The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Statistical and finite element analysis of the effects of random input parameters on the mechanical characteristics of sheetmetal forming processes using quadrature method
Author:	Quan, Yu
View Online:	njit-etd1995-107 (xi, 84 pages ~ 2.7 MB pdf)
Department:	Manufacturing Engineering Division
Degree:	Master of Science
Program:	Manufacturing Systems Engineering
Document Type:	Thesis
Advisory Committee:	Levy, Nouri (Committee chair) Billatos, Samir B. (Committee member) Chen, Rong-Yaw (Committee member)
Date:	1995-01
Keywords:	Sheet-metal--Mechanical properties. Sheet-metal work. Finite element method.
Availability:	Unrestricted
Abstract:	In this thesis, the computer aided finite element analysis is implemented in the analysis of sheetmetal forming process. To rationalize the experimentation and analysis, the statistical method is introduced to study the variability of sheetmetal deformation process and final shape with respect to the variation of different parameters. In Chapter 2, the basic characteristics and considerations of deep drawing operation is described with emphasis on the study of geometrical and physical variables of the forming process. Chapter 3 discussed the three phases which are encountered in the computer aided finite element analysis. As a typical representative of professional finite element software packages, ABAQUS is used through this work as the main programming environment and its language characteristics and programming techniques are investigated in great detail. As an example of its application, the modeling and analysis of a deep drawing part is specified. Chapter 4 delved with the application of statistical approaches in the experimentation of sheetmetal foaming. A comparison of different traditional methods for statistical analysis is given among which the Taguchi's method is discussed in detail because of its simplicity, practicality and relatively high accuracy. However, on the basis of analysis of its theory, it is found that the degree of central moment it can approximate accurately is too limited. Therefore, a new method for analysis of complex system - the quadrature method is introduced which can obtain the highest possible degree of accurate central moment of a distribution. Finally, by using the quadrature approach, the maximum stresses and reaction forces occurred during the deep drawing process is studies with respect to the change of three geometrical and interface parameters. The results of the experimentation proved the validity and applicability of this method.