Thermal Fatigue Life Estimation Based On CASE Failure Criterion With
Measured Solder Layer Strain
Author(s)
R. Das & H. Lu
Abstract
Thermal fatigue life estimation based on
CASE failure criterion with measured solder
layer strain
R. Das & H. Lu
Department of Mechanical, Aerospace and industrial Engineering
Ryerson University, Canada
Abstract
Thermal fatigue of interconnects is a common root cause of failure for
microelectronics. The estimation of cycles to failure for a solder layer or joint is
one of the critical requirements in the development of reliable electronic
packages. For an assembly, the thermal-mechanical strains are induced mainly
due to the temperature non-uniformity and the mismatch of Coefficients of
Thermal Expansion (CTE) at multi-material joints. Temperature cycling results
in stress cycling that in turn, causes fatigue damage to accumulate in the solder
joints. Many previous studies have reported that the solder deformation due to
the combination of plastic and creep is much larger than the values expected
from a simple calculation based on the thermal expansion mismatch. And the
time-dependent creep o
Keywords
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