Crack closure and fibre bridging during delamination growth in carbon fibre/epoxy laminates under mode I fatigue loading

2014 ◽  
Vol 67 ◽  
pp. 201-211 ◽  
Author(s):  
Rafiullah Khan ◽  
René Alderliesten ◽  
Liaojun Yao ◽  
Rinze Benedictus
Keyword(s):  
Carbon Fibre ◽  
Crack Closure ◽  
Fatigue Loading ◽  
Mode I ◽  
Delamination Growth ◽  
Fibre Bridging

scholarly journals Mode I fatigue delamination growth with fibre bridging in multidirectional composite laminates

2018 ◽  
Vol 189 ◽  
pp. 221-231 ◽  
Author(s):  
Liaojun Yao ◽  
Yi Sun ◽  
Licheng Guo ◽  
Xiuqi Lyu ◽  
Meiying Zhao ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Mode I ◽  
Delamination Growth ◽  
Fibre Bridging

scholarly journals Fibre bridging effect on the Paris relation for mode I fatigue delamination growth in composites with consideration of interface configuration

2017 ◽  
Vol 159 ◽  
pp. 471-478 ◽  
Author(s):  
Liaojun Yao ◽  
Yi Sun ◽  
R.C. Alderliesten ◽  
R. Benedictus ◽  
Meiying Zhao
Keyword(s):  
Mode I ◽  
Delamination Growth ◽  
Fibre Bridging

Delamination Fatigue Properties of Z-Pinned Composites

2014 ◽  
Vol 891-892 ◽  
pp. 197-201
Author(s):  
Khomkrit Pingkarawat ◽  
Adrian P. Mouritz
Keyword(s):  
Growth Rate ◽  
Experimental Investigation ◽  
Carbon Fibre ◽  
Fatigue Resistance ◽  
Volume Content ◽  
Fatigue Properties ◽  
Mode I ◽  
Thickness Direction ◽  
Toughening Mechanisms ◽  
Delamination Growth

This paper presents an experimental investigation into the mode I interlaminar fatigue resistance of carbon fibre-epoxy laminate reinforced in the through-thickness direction with z-pins. The effects of the volume content, diameter and length of z-pins on the interlaminar toughness, fatigue resistance and crack bridging toughening mechanisms are determined. The delamination growth rate also slowed when the volume content or length of the z-pins was increased or the z-pin diameter was reduced.

Mode I delamination growth of multidirectional composite laminates under fatigue loading

2011 ◽  
Vol 45 (10) ◽  
pp. 1077-1090 ◽  
Author(s):  
Lei Peng ◽  
Jianyu Zhang ◽  
Libin Zhao ◽  
Rui Bao ◽  
Hongqin Yang ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Fatigue Loading ◽  
Mode I ◽  
Delamination Growth ◽  
Mode I Delamination

scholarly journals Influence of Reversed Fatigue Loading on Damage Evolution of Cross-Ply Carbon Fibre Composites

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1153 ◽  
Author(s):  
Just ◽  
Koch ◽  
Brod ◽  
Jansen ◽  
Gude ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Carbon Fibre ◽  
Crack Formation ◽  
Crack Opening ◽  
Local Stress ◽  
Fatigue Loading ◽  
Stress Concentrations ◽  
Delamination Growth ◽  
Stress Ratios ◽  
Carbon Fibre Composites

Microcrack formation and delamination growth are the main damage mechanisms in thefatigue of composites. They lead to significant stiffness loss, introduce stress concentrations andcan be the origin of subsequent damage events like buckling or fibre breakage, especially in case ofshear and compression stresses during load reversal. Fatigue experiments of carbon fibre reinforcedlaminates were conducted at several stress ratios and analysed in terms of crack and delaminationgrowth. These investigations were accompanied by microscopic imaging, digital image correlationand finite element modelling to take into account the effects of residual stresses and crack closure.It was found that residual stresses significantly change the local stress ratio in off-axis layers andlead to residual crack opening of inter fibre cracks. These cracks remain open and close under highcompression loadings only. Furthermore, crack formation under pulsating compression loadingturned out to be driven by residual stresses leading to perpendicular cracks as observed underpure tension loading. The experimental findings further confirm the severe detrimental effect oftension-compression loading on crack formation and delamination growth compared to pulsatingtension-tension or compression-compression loads.

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