Measurement and Prediction of Machining Induced Redistribution of Residual Stress in the Aluminium Alloy 7449
Measurement and Prediction of Machining Induced Redistribution of Residual Stress in the Aluminium Alloy 7449
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DOI：
10.1007/s11340-010-9389-4
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发表时间：
2011-07
影响因子：
2.4
通讯作者：
J. Robinson;D. Tanner;C. Truman;R. Wimpory
中科院分区：
文献类型：
--
作者：
J. Robinson;D. Tanner;C. Truman;R. Wimpory
使用中子衍射确定了两个 7449 铝合金直线块中的残余应力分布。热处理包括冷水浸泡淬火和一段时间的沉淀硬化。淬火在两个块体中产生了非常高的残余应力。在这种条件下测量一个块，同时通过铣削将另一个块增量加工至一半厚度。在铣削的半厚度块上与未加工的块相同的位置处进行中子衍射测量。这使得可以对两个块的厚度测量进行比较，揭示加工引起的残余应力的重新分布。在加工面的中心留下一个方形横截面柱作为无应力参考样品。使用坐标测量机测量与铣削面相反的面上出现的变形。将块体中产生的残余应力和变形与有限元分析预测进行比较，发现总体一致。材料去除只会导致变形和残余应力重新分布；没有明显的应力松弛。
The residual stress distributions in two 7449 aluminium alloy rectilinear blocks have been determined using neutron diffraction. Heat treatment included cold water immersion quenching and a period of precipitation hardening. Quenching induced very high magnitude residual stresses into the two blocks. One block was measured in this condition while the other was incrementally machined by milling to half thickness. Neutron diffraction measurements were made on the milled half thickness block at equivalent locations to the unmachined block. This permitted through thickness measurements from both blocks to be compared, revealing the redistribution of residual stresses induced by machining. A square cross section post in the centre of the machined face was left to act as a stress free reference sample. The distortions arising on the face opposite to that being milled were measured using a co-ordinate measuring machine. The residual stresses and distortion arising in the blocks have been compared to finite element analysis prediction and found to generally agree. Material removal only caused distortion and the residual stresses to redistribute; there was no stress relaxation evident.