Rezvan Abedini, Vahid Fartashvand, Amir Abdullah, Yunes Alizadeh
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引用次数: 0
摘要
超声技术已广泛应用于许多行业，如开发先进材料、改善材料性能和提高机械强度等。本研究旨在通过高功率超声加速 Ti-6Al-4 V 粉末热压过程中的致密化机制。我们开发并实施了一项计算研究来模拟固结行为，然后与实验数据进行比较，以确保模拟的准确性。包括热塑性和幂律蠕变模型在内的构成方程以 UMAT 和 CREEP 子程序的形式在模拟中实现。最后，将致密化曲线和密度分布的模拟结果与实验测试结果进行了比较。模拟结果和实验结果的对比显示，在预测不使用超声波和使用超声波的热压工艺的致密化行为时，最大误差分别为 6.8%和 2.8%。结果表明，模拟在预测超声波振动的最终相对密度和密度分布方面具有良好的准确性。
Finite element modelling of ultrasonic assisted hot pressing of metal powder
Ultrasonication has widely been used in many industries to develop advanced materials, improve materials behaviors, and enhance mechanical strength to name a few. The present investigation aims to accelerate the densification mechanisms during the hot-pressing process of Ti-6Al-4 V powder through high power ultrasonication. A computational study has been developed and implemented to simulate the consolidation behavior, then compared with the experimental data to ensure the simulation accuracy. The constitutive equations, encompassing thermoplastic and power-law creep models, were implemented in the simulation as UMAT and CREEP subroutines. Finally, the simulation results in densification curves and density distribution have been compared with the results of experimental tests. The comparison of the simulation and experimental results shows a maximum error of 6.8 and 2.8% in predicting the densification behavior of hot pressing without and with ultrasonication, respectively. The results show the good accuracy of the simulation in predicting final relative density and density distribution with ultrasonic vibrations.
期刊介绍：
Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties.
The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.
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