Mechanical responses of cold pilgered Zircaloy-4 (Zr-4) tubes are measured under different uniaxial (tension/compression) loading directions. Tensile tests were carried out along three directions: rolling direction (RD), transverse direction (TD) and 45° to the rolling direction (45RD) at quasi static strain rate. Compression test was also performed in the RD. Texture was characterized at intermediate strains with electron backscattered diffraction method. For different uniaxial loading conditions, anisotropic yield stress and strain hardening behavior can be observed. Such complex mechanical behavior is well explained with the variations in activation of deformation mechanisms predicted by the Schmid factor distribution and visco-plastic self-consistent (VPSC) model. In order to calibrate the VPSC model’s parameters more accurately, both mechanical responses and texture changes for four different directional tests are compared with VPSC simulations. The calculated Lankford coefficients are also calibrated with anisotropic tensile results. Furthermore, a deepening understanding of the texture evolution under different loading directions were disclosed based on VPSC method. The results indicate that the activity of deformation mechanisms changes significantly with different uniaxial loading directions. Non-prismatic slips with higher critical resolved shear stress, e.g. basal and pyramidal slip, make larger contributions to the yield and strengthening stress resulting in the highest stress in TD compared with RD and 45RD. Compression test along RD prefers the activation for tensile twinning (TTW). Meanwhile, TTW can be detected in 45RD and TD tension owing to the spread distribution of initial texture towards TD.

在不同的单轴（拉伸/压缩）加载方向上测量了冷轧Zircaloy-4（Zr-4）管的机械响应。在准静态应变率下，沿三个方向（轧制方向（RD），横向（TD）和与轧制方向（45RD）成45°）进行了拉伸试验。在RD中也进行了压缩测试。用电子反向散射衍射法在中等应变下表征织构。对于不同的单轴加载条件，可以观察到各向异性屈服应力和应变硬化行为。通过Schmid因子分布和粘塑性自洽（VPSC）模型预测的变形机制激活中的变化很好地解释了这种复杂的机械行为。为了更准确地校准VPSC模型的参数，将四种不同方向测试的机械响应和纹理变化与VPSC仿真进行了比较。还使用各向异性拉伸结果对计算的Lankford系数进行了校准。此外，基于VPSC方法，揭示了对不同加载方向下的纹理演化的加深理解。结果表明，变形机制的活动随着不同的单轴加载方向而显着变化。与RD和45RD相比，具有较高临界分辨剪切应力的非棱柱滑动（例如，基础滑动和金字塔形滑动）对屈服和加强应力的贡献更大，导致TD中的应力最高。沿RD进行压缩测试时，首选激活为拉伸孪生（TTW）。与此同时，