Four-point bending test device for full-size metal composite tube

Abstract

The invention relates to a four-point bending test device for a full-size metal composite tube. The four-point bending test device for the full-size metal composite tube mainly comprises a base, two load supporting columns, clamping buckles for a detected metal composite tube, two loading oil cylinders, a controller, a sensor, a strain foil and a strain gauge, wherein intervals between the two loading oil cylinders and the adjacent load supporting columns are equal; the sensor is used for transmitting the pressure and stroke of each loading oil cylinder to the controller; and the strain foil transmits the local strain and stress size of the detected metal composite tube to the strain gauge. According to the structure, the whole full-size metal composite tube can be tested; the ends of the piston rods of the loading oil cylinders are hinged with the clamping buckle, so that the clamping buckle can be automatically changed and regulated along with a bending angle of a steel tube; and the clamping buckles for the detected metal composite tube can longitudinally rotate relative to the load supporting columns, so that a clamp can be always in surface contact with the steel tube. Therefore, the four-point bending test device for the full-size metal composite tube has the characteristics of simple structure, reasonable design and convenience in operation and application, and can detect the strain size and the stress size.

Description

technical field [0001] The invention relates to a bending test device for a metal mechanical composite pipe, in particular to a bending test device for a full-scale metal composite pipe. Background technique [0002] The bimetallic composite pipe is composed of an outer carbon steel base pipe and an inner corrosion-resistant alloy liner in a mechanical or metallurgical manner. It organically combines the anti-corrosion performance of corrosion-resistant alloy steel with the excellent mechanical properties of carbon steel pipe. Bimetallic mechanical composite pipes have been rapidly applied and developed in the fields of petroleum, natural gas, and chemical industry due to their high cost performance. The base pipe of carbon steel pipe and the stainless steel liner pipe are mechanically composited by dissimilar metals. When bending, there will be phenomena such as the separation of the base lining and the wrinkling of the liner pipe. The inspection device can detect the maxi...

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Problems solved by technology

The technical solution of the above-mentioned patent has the following defects: 1. The two ends of the metal pipe to be tested are fixed on the pull plate. When the metal pipe is deformed under the action of the hydraulic cylinder, in the natural state, the two ends of the metal pipe will A certain turning occurs, and due to the fixing of the pull plate, the pull plate cannot turn with the rotation of both ends of the metal pipe, so the above design is very unreasonable, and it cannot guarantee that the fixture and the steel pipe will always maintain surface contact, so it will affect the accuracy of the detection; 2. The entire steel pipe cannot be tested; 3. In addition, the above-mentioned structure and function are relatively single, and the local strain and stress of the metal composite pipe to be tested cannot be detected

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