Experiments on Damage and Fracture Mechanisms in Ductile Metals Under Non-proportional Loading Paths

2019 ◽  
pp. 19-33 ◽  
Author(s):  
Michael Brünig ◽  
Steffen Gerke ◽  
Moritz Zistl
Keyword(s):  
Fracture Mechanisms ◽  
Proportional Loading ◽  
Ductile Metals ◽  
Loading Paths ◽  
Damage And Fracture

Fatigue of Extruded 2017A Aluminum Alloy Subjected to Non-Proportional Loading Paths

2016 ◽  
Vol 725 ◽  
pp. 334-338
Author(s):  
Omar Allaoui ◽  
Lakhdar Taleb ◽  
Mouaad Brik ◽  
Clément Keller ◽  
Gael Marnier
Keyword(s):  
Aluminum Alloy ◽  
Cyclic Loading ◽  
Room Temperature ◽  
Fracture Mechanisms ◽  
Proportional Loading ◽  
Loading Paths

The present work is devoted to the study of the fatigue of an extruded aluminum alloy 2017A under cyclic loading in axial and shear directions at room temperature. Having the lifetime under a given axial amplitude σa (say, Nf_a) and the lifetime under a given torsional amplitude τa (say, Nf_t) [1], the objective here is to evaluate the lifetime when σa and τa are applied successively according to non-proportional path: σa then τa then σa then τa and so on until the fracture of the specimen. The obtained lifetime Nf_np is then compared to (Nf_a / 2 + Nf_t / 2). The obtained results point out the importance of the loading magnitude. Microstructural analyses have been performed to better understand the fracture mechanisms for the different cases of loadings.

Simulation of Impact Damage in Foam-Based Sandwich Composites

2013 ◽  
Vol 569-570 ◽  
pp. 25-32
Author(s):  
Dian Shi Feng ◽  
Francesco Aymerich
Keyword(s):  
Impact Damage ◽  
Element Model ◽  
Fracture Mechanisms ◽  
Sandwich Composites ◽  
Typically Developing ◽  
Damage Resistance ◽  
Damage And Fracture ◽  
Closed Cell ◽  
Impact Energies ◽  
The Impact

The paper describes the application of a 3D finite element model for prediction of impact induced damage in sandwich composites consisting of laminated skins bonded to a closed cell foam core. The major damage and fracture mechanisms typically developing in transversally loaded sandwich composites were simulated in the model. The model was implemented in the FE package ABAQUS/Explicit and used to predict the impact damage resistance of sandwich panels with different core densities, core thicknesses, and skins layups. Numerical results obtained by FE simulations were compared with experimental data and observations collected through impact tests carried out at various impact energies.

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