Application of microline/grid methods to temperature dependent microscopic deformation and damage in CFRP laminates |
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Authors: | N Takeda H Niizuma S Ogihara A Kobayashi |
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Institution: | (1) University of Tokyo, 4-6-1 Komaba, Meguro-ku, 153 Tokyo, Japan;(2) Department of Mechanical Engineering, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamasaki, Noda, 278 Chiba, Japan |
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Abstract: | Tensile tests of CFRP symmetric cross-ply laminates are carried out in a scanning electron microscope (SEM), and microscopic
interlaminar deformation and damage near the transverse crack tip are visualized by microlines or microgrids printed on the
specimen edge surface. The local deformation around the transverse crack tip is observed at 20°C, 80°C, 120°C and 160°C to
evaluate the effect of thermal residual stress on the microscopic deformation and damage in the interlaminar region near the
transverse crack tip. Temperature dependence of the axial crack opening displacement (COD) is also measured. The displacement
field of the specimen edge surface obtained from these experimental results is compared with the theoretical model proposed
by Lee, Allen and Harris. The analysis is modified to consider the temperature effect, and a good agreement is obtained between
the modified theoretical predictions and experimental results. |
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Keywords: | CRFP crack opening displacement crossply laminate interlaminar shear deformation microlines microgrids transverse crack |
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