FIELD: mechanics.
SUBSTANCE: sample is subjected to design load and the time till its destruction is defined. Testing is performed with several types of exposures: compression and/or extension and lateral deflection. Note that compression and/or extension loading at the samples installed in the jaws is performed symmetrically at the expense of reaction of at least one sample with hinged ends. Hinged ends attachments contact with active jaws. The sample is exposed to loading till loss of its pitch stability. Specified load is provided by selection of corresponding ratio of this sample length and cross-section area. Required values of stress with each sample loaded by compression and extension is provided by selection of corresponding area of their cross-section and with laterally deflected samples - by inflexion. The device consists of supporting frame, cross-beams, active and passive jaws, loading mechanism and mechanism of constant load keeping. Mechanism of constant load keeping includes actuating screw with nut connected with active jaw. Supporting frame and fixed cross-beam are equipped with coaxially arranged guide rails. Each guide rail has active and passive jaws for samples. Passive jaws are installed with the possibility of rigid fixation, active jaws - with free movement. Active jaw installed at supporting frame guide rails is connected with lower movable cross-beam via pusher. Active jaw installed at fixed cross-beam guide rails is connected with upper movable cross-beam located between jaw and actuating screw nut via actuating screw. Each movable cross-beam is additionally equipped mainly with a pair of jaws for samples hinged to lower cross-beam upper surface and lower surface coaxially to each other and guide rails. Loading mechanism represents a pair of samples installed in these jaws and loaded at lateral deflection.
EFFECT: increase of method informativity, simplification of device structure and extension of functional capabilities.
2 cl, 1 dwg
