An Investigation of Fatigue Characteristics of Copper Film |
| |
Authors: | Y H Huh D I Kim D J Kim H M Lee S G Hong J H Park |
| |
Institution: | (1) Center for New and Renewable Energy Measurement, Division of Industrial Metrology, Korea Research Institute of Standards and Science, 209 Gajeong-Ro, Yuseong-Gu, Daejeon, 305-340, South Korea;(2) Department of Mechatronics Engineering, Tongmyong University, Nam-gu, Pusan, South Korea |
| |
Abstract: | Tensile and fatigue behaviors of the copper film coated by tin (Sn) were investigated considering S-N relationships and scanning
electron microscope (SEM) observation of fracture surfaces. The fatigue behavior was investigated considering the effect of
load ratio, R. The specimen of 2000 μm width, 8000 μm length and 15.26 μm thickness was fabricated by etching process. Tensile
properties were measured using the micro-tensile testing system and in-plane electronic speckle pattern interferometric (ESPI)
system for measuring the tensile strain during the test. The fatigue tests of the film were carried out in load-control mode
with 40 Hz at three different stress ratios of 0.05, 0.3 and 0.5. The S-N curves, including the slope of the curve and fatigue
limit, at the respective stress ratios were obtained. These curves were dependent on the load ratio. Empirical relationships
indicating the dependency of the fatigue limit and S-N curve on the load ratio were suggested in this study. SEM observation
of the tensile fracture surface showed that the cross-sectional area of the testing section was necked in the direction of
the film thickness (i.e. parallel to the substrate surface normal) and some ductile dimples in the fracture surface were present.
The fracture of the copper film under cyclic loading was progressed in the transgranular fracture mode. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|