2006 Volume 47 Issue 1 Pages 101-105
Si–Ti–C–O (Tyrano) fibers, with their advantages of light weight and high strength, are increasingly being applied as structural materials in the fields of aerospace and mover engineering. A twisting has been a serious problem on standard tensile test to evaluate the elasticity, fracture stress and strain of the fibers. Thus, stress–strain curves have been obtained by using developed a novel twisting relaxation tensile tester with the constant strain rate. The twisting relaxation apparently enhances the fracture stress and clearly increases the fracture strain of Si–Ti–C–O (Tyrano) fibers at every fracture probability. Although the twisting relaxation decreases the gradient of stress–strain curve, the elongation induced by relaxation mainly enlarges the fracture stress. Our results and discussion show that the twisting relaxation enhances the reliability against fracture for Si–Ti–C–O (Tyrano) fibers.