- 摘 要
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劉漢勇1，宋玉普1，李龍2（1 大連理工大學海岸和近海工程國家重點實驗室，大連 116024；2 山東省建筑科學研究院，濟南 250031）
［摘要］在MTS電液伺服疲勞試驗機上進行了直徑70mm的新型不銹鋼吊桿在拉伸荷載作用下的疲勞試驗，疲勞荷載上限為700kN，下限為430kN，在經(jīng)歷了1 546 609次循環(huán)后，吊桿從下部螺紋連接公接頭第一承載齒的根部突然斷裂。采用ANSYS軟件，建立了新型不銹鋼吊桿螺紋連接的二維軸對稱模型，分析了各螺紋承載齒承擔的荷載以及螺紋齒根在拉伸荷載作用下的應力集中系數(shù)，分析結(jié)果表明，應力集中系數(shù)最大值出現(xiàn)在螺紋連接公接頭第一承載齒的根部。同時還分析了螺紋連接的最大應力，結(jié)果表明，螺紋連接頭最大應力的位置與吊桿斷裂面疲勞裂紋源的位置相吻合。
［關鍵詞］不銹鋼吊桿；螺紋連接；疲勞試驗；數(shù)值分析
中圖分類號：U441+.4文獻標識碼：A文章編號：1002-848X(2012)04-0162-04
Fatigue test of arch bridge stainless steel suspender and stress analysis of threaded connection
Liu Hanyong1, Song Yupu1, Li Long2(1 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2 Shandong Provincial Academy of Building Research, Jinan 250031, China)
Abstract:A fatigue test and a finite element analysis on an arch bridge stainless steel suspender with threaded connections were carried out. A suspender which had a diameter of 70mm was tested under axial tensile loads range from 430kN to 700kN. The suspender suddenly failed from the thread root of the first loaded tooth in the pin after 1 546 609 cycles. A two-dimensional axisymmetric modeling ignoring the helix angle of thread was established with finite element software ANSYS to perform a stress analysis of the threaded connection. The stress concentration factors (SCF) at the root of the teeth of pin were investigated under applied external loading. The conclusive results had been drawn from the analysis including load distribution on the threads and location and value of maximum SCF in the pin. The location and value of maximum stress were given. The results show that the location of fatigue crack source on the fracture surface is consistent with the location of maximum stress.
Keywords:stainless steel suspender; threaded connection; fatigue test; numerical analysis
*國家高技術(shù)研究發(fā)展計劃（863計劃）（2007AA11Z133）。
作者簡介：劉漢勇，博士研究生，Email: structliu@yahoo.com.cn。
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