The testing machine must be equipped with a

device for recording the tensile load and the amount of sepa-

ration of the grips; both of these measuring systems should

be accurate to ± 2%. The rate of separation of the grips shall

be accurate to ± 0.1% and capable of adjustment from

approximately 0 to 50 mm/min.

4.5

Gripping Devices

gripping system that minimizes

both slippage and uneven stress distribution must be used.

The grips must be self-aligning, i.e. they must be attached in

such a manner that they will move freely into alignment as

soon as any load is applied so that the long axis of the speci-

men will coincide with the direction of the applied pull through

the center line of the grip assembly.

4.6

Grip Faces

Specimen

slippage and necking of the

specimen up into the grips are two of the most common

problems with this test method. Slippage can be checked by

drawing a series of parallel lines across the part of the speci-

men in the grips. After pulling the specimen, if the lines are not

parallel, the specimen may be slipping on one side. On speci-

mens with high elongations, necking of the specimen into the

grips is a problem. As the specimen elongates, the reduction

of area (necking) results in a loosening of the specimen at the

inside edges of the grips. This loosening propagates further

back into the grips with continued elongation of the specimen.

This can lead to erroneous results for the elongation. Air-

actuated grips lined with rubber faces (e.g., neoprene) that

have been machined flat were found to be effective against

both of these problems and still allowed the specimen to be

easily removed from the grips after the test. Another approach

is to use line grips, i.e. grips having faces designed to concen-

trate the entire gripping force along a single line the width of

the specimen perpendicular to the direction of the testing

stress. This is usually done by combining one standard flat

grip face and an opposing grip face that has been cut down.

In cases where specimens frequently fail at the edge of the

grips, it may be advantageous to round the edges of the grip

faces where they meet the test area of the specimen.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.18.3

Subject

Tensile

Strength, Elongation, and Modulus

Date

7/95

Revision

Originating Task Group

Deposited Dielectric Task Group (C-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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4.7

Extension Indicators (optional)

Extension

indicators

(e.g., extensometers) must be designed as to minimize stress

on the specimen at the contact points of the specimen and

the indicator. Clip type extensometers are not recommended

for this reason. Laser extensometers can be used if the

method of marking the specimen does not induce any stress

or strain into the specimen (e.g., scratching the specimen) or

change the specimen in any fashion (e.g., heating the

specimen).

4.8

Calibration

The

thickness gauge should be calibrated

every six months using standard gauge blocks. The blades on

the film cutter should be resharpened or replaced at least

once a year. The load cell on the tensile tester should be cali-

brated at least once a week following the manufacturer s rec-

ommended procedure. Also, the stops which control the ini-

tial grip separation should be checked once a week.

5.0

Procedure

5.1 Operating Conditions

The

tests should be conducted

at 23 ± 2°C and 50 ± 5% relative humidity.

5.2

Preparation of Test Specimens

5.2.1

The

test specimens should be conditioned at 23 ±

2°C and 50 ± 5% relative humidity for not less than 24 hours

prior to testing. Refer to ASTM D 618.

5.2.2

The

free films are placed between two cover sheets of

clear film (MylarT* or equivalent) to facilitate handling of the

specimens.

5.2.3

Cut

at least 10 specimens 76.20 mm long and 12.70

mm wide. No specimen shall vary by more than 2% in width

along its entire length. The utmost care must be exercised in

cutting specimens to prevent nicks and tears along the edges

of the specimen that are likely to cause premature failure. If

the properties in the plane of the film are not isotropic (e.g.,

the films were not prepared by spin coating), then ten films

must be cut in both the machine direction (MD) and transverse

direction (TD).

5.4

Testing

5.4.1

Measure

and record the thickness of the test speci-

men to an accuracy of 0.1 µm at no fewer than five different

places within the gauge length area. Refer to ASTM D 1005

and AST D 2370.

5.4.2

Set

the initial gauge length (grip separation) at 25.4

mm and the rate of grip separation at 5.08 mm/min.

5.4.3

Place

the specimen in the grips of the testing

machine, taking care to align the long axis of the specimen

with an imaginary line joining the points of attachment of the

grips to the machine. The specimen should be aligned as per-

fectly as possible with the direction of pull so that no rotary

motion that may induce slippage will occur in the grips.

Tighten the grips evenly and firmly to the degree necessary to

minimize slipping of the specimen during testing. The use of

air activated grips facilitates the mounting of the specimen in

the grips.

5.4.4

Start

the test and record the load versus extension.

5.4.5

Repeat

steps 5.4.1 - 5.4.4 for each series of ten

specimens.

5.5

Calculations

5.5.1

For

each series of ten specimens, the arithmetic mean

and standard deviation of each property for the specimens

with the five highest tensile strengths shall be calculated to the

proper number of significant figures. This is done on the basis

that the expected errors (nicks or flaws in the specimen,

breaks within the grips, specimen slippage, etc.) would all

tend to produce lower results. The standard deviation is cal-

culated as follows and reported to two significant figures:

√

i = 1

−

(

i = 1

)

N(N−1)

where

Xi is the value of a single observation (i = 1 through N),

N is the number of observations, and s

the estimated stan-

dard deviation.

5.5.2

Tensile Strength

Tensile

strength is calculated by

dividing the load at break by the original minimum cross-

sectional area. The result is expressed in megapascals (MPa)

and reported to three significant figures.

tensile strength =

(load at break)

(original

width)(original thickness

5.5.3

Percent Elongation

Percent

elongation is calculated

by dividing the elongation at the moment of rupture by the ini-

tial gauge length and multiplying by 100. When gauge marks

or extensometers are used to define a specific test section,

IPC-TM-650

Number

2.4.18.3

Subject

Tensile

Strength, Elongation, and Modulus

Date

7/95

Revision

age2of3

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