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Mike Crisfield (deceased), Imperial College, London; René de Borst, Joris Remmers & Clemens Verhoosel, TU Eindhoven, Netherlands
Professor Mike Crisfield (deceased) joined the Transport & Road Research Laboratory (TRRL) in 1971, where he rose to the rank of Deputy Chief Scientific Officer. In 1989 he was appointed as first holder of the FEA Chair in Computational Mechanics in the aeronautics department at Imperial College, London, the department that had pioneered FEA in the 1950s and 1960s. Shortly before he died, a list of the most cited engineering researchers in the UK was published included Mike in the top 20, and he received an IACM Research Achievement Award in recognition of his extraordinary achievements in the field of non-linear computational mechanics. An eminent researcher and a scholar, he was reputed as an innovative thinker who adopted a 'hands-on' approach.
René de Borst was appointed Dean and Distinguished University Professor of the Faculty of Mechanical Engineering of TU Eindhoven in May 2007 after a long tenure as Professor and deputy Dean at TU Delft. He is Editor for the International Journal for Numerical Methods in Engineering and International Journal for Numerical and Analytical Methods in Geomechanics and Editor for the Encyclopedia of Computational Mechanics. His many awards and the outstanding assessment of his work by the scientific community attest to his reputation as a world leading scientist and researcher within the field of computational mechanics.
Joris Remmers is an assistant professor within René de Borst's group at TU Eindhoven.
Clemens Verhoosel is an assistant professor within René de Borst's group at TU Eindhoven.
Basic Concepts and Solution Techniques | p. 21 |
Preliminaries | p. 23 |
A simple example of non-linear behaviour | p. 23 |
A review of concepts from linear algebra | p. 25 |
Vectors and tensors | p. 32 |
Stress and strain tensors | p. 36 |
Elasticity | p. 42 |
The PYFEM finite element library 44 Bibliography | p. 48 |
Non-linear finite element analysis | p. 49 |
Equilibrium and virtual work | p. 49 |
Spatial discretisation by finite elements | p. 51 |
PyFEM: Shape function utilities | p. 55 |
Incremental-iterative analysis | p. 59 |
Load vs displacement control | p. 68 |
PyFEM: A linear finite element code with displacement control 71 Bibliography | p. 80 |
Geometrically non-linear analysis | p. 81 |
Truss elements | p. 82 |
Total Lagrange formulation | p. 85 |
Updated Lagrange formulation | p. 88 |
Corotational formulation | p. 89 |
PyFEM: The shallow truss problem | p. 94 |
Stress and deformation measures in continua | p. 103 |
Geometrically non-linear formulation of continuum elements | p. 109 |
Total and Updated Lagrange formulations | p. 109 |
Corotational formulation | p. 113 |
Linear buckling analysis | p. 117 |
PyFEM: A geometrically non-linear continuum element 119 Bibliography | p. 127 |
Solution techniques in quasi-static analysis | p. 129 |
Line searches 129 2 Contents | |
Path-following or arc-length methods | p. 132 |
PYFEM: Implementation of Riks’ arc-length solver | p. 140 |
Stability and uniqueness in discretised systems | p. 145 |
Stability of a discrete system | p. 145 |
Uniqueness and bifurcation in a discrete system | p. 146 |
Branch switching | p. 150 |
Load stepping and convergence criteria | p. 150 |
Quasi-Newton methods 153 Bibliography | p. 156 |
Solution techniques for non-linear dynamics | p. 157 |
The semi-discrete equations | p. 157 |
Explicit time integration | p. 159 |
PYFEM: Implementation of an explicit solver | p. 162 |
Implicit time integration | p. 167 |
The Newmark family | p. 167 |
The HHT _-method | p. 168 |
Alternative implicit methods for time integration | p. 169 |
Stability and accuracy in the presence of non-linearities | p. 171 |
Energy-conserving algorithms | p. 175 |
Time step size control and element technology 178 Bibliography | p. 179 |
Material Non-linearities | p. 181 |
Damage mechanics | p. 183 |
The concept of damage | p. 183 |
Isotropic elasticity-based damage | p. 185 |
PYFEM: A plane-strain damage model | p. 188 |
Stability, ellipticity, and mesh sensitivity | p. 192 |
Stability, ellipticity, and mesh sensitivity | p. 192 |
Mesh sensitivity | p. 195 |
Cohesive-zone models | p. 198 |
Element technology: Embedded discontinuities | p. 203 |
Complex damage models | p. 211 |
Anisotropic damage models | p. 211 |
Microplane models | p. 212 |
Crack models for concrete and other quasi-brittle materials | p. 214 |
Elasticity-based smeared crack models | p. 214 |
Reinforcement and tension stiffening | p. 219 |
Regularised damage models | p. 223 |
Non-local damage models | p. 223 |
Gradient damage models 224 Bibliography | p. 227 |
Plasticity 231 Contents | p. 3 |
A simple slip model | p. 231 |
Flow theory of plasticity | p. 235 |
Yield function | p. 235 |
Flow rule | p. 240 |
Hardening behaviour | p. 244 |
Integration of the stress-strain relation | p. 250 |
Tangent stiffness operators | p. 261 |
Multi-surface plasticity | p. 264 |
Koiter’s generalisation | p. 264 |
Rankine plasticity for concrete | p. 267 |
Tresca and Mohr-Coulomb plasticity | p. 272 |
Soil plasticity: Cam-clay model | p. 279 |
Coupled damage-plasticity models | p. 282 |
Element technology: volumetric locking 283 Bibliography | p. 289 |
Time-dependent material models | p. 293 |
Linear visco-elasticity | p. 293 |
One-dimensional linear visco-elasticity | p. 293 |
Three-dimensional visco-elasticity | p. 296 |
Algorithmic aspects | p. 297 |
Creep models | p. 299 |
Visco-plasticity | p. 301 |
One-dimensional visco-plasticity | p. 302 |
Integration of the rate equations | p. 303 |
Perzyna visco-plasticity | p. 304 |
Duvaut-Lions visco-plasticity | p. 306 |
Consistency model | p. 308 |
Propagative or dynamic instabilities | p. 310 |
Bibliography | p. 315 |
Structural Elements | p. 317 |
Beams and arches | p. 319 |
A shallow arch | p. 319 |
Kirchhoff formulation | p. 319 |
Including shear deformation: Timoshenko beam | p. 326 |
PYFEM: A Kirchhoff beam element | p. 329 |
Corotational elements | p. 333 |
Kirchhoff theory | p. 333 |
Timoshenko beam theory | p. 337 |
An isoparametric degenerate continuum 2D beam element | p. 339 |
An isoparametric degenerate continuum 3D beam element | p. 344 |
Bibliography | p. 352 |
Plates and shells | p. 355 |
Contents | |
Shallow-shell formulations | p. 356 |
An isoparametric degenerate continuum shell element | p. 363 |
Solid-like shell elements | p. 368 |
Shell plasticity: Ilyushin’s criterion | p. 369 |
Bibliography | p. 373 |
Large Strains | p. 375 |
Hyperelasticity | p. 377 |
More continuum mechanics | p. 377 |
Momentum balance and stress tensors | p. 377 |
Objective stress rates | p. 380 |
Principal stretches and invariants | p. 384 |
Strain-energy functions | p. 386 |
Incompressibility and near-incompressibility | p. 388 |
Strain energy as a function of stretch invariants | p. 390 |
Strain energy as a function of principal stretches | p. 394 |
Logarithmic extension of linear elasticity: Hencky model | p. 398 |
Element technology | p. 400 |
u/p formulation | p. 401 |
Enhanced Assumed Strain elements | p. 404 |
F-bar approach | p. 406 |
Corotational approach | p. 407 |
Bibliography | p. 409 |
Large-strain elastoplasticity | p. 411 |
Eulerian formulations | p. 412 |
Multiplicative elastoplasticity | p. 417 |
Multiplicative elastoplasticity vs rate formulations | p. 421 |
Integration of the rate equations | p. 424 |
Exponential return-mapping algorithms | p. 428 |
Bibliography | p. 432 |
Advanced Discretisation Concepts | p. 435 |
Interfaces and discontinuities | p. 437 |
Interface elements | p. 437 |
Discontinuous Galerkin methods 446 Bibliography | p. 450 |
Meshless and partition-of-unity methods | p. 451 |
Meshless methods | p. 452 |
The element-free Galerkin method | p. 452 |
Application to fracture | p. 456 |
Higher-order damage mechanics 458 Contents | p. 5 |
Volumetric locking | p. 460 |
Partition-of-unity approaches | p. 461 |
Application to fracture | p. 465 |
Extension to large deformations | p. 470 |
Dynamic fracture | p. 476 |
Weak discontinuities | p. 479 |
Bibliography | p. 480 |
Isogeometric finite element analysis | p. 483 |
Basis functions in computer aided geometric design | p. 483 |
Univariate B-splines | p. 484 |
Univariate non-uniform rational B-splines | p. 487 |
Multivariate B-splines and NURBS patches | p. 488 |
T-splines | p. 490 |
Isogeometric finite elements | p. 493 |
B'ezier element representation | p. 493 |
B'ezier extraction | p. 495 |
PYFEM: Shape functions for isogeometric analysis | p. 497 |
Isogeometric analysis in non-linear solid mechanics | p. 500 |
Design-through-analysis of shell structures | p. 500 |
Higher-order damage models | p. 505 |
Cohesive-zone models | p. 510 |
Bibliography | p. 518 |
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