A model to characterize acoustic softening during ultrasonic consolidation
A model to characterize acoustic softening during ultrasonic consolidation
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DOI：
10.1016/j.jmatprotec.2013.05.008
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发表时间：
2013-11
影响因子：
6.3
通讯作者：
G. Kelly;S. Advani;J. Gillespie;T. Bogetti
中科院分区：
文献类型：
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作者：
G. Kelly;S. Advani;J. Gillespie;T. Bogetti
超声固结（UC）是一种固态键合工艺，其中薄金属箔在超声振动和压力的影响下被键合。大型零件可以通过将箔并排放置或通过堆叠层来创建更厚的零件来制造。UC过程中金属的热和声软化导致塑性变形增加，并在键合形成中起重要作用。在这项工作中，开发了一个热-机械有限元模型，以量化的程度发生在铝1100-0箔在UC的热和声学软化。该模型使用实验测量的温度和在UC期间箔的几何形状的变化来量化热和声学软化的量。声学软化被证明可以降低Al 1100-0箔的屈服应力高达82%。此外，发现热软化相对较小，通常小于总材料软化的5%。这种量化UC过程中声学软化的方法可以更好地全面了解键合过程，并允许优化和改进UC键合过程的几个方面。
Ultrasonic consolidation (UC) is a solid state bonding process in which thin metal foils are bonded under the influence of ultrasonic vibration and pressure. Large parts can be made by placing foils side by side or by stacking layers to create thicker parts. Thermal and acoustic softening of metals during UC leads to increased plastic deformation and plays an important role in bond formation. In this work, a thermo-mechanical finite element model is developed to quantify the degree of thermal and acoustic softening occurring in Al 1100-0 foils during UC. The model uses experimentally measured temperatures and changes in the foil's geometry during UC to quantify the amount of thermal and acoustic softening. Acoustic softening is shown to reduce the yield stress of Al 1100-0 foils by up to 82%. In addition, thermal softening is found to be relatively minor, typically less than 5% of the total material softening. This method to quantify acoustic softening during UC allows for a better overall understanding of the bonding process and allows several aspects of the UC bonding process to be optimized and improved.