本文選題：純銅　切入點(diǎn)：后繼屈服　出處：《力學(xué)學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：通過純銅薄壁圓管試樣的實(shí)測(cè)和晶體塑性模擬,用單試樣法和多試樣法對(duì)分別經(jīng)歷拉伸、扭轉(zhuǎn)和組合拉扭變形的試樣后繼屈服面進(jìn)行研究.考慮預(yù)變形方式、測(cè)點(diǎn)數(shù)目、測(cè)試順序和指定平移應(yīng)變等不同條件,對(duì)后繼屈服面測(cè)定結(jié)果差異及屈服面內(nèi)凹現(xiàn)象進(jìn)行探討.在此基礎(chǔ)上,比較了單試樣和多試樣兩種方法的合理性與有效性.數(shù)值模擬采用能反映Bauschinger效應(yīng)的晶體塑性模型,試樣有限元模型每個(gè)單元的晶體取向均隨機(jī)生成,能反映多晶材料變形特征.模擬試驗(yàn)加載過程與真實(shí)試驗(yàn)一致.研究表明:(1)采用本文方法可再現(xiàn)真實(shí)試驗(yàn)過程,模擬后繼屈服面測(cè)試展示的現(xiàn)象與實(shí)測(cè)相近,證實(shí)了方法的有效性和合理性;(2)模擬測(cè)試與實(shí)測(cè)均發(fā)現(xiàn),薄壁圓管組合拉扭加載測(cè)得的后繼屈服面可能出現(xiàn)內(nèi)凹,單試樣法測(cè)得屈服面的內(nèi)凹現(xiàn)象尤為顯著;(3)若試驗(yàn)材料的材質(zhì)比較一致,用多試樣法測(cè)試后繼屈服比用單試樣法更合理.
[Abstract]:Based on the measurement and crystal plastic simulation of pure copper thin-walled tube specimens, the subsequent yield surfaces of specimens subjected to tensile, torsional and combined tensile and torsional deformation were studied by single specimen method and multi-specimen method respectively. The number of measuring points was taken into account in the pre-deformation mode. In this paper, the difference of the measurement results and the concave phenomenon of the yield surface are discussed under different conditions, such as the test sequence and the specified translation strain. The rationality and validity of the single and multi-sample methods are compared. A crystal plastic model reflecting the Bauschinger effect is used in the numerical simulation. The finite element model of the sample is generated randomly for each element. It can reflect the deformation characteristics of polycrystalline material. The loading process of simulated test is consistent with that of real test. The research shows that the real test process can be reproduced by using the method in this paper, and the phenomenon of simulating subsequent yield surface test is similar to that of real test. The validity and reasonableness of the method are verified. (2) it is found that the subsequent yield surface measured by combined tension and torsional loading of thin-walled circular pipes may have an internal concave. The concave phenomenon of yield surface measured by single specimen method is especially obvious. If the material material is consistent, it is more reasonable to test subsequent yield with multi-sample method than with single sample method.
【作者單位】： 廣西大學(xué)土木建筑工程學(xué)院工程防災(zāi)與結(jié)構(gòu)安全教育部重點(diǎn)實(shí)驗(yàn)室/廣西防災(zāi)減災(zāi)與結(jié)構(gòu)安全重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(11472085,11272094,11632007) 廣西科技廳項(xiàng)目(桂科合1599005-2-5) 廣西區(qū)優(yōu)秀博士學(xué)位論文培育項(xiàng)目(YCBZ2015008)資助
【分類號(hào)】：O344.1

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