3 results about "Increased fatigue" patented technology

A kind of fatigue tester belongs to performance detection device technical field.The utility model discloses a kind of fatigue tester for hydraulic cylinder, reduce the hydraulic cylinder fatigue tester of damage to hydraulic cylinder for carrying out durability experiment for hydraulic cylinder.The utility model includes frame, rotating motor, rotating motor coupling connected with rotating motor motor shaft, servo motor, translation motor, coupling, rotating mechanism and upper installation sliding block mechanism are installed on the frame, servo motor articulation connecting rod mechanism is installed on the frame lower surface, hydraulic cylinder bottom fixing mechanism is installed on the lifting platform screw of servo motor articulation connecting rod mechanism.The utility model increases fatigue detection function on the basis of durability experiment, is separated from manual operation, is completed by mechanical body, increases the safety of personnel, through the design of structure, can be accurately carried out million times experiment without damaging hydraulic cylinder.

This application provides a method and system for predicting the fatigue performance of composite materials based on infrared thermal imaging, belonging to the field of material mechanical property testing technology. The method includes determining the fatigue performance characterization parameters and corresponding static strength values ​​of the composite material to be predicted; constructing a fatigue performance testing system for the composite material; determining the progressively increasing fatigue loading stress and load; applying progressively increasing stress levels of fatigue cyclic loading to the composite material under a given cycle to obtain a temperature field sequence and extracting temperature characteristic parameters characterizing the material's energy dissipation state; based on the temperature characteristic parameters and a composite material damage infrared characteristic library, obtaining the temperature-damage characteristic-stress relationship of the composite material under each cyclic loading level; based on this relationship, obtaining the critical transformation stress of the composite material to be predicted, determining the fatigue limit, and obtaining the fatigue life-stress relationship for fatigue performance prediction. This scheme improves prediction efficiency and accuracy, and avoids misjudgment based on a single parameter.

This invention discloses a grip strength ball for rehabilitation of hemodialysis patients, belonging to the field of medical device technology. It aims to solve the technical problem that existing grip strength balls, which only allow for a single gripping motion, easily increase fatigue in the patient's palm and make it difficult to exercise the fingers. The invention includes an upper hemisphere and a lower hemisphere, connected by a fist-rebounding component. A finger pressing component is arranged on the top of the upper hemisphere, and a telescopic adjustment component is arranged inside the lower hemisphere. The upper and lower hemispheres are adjusted and controlled by the telescopic adjustment component, allowing for both a close proximity state and a separated state. This invention has the advantages of allowing patients to exercise with a hollow fist, sensing the force of the fist grip by applying pressure to the grip strength ball to assess the degree of rehabilitation, and simultaneously facilitating finger flexibility exercises, thus meeting the needs of two types of rehabilitation exercises.