基于擬全量理論的多步正向成形模擬方法
發(fā)布時間：2019-06-15 10:38
【摘要】：在全量理論的基礎上,引入增量思想,構建了多步正成形算法。其基本原理是在一步正成形的基礎上,適當增加了若干個中間步,依次計算各中間步之間的應變改變量,并以分量形式累加到當前步的總應變,基于全量理論進行Newton-Raphson迭代計算,并將計算結果以應變分量的形式累加到下個中間步計算中,計算對應的彈塑性本構矩陣,從而在計算過程中體現加載歷史的影響,提高了最終的模擬結果精度。設計了方盒件多行程實驗方案,采用電腐蝕方法在初始坯料上刻上圓形網格,進行了10 mm、20 mm、30 mm、40 mm、50 mm五個不同行程的方盒件成形實驗。利用光學方法測量網格變形量并推算出網格應變量,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算精度和計算效率上的對比,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】： 南京工程學院汽車與軌道交通學院;吉林大學汽車仿真與控制國家重點實驗室;
【基金】：國家自然科學基金項目(51075187) 南京工程學院校級科研基金項目(YKJ201433)
【分類號】：U466
[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】： 南京工程學院汽車與軌道交通學院;吉林大學汽車仿真與控制國家重點實驗室;
【基金】：國家自然科學基金項目(51075187) 南京工程學院校級科研基金項目(YKJ201433)
【分類號】：U466
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