【摘要】：Q235B鋼材在中國建筑領(lǐng)域應(yīng)用廣泛,但目前卻缺乏該類鋼材的空穴增長模型(VGM模型)和應(yīng)力修正臨界應(yīng)變模型(SMCS模型)等微觀損傷模型韌性參數(shù).為此,取材自熱軋無縫鋼管以及冷焊鋼管母材、熱影響區(qū)、焊縫區(qū)的4種Q235B鋼材,加工了8個光滑圓棒試件和24個缺口圓棒試件,通過系列單軸拉伸試驗,輔以數(shù)值分析及電鏡掃描試驗,獲得了Q235B鋼材的VGM和SMCS模型韌性參數(shù),確定了Q235B鋼材的特征長度,然后試驗驗證VGM和SMCS模型對Q235B鋼材韌性斷裂的預(yù)測效果.結(jié)果表明:VGM與SMCS模型對Q235B鋼材韌性斷裂預(yù)測效果均很理想.
[Abstract]:Q235B steel is widely used in the field of construction in China, but at present it lacks the toughness parameters of micro-damage model such as hole growth model (VGM model) and stress-modified critical strain model (SMCS model). For this reason, four kinds of Q235B steels, including 4 kinds of Q235B steel materials, including the base metal of cold welded steel tube, the base material of cold welded steel pipe and the steel tube of cold welding, were used for this purpose. Eight smooth round bar specimens and 24 notched round bar specimens were processed, and a series of uniaxial tensile tests were carried out. The toughness parameters of VGM and SMCS models of Q235B steel were obtained by numerical analysis and scanning electron microscope test. The characteristic length of Q235B steel was determined, and the prediction effect of VGM and SMCS models on Q235B steel ductile fracture was verified by experiments. The results show that both VGM and SMCS models are effective in predicting ductile fracture of Q235B steel.
【作者單位】： 北京交通大學(xué)土木建筑工程學(xué)院;中輕國際工程公司;
【基金】：國家自然科學(xué)基金面上項目(51278036) 中國鐵路總公司科技研發(fā)計劃項目(2013T002-A-2) 教育部高等學(xué)校學(xué)科創(chuàng)新引智計劃項目(B13002)
【分類號】：TU511.3

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