(重慶大學(xué)材料科學(xué)與工程學(xué)院，重慶400044)
摘 要: 基于數(shù)據(jù)統(tǒng)計分析提出一種用于表面粗糙度仿真的有限元分析模型最佳尺寸的確定方法，采用最優(yōu)模型分析多種應(yīng)變路徑下鋁合金Al6061材料的晶粒尺寸和織構(gòu)類型對表面粗糙度演變的影響。結(jié)果表明：不同的應(yīng)變路徑下，塑性變形后的表面粗糙度隨著晶粒尺寸的增加而增大；具有較小泰勒因子的織構(gòu)，在變形過程中自身變形協(xié)調(diào)性較好，可以獲得較好的表面質(zhì)量；而在相同的變形條件下，具有相同泰勒因子、不同剪切趨勢的材料在塑性變形后會呈現(xiàn)出不同的表面形貌，織構(gòu)之間的剪切趨勢差異越大，變形后的表面就越粗糙。
關(guān)鍵字: Al6061板；表面粗糙度；晶體塑性；有限元模型；應(yīng)變路徑；晶粒尺寸；織構(gòu)種類
（College of Material Science and Engineering, Chongqing University, Chongqing 400044, China）
Abstract:The optimum crystal model size established method for surface roughness simulation was presented based on data statistic analysis. The influences of grain size and textures ofAl6061 alloy on surface roughness evolution were discussed under different strain routes. The results indicate that the surface roughness after plastic deformation increases with the increase of the grain size under different strain routes. The textures with small Taylor factor have better deformation coordination, which will be beneficial to reduce the surface roughness. Under the same deformation condition, the models with the same Taylor factor and different the shear tendencies present different surface morphologies. And the larger shear tendency difference is, the worse the surface obtained after plastic deformation will be.
Key words: Al6061 sheet; surface roughness; crystal plastic; finite element model; strain route; grain size; texture type
