Ultra-low cycle fatigue test device and plastic deformation collection method for round steel pipe

A technology of fatigue test and plastic deformation, which is applied in the direction of measuring device, strength characteristics, and application of repeated force/pulsation force to test the strength of materials, etc., to achieve good safety and stability, and improve the effect of accuracy and stability

Active Publication Date: 2020-08-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Test is a common method to study the performance of round steel pipes under reciprocating loads, but there are no reports on the test equipment and plasticity acquisition methods for ultra-low cycle fatigue tests of round steel pipes

Method used

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  • Ultra-low cycle fatigue test device and plastic deformation collection method for round steel pipe
  • Ultra-low cycle fatigue test device and plastic deformation collection method for round steel pipe
  • Ultra-low cycle fatigue test device and plastic deformation collection method for round steel pipe

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with accompanying drawing.

[0038] refer to Figure 1~4 , the round steel pipe of the present invention applies cyclic reciprocating loading test device, the round steel pipe ultra-low cycle fatigue test device comprises: portal reaction force frame 1, actuator 2, loading bracket 10, limit bracket 4, contact beam 3, flange Disc 11, upper support 6, combined test piece 7 of bolt ball and round steel pipe, bottom support 8, anchor bolts and backing plate 9. The base of the actuator is connected to the crossbeam of the portal reaction frame with long rod anchor bolts (also wound and fastened by wire ropes), and the end of the actuator is connected to the connecting beam 3 with high-strength bolts. The left, right and rear of the square connecting beams The three-way connection limit bracket 4, the other end of the limit bracket 4 is welded with a hook 12 to connect with the chute 5 connected to the reac...

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Abstract

The test device is used for ultra-low cycle fatigue failure test of round steel tubes, and mainly includes a reaction frame device, an FCS electro-hydraulic servo structure test system, a limit device, a bolt ball and steel tube combined test piece, and a boundary fixing system. The operation steps in the test are simple, an actuator is fixed to the door type reaction frame, the force of the actuator acting on the combined structure of the bolt ball and the circular steel tube is ensured as axial force by a three-way horizontal limit bracket when applying load, and the FCS electro-hydraulic servo structure test system applies cyclic reciprocating load to high-strength bolt tube ball assembly components, and collects the data of rod end force and displacement. The entire device is good in safety and stability, improves the accuracy and stability of the test results, and can realize the experimental study of the round steel tubes under ultra-low cycle fatigue.

Description

technical field [0001] The invention relates to a large displacement axial loading test device, in particular to an ultra-low cycle fatigue test device for a combined test piece of a round steel pipe and a bolt ball and a method for collecting the plastic deformation of the steel pipe. Background technique [0002] Long-span public buildings with bolted ball grid structure are required to undertake the function of earthquake shelters in addition to performing daily public activities. The seismic performance of bolted ball grid structure has good research value. Previous earthquake damages have shown that the failure of the bolted ball grid structure under strong earthquakes is characterized by buckling or breaking of the rods, the formation of plastic hinges in the rods and accompanying fractures, etc. These damaged rods have experienced several cyclic plastic strain processes. The failure form has the characteristics of ultra-low cycle fatigue failure. Testing is a common ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/36G01N3/02
CPCG01N3/02G01N3/36G01N2203/0048G01N2203/0073
Inventor 李海旺宋夏芸乔永强张洁晁阳
Owner TAIYUAN UNIV OF TECH
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