Influence of in-plane shear on kink-plane orientation in a unidirectional
Artikel i vetenskaplig tidskrift, 2019

Kink-band formation is the governing failure mechanism for compressive failure of fibre reinforced composites.

Here, kink-plane orientation, describing the direction of kink-band formation, is studied using X-ray computed

tomography (CT). Unnotched unidirectional specimens with off-axis angles ranging from 0° to 20° are tested in

compression. The measured compressive strength is found practically constant for off-axis angles between 0° and

10°. For an off-axis angle of 15° the compressive strength drops dramatically. CT-results reveal this drop to be

consistent with a transition from out-of-plane to in-plane dominated kinking. Furthermore, results show the

kink-plane angle to be linearly dependant on off-axis angle, and hence in-plane shear stress. A three-dimensional

finite element model considering measured fibre misalignment angles through its volume is generated for numerical

analysis. Numerical predictions based on the LaRC05 kinking criterion are found to qualitatively capture

the experimentally observed effects of off-axis angle on kink-plane orientation.

C. Finite element analysis (FEA)

A. Carbon fibres


Dennis Wilhelmsson

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Lars Mikkelsen

Søren Fæster

Leif Asp

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Composites Part A: Applied Science and Manufacturing

1359-835X (ISSN)

Vol. 119 283-290

Dimensioneringsmetodik för tryckbelastad NCF komposit (KOMPRESS II)

VINNOVA, 2017-11-10 -- 2019-12-31.


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