Dynamic visualization welding joint shearing stress fatigue test device and method

Abstract

The invention provides a dynamic visualization welding joint shearing stress fatigue test device. The dynamic visualization welding joint shearing stress fatigue test device comprises a rack, one endof a test piece with a welding joint is fixed to the rack, and the other end of the test piece is cantilevered; the cantilevered end of the test piece is separately provided with a power system for applying loads in the axial direction of the welding joint and a stress regulation system; the outer side of the test piece is provided with a mounting frame for mounting the power system and the stressregulation system, one ends of the power system and the stress regulation system are connected with the mounting frame separately, and the other ends of the power system and the stress regulation system are connected with the cantilevered end of the test piece separately; an optical fiber detection system is mounted on the test piece, a visualization monitoring system is arranged at the outer side of the welding joint of the test piece, and a stress application system, the stress regulation system, the optical fiber detection system and the visualization monitoring system are connected to a PLC integration system separately. The invention further provides a method utilizing the device. By means of the device, the welding joint can be subjected to a pure shearing stress effect, and the PLCintegration system can dynamically observe the dynamic change process of the shearing stress of the welding joint more visually and conveniently. The method is easy to operate and refined and meets the requirement for the fatigue test of the shearing stress of the welding joint.

Description

technical field [0001] The invention relates to a shear stress fatigue test device and method, in particular to a dynamic and visualized weld shear stress fatigue test device and method. Background technique [0002] The structure of the steel bridge deck is complex, and welds are often used to connect the various structures. However, due to welding defects and large welding residual stresses in the welds, fatigue damage and fatigue cracks are prone to occur under repeated loads. Common cracks in the steel bridge deck include welds between the top plate and U-ribs, welds between diaphragms and U-ribs, and butt welds between U-ribs. The stress characteristics of parts prone to fatigue cracks are different. For example, the U-rib butt weld mainly bears tensile stress; stress is more pronounced. [0003] At present, the strength or life research of the above structural details usually uses S-N curves for research, but the fatigue strength curves of normal stress and shear str...

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Problems solved by technology

[0004] At present, the fatigue test for the fatigue performance of the steel bridge deck, because the cracking characteristics are difficult to observe, the phenomenon of fatigue cracking may not be found in time, and the cracking process cannot be accurately recorded. Therefore, a test device and test method with full dynamic visualization function are needed

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