The interfacial fracture resistance of a polyimide passivation/underfill interface was measured using an asymmetric double cantilever beam technique. A thin layer of polyimide was coated on a standard epoxy as one of the beams and an underfill was flowed over the polyimide film and cured to form the second beam. The relative contributions of the thermal and mechanical stress were systematically varied by varying the thickness ratio of the two beams. The results indicate that the effect of thermal residual stress must be taken into account in the calculation of critical strain energy release rate to obtain the interfacial fracture energy.

1.
Kim
K. S.
, and
Kim
J.
, “
Elasto-Plastic Analysis of the Peel Test for Thin Film Adhesion
,”
ASME Journal of Engineering Materials and Technology
, Vol.
110
,
1988
, pp.
266
273
.
2.
Brown
H. R.
, “
Mixed-Mode Effects on the Toughness of Polymer Interfaces
,”
Journal of Materials Science
, Vol.
25
,
1990
, pp.
2791
2794
.
3.
Creton
C.
,
Kramer
E. J.
,
Hui
C. Y.
, and
Brown
H. R.
, “
Failure Mechanisms of Polymer Interfaces Reinforced with Block Copolymers
,”
Macromolecules
, Vol.
25
,
1992
, pp.
3075
3088
.
4.
Xiao
F.
,
Hui
C. Y.
, and
Kramer
E. J.
, “
Analysis of a Mixed Mode Fracture Specimen: The Asymmetric Double Cantilever Beam
,”
Journal of Materials Science
, Vol.
28
,
1993
, pp.
5620
5629
.
5.
Smith
J. W.
,
Kramer
E. J.
,
Xiao
F.
,
Hui
C. Y.
,
Reichert
W.
, and
Brown
H. R.
, “
Measurement of the Fracture Toughness of Polymer-non-Polymer Interfaces
,”
Journal of Materials Science
, Vol.
28
,
1993
, pp.
4234
4244
.
6.
Washiyama
J.
,
Creton
C.
,
Kramer
E. J.
,
Xiao
F.
, and
Hui
C. Y.
, “
Optimum Toughening of Homopolymer Interfaces with Block Copolymers
,”
Macromolecules
, Vol.
26
,
1993
, pp.
6011
6020
.
7.
Washiyama
J.
,
Kramer
E. J.
, and
Hui
C. Y.
, “
Failure Mechanisms of Polymer Interfaces Reinforced with Block Copolymers: Transition from Chain Pullout to Crazing
,”
Macromolecules
, Vol.
26
,
1993
, pp.
2928
2934
.
8.
Xiao
F.
,
Hui
C. Y.
,
Washiyama
J.
, and
Kramer
E. J.
, “
Phase Angle Effects on Fracture Toughness of Polymer Interfaces Reinforced with Block Co-polymers
,”
Macromolecules
, Vol.
27
,
1994
, pp.
4382
4390
.
9.
Kanninen
M. F.
, “
An Augmented Double Cantilever Beam Model for Studying Crack Propagation and Arrest
,”
International Journal of Fracture
, Vol.
9
,
1973
, pp.
83
92
.
10.
Suo
Z.
, and
Hutchinson
J. W.
, “
Interface Crack Between Two Elastic Layers
,”
International Journal of Fracture
, Vol.
43
,
1990
, pp.
1
18
.
11.
Sha
Y.
,
Hui
C. Y.
,
Kramer
E. J.
,
Hahn
S. F.
, and
Berglund
C. A.
, “
Fracture Toughness and Failure Mechanism of Epoxy/Rubber-Modified Polystyrene (HIPS) Interfaces Reinforced by Grafted Chains
,”
Macromolecules
, Vol.
29
,
1996
, pp.
4728
4736
.
12.
Chapra, S. C., and Canale, R. P., Numerical Methods for Engineers, 2nd ed., chap. 5, McGraw-Hill, Inc., 1985, pp. 750–768.
13.
Rice
J. R.
, “
Elastic Fracture Mechanics Concepts for Interfacial Cracks
,”
ASME Journal of Applied Mechanics
, Vol.
55
,
1988
, pp.
98
103
.
14.
Beer, F. P., and Johnston, E. R., Jr., Mechanics of Materials, McGraw-Hill, Inc., 1981, pp. 450–451.
15.
Calistri-Yeh
M.
,
Kramer
E. J.
,
Sharma
R.
,
Zhao
W.
,
Rafailovich
M. H.
,
Sokolov
J.
, and
Brock
J. D.
, “
Thermal Stability of Self-Assembled Monolayers from Alkylchlorosilanes
,”
Langmuir
, Vol.
12
,
1996
, pp.
2747
2755
.
This content is only available via PDF.
You do not currently have access to this content.