Numerical Simulation of the Temperature and Stress Field Evolution Applied to the Field Assisted Sintering Technique
Numerical Simulation of the Temperature and Stress Field Evolution Applied to the Field Assisted Sintering Technique
复制标题
场辅助烧结技术中温度场和应力场演化的数值模拟
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
C. Walter
中科院分区：
文献类型：
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作者：
J. Allen;C. Walter
场辅助烧结技术（FAST）是一种采用脉冲直流电和单轴压力的高电流、低电压粉末固结技术。在过去的几年中，FAST已成功用于生产各种不同的材料，包括金属，复合材料和陶瓷。在本文中，我们提出了一个瞬态有限元模型的氧化铝烧结，结合耦合的电，热和机械分析，非常类似的物理实验中使用的程序。在此背景下，我们概述的控制方程，属于一个平衡的能量方程，包括热和电接触力，辐射和焦耳加热的影响。我们将其与有关的方程机械位移和规定必要的初始和边界条件的完整的解决方案。作为我们的瞬态分析的一部分，我们还提出了我们的实施比例积分微分控制器，它（类似于实际的实验条件）提供了一个预定的加热速率条件下的可变电压的使用。最后，我们讨论了温度场和应力场的影响，并提出了可能的改进途径。
The field assisted sintering technique (FAST) is a high-amperage, low-voltage, powder consolidation technique that employs pulsed direct current and uniaxial pressure. Over the past several years, FAST has been successfully used to produce a variety of different materials including metals, composites, and ceramics. In this paper we present a transient finite element model of aluminum oxide sintering that incorporates a coupled electrical, thermal, and mechanical analysis that closely resembles the procedures used in physical experiments. Within this context, we outline the governing equations that pertain to a balanced energy equation and include the effects of thermal and electrical contact forces, radiation, and Joule heating. We couple this with the relevant equations pertaining to mechanical displacements and prescribe the necessary initial and boundary conditions for a complete solution. As part of our transient analysis, we also present our implementation of a proportional integral derivative controller, which (similar to actual experimental conditions) affords the use of a predetermined heating rate conditioned upon a variable voltage. Finally, we discuss implications relating to the temperature and stress fields and suggest possible avenues for improvement.