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Formability of Metallic Materials : Plastic Anisotropy, Formability Testing, Forming Limits :  Plastic Anisotropy, Formability Testing, Forming Limits - H-.J. Bunge

Formability of Metallic Materials : Plastic Anisotropy, Formability Testing, Forming Limits

Plastic Anisotropy, Formability Testing, Forming Limits

Hardcover Published: January 2001
ISBN: 9783540679066
Number Of Pages: 334

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After a brief introduction into crystal plasticity,the fun- damentals of crystallographic textures and plastic anisotro- py, a main topic of this book, are outlined. A large chapter is devoted to formability testing both for bulk metal and sheet metal forming. For the first time testing methods for plastic anisotropy of round bars and tubes are included. A profound survey is given of literature about yield criteria for anisotropic materials up to most recent developments and the calculation of forming limits of anisotropic sheet me- tal. Other chapters are concerned with properties of workpieces after metal forming as well as the fundamentals of the theory of plasticity and finite element simulation of metal forming processes. The book is completed by a collection of tables of international standards for formability testing and of flow curves of metals which are most commonly used in metal forming. It is addressed both to university and industrial readers.

Introduction. Elements of Crystal Plasticityp. 1
Surveyp. 2
Conceptsp. 2
Crystal Structure and Crystal Defectsp. 5
Plastic Deformationp. 9
Gliding of Dislocationsp. 9
Mechanical Twinningp. 14
Sharp Yield Point and Strain Agingp. 14
Recovery and Recrystallizationp. 17
Overviewp. 17
Recoveryp. 18
Recrystallizationp. 19
Changes of Structure during Hot Formingp. 20
References to Chapter 1p. 22
Crystallographic Texture and Plastic Anisotropyp. 23
Structure of Polycrystalline Materialsp. 26
Definition of Crystallographic Texturep. 27
Crystal Orientationp. 28
Experimental Determination of Texturesp. 30
Texture and Properties of Materialsp. 33
Plasticity of Polycrystalline Materialsp. 36
The Taylor Model (Full-Constraints)p. 40
Special Plasticity Parametersp. 47
Plasticity of Cubic Metalsp. 50
Deformation Hardeningp. 51
Plasticity of Macroscopic Bodiesp. 54
Parametrization of the Texture Functionp. 54
Other Modes of Plasticityp. 56
References to Chapter 2p. 57
Formability Testingp. 61
Introductionp. 63
Determination of Flow Curvesp. 63
Tensile Testp. 64
Upsetting Cylindrical Specimensp. 67
Plane Strain Upsetting Testp. 71
Upsetting Test at Elevated Temperaturesp. 75
Torsion Testp. 76
Special Methodsp. 84
Flow Curves of Sheet Metalp. 84
Plastic Anisotropy of Round Bars, Wire and Tubesp. 86
Introductionp. 86
General Terminologyp. 88
Recommended Experimental Proceduresp. 89
Metal Forming Processes and Relevant Parametersp. 93
Transferability of Resultsp. 96
Basic Problemp. 96
Uncertainty of Experimentally Determined Flow Curvesp. 97
Determining Forming Limits in Bulk Metal Formingp. 101
Conceptsp. 101
The Term "Ductility"p. 103
The Forming Limitp. 104
Process Simulating Testing Methodsp. 107
References to Chapter 3p. 108
Anisotropy of Sheet Metalp. 119
Definition of the Anisotropy Coefficientp. 122
Yield Criteria for Isotropic Materialsp. 123
Tresca Yield Criterionp. 125
Huber-Mises-Hencky Yield Criterionp. 127
Drucker Yield Criterionp. 128
Hosford Yield Criterionp. 129
Quadratic Yield Criteriap. 129
Hill 1948 Yield Criterionp. 130
Non-quadratic Yield Criteriap. 135
Hill 1979 Yield Criterionp. 136
Bassani Yield Criterionp. 139
Hosford 1979 Yield Criterionp. 139
Early Yield Criteria by Barlatp. 141
Hill 1990 Yield Criterionp. 144
Hill 1993 Yield Criterionp. 147
Barlat 1991 Yield Criterionp. 150
Karafillis-Boyce Yield Criterionp. 152
The Yield Criteria by Barlat 1994 and 1996p. 157
Other Nonquadratic Yield Criteriap. 160
Yield Criteria Expressed in Polar Coordinatesp. 163
Budiansky Yield Criterionp. 163
Ferron Yield Criterionp. 164
Other Yield Criteriap. 166
Recommentations for the Practicep. 166
References to Chapter 4p. 168
Forming Limits of Sheet Metalp. 173
Introductionp. 173
Methods for Evaluating Sheet Metal Formabilityp. 179
Methods Based on Simulating Testsp. 179
Limit Dome Height Methodp. 187
Methods Based on Mechanical Tests (Intrinsic Methods)p. 188
Forming Limit Diagramp. 189
Definition. Historyp. 189
Main Tests Used to Determine the FLDp. 192
Factors Influencing Forming Limit Diagramsp. 198
Theoretical Models for Calculating Forming Limit Diagramsp. 204
Use of Forming Limits Diagrams in Industrial Practicep. 205
References to Chapter 5p. 209
Workpiece Properties after Metal Formingp. 215
Surveyp. 215
Material Behavior during Machining after Metal Formingp. 216
Material Properties after Homogeneous Deformationp. 217
Strain Distribution in Workpiecesp. 217
Visioplasticity Methodp. 218
Hardness Distributionp. 219
Deformation-Induced Residual Stressesp. 221
Cold Bulk Metal Formingp. 222
Sheet Metal Formingp. 229
Corrosive Behavior of Sheet Metal Componentsp. 230
Surveyp. 230
Austenitic Stainless Steelsp. 231
CuZn Alloysp. 233
Fatigue Behavior of Extruded Componentsp. 235
Introductionp. 235
Ingot Steelsp. 238
P/M Steelsp. 242
Aluminum Alloyp. 244
Concluding Remarksp. 245
References to Chapter 6p. 245
Simulation of Metal Formingp. 251
Introductionp. 252
Elements of Continuum Mechanicsp. 253
Nonlinear Kinematics of Deformationp. 253
Axiom of Objectivityp. 257
Rigid-Plastic Explicit Methodsp. 258
Rigid-Plastic Material Lawp. 259
Markov's Variational Statementp. 260
Discretization: Penalty Factor Approachp. 261
Discretization: Lagrangian Multiplier Approachp. 263
Numerical Solution: Direct Iterative Methodp. 265
Numerical Solution: Newton-(Raphson) Methodp. 268
Static Explicit Solution Schemep. 270
Thermomechanical Analysisp. 274
Elasto-Plastic Implicit Methodsp. 276
Governing Variational Statementp. 276
Stress Updatep. 279
Elasto-Plastic Explicit Methodsp. 282
Introductionp. 282
Finite Element Equation of Motionp. 283
Computational Issuesp. 284
Dynamic Relaxationp. 287
Applicationsp. 287
Introductionp. 287
Element Typesp. 291
Meshing Issuesp. 292
Bulk Forming Applicationsp. 293
Sheet Forming Applicationsp. 296
References to Chapter 7p. 298
Tablesp. 303
Standards for Formability Testingp. 303
Comparative Designations of Materialsp. 306
Mechanical Properties of Selected Steelsp. 307
Conversion Factors of Unitsp. 308
Flow Curves of Common Metalsp. 309
Experimentally Determined Flow Curvesp. 309
Analytical Approximationp. 311
References to Appendix 2p. 314
Theoretical Models of the FLD'sp. 317
Models Based on the Necking Theoryp. 318
Models Based on the Theory of Sheet-Nonhomogeneityp. 320
Linear Perturbation Theoryp. 324
Semiempirical Modelsp. 325
References to Appendix 3p. 326
Indexp. 329
Table of Contents provided by Publisher. All Rights Reserved.

ISBN: 9783540679066
ISBN-10: 3540679065
Series: Engineering Materials
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 334
Published: January 2001
Publisher: Springer-Verlag Berlin and Heidelberg Gmbh & Co. Kg
Country of Publication: DE
Dimensions (cm): 23.5 x 15.5  x 1.27
Weight (kg): 0.76