The expanded design freedom offered by Additive Manufacture (AM) technologies is stimulating innovation in new directions, but it is also introducing new challenges in material characterisation. The inherent anisotropic behaviour observed in AM materials, like Ti-6Al-4V alloy, is of critical importance to safe and reliable implementation in structurally significant roles. To fully leverage the design freedom offered by AM, an accurate modelling capability is required to characterise this material behaviour. Building on the limited research efforts to date, this paper proposes a model that combines the Hill48 anisotropic yield function with the nonlinear multicomponent Armstrong-Frederick kinematic hardening rule. This model permits the accurate simulation of the anisotropic behaviour of these materials both under monotonic tensile and cyclic elastic-plastic loading. The performance of the model was evaluated by comparing the results of simulation with previously published stepped symmetric strain-controlled experimental data for Ti-6Al-4V fabricated via SLM in the three primary build orientations. An efficient process to establishing the model parameters from limited tests is also presented. The results of the simulations are in good agreement with the experimental data, thus demonstrating the proposed model’s capacity to simulate efficiently the difference in cyclic stress-strain evolution between different build orientations.

增材制造（AM）技术所提供的扩展的设计自由性正在朝着新的方向刺激创新，但同时也给材料表征带来了新的挑战。在AM材料（例如Ti-6Al-4V合金）中观察到的固有各向异性行为对于在结构上扮演重要角色的安全可靠实施至关重要。为了充分利用AM提供的设计自由度，需要一种精确的建模功能来表征这种材料行为。在迄今为止有限的研究努力的基础上，本文提出了一个将Hill48各向异性屈服函数与非线性多分量Armstrong-Frederick运动硬化规则结合的模型。该模型允许在单调拉伸和循环弹塑性载荷下精确模拟这些材料的各向异性行为。通过将模拟结果与先前发布的通过SLM在三个主要构造方向上制造的Ti-6Al-4V的阶梯对称应变控制实验数据进行比较，评估了模型的性能。还介绍了从有限的测试中建立模型参数的有效过程。仿真结果与实验数据非常吻合，从而证明了所提出的模型能够有效地仿真不同构造方向之间的循环应力-应变演化差异。通过将模拟结果与先前发布的通过SLM在三个主要构造方向上制造的Ti-6Al-4V的阶梯对称应变控制实验数据进行比较，评估了模型的性能。还介绍了从有限的测试中建立模型参数的有效过程。仿真结果与实验数据非常吻合，从而证明了所提出的模型能够有效地仿真不同构造方向之间的循环应力-应变演化差异。通过将模拟结果与先前发布的通过SLM在三个主要构造方向上制造的Ti-6Al-4V的阶梯对称应变控制实验数据进行比较，评估了模型的性能。还介绍了从有限的测试中建立模型参数的有效过程。仿真结果与实验数据非常吻合，从而证明了所提出的模型能够有效地仿真不同构造方向之间的循环应力-应变演化差异。