Influence of plasma surface treatments on kink band formation in PBO fibers during compression

2011 ◽  
Vol 123 (4) ◽  
pp. 2052-2063 ◽  
Author(s):  
Eduardo Lorenzo-Villafranca ◽  
Katia Tamargo-Martínez ◽  
Jon M. Molina-Aldareguia ◽  
Carlos González ◽  
Amelia Martínez-Alonso ◽  
...  
Keyword(s):  
Kink Band ◽  
Surface Treatments ◽  
Band Formation ◽  
Plasma Surface

Micromechanics of kink band formation in open-hole fibre composites under compressive loading

2018 ◽  
Vol 149 ◽  
pp. 66-73 ◽  
Author(s):  
Vedad Tojaga ◽  
Simon P.H. Skovsgaard ◽  
Henrik Myhre Jensen
Keyword(s):  
Compressive Loading ◽  
Kink Band ◽  
Band Formation ◽  
Fibre Composites ◽  
Open Hole

Dynamic Behavior of Fiber Reinforced Composites Under Multiaxial Compression

1999 ◽  
Author(s):  
Kenji Oguni ◽  
G. Ravichandran
Keyword(s):  
Failure Mode ◽  
Kink Band ◽  
Fiber Reinforced Composites ◽  
Fiber Direction ◽  
Strain Rates ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Band Formation ◽  
Multiaxial Compression ◽  
Axial Splitting

Abstract Results from an experimental investigation on the mechanical behavior of a unidirectional reinforced polymer composite with 50% volume fraction E-glass/vinylester under uniaxial and proportional multiaxial compression are presented. Specimens are loaded in the fiber direction using a servo-hydraulic material testing system for low strain rates and a Kolsky (split Hopkinson) pressure bar for high strain rates, up to 3000 s−1. The results indicate that the compressive strength of the composite increases with increasing levels of confinement and increasing strain rates. Post-test optical and scanning electron microscopy is used to identify the failure modes. The failure mode that is observed in unconfined specimen is axial splitting followed by fiber kink band formation. At high levels of confinement, the failure mode transitions from axial splitting to kink band formation and fiber failure. Also, a new energy based analytic model for studying axial splitting phenomenon in unidirectional fiber-reinforced composites is presented.

scholarly journals Plasma Surface Treatments of Nonwovens

10.5772/61307 ◽  
2016 ◽  
Author(s):  
Burçak Karagüzel Kayaoglu
Keyword(s):  
Surface Treatments ◽  
Plasma Surface

Fatigue Behaviour of Triaxial Braided Composites under Tension-Tension and Compression-Compression Loading

2019 ◽  
Vol 809 ◽  
pp. 23-28
Author(s):  
Florian Herrla ◽  
Helmut Rapp
Keyword(s):  
Cyclic Loading ◽  
Kink Band ◽  
Fatigue Behaviour ◽  
Stiffness Degradation ◽  
Braided Composites ◽  
Material Degradation ◽  
Band Formation ◽  
Compression Loading ◽  
Tension And Compression ◽  
Tension Loading

The fatigue behaviour of [0°/±45°] triaxial braided composites is investigated. Tension-tension and compression-compression loading is chosen to study main damage mechanisms and their effect on the stiffness degradation. In both cyclic loading cases a high stiffness degradation can be observed shortly after the start of cyclic loading. Inter-fibre fractures in the braid yarns with subsequent delaminations are responsible for this behaviour during tension-tension loading. Compression-compression loading leads to kink band formation in the axial yarns favoured by yarn undulations. In consequence of the observed material degradation, S-N curves based on a defined level of stiffness degradation are proposed for fatigue dimensioning instead of load cycles to fracture.

Investigation of the axial compressive behavior of Kevlar fibers using the dynamic loop test

2019 ◽  
Vol 89 (18) ◽  
pp. 3825-3838
Author(s):  
Ahmad Abuobaid ◽  
Raja Ganesh ◽  
John W Gillespie
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
Failure Strain ◽  
Kink Band ◽  
Test Method ◽  
Strain Rates ◽  
Compressive Failure ◽  
Band Formation ◽  
Rate Dependent ◽  
Strain And Strain Rate

A dynamic loop test method for measuring strain rate-dependent fiber properties was developed. During dynamic loop testing, the fiber ends are accelerated at constant levels of 20.8, 50 and 343 m/s2. The test method is used to study Kevlar® KM2-600, which fails in axial compression due to kink band formation. The compressive failure strain and strain rate at the onset of kink band formation is calculated from the critical loop diameter ( D C), which is monitored throughout the test using a high-speed camera. The results showed that compressive failure strain increases with strain rates from quasi-static to a maximum strain rate of 116 s−1 by a factor of ∼3. Kink angles (φ) and kink band spacing ( D S) were 60 ° ± 2 ° and 16 ± 3 μm, respectively, over the strain rates tested. Rate-dependent mechanisms of compressive failure by kink band formation were discussed.

scholarly journals Kink Band Formation in High-strength Bulk Metallic Nanolaminates

2015 ◽  
Vol 21 (S3) ◽  
pp. 1157-1158 ◽  
Author(s):  
T. Nizolek ◽  
N.A. Mara ◽  
R.J. McCabe ◽  
J.T. Avallone ◽  
I.J. Beyerlein ◽  
...  
Keyword(s):  
High Strength ◽  
Kink Band ◽  
Band Formation
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