IUTAM Symposium on Creep in Structures : Proceedings of the IUTAM Symposium held in Nagoya, Japan, 3-7 April 2000

The advent of steam turbines and the sudden rise of steam temperature at the beginning of the 20th century gave a great impetus to the start of scientific research on metal creep and high-temperature strength. Then aeronautical and aerospace exploitation in the 1940's and 1950's enlarged the scope of creep research. In this context, the first IUTAM Symposium on "Creep in Structures" was held at Stanford University in July 1960, and about 60 participants from seven countries around the world discussed their recent results on this problem. Subsequent innovation in science and technology, as in nuclear and new energy technology, new materials, large scale integration of semiconductors etc., has claimed solutions to new and challenging problems in this fundamental field of applied mechanics. In order to discuss the new topics in this discipline, the IUTAM Symposia "Creep in Structures" thereafter have been held every ten years; i.e. the second in 1970 at Gothenburg, Sweden, the third in 1980 at Leicester, U.K. and the fourth in 1990 at Cracow,Poland. The First (1960) and Second Symposium (1970) were concerned mainly with the phenomenological law of creep and creep analysis of structural elements, whereas the issues of the Third Symposium (1980) shifted toward the problems of creep damage, creep crack growth, practical and effective design methods, etc. Front Matter....Pages i-xxii An Opening Address....Pages 1-2 Micromechanism-Quantification for Creep Constitutive Equations....Pages 3-16 Creep of γ-TiAl Based Alloys — Experiments and Computational Modeling....Pages 17-30 Anisotropic Creep of Single Crystal Superalloys....Pages 31-40 A Rate Dependent Formulation for Void Growth in Single Crystal Materials....Pages 41-50 Microstructural Modeling of Creep Fracture in Polycrystalline Materials....Pages 51-64 Creep Crack Growth: From Discrete to Continuum Damage Modeling....Pages 65-74 Prediction of Inner Cracking Behavior in Heat-Resistant Steel under Creep-Fatigue Condition by Means of Three-Dimensional Numerical Simulation....Pages 75-84 Creep of Welded Structures....Pages 85-94 Two Parameter Characterisation of Crack Tip Fields under Creep Conditions....Pages 95-104 Cavity Growth Induced by Electric Current and Stress in LSI Conductor....Pages 105-114 Dislocation Density Simulations for Bulk Single Crystal Growth Process Using Dislocation Kinetics Model....Pages 115-124 Multiaxial Creep Fatigue under Anisothermal Conditions....Pages 125-130 Constitutive Modeling of Viscoplastic Damage in Solder Material....Pages 131-140 Consideration of Stress State Influences in the Material Modelling of Creep and Damage....Pages 141-150 Strain, Stress and Damage Fields in Damaged and Cracked Solids....Pages 151-163 Effects of Damage on the Asymptotic Fields of a Mode I Creep Crack in Steady-State Growth....Pages 165-174 Computational Continuum Damaged Mechanics: Its use in the Prediction of Creep in Structures — Past, Present and Future....Pages 175-188 Cracking of Creeping Structures Described by Means of CDM....Pages 189-196 A Coupled Formulation for Thermo-Viscoplasticity at Finite Strains: Application to Hot Metal Forming....Pages 197-206 Thick Axisymmetric Plate Subjected to Thermo-Mechanical Damage....Pages 207-216 Creep in Shotcrete Tunnel Shells....Pages 217-229 Rupture Life Time Prediction and Deformation Mechanisms during Creep of Single-Crystal Nickel-Base Superalloys....Pages 231-240 Creep Damage Assessment and Void Formation in Engineering Materials....Pages 241-256 Creep Damage Accumulation and Failure in Narrow Regions of Steel Welds....Pages 257-266 Long-Term Creep Life Prediction Based on Understanding of Creep Deformation Behavior of Ferritic Heat Resistant Steels....Pages 267-276 Near-Threshold Fatigue Crack Growth in SUS304 Steel at Elevated Temperatures....Pages 277-286 Approximate Viscoplastic Notch Analysis....Pages 287-296 The Reference Stress Method in Creep Design....Pages 297-309 Study on Creep-Fatigue Life Prediction Methods Based on Long-Term Creep- Fatigue Tests for Austenitic Stainless Steel....Pages 311-320 Developments in Creep Fracture Assessments within the R5 Procedure....Pages 321-330 On Global Approaches to Some Problems Involving Plasticity and Viscosity Effects....Pages 331-340 On the Simulation of Large Viscoplastic Structures under Anisothermal Cyclic Loadings....Pages 341-350 Description of Inelastic Behavior of Perforated Plates Based on Effective Stress Concept....Pages 351-360 The Overstress Model Applied to Normal and Pathological Behavior of Some Engineering Alloys....Pages 361-373 Creep Strain Uncertainties Associated with Testpiece Extensometer Ridges: Their Identification and Reduction....Pages 375-390 Equivalence of Back Stress during Plastic and Creep Deformation....Pages 391-400 Assessment of the Multiaxial Creep Data Based on the Isochronous Creep Surface Concept....Pages 401-410 Biaxial and Triaxial Creep Testing of Type 304 Stainless Steel at 923 K....Pages 411-418 Uniaxial/Multiaxial Creep-Ratchetting of Several Types of Steels and Its Constitutive Modelling....Pages 419-428 Temperature Measurement and Lifetime Prediction of a High-Pressure Turbine Rotor....Pages 429-438 Effects of Matrix Creep on Fiber Stress Profiles in Unidirectional Composites: Mesoscopic Analysis Based on a Variational Method....Pages 439-452 Micromechanics Based Creep Damage Analysis of Unidirectional Metal Matrix Composites....Pages 453-462 Micromechanical Models for Creep in the Consolidation of Composites....Pages 463-468 Off-Axis Creep Behavior of Unidirectional Polymer Matrix Composites at High Temperature....Pages 469-478 Creep of Ice and Microstructural Changes under Confining Pressure....Pages 479-488 Numerical and Experimental Creep Bending Behavior of Polyethylene Beams....Pages 489-498 A Numerical Elastic-Viscoplastic Collapse Analysis of Circular Cylindrical Shells under Axial Compression....Pages 499-508 Time-Dependence of Buckling Load for a Viscoelastic Plate under Creep Condition....Pages 509-518 Back Matter....Pages 519-522 The advent of steam turbines and the sudden rise of steam temperature at the beginning of the 20th century gave a great impetus to the start of scientific research on metal creep and high-temperature strength. Then aeronautical and aerospace exploitation in the 1940's and 1950's enlarged the scope of creep research. In this context, the first IUTAM Symposium on "Creep in Structures" was held at Stanford University in July 1960, and about 60 participants from seven countries around the world discussed their recent results on this problem. Subsequent innovation in science and technology, as in nuclear and new energy technology, new materials, large scale integration of semiconductors etc., has claimed solutions to new and challenging problems in this fundamental field of applied mechanics. In order to discuss the new topics in this discipline, the IUTAM Symposia "Creep in Structures" thereafter have been held every ten years; i.e. the second in 1970 at Gothenburg, Sweden, the third in 1980 at Leicester, U.K. and the fourth in 1990 at Cracow, Poland. The First (1960) and Second Symposium (1970) were concerned mainly with the phenomenological law of creep and creep analysis of structural elements, whereas the issues of the Third Symposium (1980) shifted toward the problems of creep damage, creep crack growth, practical and effective design methods, etc This is the Proceedings of the IUTAM Symposium on Creep in Structures, held at Nagoya, 3-7 April 2000, which is the 5th one of this series of the IUTAM Symposia organized every then years since 1960. The present Proceedings contains 48 innovative papers presented at the 5th Symposium, in which 91 participants from 15 countries participated to consolidate the development of creep research since 1990 and to discuss the new horizons in this fundamental field of applied mechanics in the coming century. The papers contained deal with (1) physical and microstructural process of creep, viscoplasticity and creep damage related to their modeling, (2) elaborated constitutive equations of time-dependent deformation and damage, (3) creep damage and fracture of engineering materials and structures, (4) computational modeling, simulation, analysis and design of structures in creep, and (5) creep of polymers, composites, and heterogeneous materials. This volume is useful for researchers and graduate course students in the relevant fields