A device adapted to provide oscillating stresses having adjustable amplitude and frequency particularly for fatigue testing materials

摘要

1,114,775. Fatigue testing. CARL SCHENCK MASCHINENFABRIK G. m. b. H. June 22, 1965 [June 23, 1964; May 26, 1965], No.26428/65. Heading G1S. Apparatus for the generation of oscillation stresses of adjustable amplitude and frequency in fatigue testing, comprises a shaft 5 mounted in a free-swinging housing 3 and to which flywheels 6 are secured, the shaft 5 being rotated about its own longitudinal axis and about the longitudinal axis of a shaft 4 which is perpendicular thereto. As shown in Fig. 1, the shaft 4 is connected to the housing 3, so that rotational movement of the shaft 4 is transmitted through gearing 7, 8 to rotate shaft 5 in a direction perpendicular to shaft 4. Thus the system of flywheels 6 moves with two angular velocities which are proportional to each other and at right angles. The resultant torque thus produced is sinusoidal and is applied to the object to be tested. In a modification, gear-wheel 8 is connected to a further shaft on a parallel axis to shaft 4 and rotating at the same speed thereto.