Failure and damage characterization of (±30°) biaxial braided composites under multiaxial stress states

2016 ◽  
Vol 90 ◽  
pp. 748-759 ◽  
Author(s):  
Jörg Cichosz ◽  
Tobias Wehrkamp-Richter ◽  
Hannes Koerber ◽  
Roland Hinterhölzl ◽  
Pedro P. Camanho
Keyword(s):  
Multiaxial Stress ◽  
Braided Composites ◽  
Damage Characterization ◽  
Stress States

scholarly journals Multiaxial Damage Characterization of Carbon/Epoxy Angle-Ply Laminates under Static Tension by Combining In Situ Microscopy with Acoustic Emission

2018 ◽  
Vol 8 (11) ◽  
pp. 2021 ◽  
Author(s):  
Kalliopi-Artemi Kalteremidou ◽  
Brendan Murray ◽  
Eleni Tsangouri ◽  
Dimitrios Aggelis ◽  
Danny Van Hemelrijck ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Shear Loading ◽  
Image Correlation ◽  
Epoxy Composites ◽  
Multiaxial Stress ◽  
Damage Characterization ◽  
Stress States ◽  
Angle Ply Laminates

Investigating the damage progression in carbon/epoxy composites is still a challenging task, even after years of analysis and study. Especially when multiaxial stress states occur, the development of damage is a stochastic phenomenon. In the current work, a combined nondestructive methodology is proposed in order to investigate the damage from the static tensile loading of carbon fiber reinforced epoxy composites. Flat angle-ply laminates are used to examine the influence of multiaxial stress states on the mechanical performance. In situ microscopy is combined with acoustic emission in order to qualitatively and quantitatively estimate the damage sequence in the laminates. At the same time, digital image correlation is used as a supporting tool for strain measurements and damage indications. Significant conclusions are drawn, highlighting the dominant influence of shear loading, leading to the deduction that the development of accurate damage criteria is of paramount importance. The data presented in the current manuscript is used during ongoing research as input for the damage characterization of the same material under fatigue loads.

Damage characterization of 3D braided composites using carbon nanotube-based in situ sensing

2010 ◽  
Vol 41 (10) ◽  
pp. 1531-1537 ◽  
Author(s):  
Kyoung Ju Kim ◽  
Woong-Ryeol Yu ◽  
Joon Seok Lee ◽  
Limin Gao ◽  
Erik T. Thostenson ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Damage Characterization ◽  
In Situ Sensing

Damage characterization of aluminum 2024 thin sheet for different stress triaxialities

2018 ◽  
Vol 18 (3) ◽  
pp. 702-712 ◽  
Author(s):  
G.H. Majzoobi ◽  
M. Kashfi ◽  
N. Bonora ◽  
G. Iannitti ◽  
A. Ruggiero ◽  
...  
Keyword(s):  
Thin Sheet ◽  
Damage Characterization

Experimental-Numerical Characterization of Ordinary Concrete at the Meso-Scale

2021 ◽  
Author(s):  
GIANLUCA MAZZUCCO ◽  
Beatrice Pomaro ◽  
Giovanna Xotta ◽  
Enrico Garbin ◽  
Valentina Salomoni ◽  
...  
Keyword(s):  
Yield Criterion ◽  
Plain Concrete ◽  
Point Of View ◽  
Good Prediction ◽  
Deformation Capacity ◽  
Compression Tests ◽  
Fe Method ◽  
Stress States ◽  
Meso Scale

Modeling the post-peak behaviour of brittle materials like concrete is still a challenge from the point of view of computational mechanics, due to the strong nonlinearities arising in the material behaviour during softening and the complexity of the yield criterion that may describe their deformation capacity in generic triaxial stress states. A numerical model for plain concrete in compression is formulated within the framework of the coupled elasto-plastic-damage theory. The aim is to simulate via the Finite Element (FE) method the stress-strain behaviour of concrete at the meso-scale, where local confinement effects generally characterize the cement paste under the action of the surrounding aggregates. The mechanical characterization of the components are accomplished through a specific experimental campaign. With the subsequent validation study, it is shown that a few calibration parameters give a good prediction of load strength and deformation capacity coming from real uniaxial compression tests.

Analysis of Residual Stresses and Distortions in Brazed Joints of Cemented Carbide and Steel

2005 ◽  
Vol 490-491 ◽  
pp. 491-496 ◽  
Author(s):  
A. Ottlik ◽  
Volker Schulze ◽  
L. Pintschovius ◽  
Hermann Müller ◽  
Detlef Löhe
Keyword(s):  
Residual Stresses ◽  
Fatigue Behaviour ◽  
Complex Stress ◽  
Cemented Carbide ◽  
Experimental Characterization ◽  
Fem Simulations ◽  
X Ray ◽  
Brazed Joints ◽  
Stress States

Brazing of cemented carbides to steel bodies gives rise to the development of complex stress states and distortions which influence the fatigue behaviour of the parts. It is quite important to estimate the residual stresses with numerical methods whose agreement is to be guaranteed with experimental characterization of the brazed parts. In this work FEM simulations and X-ray as well as neutron stress analysis were used to examine the residual stresses of brazed samples. Joints with different geometries and dimensions made of cemented carbide and different steels showing different phase transformation behaviours were investigated.

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