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首页> 外文期刊>塑性と加工 >Identification of a yield locus of aluminum alloy sheet A5182-O by biaxial tensile tests using cruciform specimens
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Identification of a yield locus of aluminum alloy sheet A5182-O by biaxial tensile tests using cruciform specimens

机译：使用十字形试样通过双轴拉伸试验鉴定铝合金板A5182-O的屈服点

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摘要

The yield locus of as-received aluminum alloy sheet AS 182-O(1mm thickness) is identified precisely using newly designed cruciform specimens. Each arm of the specimen has slits to exclude geometric constraint during the deformation of the centralsquare region at which biaxial stress components are identified. The specimens are subjected to linear loading paths in a servo-controlled biaxial tensile testing machine. The deformation generated in the central square region is confirmed to developuniformly, well beyond the yield points of the aluminum alloy sheet. A yield locus is determined as a contour of equal plastic work 0.227MPa. The measured yield locus is rather close to a Mises locus and is compared with those predicted by conventionalyield functions: Hill's quadratic and '79, '90, '93 yield functions, Logan and Hosford's yield function and Gotoh's biquadratic yield function. The measured yield locus and measured incremental strain vectors have the best agreement with those predictedby Gotoh's yield function, verifying a normality flow-rule. Other yield functions cannot predict accurately the geometry of the yield locus and the in-plane r-value distribution simultaneously.
机译：使用新设计的十字形试样精确地确定了刚接收的铝合金板AS 182-O（厚度1mm）的屈服点。样品的每个臂都有缝隙，以在中心正方形区域变形期间排除几何约束，在中心正方形区域中识别出双轴应力分量。样品在伺服控制的双轴拉伸试验机中经受线性加载路径。确认在中心正方形区域中产生的变形均匀地发展，远远超过铝合金板的屈服点。确定屈服轨迹为相等塑性功为0.227MPa的轮廓。测得的产量位点与米塞斯位点相当接近，并与常规产量函数所预测的产量函数进行比较：希尔的二次函数和'79，'90，'93的产量函数，洛根和霍斯福德的产量函数以及Gotoh的二次产量函数。实测的屈服轨迹和增量应变向量与Gotoh的屈服函数预测的轨迹具有最佳一致性，从而验证了正态流法则。其他屈服函数无法同时准确预测屈服轨迹的几何形状和面内r值分布。

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