Three-Dimensional Cohesive Zone Modeling on Interface Crack Initiation from Nanoscale Stress Concentration

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概要

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• In the previous study, crack initiation from a free edge along an interface between Cr microdot and SiO2/Si substrate was experimentally investigated and theoretically analyzed within the framework of fracture mechanics. Since the size of stress concentrated zone confined to a nanoscale, it was questionable whether the fracture mechanics was still valid or not. The cohesive zone model (CZM) has advantages in describing cracking behavior along an interface. However, its 3-D applicability in nanoscale components has not yet been investigated. In this study, a three-dimensional cohesive zone model of exponential type is used to extract the toughness for the crack initiation along the interface between Cr microdot and SiO2/Si substrate with the nanoscale stress concentration. After the CZM parameters for the Cr/SiO2 interface cracking are calibrated by an experiment, its validity is examined by other experiments. This study demonstrates the applicability of the three-dimensional CZM to the characterization of interface fracture behavior in nanoscale components.

著者

• KITAMURA Takayuki

  Kyoto University

• YAN Yabin

  Kyoto University, Department of Mechanical Engineering and Science, Kyoto University

• SUMIGAWA Takashi

  Kyoto University, Department of Mechanical Engineering and Science, Kyoto University

• SHANG Fulin

  Xi’ an Jiaotong University, Department of Engineering Mechanics, Xi’ an Jiaotong University

• Kitamura Takayuki

  Kyoto Univ. Kyoto Jpn

• Yan Yabin

  Kyoto University

• Sumigawa Takashi

  Kyoto University

• SHANG Fulin

  Xi' an Jiaotong University, Department of Engineering Mechanics, Xi' an Jiaotong University

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