Abstract
Based on the analysis and summary of the research and application status of domestic and foreign high-strength steel local buckling fiber hinged rod stability and ordinary steel local buckling fiber hinged rod stability control, this paper proposes a fiber hinged rod suitable for spatial structures subject to local buckling. The new type is high-strength steel composite local buckling fiber hinged pressure rod. The influence of related parameters in the dislocation string model and the dislocation couple model on the ultrasonic nonlinear parameters is deeply analyzed. And, from the perspective of contact nonlinear acoustics, the mechanism of the ultrasonic nonlinear response of the crack is analyzed, and the finite element software ABAQUS is used to simulate it. The relationship between the nonlinear parameter and the internal crack shape of the material is simulated and analyzed, which proves the nonlinearity. A series of nonlinear ultrasonic testing was performed on three groups of FV520B high-strength steel fatigue specimens using a nonlinear testing system. Analyzing the results, it is found that the material has a good ultrasonic nonlinear cumulative effect, and the microcracks have a greater impact on the ultrasonic nonlinear response. The β-N curves under three sets of fatigue tests are obtained. The results show that the nonlinear parameters are very sensitive to the fatigue damage of FV520B high-strength steel, and the ultrasonic nonlinear parameters generally increase with the increase in the number of fatigue cycles.
Highlights
High-strength steel refers to steel with a standard value of yield strength between 460 and 690 MPa
With the development of new steel production processes, such as microalloying technology and thermomechanical treatment technology, highstrength steel, especially compared to earlier high-strength steels, has a higher cleanliness; Nb, V, and Ti are used as the elements. e representative microalloying replaces the traditional carbon element strengthening method, which improves the yield strength of steel, and improves its plasticity and toughness [1]. e new high-strength steel developed by this new process has the characteristics of high strength, good toughness, and good processing and weldability and has been applied in many practical projects at home and abroad [2, 3]
The residual stress will have an unfavorable effect on the stable bearing capacity
Summary
High-strength steel refers to steel with a standard value of yield strength between 460 and 690 MPa. For high-strength steel welded I-shaped section members, in order to make full use of the advantages of high strength, the section design can be more developed, but this can exceed the current specification limits, especially the height-to-thickness ratio of the web [4]. The analysis of the local buckling fiber hinged compression rod of high-strength steel with different slenderness ratios shows that the welding residual stress has little effect on the stable bearing capacity (when the residual stress is not considered, the maximum difference of the stable bearing capacity is only 3.02%). E relationship between the ultrasonic nonlinear parameters of FV520B high-strength steel and the fatigue cycle cycles can be used to characterize the early fatigue damage degree of the material and reflect its fatigue life E nonlinear parameters show an increasing trend with the increase of the number of fatigue cycles. e relationship between the ultrasonic nonlinear parameters of FV520B high-strength steel and the fatigue cycle cycles can be used to characterize the early fatigue damage degree of the material and reflect its fatigue life
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