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Ductile Fracture in Metal Forming


Ductile Fracture in Metal Forming
  • Author : Kazutake Komori
  • Publisher : Academic Press
  • Release : 2019-10-11
  • ISBN : 9780128147733
  • Language : En, Es, Fr & De
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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

Ductile Fracture of Metals


Ductile Fracture of Metals
  • Author : P. F. Thomason
  • Publisher : Pergamon
  • Release : 1990
  • ISBN : UOM:39015017897771
  • Language : En, Es, Fr & De
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An account of the recent developments in research into ductile fracture in metals and alloys. Aspects covered include localized fracture at the root of notches and sharp cracks, and fracture in bulk plastic-deformation processes of the metal and metal forming type. Also discusses various theoretical

Modeling of Ductile Fracture from Shear to Balanced Biaxial Tension for Sheet Metals


Modeling of Ductile Fracture from Shear to Balanced Biaxial Tension for Sheet Metals
  • Author :
  • Publisher :
  • Release : 2017
  • ISBN : OCLC:1052044166
  • Language : En, Es, Fr & De
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Highlights: A model is proposed to describe shear ductile fracture from shear to the balanced biaxial tension. The stress invariant-based Drucker yield function is specified for BCC and FCC metals to the balanced biaxial tension. The model is successfully employed to predict ductile fracture of AA6082 in wide loading conditions. The model could also be used to describe ductile fracture under low and negative stress triaxiality with improved flexibility. Abstract: A ductile fracture model is proposed to describe shear fracture of sheet metals from shear to balanced biaxial tension via uniaxial and plane strain tension. The fracture criterion models plastic damage as strain-induced void nucleation, triaxiality-governed void enlargement, Lode-controlled void torsion, and shear-restrained coalescence of voids. Its flexibility is investigated by a parameter study of the ductile fracture model proposed. The fracture model is employed to describe ductile fracture behavior of an aluminum alloy AA6082 T6 (thickness: 1.0 mm). Dogbone specimens are strained to characterize the strain hardening properties, while another four different specimens are tested to characterize fracture behavior in shear, uniaxial tension, plane strain tension and balanced biaxial tension. The loading processes are analyzed numerically with the stress invariant-based Drucker yield function which is for the first time specified for body-centered cubic and face-centered cubic metals. Fracture strains in various loading conditions are measured with a hybrid experimental-numerical approach. The measured fracture strains are then used to calibrate the ductile fracture model proposed. The ductile fracture model calibrated above is employed to predict the onset of ductile fracture for these four specimens. For the purpose of comparison, the predicted fracture strokes of these four loading conditions are compared with those predicted by the modified Mohr–Coulomb model (Baiand Wierzbicki, 2008 ), and two micromechanism-inspired criteria proposed recently (Lou etal., 2012, 2014 ). The comparison reveals that the proposed model predicts the fracture behavior in much better agreement compared with experimental results from shear to the balanced biaxial tension. Accordingly, the proposed ductile fracture criterion is recommended for the prediction of ductile fracture in sheet metal forming processes, optimization of forming parameters and design of tools for both solid elements and shell elements. Besides, the ductile fracture model proposed can also be applied in various bulk metal forming processes in case that the model is calibrated by proper sets of experiments.

Micromechanics Modelling of Ductile Fracture


Micromechanics Modelling of Ductile Fracture
  • Author : Zengtao Chen
  • Publisher : Springer Science & Business Media
  • Release : 2013-04-02
  • ISBN : 9789400760981
  • Language : En, Es, Fr & De
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This book summarizes research advances in micromechanics modeling of ductile fractures made in the past two decades. The ultimate goal of this book is to reach manufacturing frontline designers and materials engineers by providing a user-oriented, theoretical background of micromechanics modeling. Accordingly, the book is organized in a unique way, first presenting a vigorous damage percolation model developed by the authors over the last ten years. This model overcomes almost all difficulties of the existing models and can be used to completely accommodate ductile damage developments within a single-measure microstructure frame. Related void damage criteria including nucleation, growth and coalescence are then discussed in detail: how they are improved, when and where they are used in the model, and how the model performs in comparison with the existing models. Sample forming simulations are provided to illustrate the model’s performance.

Modeling of Metal Forming and Machining Processes


Modeling of Metal Forming and Machining Processes
  • Author : Prakash Mahadeo Dixit
  • Publisher : Springer Science & Business Media
  • Release : 2008-05-14
  • ISBN : 9781848001893
  • Language : En, Es, Fr & De
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Written by authorities in the subject, this book provides a complete treatment of metal forming and machining by using the computational techniques FEM, fuzzy set theory and neural networks as modelling tools. The algorithms and solved examples included make this book of value to postgraduates, senior undergraduates, and lecturers and researchers in these fields. Research and development engineers and consultants for the manufacturing industry will also find it of use.