PPREDICTION OF FREE BOUNDARY IN SOLIDIFICATION ANALYSIS BASED ON INTEGRAL PENALTY METHOD AND ALE CONTROL

基于积分罚值法和啤酒控制的凝固分析自由边界预测

基本信息

批准号：
09650100
负责人：
IMATANI Shoji
金额：
$ 2.05万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650100/
关键词：
Welding Solidification Numerical Analysis Integral Penalty Method Stefan Problem Finite Element Method

项目摘要

In order to describe the phase change in metals, particularly welding and solidification, the following investigations are carried out ; 1. Fundamental study of numerical analysis in free boundary problem, 2. Development of numerical code based on so-called "Integral Penalty Method, " and 3. Mechanical properties of phase boundary and heat affected zone in welding process in metals.1. Fundamental study of numerical analysis in free boundary problem Regarding the welding and solidification processes as the Stefan problem, the governing equations are formulated in terms of spatial description as well as material description. The Stefan condition at the free surface boundary is replaced by the integral form by use of the integral penalty method, and so this method is advantageous for real utilization in numerical analysis.2. Development of numerical code based on the integral penalty method A finite element code for predicting the Stefan problem is developed with reference to the integral … More penalty method. Numerical studies are carried out to clarify the stability condition between the penalty number, the spatial step, and the time increment. A two-phase/two-dimensional problem is also calculated to demonstrate the applicability of the proposed method.3. Mechanical properties of phase boundary and heat affected zone A one point weld processing is performed on a circular plate of SUs304 stainless steel, and the temperature history is evaluated through the process. Both the hardness and the microstructure change remarkably at the phase boundary, particularly at the heat affected zone where the temperature comes across the AC1 transformation point, and so the phase boundary can be identified from these tests. A welding process is performed for an aluminum plate, from which a small size specimen is prepared for a tension test. Microgrid indentation is used to measure the local deformation over the weld. The strain distribution is calculated from the displacement of the movement of the grids. Less

为了描述金属的相变，尤其是焊接和固化，进行了以下研究； 1。自由边界问题中数值分析的基本研究，2。基于所谓的“积分惩罚方法”的数值代码的开发，以及3。在金属中焊接过程中相边界和热影响区的机械性能1。关于焊接和固化过程作为Stefan问题的自由边界问题中数值分析的基本研究，理事方程是根据空间描述以及材料描述来制定的。自由表面边界处的Stefan条件通过使用积分惩罚方法代替了积分形式，因此该方法对于数值分析中的实际利用是有利的。2。基于积分惩罚方法的数值代码的开发一个有限元代码预测Stefan问题是根据积分不可分割的……更多的惩罚方法开发的。进行数值研究以阐明惩罚数量，空间步骤和时间增加之间的稳定条件。还计算了二维/二维问题，以证明该方法的适用性3。相边界和热影响区的机械性能在SUS304不锈钢的圆板上进行一点点焊接处理，并通过过程评估温度病史。硬度和微观结构在相边界处发生了明显变化，尤其是在温度越过AC1转换点的热影响区域，因此可以从这些测试中识别出相边界。为铝板进行了焊接过程，从该铝板进行焊接，从中准备小型标本以进行张力测试。微电网压痕用于测量焊缝上的局部变形。应变分布是根据网格运动的位移计算得出的。较少的