This work focuses on the interpretation of experimental results obtained from fracture toughness tests conducted for a typical metal/polymer bimaterial interface similar to those encountered in electronic packaging applications. Test specimens with pre-implanted interfacial cracks were subjected to a series of fracture toughness tests. Interfacial fracture toughness is interpreted from the experimental results as the critical energy release rate (Gc) at the instant of crack advance. The values of Gc from the experiments are determined using direct data reduction methods assuming linear elastic material behavior. These Gc values are compared to critical energy release rate values predicted by closed-from analyses of the tests, and to critical J-integral values obtained from finite-element analyses of the test specimen geometries. The closed-form analyses assume linear elastic material behavior, while the finite-element analyses assume both linear elastic as well as elastic-plastic material behaviors.

Issue Section:
Technical Papers
Topics:
Fracture toughness, Metals, Polymers, Finite element analysis, Fracture (Materials), Electronic packaging
1.
ASTM Standard D5228-94, 1994, “Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Reinforced Polymer Matrix Composites,” DCB Standard, American Society for Testing and Materials, (ASTM), Philadelphia, PA.
2.
Broek, D., 1986, Elementary Engineering Fracture Mechanics, 4th edition, Kluwer Academic Publishers, Dordrecht, Netherlands.
3.
Carlsson
L. A.
,
Gillespie
J. W.
, and
Pipes
R. B.
,
1986
, “
On the Analysis and Design of the End Notched (ENF) Specimen for Mode II Testing
,”
Journal of Composite Materials
, Vol.
20
, pp.
594
–
604
.
4.
Davidson
B. D.
,
Hu
H.
, and
Schapery
R. A.
,
1995
, “
An Analytical Crack Tip Element for Layered Elastic Structures
,”
ASME JOURNAL OF APPLIED MECHANICS
, Vol.
62
, pp.
294
–
305
.
5.
Hutchinson
J. W.
, and
Suo
Z.
,
1991
, “
Mixed Mode Cracking in Layered Materials
,”
Advances in Applied Mechanics
, Vol.
29
, pp.
63
–
191
.
6.
Liechti
K. M.
, and
Chai
Y. S.
,
1991
, “
Biaxial Loading Experiments for Determining Interfacial Fracture Toughness
,”
ASME JOURNAL OF APPLIED MECHANICS
, Vol.
58
, pp.
680
–
687
.
7.
Matos
P. P. L.
,
McMeeking
R. M.
,
Charalambides
P. G.
, and
Drory
M. D.
,
1989
, “
A Method for Calculating Stress Intensities in Bimaterial Fracture
,”
International Journal of Fracture
, Vol.
40
, pp.
235
–
254
.
8.
Metals Handbook, 1994, 9th edition, Vol. 2, ASM, Materials Park, OH.
9.
Polaha
J. J.
,
Davidson
B. D.
,
Hudson
R. C.
, and
Pieracci
A.
,
1996
, “
Effects of Mode Ratio, Ply Orientation and Precracking on the Delamination Toughness of a Laminated Composite
,”
Journal of Reinforced Plastics and Composites
, Vol.
15
, pp.
141
–
173
.
10.
Rice
J. R.
,
1998
, “
Elastic Fracture Mechanics Concepts for Interfacial Cracks
,”
ASME JOURNAL OF APPLIED MECHANICS
, Vol.
55
, pp.
98
–
103
.
11.
Rybicki
E. F.
, and
Kanninen
M. F.
,
1977
, “
A Finite-Element Calculation of Stress Intensity Factors by a Modified Crack Closure Integral
,”
Engineering Fracture Mechanics
, Vol.
9
, pp.
931
–
938
.
12.
Sundararaman, V., and Davidson, B. D., 1995, “Three New Test Methods for the Determination of Fracture Toughnesses of Bimaterial Interfaces,” in Application of Fracture Mechanics in Electronic Packaging and Materials, EEP-11/MD-64, ASME, New York, pp. 141–154.
13.
Whitney, J. M., Daniel, I. M., and Pipes, R. B., 1984, Experimental Mechanics of Fiber Reinforced Composite Materials, revised edition, monograph number 4, Society for Experimental Mechanics, Society for Experimental Stress Analysis, Englewood Cliffs, NJ.
This content is only available via PDF.
Copyright © 1999
 by The American Society of Mechanical Engineers
You do not currently have access to this content.