【摘要】：基于林位錯(cuò)強(qiáng)化的晶體塑性有限元模型物理意義清晰簡(jiǎn)潔,具有廣泛的應(yīng)用。然而,只考慮林位錯(cuò)強(qiáng)化的模型忽略了共面位錯(cuò)之間的相互作用,導(dǎo)致模擬結(jié)果常常出現(xiàn)異常的扭曲失穩(wěn)現(xiàn)象。針對(duì)以上問(wèn)題,通過(guò)分析位錯(cuò)之間的相互作用,在林位錯(cuò)強(qiáng)化模型中引入自硬化作用對(duì)模型進(jìn)行改進(jìn)。對(duì)改進(jìn)前后兩個(gè)模型模擬單晶體沿單個(gè)和多個(gè)方向拉伸的變形模式以及冷軋鋁板剪切帶的形成特征進(jìn)行了比較。結(jié)果顯示,對(duì)于單晶單滑移,兩個(gè)模型的穩(wěn)定性表現(xiàn)一致;但是對(duì)于單晶多滑移,改進(jìn)前的模型出現(xiàn)了扭曲失穩(wěn),而引入自硬化的改進(jìn)模型對(duì)于多滑移系的模擬符合真實(shí)情況,并改善了模型的穩(wěn)定性問(wèn)題。對(duì)于冷軋鋁板發(fā)生剪切變形時(shí)剪切帶的形成特征,林位錯(cuò)強(qiáng)化模型的不穩(wěn)定性放大了材料的失穩(wěn)變形,模型的低穩(wěn)定性和材料的變形失穩(wěn)疊加,導(dǎo)致預(yù)測(cè)的結(jié)果失穩(wěn)程度過(guò)高;而引入自硬化作用的改進(jìn)模型改善了穩(wěn)定性問(wèn)題,可以真實(shí)地反映材料本身的失穩(wěn)。
[Abstract]:The crystal plastic finite element model based on forest dislocation strengthening has a clear and concise physical meaning and is widely used. However, the model only considering forest dislocation strengthening ignores the interaction between coplanar dislocations, resulting in abnormal distortion and instability of simulation results. In view of the above problems, the self-hardening effect is introduced into the forest dislocation strengthening model to improve the model by analyzing the interaction between dislocations. The deformation modes of single crystal drawing along single and multiple directions and the formation characteristics of cold rolled aluminum sheet shear strip were compared before and after the modified two models were used to simulate the deformation of single crystal in single and multiple directions. The results show that the stability of the two models is the same for single crystal slip. However, for single-crystal multi-slip, the improved model is distorted and unstable, and the self-hardening model is introduced to simulate the multi-slip system in accordance with the real situation, and the stability of the model is improved. For the formation characteristics of shear band during shear deformation of cold rolled aluminum sheet, the instability of the forest dislocation strengthening model magnifies the instability deformation of the material, the low stability of the model and the superposition of the deformation instability of the material lead to the instability degree of the predicted result being too high. An improved self-hardening model is introduced to improve the stability problem, which can truly reflect the instability of the material itself.
【作者單位】： 上海交通大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(22451471107E0108)
【分類號(hào)】：TG111.2

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 洪連山;;鋼管冷形變位錯(cuò)強(qiáng)化遺傳工藝的研究[J];鋼鐵;1987年05期

2 李鴻美;張慧杰;孫力軍;包耀宗;;超低碳鋼的強(qiáng)化機(jī)制研究[J];稀有金屬;2010年S1期

3 許曉靜;宋濤;范真;張振強(qiáng);羅勇;張?jiān)士?劉云輝;;含Sc 2099型鋁鋰合金的組織和位錯(cuò)強(qiáng)化[J];稀有金屬材料與工程;2012年S2期

4 戴麗娟;吳大風(fēng);;低碳微合金化鋼強(qiáng)度提高分析[J];包頭職業(yè)技術(shù)學(xué)院學(xué)報(bào);2004年03期

5 趙杰;徐海峰;時(shí)捷;李箭;蒲健;曹文全;;細(xì)晶強(qiáng)化和位錯(cuò)強(qiáng)化對(duì)中錳馬氏體鋼的強(qiáng)化作用[J];鋼鐵;2012年08期

6 ;[J];;年期

，

本文編號(hào)：2441756