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Ultrahigh strength hot rolled microalloyed steels of yield strength 690 and 760 MPa with ferrite -bainite microstructure have been developed. Impact toughness of y135 J at 240uC and a ductile -brittle transition temperature of less than approximately 270uC have been obtained in steels of gauge y3 mm. The attractive strength -toughness combination was achieved by applying microalloying concepts and controlled rolling in an interactive manner. Alloy design aspects are qualitatively described in relation to the contributions of solute, grain size, precipitates, and microstructural constituents.MST/4829

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Based on experiments with flat specimens made of injection moulded short glass fibre reinforced polyamide 6.6 with 50 % fibre content the damage accumulation under variable amplitude loading was investigated with the consideration of notches (Kt =1.0, Kt =2.5 and Kt =9.8), mean stresses (R =-1 and R=0) and temperatures (T =RT and 130°C). Furthermore, fatigue tests with components made of the same material were performed. Concluding, the transferability of the determined results obtained with specimens to components was investigated by applying local concepts. These results provide the basis for the structural durability design for components made of short fibre reinforced polymers and serve as input for the calculation methodology