Electromechanical hydraulic loading system for film biaxial tensile test

Abstract

The invention provides an electro-hydraulic loading system of a thin-film biaxial tensile testing machine, belonging to the technical field of mechanics of materials and building materials. The system provided by the invention comprises a low-pressure filter, a hydraulic pump, a motor, a check valve, a pressure sensor, a stop valve, a power accumulator, an electromagnetic unloading valve, a proportional overflow valve, a throttling valve, an electromagnetic directional valve, four servo hydraulic cylinders, a drawing force and compression force sensor, a displacement sensor, a mechanical clamp, a filter, a cooler, an electromagnetic water valve, an oil tank and a unidirectional intercept valve. The system provided by the invention has the advantages of great drawing force, high precision,fast control response, simplicity, special purpose, movability and independent use and can be used for the thin-film composite material biaxial tensile testing machines of construction film material tests, airship skin tests and the like.

Description

technical field [0001] The invention relates to a device in the technical fields of material mechanics and building materials, in particular to an electromechanical-hydraulic loading system for a film biaxial tensile test. Background technique [0002] Polymer composite fabric film materials are lightweight, high-strength, chemical-resistant, and durable, and are used in modern architectural structures, aerospace and other industrial fields, such as architectural membrane structures, aviation airships, aerospace parachutes or soft landing systems. Fabric film is generally composed of base cloth and coating. The base cloth is made of polymer materials and synthetic fibers are woven into cloth. In the field of construction, there are mainly polyester fibers, glass fibers, etc. In the field of aerospace, there are mainly polyester fibers, Aramid fiber, nylon fiber, etc., the coating mainly includes polytetrafluoroethylene and polytetrafluoroethylene, and the coating or laminati...

AI Technical Summary

Problems solved by technology

The pneumatic cylinder is large and the pressure is small, and a large air compressor is required for the air pressure source; the motor and the screw are designed together, and the stepping motor can achieve higher precision and greater pulling force; the hydraulic pressure has small cylinder, large pulling force, fast response, and high precision. However, there is no specific hydraulic and electronically controlled loading system for film biaxial tensile testing machines, and hydraulic and electronically controlled loading in general-purpose structural laboratories such as MTS is very complicated and expensive

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