Flow Analysis of Injection Molds

✍ Scribed by Peter Kennedy, Rong Zheng

• Publisher: Hanser
• Year: 2013
• Tongue: English
• Leaves: 372
• Edition: 2
• Category: Library

✦ Synopsis

Given the importance of injection molding as a process as well as the simulation industry that supports it, there was a need for a book that deals solely with the modeling and simulation of injection molding. This book meets that need. The modeling and simulation details of filling, packing, residual stress, shrinkage, and warpage of amorphous, semi-crystalline, and fiber-filled materials are described. This book is essential for simulation software users, as well as for graduate students and researchers who are interested in enhancing simulation. And for the specialist, numerous appendices provide detailed information on the topics discussed in the chapters.

✦ Table of Contents

9781569905227%2Efm......Page 1
I The Current Status of Simulation......Page 31
1 Introduction......Page 33
1.4.1 Basic Physics of the Process......Page 36
2 Stress and Strain in Fluid Mechanics......Page 40
3 Material Properties of Polymers......Page 47
3.2 Amorphous Polymers......Page 48
3.5 Viscosity......Page 50
3.6 Modeling Viscosity......Page 51
3.9 Pressure-Volume-Temperature (PVT) Data......Page 59
4 Governing Equations......Page 62
4.7.1 Fiber Concentration......Page 77
5 Approximations for Injection Molding......Page 81
5.10.1 Conservation of Mass for Runners......Page 118
6 Numerical Methods for Solution......Page 124
6.1.4 Warpage Analysis Using the Dual Domain FEM......Page 132
II Improving Molding Simulation......Page 136
7 Improved Fiber Orientation Modeling......Page 138
7.2.2 Direct Simulation......Page 141
7.2.3 Calculation of CI......Page 142
8 Improved Mechanical Property Modeling......Page 148
8.2 Unidirectional Composites......Page 149
8.3 Fiber Orientation Averaging......Page 155
9 Long Fiber-Filled Materials......Page 156
9.5.2 Continuum Modeling......Page 164
10 Crystallization......Page 166
11 Effects of Crystallization on Rheology and Thermal Properties......Page 179
12 Colorant Effects......Page 191
13 Prediction of Post-Molding Shrinkage and Warpage......Page 199
14 Additional Issues of Injection-Molding Simulation......Page 204
15 Epilogue......Page 223
Appendices......Page 225
A History of Injection-Molding Simulation......Page 227
B Tensor Notation......Page 249
B.7 Transformation of Principal Axes......Page 253
C Derivation of Fiber Evolution Equations......Page 257
D Dimensional Analysis of Governing Equations......Page 265
E The Finite Difference Method......Page 275
F The Finite Element Method......Page 283
F.3 The Nature of a Finite Element Solution......Page 287
F.4 Shape Functions......Page 289
F.7 A One-Dimensional Problem Solved Using the FEM......Page 295
F.7.4 Application of Boundary Conditions......Page 302
G Numerical Methods for the 2.5D Approximation......Page 305
H Three-Dimensional FEM for Mold Filling Analysis......Page 325
H.3 Finite Element Matrix Formulations......Page 327
I Level Set Method......Page 335
J Full Form of Mori-Tanaka Model......Page 339
J.2 Expanded Mori-Tanaka Equation......Page 341
Bibliography......Page 343
Index......Page 367

✦ Subjects

Металлургия и обработка металлов;Литейное производство;Литейная оснастка;