FIELD: test of blades of propeller of helicopter under combined loading with cyclic torque and bending load and static expansion. SUBSTANCE: bending load and torque are created by one vibration exciter and lever that carries vibration exciter mounted for movement along its length. Bed is fitted with restoring member with controlled rigidity for tuning of oscillatory system to frequency close to resonance frequencies of flexural and torsional vibrations of tested sample. Restoring member is manufactured in the form of spring bent in plane of swing of lever provided with support movable along its length. Spring is joined to lever with the help of tie-rod. Bed includes first and second joints which axes are perpendicular to specified plane of bending of sample and third joint which axis is located along axis of setting of sample. First joint connects first clamping that anchors one end of sample. Second clamping fixture and lever are attached to body of third joint. Axle of second joint is connected by means of cable system to device for static expansion of sample Axle of third joint is anchored on body or axle of second joint. EFFECT: provision for combined loading of samples in wide range of relations of their flexural and torsional rigidities. 3 dwg
