【摘要】：在全量理論的基礎(chǔ)上,引入增量思想,構(gòu)建了多步正成形算法。其基本原理是在一步正成形的基礎(chǔ)上,適當(dāng)增加了若干個(gè)中間步,依次計(jì)算各中間步之間的應(yīng)變改變量,并以分量形式累加到當(dāng)前步的總應(yīng)變,基于全量理論進(jìn)行Newton-Raphson迭代計(jì)算,并將計(jì)算結(jié)果以應(yīng)變分量的形式累加到下個(gè)中間步計(jì)算中,計(jì)算對應(yīng)的彈塑性本構(gòu)矩陣,從而在計(jì)算過程中體現(xiàn)加載歷史的影響,提高了最終的模擬結(jié)果精度。設(shè)計(jì)了方盒件多行程實(shí)驗(yàn)方案,采用電腐蝕方法在初始坯料上刻上圓形網(wǎng)格,進(jìn)行了10 mm、20 mm、30 mm、40 mm、50 mm五個(gè)不同行程的方盒件成形實(shí)驗(yàn)。利用光學(xué)方法測量網(wǎng)格變形量并推算出網(wǎng)格應(yīng)變量,使用超聲測厚儀測量板料不同行程的厚度變化量。通過幾種不同算法在計(jì)算精度和計(jì)算效率上的對比,證明了多步正成形算法的有效性。
[Abstract]:On the basis of the full quantity theory, the incremental idea is introduced to construct the multi-step orthopaedic forming algorithm. The basic principle is that on the basis of one step positive forming, several intermediate steps are properly added, and the strain change variables between each intermediate step are calculated in turn, and the total strain is accumulated to the current step in the form of component. The Newton-Raphson iterative calculation is carried out based on the full quantity theory, and the calculation results are accumulated into the next intermediate step in the form of strain component, and the corresponding elastic-plastic constitutive matrix is calculated. Thus, the influence of loading history is reflected in the calculation process, and the accuracy of the final simulation results is improved. The multi-stroke experimental scheme of square box parts is designed. The circular grid is engraved on the initial billet by electric corrosion method, and the forming experiments of five different stroke square box parts with 10 mm,20 mm,30 mm,40 mm,50 mm are carried out. The grid deformation is measured by optical method and the grid strain is calculated, and the thickness variation of sheet metal with different stroke is measured by ultrasonic thickness gauge. The effectiveness of the multi-step shaping algorithm is proved by comparing the computational accuracy and efficiency of several different algorithms.
【作者單位】： 南京工程學(xué)院汽車與軌道交通學(xué)院;吉林大學(xué)汽車仿真與控制國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(51075187) 南京工程學(xué)院校級科研基金項(xiàng)目(YKJ201433)
【分類號】：U466

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 林策;彭艷;孫建亮;;考慮初始?xì)堄鄳?yīng)力的板料彎曲回彈理論分析[J];工程力學(xué);2013年09期

2 姜大鑫;武文華;胡平;;高強(qiáng)度鋼板熱成形溫度場數(shù)值模擬分析[J];工程力學(xué);2013年01期

3 陳偉;那景新;;基于全量理論的一步成形正算法[J];吉林大學(xué)學(xué)報(bào)(工學(xué)版);2013年02期

【共引文獻(xiàn)】

相關(guān)期刊論文 前5條

1 陳偉;那景新;;基于擬全量理論的多步正向成形模擬方法[J];工程力學(xué);2016年10期

2 竇鳳樓;李健;袁杰;;基于液壓成形的鈑金件實(shí)驗(yàn)與仿真分析[J];鍛壓技術(shù);2015年10期

3 何成;何歡;裴錦華;陳國平;;考慮溫變效應(yīng)的熱物性參數(shù)RBF辨識方法[J];工程力學(xué);2015年01期

4 史棟勇;胡平;盈亮;申國哲;劉文權(quán);;基于動(dòng)力顯式算法的熱成形數(shù)值模擬預(yù)測[J];工程力學(xué);2014年12期

5 祁濤;李建東;張歡;衡思寧;吳甲;沈p，

本文編號：2500156