STRAIN HISTORY IN FAST AND CONVENTIONAL CURING EPOXY MATRIX COMPOSITES INVESTIGATED BY FBGs

Abstract

Abstract: Cure residual strain, which is generated by curing shrinkage of resin and mismatch of the coefficient of thermal expansion of the resin and the fiber in curing process of fiber reinforced resin matrix composite, is essential to allow better design and control of properties of the resin matrix composite. In this paper, nondestructive and destructive testing of the cure residual strain were introduced. Fiber Bragg grating sensors (FBGs) were located in ten-ply unidirectional carbon-fiber fabrics reinforced fast and conventional curing epoxy matrix composites manufactured by wet lay-up to measure strain history. The result show that the peak temperature due to curing exothermal reaction was 133.7 ℃ in the 5th ply in the fast curing composite when the cure temperature profile was settled at 80 ℃, while it was 106.3 ℃ in the conventional curing composite. Cure residual strain in the 5th ply in the fast and conventional curing composites were -4074.7 με and -2660.8 με, respectively.

Key words: fast curing resin, cure residual strain, fiber Bragg grating sensors, carbon fiber reinforced epoxy matrix composite

CLC Number:

TB332

QI Yi-xin, JU Su, JIANG Da-zhi. STRAIN HISTORY IN FAST AND CONVENTIONAL CURING EPOXY MATRIX COMPOSITES INVESTIGATED BY FBGs[J]. Fiber Reinforced Plastics/Composites, 2018, 0(11): 21-26.

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