【摘要】：通過軸對稱缺口圓柱試件設(shè)計,消除了端面摩擦對金屬(特別是延性金屬)試件壓縮變形行為的影響。基于壓縮過程中外力功與試件內(nèi)能之間的能量守恒原理,推導(dǎo)了壓縮流動應(yīng)力的近似修正公式,并給出了相應(yīng)的迭代修正過程。針對鋁合金2024,利用修正后的流動應(yīng)力-應(yīng)變關(guān)系對壓縮過程中試件的最小橫截面直徑和內(nèi)能進(jìn)行了預(yù)測,并與實驗結(jié)果進(jìn)行了比較。研究結(jié)果表明:在整個壓縮過程中,試件的最小橫截面直徑的預(yù)測值與實驗值吻合,且試件內(nèi)能與實驗外力功始終保持一致,從而驗證了該修正方法的有效性。
[Abstract]:Through the design of axisymmetric notched cylindrical specimens, the effect of end friction on the compression deformation behavior of metal (especially ductile metal) specimens is eliminated. Based on the energy conservation principle between the external force and the internal energy of the specimen during compression, the approximate correction formula of compressive flow stress is derived, and the corresponding iterative correction process is given. Based on the modified flow stress-strain relationship, the minimum cross-section diameter and internal energy of the specimens in the compression process were predicted and compared with the experimental results. The results show that the predicted values of the minimum cross-section diameter of the specimen are consistent with the experimental values during the whole compression process, and the internal energy of the specimen is consistent with the external work of the experiment all the time, which verifies the validity of the modified method.
【作者單位】： 中國工程物理研究院總體工程研究所;
【基金】：國家自然科學(xué)基金資助項目(11472257) 中國工程物理研究院總體工程研究所創(chuàng)新與發(fā)展基金資助項目(13CXJ09)~~
【分類號】：TG146.21

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