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以航空航天用去应力退火TA18(Ti-3Al-2.5V)钛管为对象,通过对不同来源、不同规格的钛管整管单拉试验,获得了该高强钛管的显著材料性能波动范围;基于显/隐式结合有限元算法所建立的钛管数控绕弯-回弹全过程有限元模型,阐明了弹性模量、屈服强度、硬化指数和厚向异性指数波动下高强钛管回弹的显著的线性和非线性行为,与显著工艺参数对高强钛管数控弯曲回弹的影响规律进行了对比,进而获得了材料参数波动下高强钛管回弹对截面扁化的影响规律。
Taking the Ti18Al-Ti alloy tube of Ti18Al-2.5V annealed in aerospace as the object, the range of significant material property fluctuation of the Ti-6Al-Ti tube was obtained through the single-pull test of the whole tube of titanium tube with different sources and specifications. Based on the explicit / implicit combined finite element method (FEM), the finite element model of the entire process of titanium tube winding around the bend-springback was established, and the elastic modulus, yield strength, hardening index and the anisotropy index Linear and nonlinear behavior of the high strength titanium tube are compared with those of the significant process parameters for NC bending rebound of the high strength titanium tube. The influence of rebound of the high strength titanium tube on cross section flattening is obtained under the fluctuation of material parameters.