Predeleanu Computational Methods for Predicting Material Processing Defects

Proceedings of the International Conference on Computational Methods for Predicting Material Processing Defects, September 8-11, 1987, Cachan, France
1. Auflage 2014
ISBN: 978-1-4832-9849-8
Verlag: Elsevier Science & Techn.
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, Band Volume 15, 372 Seiten, Web PDF

Reihe: Studies in Applied Mechanics

The papers in this book deal with computational methods for predicting material processing defects. Using recent advances in finite strain plasticity and viscoplasticity, damage modelling, bifurcation and instability theory, fracture mechanics and computer numerical techniques, new approaches to mechanical defect analysis are proposed. Appropriate methods for explaining and avoiding the defects leading to fracture, high porosity, strain localization or undesirable geometrical imperfections are presented. In addition, some papers are devoted to new formulations and new calculation algorithms to be used for solving the forming problems. Finally, two papers deal with physical description of defects occurring in forming and cutting operations, focusing on the academic and practical interest of these topics.This is the first book to deal with the prediction of defects occurring in material forming processes; it contains much of interest from both a theoretical and a practical viewpoint.

Autoren/Hrsg.

Predeleanu, M.

Inhaltsverzeichnis

1;Front Cover;1
2;Computational Methods for Predicting Material Processing Defects;4
3;Copyright Page;5
4;Table of Contents;8
5;PREFACE;6
6;CHAPTER 1. NUMERICAL SIMULATIONS OF DYNAMICAL METAL FORMING;10
6.1;SUMMARY;10
6.2;NOTATIONS;10
6.3;PRINCIPLES OF THE SYSTEM;10
6.4;APPLICATIONS;15
6.5;REFERENCES;17
7;CHAPTER 2. NUMERICAL COMPUTING TECHNIQUE FOR PREDICTING THICKNESS CHANGING IN DEEPDRAWING OF AUTOBODY SHEET;18
7.1;SUMMARY;18
7.2;INTRODUCTION;18
7.3;BASIC THEORY;18
7.4;RESULTS;25
7.5;CONCLUSION;27
7.6;REFERENCES;27
8;CHAPTER 3. AN EULERIAN FINITE ELEMENT METHOD FOR THE THERMAL AND VISCO PLASTIC DEFORMATIONOF METALS IN INDUSTRIAL HOT ROLLING;28
8.1;SUMMARY;28
8.2;INTRODUCTION;28
8.3;THERMAL PROBLEM;29
8.4;FINITE ELEMENT FORMULATIONS;30
8.5;RESULTS AND DISCUSSION;31
8.6;CONCLUSIONS;32
8.7;REFERENCES;33
9;CHAPTER 4. SURFACE DEFECTS IN HOT ROLLING OF COPPER BASED ALLOYS HEAVY INGOTS: THREE DIMENSIONAL SIMULATION INCLUDING FAILURE CRITERION;38
9.1;SUMMARY;38
9.2;INTRODUCTION;38
9.3;PRESENTATION OF THREE DIMENSIONAL ROLLING PROGRAM;38
9.4;APPLICATION TO COPPER BASED INGOTS;40
9.5;DISCUSSION OF FAILURE RISK PREDICTION;42
9.6;CONCLUSION;47
9.7;REFERENCES;47
10;CHAPTER 5. ANALYSIS OF THE PROFILE OF LOCAL NECKING IN SHEET METAL DEFORMATIONPROCESSES;48
10.1;SUMMARY;48
10.2;INTRODUCTION;48
10.3;THEORETICAL ANALYSIS;49
10.4;RESULTS AND DISCUSSION;51
10.5;ACKNOWLEDGEMENTS;52
10.6;REFERENCES;55
11;CHAPTER 6. A FINITE ELEMENT ANALYSIS OF SPRINGBACK IN PLANE STRAIN FOLDING WITH BINDERS OFHIGH STRENGTH STEEL SHEETS;56
11.1;SUMMARY;56
11.2;INTRODUCTION;56
11.3;GOVERNING EQUATIONS;57
11.4;BOUNDARY CONDITIONS;58
11.5;FINITE ELEMENT APPROXIMATION;59
11.6;SOLUTION PROCEDURE;60
11.7;NUMERICAL RESULTS;61
11.8;CONCLUSION;64
11.9;REFERENCES;64
12;CHAPTER 7. PREVISION DES DEFAUTS DE GEOMETRIE AU COURS DU LAMINAGE A CHAUD DES ACIERS;66
12.1;RESUME;66
12.2;INTRODUCTION;66
12.3;LOI CONSTITUTIVE DES ACIERS DE LAMINAGE;66
12.4;MODELISATION DU SOLIDE;67
12.5;MODELISATION DU CONTACT;72
12.6;DEFAUTS DE GEOMETRIE AU COURS DU LAMINAGE;73
12.7;REFERENCES;74
13;CHAPTER 8. INFLUENCE OF STRAIN GRADIENTS IN SHEET METAL FORMING;78
13.1;1. INTRODUCTION;78
13.2;2. NECKING CRITERIA;78
13.3;3. INFLUENCE OF STRAIN GRADIENTS;80
13.4;4. EXPERIMENTAL STUDY;81
13.5;5. CONCLUSION;82
13.6;REFERENCES;82
14;CHAPTER 9. SURFACE DEFECTS AND FAILURE OF ADHESION IN POLYMER MELT EXTRUSION;86
14.1;SUMMARY;86
14.2;INTRODUCTION;86
14.3;NUMERICAL COMPUTATION;88
14.4;CONCLUSION;88
14.5;ACKNOWLEDGMENTS;89
14.6;REFERENCES;89
15;CHAPTER 10. LARGE STRAIN FORMULATION OF ANISOTROPIC ELASTO-PLASTICITY FOR METAL FORMING;90
15.1;SUMMARY;90
15.2;1. INTRODUCTION;90
15.3;2. THE ISOTROPIC CASE;91
15.4;3. ANISOTROPIC RIGID PLASTICITY;94
15.5;4. ANISOTROPIC ELASTO-PLASTICITY;98
15.6;5. CONCLUSION;100
15.7;REFERENCES;100
16;CHAPTER 11. DRAWING OF VISCOPLASTIC TUBES THROUGH ROTATING CONICAL DIES;102
16.1;SUMMARY;102
16.2;1. INTRODUCTION;102
16.3;2. FORMULATION OF THE PROBLEM;104
16.4;3. SOLUTIONS FOR THE NEWTONIAN FLUID;106
16.5;4. APPROXIMATE SOLUTION FOR THE POWER LAW VISCOUS SOLID;107
16.6;ACKNOWLEDGEMENT;111
16.7;REFERENCES;111
17;CHAPTER 12. INFLUENCE OF THE BLANK CONTOUR ON THE THICKNESS VARIATION IN SHEET METAL FORMING;112
17.1;SUMMARY;112
17.2;INTRODUCTION;112
17.3;FINITE ELEMENT FORMULATION;113
17.4;NUMERICAL APPLICATIONS;116
17.5;REFERENCES;118
18;CHAPTER 13. CHARACTERIZATION AND MODELING OF SPREAD IN ROLLING ANISOTROPICSTRIP;122
18.1;SUMMARY;122
18.2;NOMENCLATURE;122
18.3;NOMENCLATURE;122
18.4;INTRODUCTION;122
18.5;EXPERIMENTAL;123
18.6;RESULTS AND DISCUSSION;124
18.7;DEVELOPMENT OF SPREAD MODEL;128
18.8;CONCLUSIONS;129
18.9;ACKNOWLEDGEMENTS;129
18.10;REFERENCES;129
19;CHAPTER 14. NUMERICAL ANALYSES OF STRAIN RATE AND TEMPERATURE EFFECTS ON LOCALIZATION OFPLASTIC FLOW AND DUCTILE FRACTURE - APPLICATIONS TO METAL FORMING PROCESSES;132
19.1;ABSTRACT;132
19.2;INTRODUCTION;132
19.3;CONSTITUTIVE EQUATIONS;133
19.4;ANALYSIS OF PLASTIC FLOW LOCALIZATION;136
19.5;REFERENCES;141
20;CHAPTER 15. SOME PHYSICAL DEFECTS ARISING IN LASER, PLASMA AND WATER JET CUTTING;142
20.1;SUMMARY;142
20.2;INTRODUCTION;142
20.3;LASER PROCESSING;143
20.4;PLASMA PROCESSING;148
20.5;WATER JET CUTTING;151
20.6;CONCLUSIONS;155
20.7;REFERENCES;155
21;CHAPTER 16. THEORETICAL PREDICTION OF THE LIMIT CURVES FOR SIMULATION OFPLASTIC INSTABILITY;170
21.1;SUMMARY;170
21.2;INTRODUCTION;170
21.3;THEORETICAL ANALYSIS OF THE FORMING LIMIT DIAGRAMS;171
21.4;EXPERIMENTAL METHODS AND MATERIALS;173
21.5;RESULTS AND DISCUSSION;175
21.6;CONCLUSIONS;178
21.7;ACKNOWLEDGEMENTS;179
21.8;REFERENCES;179
22;CHAPTER 17. HOMOGENIZATION OF A PLASTIC POROUS MEDIA. INFLUENCE OF SECONDARYCAVITIES;180
22.1;SUMMARY;180
22.2;INTRODUCTION;180
22.3;STATEMENT OF THE PROBLEM;181
22.4;NUMERICAL RESULTS;183
22.5;DISCUSSION;186
22.6;REFERENCES;188
23;CHAPTER 18. A NOTE ON ADIABATIC FLOW LOCALIZATION IN VISCOPLASTIC SOLIDS;190
23.1;SUMMARY;190
23.2;INTRODUCTION;190
23.3;LOCALIZATION CRITERION;192
23.4;NUMERICAL EXAMPLE;194
23.5;DISCUSSION AND CONCLUSIONS;196
23.6;ACKNOWLEDGEMENTS.;197
23.7;REFERENCES;197
24;CHAPTER 19. A COMPUTATIONAL METHOD TO ESTIMATE THE FORMABILITY OF COLD FORGING STEELS;202
24.1;SUMMARY;202
24.2;INTRODUCTION;202
24.3;EXPERIMENTAL MATERIALS AND PROCEDURES;203
24.4;DISCUSSION;209
24.5;CONCLUSIONS;210
24.6;REFERENCES;210
25;CHAPTER 20. STRESSES AND DISLOCATION DENSITY DURING GROWTH OF SINGLE III-VSEMICONDUCTOR CRYSTALS FROM THE MELT;212
25.1;SUMMARY;212
25.2;INTRODUCTION;212
25.3;TEMPERATURE DISTRIBUTION;213
25.4;RESULTS;218
25.5;DISCUSSION;221
25.6;REFERENCES;221
26;CHAPTER 21. NUMERICAL ANALYSIS OF THE INFLUENCE OF VARIOUS DEFECTS ON SUPERPLASTIC FRACTUREUNDER UNIAXIAL TENSION;222
26.1;SUMMARY;222
26.2;I. INTRODUCTION;222
26.3;II. ANALYSIS;223
26.4;Ill RESULTS AND DISCUSSION;225
26.5;IV CONCLUSION;229
26.6;REFERENCES;229
27;CHAPTER 22. Finite Element Simulation of Bending Process of Steel-Plastic Laminate Sheets;230
27.1;SUMMARY;230
27.2;INTRODUCTION;230
27.3;FINITE ELEMENT MODELING;232
27.4;EXPERIMENT;235
27.5;RESULTS;236
27.6;CONCLUSIONS;237
27.7;ACKNOWLEDGEMENT;238
27.8;REFERENCES;238
28;CHAPTER 23. DEFECTS IN THE PROCESSING OF METALS AND COMPOSITES;240
28.1;SUMMARY;240
28.2;INTRODUCTION;240
28.3;PROCESSING OF COMPOSITE MATERIALS;254
28.4;CONCLUDING REMARKS;257
28.5;ACKNOWLEDGEMENTS;258
28.6;REFERENCES;258
29;CHAPTER 24. Damage Evolution Modeling in Bulk Forming Processes;260
29.1;Abstract;260
29.2;Notation;260
29.3;Introduction;260
29.4;A Metal Forming Model with Damage;261
29.5;Numerical Solution of the Model Equations;264
29.6;Application to Strip Drawing;266
29.7;Effect of Geometry Changes on Material Damage;268
29.8;Conclusions;268
29.9;Acknowledgements;268
29.10;REFERENCES;269
30;CHAPTER 25. PREDICTION OF THE WRINKLING INSTABILITIES BY LONG WAVELENGTH PERTURBATIONS INTHIN SHEET METAL FORMING;272
30.1;SUMMARY;272
30.2;INTRODUCTION;272
30.3;EQUATIONS OF EQUILIBRIUM;275
30.4;CRITERION OF STABILITY IN CASE OF WRINKLING PERTURBATIONS;278
30.5;APPLICATIONS OF THE STABILITY CRITERION;282
30.6;REFERENCES;283
31;CHAPTER 26. CRITICAL DAMAGE AND DUCTILE FRACTURE : QUANTITATIVE EXPERIMENTAL DETERMINATION;284
31.1;SUMMARY;284
31.2;INTRODUCTION;284
31.3;MECHANICAL AND PHYSICAL DESCRIPTION OF FRACTURE PROCESSES;285
31.4;EXPERIMENTAL PROCEDURE;289
31.5;RESULTS AND DISCUSSION;291
31.6;CONCLUSIONS;296
31.7;ACKNOWLEDGEMENTS;297
31.8;REFERENCES;297
32;CHAPTER 27. METHOD OF CALCULATION OF CURVE OF DEFORMABILITY OF K18 STEEL;298
32.1;SUMMARY;298
32.2;CURVE OF DEFORMABILITY;298
32.3;EXPERIMENTAL RESULTS;300
32.4;CONCLUSIONS;301
32.5;REFERENCES;302
33;CHAPTER 28. FINITE STRAIN PLASTICITY ANALYSIS OF DAMAGE EFFECTS IN METALFORMING PROCESSES;304
33.1;Summary;304
33.2;INTRODUCTION;304
33.3;MODELLING OF DAMAGE EFFECTS;306
33.4;CONSTITUTIVE BRANCHING;311
33.5;APPLICATIONS;312
33.6;REFERENCES;313
34;CHAPTER 29. PLASTIC INSTABILITY OF PRESTRAINED MATERIALS;318
34.1;SUMMARY;318
34.2;INTRODUCTION;318
34.3;FORMING LIMIT DIAGRAMS;319
34.4;MICROSTRUCTURAL APPROACH OF PLASTIC BEHAVIOR OF PRESTRAINED METALS;322
34.5;CONCLUSION;326
34.6;ACKNOWLEDGEMENTS;326
34.7;REFERENCES;326
35;CHAPTER 30. TAKING INTO ACCOUNT THE FORGING PROCESS IN COMPUTER AIDED DESIGN TO INCREASETHE LIFE OF THE DIES;328
35.1;ABSTRACT;328
35.2;INTRODUCTION;328
35.3;OPTIMIZED FORGING DESIGN FEATURES;328
35.4;GIVING A COST FOR A PART;335
35.5;REFERENCES;338
36;CHAPTER 31. DAMAGE ARREST BY CLOSURE OF VOIDS IN DILATANT SOLIDS SUBJECTED TO COMPRESSIVELOAD;340
36.1;SUMMARY;340
36.2;INTRODUCTION;340
36.3;CONSTITUTIVE EQUATION;341
36.4;RESULTS AND DISCUSSION;344
36.5;REFERENCES;345
37;CHAPTER 32. TEMPERATURE DISTRIBUTION IN STRIP ROLLING OF RATE SENSITIVE MATERIAL;352
37.1;SUMMARY;352
37.2;INTRODUCTION;352
37.3;MATHEMATICAL ANALYSIS;353
37.4;CONCLUDING REMARKS;354
37.5;REFERENCES;355
38;CHAPTER 33. DAMAGE DURING FORMING OF COATED SHEET STEEL;356
38.1;SUMMARY;356
38.2;INTRODUCTION;356
38.3;RESULTS AND DISCUSSION;357
38.4;CONCLUSION;364
38.5;REFERENCES;365
39;CHAPTER 34. DEFECTS AT INTERFACES IN CO-EXTRUDED METALS;366
39.1;SUMMARY;366
39.2;INTRODUCTION;366
39.3;THEORETICAL BACKGROUND;367
39.4;INTERFACIAL STRENGTH EVALUATION;368
39.5;EXPERIMENTAL PROCEDURES;369
39.6;INTERFACIAL STRENGTH MEASUREMENTS;371
39.7;FINITE ELEMENT SIMULATION;372
39.8;DISCUSSION AND CONCLUSIONS;374
39.9;ACKNOWLEDGMENTS;375
39.10;REFERENCES;375