The Ultimate Bending Resistance of Thin-walled Square Tube with Strengthened Ridgelines

Abstract

<div class="section abstract"><div class="htmlview paragraph">By introducing the yield strength ratio λ of strengthened ridgeline to plate and the strengthening coefficient multiplier R, the theoretical prediction expression of maximum bending moment of thin-walled square tube with strengthened ridgelines under static cantilever bending condition is obtained. Then the software of Hypermesh 13. 0 was used to establish two quasi-static finite element simulation comparison models under the corresponding static cantilever conditions. One model was designed for the original material thin-walled square tube, and another one was designed for the thin-walled square tube with strengthened ridgelines. After that, the LS-DYNA 971 solver was introduced to perform the solution calculations. Through a series of simulation calculations and result analysis, the accuracy of the theoretical expression for the maximum bending moment of a thin-walled square tube with strengthened ridgelines was verified. The simulation results of the maximum bending moment are in good agreement with the corresponding theoretical predictions, and the maximum deviation is less than 10%. The simulation results and deviation analysis show that for a thin-walled square tube with a section size of 56. 36*56. 36mm and a wall thickness of 1. 0mm, when the yield strength ratio λ of strengthened ridgeline to plate is about 4, and the section strengthening areas of four ridgelines account for 9%, the maximum bending moment can be increased by about 27%.</div></div>