發(fā)布時(shí)間：2018-06-15 05:32

  本文選題：后繼屈服面 + 平移應(yīng)變��； 參考：《廣西大學(xué)》2017年碩士論文

【摘要】：本文選用球墨鑄鐵QT600-7薄壁圓管試樣,采用多試樣法,通過不同的拉扭比例進(jìn)行初始屈服面試驗(yàn)和比例路徑、非比例路徑預(yù)加載后繼屈服面試驗(yàn)。其中,比例路徑包括預(yù)拉伸、預(yù)扭轉(zhuǎn)和預(yù)拉扭,非比例路徑沿菱形加載。通過對(duì)初始屈服面和后繼屈服面的分析,研究預(yù)加載路徑、預(yù)變形程度和平移應(yīng)變?nèi)≈祵?duì)后繼屈服面演化的影響。同時(shí),研究塑性應(yīng)變?cè)隽咳≈祵?duì)塑性流動(dòng)方向的影響,并探討初始屈服面和后繼屈服面上塑性流動(dòng)方向與加載面正交方向的相關(guān)性。試驗(yàn)研究結(jié)果表明:1.后繼屈服面往預(yù)加載方向移動(dòng),平移應(yīng)變?cè)叫?移動(dòng)的越多。預(yù)變形程度對(duì)小平移應(yīng)變屈服面的變形影響較大,預(yù)變形程度越大,屈服面的變形也越大。平移應(yīng)變?nèi)≈翟叫?后繼屈服面往預(yù)加載方向移動(dòng)越多,變形也越大;在預(yù)加載方向出現(xiàn)“尖角”現(xiàn)象,在預(yù)加載反方向出現(xiàn)“內(nèi)凹”或扁平現(xiàn)象。隨著平移應(yīng)變?nèi)≈档脑龃?后繼屈服面逐漸接近初始屈服面。2.塑性應(yīng)變?cè)隽咳≈翟酱?塑性流動(dòng)方向越穩(wěn)定。當(dāng)平移應(yīng)變較大時(shí),不同的平移應(yīng)變對(duì)塑性流動(dòng)方向的影響較小。后繼屈服面上的塑性流動(dòng)方向與加載面正交方向的相關(guān)性,與屈服面的變形程度有關(guān),屈服面變形越小,兩者的相關(guān)性越好。
[Abstract]:In this paper, the ductile iron QT600-7 thin wall tube specimen is selected, and the initial yield surface test and proportional path test are carried out by different tensile and torsional ratios, and the subsequent yield surface tests are carried out by non-proportional path preloading. The proportional path includes prestretching, pretorsion and pretension, and the non-proportional path is loaded along a diamond. Based on the analysis of the initial yield surface and the subsequent yield surface, the effects of the preloading path, the degree of predeformation and the translation strain on the evolution of the subsequent yield surface are studied. At the same time, the influence of plastic strain increment on the direction of plastic flow is studied, and the correlation between the direction of plastic flow and the orthogonal direction of loading surface on the initial yield surface and subsequent yield surface is discussed. The experimental results show that: 1. The subsequent yield surface moves towards the preloading direction, the smaller the translation strain, the more the displacement. The degree of predeformation has a great influence on the deformation of the yield surface of small translation strain, and the greater the degree of predeformation, the greater the deformation of the yield surface. The smaller the translation strain is, the more the subsequent yield surface moves to the preloading direction, and the bigger the deformation is, the "sharp angle" occurs in the preloading direction and the "concave" or flattened phenomenon occurs in the reverse direction of preloading. With the increase of translation strain, the subsequent yield surface is close to the initial yield surface. The larger the plastic strain increment is, the more stable the plastic flow direction is. When the translation strain is large, the effect of different translation strain on the direction of plastic flow is small. The relationship between the direction of plastic flow and the orthogonal direction of loading surface is related to the degree of deformation of yield surface. The smaller the deformation of yield surface, the better the correlation between them.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG143.5;TG115.5

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本文編號(hào)：2020884