Ti-6Al-4V惯性摩擦焊缝变形导数的研究

R. Turner, N. Warnken, J. Brooks
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引用次数: 0

摘要

对两个实验性Ti-6Al-4V惯性摩擦焊缝的速度-时间衰减曲线进行了多次分析和微分,以产生每个焊缝的旋转加速度、急动、颠簸(或断裂)、裂纹和爆裂与时间的关系曲线。众所周知,钛合金及其机械性能对材料变形时的应变速率高度敏感,尽管从未考虑过位置的高阶时间导数。对这些曲线进行了进一步的研究和分析,以更全面地了解导数趋势。当零件在飞轮的作用下旋转时,旋转加速度和急动轨迹都会在两个焊缝上显示行为模式。在最后大约0.5秒的焊接过程中,随着能量的耗散,旋转捕捉也显示出该导数中的模式。当在较大的时基上进行区分时,注意到一个焊缝的旋转裂纹和爆裂项存在明显的振荡模式的证据,尽管在第二个焊缝中无法复制。较高的导数曲线允许区分不同的过程状态,表明惯性能量主要影响动态稳态阶段的时基。在高阶导数中,初始能量之间的定性差异是明显的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study of the Deformation Derivatives for a Ti-6Al-4V Inertia Friction Weld
The velocity–versus-time rundown curves from two experimental Ti-6Al-4V inertia friction welds were analysed and differentiated several times, to produce rotational acceleration, jerk, jounce (or snap), crackle and pop versus-times curves for each weld. Titanium alloys and their mechanical properties are known to be highly sensitive to strain rate as the material is deformed, though nothing has ever been considered in terms of the higher-order time-derivatives of position. These curves have been studied and analysed further, for a more complete understanding of the derivative trends. Rotational acceleration and jerk traces both display behavior patterns across the two welds as the part rotates under action from the flywheel. The rotational snap also displays a pattern in this derivative during the final approximately 0.5 s of welding, as the energy dissipates. Evidence of a distinct oscillatory pattern in the rotational crackle and pop terms was noted for one weld when differentiating over a larger time-base, though could not be replicated in the 2nd weld. The higher derivative curves allow distinction of different process regimes, indicating that inertial energy mostly influences the time-base of dynamically steady-state phase. Qualitative differences between initial energies are evident in higher derivatives.
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