微細(xì)側(cè)銑過(guò)程的有限元建模與仿真（英文）
發(fā)布時(shí)間：2018-07-23 17:54
【摘要】：建立了AISI 4340微細(xì)側(cè)銑的二維有限元模型。將Johnson-Cook本構(gòu)模型與JohnsonCook剪切失效模型相結(jié)合,對(duì)銑削刃旋轉(zhuǎn)過(guò)程中的一個(gè)完整側(cè)銑周期進(jìn)行了仿真。由于沒(méi)有考慮尺寸效應(yīng)的影響,所得到的流動(dòng)應(yīng)力值偏小。因此,建立了應(yīng)變梯度塑性模型,并應(yīng)用其預(yù)測(cè)了切屑的形成、馮米斯應(yīng)力和溫度場(chǎng)。仿真結(jié)果顯示:微細(xì)側(cè)銑過(guò)程中存在尺度效應(yīng),與Johnson-Cook本構(gòu)模型相比,應(yīng)變梯度塑性模型能夠很好地描述微細(xì)側(cè)銑過(guò)程中的尺寸效應(yīng)。最后,將仿真結(jié)果與理論計(jì)算結(jié)果相比較,驗(yàn)證了所建模型的正確性。
[Abstract]:A two-dimensional finite element model of AISI 4340 micro-side milling is established. The Johnson-Cook constitutive model and the JohnsonCook shear failure model are combined to simulate a complete side milling cycle in the process of milling edge rotation. Because the size effect is not considered, the flow stress is smaller. Therefore, a strain gradient plastic model is established and applied to predict chip formation, Vonmins stress and temperature field. The simulation results show that there is a scale effect in the process of micro side milling. Compared with the Johnson-Cook constitutive model, the strain gradient plastic model can well describe the size effect in the process of micro side milling. Finally, the correctness of the model is verified by comparing the simulation results with the theoretical results.
【作者單位】： 重慶科技學(xué)院機(jī)械與動(dòng)力工程學(xué)院;中核核電運(yùn)行管理有限公司;
【基金】：supported by Chongqing Research Program of Basic Research and Frontier Technology (No.cstc2013jcyj A70004) Scientific and Technological Research Program of Chongqing Municipal Education Commission (No.KJ1501314 ) Chongqing University of Science & Technology (No.CK2014Z27)
【分類號(hào)】：TG54
本文編號(hào)：2140181
[Abstract]:A two-dimensional finite element model of AISI 4340 micro-side milling is established. The Johnson-Cook constitutive model and the JohnsonCook shear failure model are combined to simulate a complete side milling cycle in the process of milling edge rotation. Because the size effect is not considered, the flow stress is smaller. Therefore, a strain gradient plastic model is established and applied to predict chip formation, Vonmins stress and temperature field. The simulation results show that there is a scale effect in the process of micro side milling. Compared with the Johnson-Cook constitutive model, the strain gradient plastic model can well describe the size effect in the process of micro side milling. Finally, the correctness of the model is verified by comparing the simulation results with the theoretical results.
【作者單位】： 重慶科技學(xué)院機(jī)械與動(dòng)力工程學(xué)院;中核核電運(yùn)行管理有限公司;
【基金】：supported by Chongqing Research Program of Basic Research and Frontier Technology (No.cstc2013jcyj A70004) Scientific and Technological Research Program of Chongqing Municipal Education Commission (No.KJ1501314 ) Chongqing University of Science & Technology (No.CK2014Z27)
【分類號(hào)】：TG54
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