Strain Gradient Plasticity-Based Modeling of Damage and Fracture

Beschreibung

This book provides a comprehensive introduction to numerical modeling of size effects in metal plasticity. The main classes of strain gradient plasticity formulations are described and efficiently implemented in the context of the finite element method. A robust numerical framework is presented and employed to investigate the role of strain gradients on structural integrity assessment. The results obtained reveal the need of incorporating the influence on geometrically necessary dislocations in the modeling of various damage mechanisms. Large gradients of plastic strain increase dislocation density, promoting strain hardening and elevating crack tip stresses. This stress elevation is quantified under both infinitesimal and finite deformation theories, rationalizing the experimental observation of cleavage fracture in the presence of significant plastic flow. Gradient-enhanced modeling of crack growth resistance, hydrogen diffusion and environmentally assisted cracking highlighted the relevance of an appropriate characterization of the mechanical response at the small scales involved in crack tip deformation. Particularly promising predictions are attained in the field of hydrogen embrittlement. The research has been conducted at the Universities of Cambridge, Oviedo, Luxembourg, and the Technical University of Denmark, in a collaborative effort to understand, model and optimize the mechanical response of engineering materials. 

Nominated as an outstanding PhD thesis by University of Oviedo, Spain

Is the first book to address the modeling of size effects in metal plasticity

Proposes a general framework for crack tip assessment accounting for the role of geometrically necessary dislocations (GNDs) in fracture and damage

Autor*in

Emilio Martínez Pañeda

Themen in »Strain Gradient Plasticity-Based Modeling of Damage and Fracture«

Strain Gradient Plasticity Crack Tip Mechanics Hydrogen Embrittlement Geometrically Necessary Dislocations (GNDs) Finite Element Analysis Gradient Plasticity Multi-scale Material Modeling Taylor Dislocation Model Material Length Scale Finite Deformation Theory Cohesive Zone Model Energetic And Dissipative Length Scales Extended Finite Element Method Hydrogen Assisted Cracking Stress-assisted Hydrogen Diffusion

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http://www.mek.dtu.dk/english/nyheder/nyhed?id=81A01354-262A-45B3-8F70-508B90DE6182
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