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首页> 外文会议>International conference on aluminium alloys >Numerical study on the influence of crystallographic texture and grain shape on the yield surface of textured aluminum sheet material
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Numerical study on the influence of crystallographic texture and grain shape on the yield surface of textured aluminum sheet material

机译：结晶组织和晶粒形状对网纹铝片材屈服面影响的数值研究

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The paper investigates by numerical modeling the effects of crystallographic texture and grain shape on the shape of the yield surface of aluminum sheet material at small strains. Different representative volume elements (RVEs) of the material are considered. Plane stress state is assumed in the sheet. A rate-dependent model of crystal plasticity (CP) is used in combination with either the full-constraint (FC) Taylor model or the finite element method (FEM) to compute the volume averaged stress of the material. The effect of different crystallographic textures observed in aluminum alloys on the shape of the yield surface is firstly investigated. An analytical yield function is used to generate yield surfaces for the different crystallographic textures. The deviation between the stress states at yielding computed by FC-Taylor model and the analytical yield surface is used to evaluate the capability of the yield function to fit the anisotropic yield surfaces representing different strong crystallographic textures. Two different shapes of the grains are introduced in the RVEs of CP-FEM in order to study the effect of the grain morphology. Small effects of grain shape are found at small strain compared with the marked influence of crystallographic texture.
机译：本文通过数值模拟研究了小应变下晶体织构和晶粒形状对铝板材料屈服面形状的影响。考虑了材料的不同代表性体积元素（RVE）。工作表中假定为平面应力状态。基于速率的晶体可塑性模型（CP）与完全约束（FC）泰勒模型或有限元方法（FEM）结合使用，可以计算材料的体积平均应力。首先研究了铝合金中观察到的不同晶体学织构对屈服面形状的影响。分析屈服函数用于生成不同晶体学纹理的屈服面。由FC-Taylor模型计算的屈服应力状态与分析屈服面之间的偏差用于评估屈服函数拟合代表不同强晶体织构的各向异性屈服面的能力。为了研究晶粒形态的影响，在CP-FEM的RVE中引入了两种不同形状的晶粒。与晶体织构的显着影响相比，在较小应变下发现了晶粒形状的较小影响。

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