抄録
The three dimensional displacement of wrinkles in a thin film caused by tension and shear displacement was measured using the digital image correlation method. First, the measurement technique based on in-plane displacement of two cameras was demonstrated using a steel plate. Next, the three dimensional displacement of the wrinkles was measured. The concavo-convex form of the wrinkles agreed well with the out-of-plane displacement obtained by this technique. The inclined angle of wrinkles was close to the direction of the first principal stress calculated by the theory of elasticity. Therefore, the compressive strain that occurs in the direction perpendicular to the first principal stress direction may cause wrinkles to the thin film. The amplitude and wavelength of wrinkles which were calculated from the scaling law in consideration of the principal stress direction generally agreed well with the experimental results. Moreover, the absolute value of principal stresses calculated from the measured displacement became large in the local portion of the concavo-convex form in wrinkles.
