1.0 Introduction
1.1 Objectives and scope
1.2 Background
2.0 Round robin test program
3.0 Round robin results - phase I
3.1 Thickness measurements
3.2 Test mandrel selection
3.3 Tensile properties
3.4 Grain structure
4.0 Recommendations - phase I
5.0 Copper foil fatigue behavior and cyclic life
predictions
6.0 Round robing results - phase II
6.1 Standard electrodeposited copper foil, CF-E1
6.2 High-ductility electrodeposited copper foil, CF-E2
6.3 High temperature ductility electrodeposited copper
foil CF-E3
6.4 Annealed electrodeposited copper foil, CF-E4
6.5 As-rolled wrought copper foil, CF-W5
6.6 Annealed wrought copper foil, CF-W7
6.7 Low temperature annealable wrought copper foil,
CF-W8
6.8 Ductility results from 40-mil diameter test
mandrels
7.0 Miscellaneous observations
8.0 Summary, conclusions and recommendations
8.1 Conclusions
8.2 Recommendations
References
Appendices
A IPC test plan for copper foil ductility round robin
B IPC test method 2.4.2.1 of IPC-TM-650, "Flexural
Fatigue and Ductility, Foil", August 1980
C Operating instructions for fatigue ductility flex
tester
D Data sheet sample
E IPC test method 2.4.2.1 of IPC-TM-650, "Flexural
Fatigue and Ductility, Foil," Revision A, December
1983
Figures
1 Means, standard deviations and ranges of measured
gauge thicknesses of wrought and electrodeposited
copper foil samples normalized relative to means
from test lab A
2 Means, standard deviations and ranges of measured
gauge and core thicknesses of electrodeposited
copper foil samples normalized relative to means
from test lab A
3 Photomicrographic cross-section of 2 oz./ft2
electrodeposited copper foil sample
4 Means of measured gauge and plating tooth/adhesion
treatment thicknesses differentiated by foil weight
and vendor
5 Manson-Coffin plot (cyclic strain range vs. fatigue
life) showing contributions of elastic and plastic
strains and deviation at extremely low-cycle
fatigue
6 Manson-Coffin plot of a CF-E3-2-S(XM) copper foil
sample showing fatigue data ranging from 4.0 to
185,00 cycles-to-failure superimposed on fatigue
curve predicted from tensile properties
7 Manson-Coffin plot of predicted and experimental
fatigue behavior of CF-E1-1-S and CF-E4-1-S copper
foil samples
8 Manson-Coffin plot of predicted and experimental
fatigue behavior of CF-W5-1-S and CF-W7-1-S copper
foil samples
9 Manson-Coffin plot of predicted and experimental
fatigue behavior of CF-E1-1-S and CF-W5-1-S copper
foil samples
10 Ductility results for standard electrodeposited
copper foil, CF-E1, for various foil weights and
foil vendors
11 Ductility results for high-ductility
electrodeposited copper foil, CF-E2, for various
foil weights and foil vendors
12 Ductility results for high temperature ductility
electrodeposited copper foil, CF-E3, for various
foil weights and foil vendors
13 Ductility results for annealed electrodeposited
copper foil, CF-E4, for various foil weights and
foil vendors
14 Ductility results for as-rolled wrought copper
foil, CF-W5, for various foil weights and foil
vendors
15 Ductility results for annealed wrought copper
foil, CF-W7, for various foil weights and foil
vendors
16 Ductility results for low temperature annealable
wrought copper foil, CF-W8, before and after
annealing for various foil weights and foil vendors
Tables
1 Copper foil sample distribution for ductility round
robin study
2 Tensile strengths of the copper foil samples
submitted for the ductility round robin study
3 Proposed and established minimum ductility
requirements for IPC Standard ANSI/IPC-CF-150
4 Comparison of fatigue lives and ductility results
from tests with 79-, 62- and 40-mil diameter
mandrels