Author: Anders F. BlomPublisher:
ISBN:
Category :
Languages : en
Pages : 34
Book Description
An Experimental and Numerical Study of Crack Closure
Author: Anders F. BlomRapid Crack Propagation
Author: The Virtual Crack Closure Technique: History, Approach and Applications
Author: Ronald KruegerPublisher:
ISBN:
Category :
Languages : en
Pages : 66
Book Description
An overview of the virtual crack closure technique is presented. The approach used is discussed, the history summarized, and insight into its applications provided. Equations for two-dimensional quadrilateral elements with linear and quadratic shape functions are given. Formula for applying the technique in conjuction with three-dimensional solid elements as well as plate/shell elements are also provided. Necessary modifications for the use of the method with geometrically nonlinear finite element analysis and corrections required for elements at the crack tip with different lengths and widths are discussed. The problems associated with cracks or delaminations propagating between different materials are mentioned briefly, as well as a strategy to minimize these problems. Due to an increased interest in using a fracture mechanics based approach to assess the damage tolerance of composite structures in the design phase and during certification, the engineering problems selected as examples and given as references focus on the application of the technique to components made of composite materials.
Advances in Fatigue Crack Closure Measurement and Analysis
Author: R. Craig McClungPublisher: ASTM International
ISBN: 0803126115
Category : Fracture mechanics
Languages : en
Pages : 487
Book Description
Mechanism of Brittle Fracture of Rock
Author: Z. T. BieniawskiPublisher:
ISBN:
Category : Brittleness
Languages : en
Pages : 486
Book Description
Mechanics of Fatigue Crack Closure
Author: Wolf ElberPublisher: ASTM International
ISBN: 0803109962
Category : Fracture mechanics
Languages : en
Pages : 671
Book Description
Development of Fatigue Crack Closure with the Extension of Long and Short Cracks in Aluminum Alloy 2124
Author: AF. BlomPublisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 17
Book Description
The development of crack closure during the extension of long and short fatigue cracks has been investigated in a 2124 aluminum alloy using both experimental and numerical procedures. Specifically, the growth rate and closure behavior of long (~17 to 38 mm) cracks in compact C(T) specimens and through-thickness physically-short (~50 to 40 ?m) cracks in single-edge-notched SEN(B) bend specimens have been examined experimentally from threshold levels to instability (over the range ~10-12 to 10-7 m/cycle), and results compared with those predicted numerically using an elastic-plastic finite-element analysis of fatigue crack advance in plane strain. It is shown that the numerical analysis consistently underpredicts the magnitude of crack closure for both long and short cracks, particularly at near-threshold levels; an observation attributed to the fact that the numerical procedures can only model contributions to closure from cyclic plasticity, whereas, in reality, significant additional closure arises from the wedging action of fracture surface asperities and corrosion debris. Such closure is shown to provide the predominant mechanism for rationalizing differences in the growth rate behavior between long and physically short cracks, although other factors, such as the nature of the singularity and the extent of local plasticity, are deemed potentially to be important.
An Experimental and Numerical Investigation of Crack Growth Characteristics in Surface Cracked Specimens Under Combined Loading
Author: Jonas FaleskogLaser shock peening Performance and process simulation
Author: K. DingPublisher: CRC Press
ISBN: 9780849334443
Category : Technology & Engineering
Languages : en
Pages : 182
Book Description
Laser shock peening (LSP) is a process for inducing compressive residual stresses using shock waves generated by laser pulses. It is a relatively new surface treatment for metallic materials that can greatly improve their resistance to crack initiation and propagation brought on by cyclic loading and fatigue. This book, the first of its kind, consolidates the scattered knowledge about LSP into one comprehensive volume. It describes the mechanisms of LSP and its substantial role in improving fatigue performance in terms of modification of microstructure, surface morphology, hardness, and strength. In particular, it describes numerical simulation techniques and procedures that can be adopted by engineers and research scientists to design, evaluate, and optimize LSP processes in practical applications.
Author: