Abstract
An attempt was made to study the fracture toughness of soft soldered composite laminates made from 4340 steel in a vacuum chamber designed permiting a pressure of 0.5 × 10–5 torr. The results obtained by using In-stron testing machine at a rate of 0.0 5 cm/min and XY. Honey-well recorder showed valid KIC values equal to 62.0 MN/m–3/2 . The study of fractoraphs suggested same modes of failure as tested in air. This includes surface cracking in the region of fatigue, Intergranular cracking in the region of S.C., ductile dimples (coalescence voids) and delamination failure in the region of fast fracture. Thus confirming that soft soldered composite laminates behaved in a similier way under plane strain condition both in high vacuum atmosphers and air.
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