An experimental and numerical study of the behaviour of glass fibre reinforced plastics (GRP) short columns at elevated temperatures

Residual strength testing in pultruded FRP material under a variety of temperature cycles and values

“…The decomposition of polymers increases with the rate of temperature. The specimens in the current study were subjected to temperature cycling but the testing was carried out at Room temperature whereas all other studies have tested specimens at elevated temperatures [19][20][21][22]. where in this equation σ i = stress normal to i plane (i= x,y or z); τ ij = shear stress in ij plane (i and j =x,y or z); ν ij = Poisson ratio in ij plane (i and j =x,y or z); ε i = strain normal to i plane (i= x,y or z); γ ij = shear strain in ij plane (i and j =x,y or z); C 1111 = E x (1-ν yz ν zy )T; C 2222 = E y (1-ν xz ν zx )T; C 3333 = E z (1-ν xy ν yx )T; C 1122 = E x (ν yx +ν zx ν yz )T; C 1133 = E x (ν zx +ν yx ν zy )T; C 2233 = E y (ν zy +ν xy ν zx )T; C 1212 = G xy; C 1313 = G xz; C 2323 = G yz; and 4 It should be noted that E is Elastic Modulus and G is Shear Modulus in a different direction.…”

Fire protection systems for building floors made of pultruded GFRP profiles

“…Experiments reported by Wong et al [15] and Wong and Wang [16] on the compressive strength of GFRP pultruded channel elements at elevated temperatures showed noticeable strength reductions already at 60°C and 90°C, with compressive strengths at those temperatures being 63% and 31%, respectively, of the ambient temperature strength.…”

Heat induced damage detection in composite materials by terahertz radiation

“…First two intact samples (denoted on figures as state 0) were measured twice, then the samples were put to the heat chamber where they remained at the elevated temperature according to the schedule presented in Table 1. Because the temperature Tg for GFRP it is about 90°C-100°C [4] the investigation starts at 100˚C. The maximum temperature was 180˚C and the material remained in the chamber only for one hour, because it started smoking.…”

“…Above this temperature the modulus drops rapidly and quickly approaches zero at about 130°C [3]. Wong et al [4] investigated the influence of the elevated temperature on the compressive strength of short glass reinforced plastic (GRP) C-shaped channels. Based on their observation at temperatures (above 90°C), the sample failure was crushing due to resin softening.…”