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 Journal of the Korea Institute of Military Science and Technology 2005;8(3):124-130.
 The effects of matrix aging and residual stress changes on $Avimid^{(R)}$ K3B/IM7 laminates Hyung-Won Kim 수지 노화와 잔류응력 변화가 $Avimid^{(R)}$ K3B/IM7 복합재 적층에 미치는 영향 김형원 국방과학연구소 Abstract In this paper, the effects of matrix hygrothermal aging and residual stress changes on $Avimid^{(R)}$ K3B/IM7 laminates in $80^{circ}C$ water were studied. The factors causing the $80^{circ}C$ water to degradation of the laminates could be the degradation of the matrix toughness, the change in residual stresses. After 500 hours fully saturated aging of the neat resin, the weight gain was 1.55% increase with the diffusion coefficient $7{ imes}10^{-6}m^2/s$ and the fracture toughness was decreased about 41%. After 100 hours fully saturated aging of the $[+45/0/-45/90]_s$ K3B/IM7 laminates in $80^{circ}C$ water, the weight gain was 0.41% increase with the diffusion coefficient $1{ imes}10^{-6}m^2/s$ and the loss of the microcracking fracture toughness was 43.8% of the original toughness. To see whether the residual stress influenced the fracture toughness, two ply $[90^{circ}/0^{circ}]$ laminates were put in $80^{circ}C$ water from 2 hours to 8 hours. The changes in residual stress in 8 hours are less than 3MPa. Because the 3MPa change is not sufficient to degrade the laminates, the main factor to degrade the microcracking fracture toughness was the degradation of the matrix fracture toughness. Key Words: Residual Stress, Matrix, Hygrothermal Aging, Microcracking Fracture Toughness, diffusion
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