Author: M. K. SamalPublisher:
ISBN:
Category :
Languages : en
Pages : 96
Book Description
Modelling of Ductile and Cleavage Fracture by Local Approach
The 'Local Approach' to Cleavage Fracture
Author: C S WiesnerPublisher: Abington Publishing
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 78
Book Description
This report assesses the current state of knowledge of the 'local approach' to cleavage fracture, reviews application to ferritic steels and their weldments and addresses limitations and disadvantages of the methodology.
Local Approach to Fracture
Author: Clotilde BerdinPublisher: Presses des MINES
ISBN: 291176255X
Category : Fracture mechanics
Languages : en
Pages : 91
Book Description
This book presents several aspects of the local approach to fracture: damage mechanisms, experimental techniques, damage evolution law and failure criteria, modelling of damage, and numerical simulation -- Back cover.
Local Approach to Fracture
Author: Jacques BessonPublisher: Presses des MINES
ISBN: 2911762738
Category : Fracture mechanics
Languages : en
Pages : 121
Book Description
Improving the structural integrity together with the performance (weight, time to failure,...) of structures requires a persisting effort in the field of mechanics of materials and structures. This can be achieved by a better understanding of the relationships between microscopic mechanisms and the macroscopic material behavior and structural response with respect to damage and fracture. This improvement strategy of materials, structures and assement methods can be described as local approach to fracture. The local approach to fracture is an active research field. Initially developped in the context of steel structures (pressure vessels), its application domain has become wider and now deals with various kinds of materials (metallic alloys, metal matrix composites, polymers, elastomers, concrete) as well as various physical deformation and damage mechanisms (plasticity, creep, fatigue, ductile fracture, brittle fracture, ...). This volume contains the proceedings on an international conference dedicated to these issues.
Development of Numerical Approaches to Predict Ductile and Cleavage Fracture of Structural Materials
Author: Guihua ZhangPublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 131
Book Description
"Numerical simulations mainly using finite element method are playing a more and more important role in prediction of fracture-induced failure for high performance structure. This thesis seeks to develop numerical approaches to predict ductile and cleavage fracture in structural materials. For ductile fracture, the discrete void approach reveals the failure mechanisms explicitly and is used to study the trends of fracture toughness. The porous continuum approach provides an effective means to predict extensive crack propagation. We consider the occurrence of material failure (void coalescence) as when localization of plastic flow takes place in the inter-void ligament and obtain the failure criterion as a function of the stress triaxiality ratio and the Lode angle. The Gologanu-Leblond Devaux (GLD) model, which accounts for the evolution of both void volume and void shape, is used to describe the porous placticity behavior and is implemented into ABAQUS via a user subroutine. Numerical simulations are performed to predict extensive crack growth in ductile solids for a thin aluminum 2024-T3 plate and verified by successful predication of crack extension in various specimens, including the multiple site damage speciments. The effect of stress triaxiality and Lode angle is further analyzed and the Xue-Wierzbicki fracture locus is employed as a criterion for void colescence. Combination of GLD model and X-W fracture locus is then applied to a DH-36 steel with specimens experiencing a wide range of stress triaxiality and Lode angles at failure. The numerical simulation results agree very well with the experimental results. For cleavage fracture, a modified three parameter Weibull stress model is proposed and used to predict the fracture of A508 steel at three different temperatures. By integrating the Weibull stress model over the plastic process zone, the failure probability can be obtained and comparison is made with the experiment result. Issues addressed include calibration of the model parameters, introduction of a threshold parameter, dependencies of the model parameters on temperature, plastic strain effect and crack tip triaxiality effect, etc."--Abstract.
Advances in Fracture Research
Author: Alberto CarpinteriPublisher: Springer
ISBN: 9781402046261
Category : Science
Languages : en
Pages : 262
Book Description
This book is a spin-off from the International Journal of Fracture and collects lectures and papers presented at the 11th International Conference on Fracture (ICF11), March 20-25, 2005. Included in this volume are introductory addresses, as well as remarks on the presentation of honorary degrees. A collection of papers follows, including presentations by such eminent scientists as B.B. Mandelbrot, G.I. Barenblatt, and numerous others, reviewing advanced research in fracture.
Stochastic Micromechanical Modeling of Cleavage Fracture in the Ductile-brittle Transition Region
Author: David I. Auen StienstraPublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 504
Book Description
Ductile Fracture in Metal Forming
Author: Kazutake KomoriPublisher: Academic Press
ISBN: 0128147733
Category : Technology & Engineering
Languages : en
Pages : 296
Book Description
Ductile Fracture in Metal Forming: Modeling and Simulation examines the current understanding of the mechanics and physics of ductile fracture in metal forming processes while also providing an approach to micromechanical ductile fracture prediction that can be applied to all metal forming processes. Starting with an overview of different ductile fracture scenarios, the book then goes on to explain modeling techniques that predict a range of mechanical phenomena that can lead to ductile fracture. The challenges in creating micromechanical models are addressed alongside methods of applying these models to several common metal forming processes. This book is suitable for researchers working in mechanics of materials, metal forming, mechanical metallurgy, and plasticity. Engineers in R&D industries involved in metal forming such as manufacturing, aerospace, and automation will also find the book very useful. - Explains innovative micromechanical modeling techniques for a variety of material behaviors - Examines how these models can be applied to metal forming processes in practice, including blanking, arrowed cracks in drawing, and surface cracks in upset forging - Provides a thorough examination of both macroscopic and microscopic ductile fracture theory
Predictions of Specimen Size Dependence on Fracture Toughness for Cleavage and Ductile Tearing
Author: TL. AndersonPublisher:
ISBN:
Category : Cleavage
Languages : en
Pages : 19
Book Description
A framework for predicting the effect of crack-tip triaxiality on fracture toughness is outlined. This methodology is a two-parameter approach that considers the micromechanism of failure. A local damage parameter is used in conjunction with a crack-tip stress analysis to predict the effect of specimen dimensions on toughness. In the case of cleavage fracture, the local criterion involves the maximum principal normal stress, ?1 as well as the volume over which ?1 acts. The agreement between predictions and experimental data is very good in this case. for initiation of ductile tearing, we defined a damage parameter based on a modified version of the Rice and Tracey hole growth model. The analysis indicates that ductile fracture is less sensitive than cleavage to triaxiality. While this result is broadly consistent with experimental observations, further work is necessary to develop improved local criteria for ductile fracture.
Author: Li Wang