IPC-TM-650 EN 2022 试验方法.pdf - 第239页

1.0 Scope This test is designed to determine the flexural strength of laminates of thicknesses greater than, or equal to, 0.51 mm [0.020 in] by applying a specific load to a specific size and shaped specimen. 2.0 Applica…

5.3.2

Fatigue Test

The

number of cycles to failure is the

flexural fatigue life in fully reversed bending for the bend radius

corresponding to the radius (1/2 diameter) of the test mandrel

used. An average flexural life from at least three specimens

should be reported.

5.3.3

Fatigue Behavior

The fatigue behavior of a sample

can be obtained by determining the flexural fatigue life with a

number of different diameter mandrels. Plotting the results in

a strain range versus fatigue life Manon-Coffin plot log ∆ε =

[2t

/(2tρ +

t)] versus log N allows intrapolation and extrapola-

tion to other bend radii or fatigue lives.

6 Notes

For

further technical details, reference the material

given in 6.1 through 6.3.

6.1

IPC-TP-204

Engelmaier,

W., A New Ductility and Flex-

ural Fatigue Test Method for Copper Foil and Flexible Printed

Wiring, April, 1978

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

given in 6.4.1 and 6.4.2 represent those currently known to

the industry. Users of this test method are urged to submit

additional source names as they become available, so this list

can be kept as current as possible.

6.4.1

Fatigue

Ductility Flex Tester, Universal Mfg. Co., Inc.,

(201) 374-9800, 1168 Grove St., Irvington, NJ 07111.

6.4.2

JDC

Precision Sample Cutter, Model JDC 125-N or

equivalent.

IPC-TM-650

Number

2.4.3.2

Subject

Flexural

Fatigue and Ductility, Flexible Metal-Clad Dielectrics

Date

3/91

Revision

age3of3

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ

1.0

Scope

This

test is designed to determine the flexural

strength of laminates of thicknesses greater than, or equal to,

0.51 mm [0.020 in] by applying a specific load to a specific

size and shaped specimen.

2.0

Applicable Documents

ASTM-D-790

Flexural

Properties for Unreinforced and Rein-

forced Plastics and Insulating Material.

IPC-TM-650

Methods

2.3.6, Etching Ammonium Persulfate

Method 2.3.7, Etching Ferric Chloride

Method 2.3.7.1, Cupric Chloride Etching

3.0

Test Specimens

3.1 Size and Configuration

Dimensions

of the specimens

shall be as shown in Table 1. Edges of the specimens shall be

free of fractures, delamination, or roughness by means of

sanding or equivalent means (do not radius the edges.)

3.2

Quantity and Sampling

Unless

otherwise specified,

four specimens shall be tested, two in the lengthwise and two

in the crosswise direction of the sample sheet or panel.

4.0

Apparatus or Material

4.1 Tester

standard tension and compression test appa-

ratus which can be operated at a constant rate of crosshead

movement shown in Table 1. The error in the load measuring

system shall not exceed ± 1%. The loading nose and supports

shall have cylindrical surfaces. The radius of nose and sup-

ports shall be in accordance with ASTM-D-790 (in order to

avoid excessive indentation).

4.2

Etching

system capable of complete removal of the

metallic cladding.

4.3

Measuring

devices capable of determining specimen

widths to the nearest 0.025 mm [0.001 in] and specimen

thickness to the nearest 0.0025 mm [0.0001 in].

5.0

Procedure

5.1 Specimen Preparation

5.1.1

When

applicable, chemically etch off all metallic clad-

ding in accordance with standard industry etching practices.

For referee purposes, etching shall be in accordance with

2.3.6, 2.3.7, or 2.3.7.1.

5.1.2

Cut

specimens to the size as shown in Table 1 and

smooth the edges of specimens. Measure and record speci-

men width to the nearest 0.025 mm [0.001 in] and thickness

to the nearest 0.0025 mm [0.0001 in].

5.2

Measurement

5.2.1

Set

tester for the required span and crosshead verti-

cal speed as specified in Table 1.

5.2.2

Align

the loading nose and supports so that the axis of

the cylindrical surfaces are parallel and the loading nose is

midway between the supports.

able 1

Specimen

Dimensions Test Parameters

Nominal thickness

[inches]

Width

[inches]

Length

[inches]

Span

mm [inches]

Speed of testing

mm [inches] per min.

0.79

[0.031] 25.4 [1.0] 63.5 [2.5] 15.9 [0.625] 0.51 [0.020]

1.57 [0.062] 25.4 [1.0] 76.2 [3.0] 25.4 [1.0] 0.76 [0.030]

2.36 [0.093] 25.4 [1.0] 88.9 [3.5] 38.1 [1.5] 1.02 [0.040]

3.18 [0.125] 25.4 [1.0] 101.6 [4.0] 50.8 [2.0] 1.27 [0.050]

6.35 [0.250] 12.7 [0.5] 152.4 [6.0] 101.6 [4.0] 2.03 [0.080]

1.) Nominal thicknesses other than those listed shall be prepared and tested in accordance with the next greater nominal thickness.

2.) Width as cut and smoothed to within 5% of nominal shown.

3.) Length as cut (not necessary to smooth) to within 10% of nominal shown.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.4

Subject

Flexural

Strength of Laminates (at Ambient

Temperature)

Date

12/94

Revision

Originating Task Group

MIL-P-13949 Test Methods Task Group (7-11b)

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.

age1of2

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ

5.2.3

Specimens

shall be at room temperature. Center the

specimen on the supports with the long axis of the specimen

perpendicular to the loading nose and supports.

5.2.4

Apply

the load at the speed of testing from Table 1

until the specimen breaks. The load at breakage shall be

recorded in pounds. (P).

5.3

Calculation and Report

5.3.1

Calculate

the flexural strength for each specimen

using the formula below:

S = 3PL

2bd

= Flexural strength in psi

P = Load at breaking (pounds)

L = Span, inch

b = Width of specimen

d = Thickness, inch

5.3.2

Average

the flexural strengths and record in psi.

5.3.3

Report

the specimen thicknesses, individual psi val-

ues, and average psi for each direction; note the orientation of

the sample panel or sheet associated with the direction of the

specimen.

6.0 Notes None

6.1

Additional

information and background useful to the per-

formance of the test may be found in ASTM-D-790.

IPC-TM-650

Number

2.4.4

Subject

Flexural

Strength of Laminates (at Ambient Temperature)

Date

12/94

Revision

age2of2

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ