Superplastic Forming and Diffusion Bonding of Titanium Alloys
Date Issued
2004
Date
2004
Author(s)
Tseng, Ping-Wei
DOI
zh-TW
Abstract
Superplastic forming is a modern industrial manufacturing technology，which can form complicated products. Diffusion bonding is a kind of solid bonding methods，and the bonding strength could be as strong as source materials. Since the forming conditions of these two forming processes are similar，they can be proceeded in the same time，that is what so called “Superplastic and Diffusion bonding technology(SPF/DB)” .
In this research，we created three-dimensional finite element models to analyze SPF/DB forming process by using commercial finite element analysis software ABAQUS. The report is divided into two main parts：The first part is the simulation and analysis of superplastic blow forming process，including the verification of analysis results. Since traditional superplastic forming methods，such as “constant pressure” or “constant strain rate” control methods are not so efficient，we applied “constant flow localization factor” method to control the value of flow localization factor as a constant. Hence，the producing efficiency can be improved enormously.
In the second part，we discuss the existence of grooves which occurred on diffusion bonding products. The solution is to change the thickness of outer sheet，and we can find out the initial thickness of outer sheet by finite element analysis.
Subjects
中空結構
有限元素分析
超塑性成形
局部流集中因子
破壞判準
擴散接合
SPF
SPF/DB
flow localization factor
finite element analysis
fracture criterion
DB
diffusion bonding
hollow structure
superplastic forming
Type
thesis
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