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为了研究材料性能参数对管材数控绕弯过程截面畸变的影响规律及敏感性大小,基于ABAQUS非线性有限元平台,建立了高强TA18钛管数控绕弯成形过程有限元模型,并通过文献中的实验结果验证了模型的可靠性,然后采用该模型模拟研究了材料性能波动下高强TA18钛管数控绕弯成形过程的截面畸变行为。结果表明:截面畸变率随着弹性模量、硬化指数的增加或强度系数、厚向异性指数的减小而减小,其减小率分别为11.76%,23.67%,12.07%和23.51%;不同材料性能参数波动下,高强TA18钛管绕弯过程截面畸变率的最大值均小于4.00%,并且在弯曲平面附近,截面畸变率出现负值;截面畸变率对材料性能参数的敏感性大小依次为强度系数、弹性模量、硬化指数和厚向异性指数。
In order to study the influence law of material performance parameters on the cross-sectional distortion of pipe NC bending process and the sensitivity, a finite element model of TA18 titanium pipe bending process was established based on ABAQUS nonlinear finite element platform and verified by the experimental results in the literature The reliability of the model was then simulated using this model to simulate the cross-sectional distortion behavior of the high-strength TA18 titanium tube during the bending process. The results show that the rate of cross-section distortion decreases with the increase of modulus of elasticity and hardening index, or the decrease of strength coefficient and thickness anisotropy index. The reduction rates are 11.76%, 23.67%, 12.07% and 23.51% respectively. Under the fluctuating of material properties, the maximum of the section distortion rate of the high strength TA18 titanium tube is less than 4.00%, and the section distortion rate is negative near the bending plane. The sensitivity of the section distortion rate to the material performance parameters is in order of strength Coefficient, Elastic Modulus, Hardening Index and Tensile Anisotropy Index.