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전체 변위장 측정을 통한 변형률 구배 모델의 구성 변수 식별
정익수(Iksu Jeong),조맹효(Maenghyo Cho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Strain gradient theory have been developed recently to demonstrate some phenomena such as size effect that classical continuum mechanics could not predict. Despite of the theoretical development of strain gradient theory, it was difficult to use this theory in practical issues since constitutive models of this theory contain additional parameters which are almost impossible to be identified experimentally. The recent developed full-field measurements techniques like digital image correlation can enable experimental identification of the constitutive parameters in strain gradient theory because it directly couples experiments and numerical analysis. In this research, we developed an identification method using full-field displacement measurements for materials with strain gradient effect. The accuracy and noisedependency of proposed method are tested in the examples of center-cracked specimen and plate with a circular hole.