Energy release rate and stress field calculation for debonding crack extension at the fibre-matrix interface during single-fibre pull-out

1995 ◽  
Vol 3 (4) ◽  
pp. 263-273 ◽  
Author(s):  
B. Lauke ◽  
W. Beckert ◽  
J. Singletary
Keyword(s):  
Stress Field ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Crack Extension ◽  
Single Fibre ◽  
Field Calculation ◽  
Matrix Interface ◽  
Pull Out ◽  
Fibre Matrix

scholarly journals Analytical Fracture Mechanics Analysis of the Pull-Out Test Including the Effects of Friction and Thermal Stresses

2000 ◽  
Vol 9 (6) ◽  
pp. 096369350000900 ◽  
Author(s):  
John A. Nairn
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Thermal Stresses ◽  
Interfacial Crack ◽  
Single Fibre ◽  
Finite Elements Analysis ◽  
Accurate Analysis ◽  
Pull Out ◽  
Microbond Test

The energy release rate for propagation of a debond in a single-fibre pull out test was derived analytically. The key finding was that an accurate analysis can be derived by a global energy analysis that includes effects of residual stresses and interfacial friction but does not need to include the details of the stress state at the interfacial crack tip. By comparison to finite elements analysis, it was verified that the analytical results are very accurate provided the debond tip is not too close to either end of the specimen. By casting the results in terms of net-specimen stress, it was possible to derive a general energy release rate result that applies to both the pull-out test and the related microbond test. The energy release rate expressions can be used to determine interfacial fracture toughness from single-fibre pull-out tests or microbond tests.

scholarly journals Study of Strain-Hardening Behaviour of Fibre-Reinforced Alkali-Activated Fly Ash Cement

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4015
Author(s):  
Hyuk Lee ◽  
Vanissorn Vimonsatit ◽  
Priyan Mendis ◽  
Ayman Nassif
Keyword(s):  
Fly Ash ◽  
Energy Release Rate ◽  
Strain Hardening ◽  
Energy Release ◽  
Release Rate ◽  
Critical Energy ◽  
Critical Energy Release Rate ◽  
Pull Out ◽  
Alkali Activated ◽  
Alkali Activated Cement

This paper presents a study of parameters affecting the fibre pull out capacity and strain-hardening behaviour of fibre-reinforced alkali-activated cement composite (AAC). Fly ash is a common aluminosilicate source in AAC and was used in this study to create fly ash based AAC. Based on a numerical study using Taguchi’s design of experiment (DOE) approach, the effect of parameters on the fibre pull out capacity was identified. The fibre pull out force between the AAC matrix and the fibre depends greatly on the fibre diameter and embedded length. The fibre pull out test was conducted on alkali-activated cement with a capacity in a range of 0.8 to 1.0 MPa. The strain-hardening behaviour of alkali-activated cement was determined based on its compressive and flexural strengths. While achieving the strain-hardening behaviour of the AAC composite, the compressive strength decreases, and fine materials in the composite contribute to decreasing in the flexural strength and strain capacity. The composite critical energy release rate in AAC matrix was determined to be approximately 0.01 kJ/m 2 based on a nanoindentation approach. The results of the flexural performance indicate that the critical energy release rate of alkali-activated cement matrix should be less than 0.01 kJ/m 2 to achieve the strain-hardening behaviour.

Effect of the proximity to the 0°/90° interface on Energy Release Rate of fiber/matrix interface crack growth in the 90°-ply of a cross-ply laminate under tensile loading

2020 ◽  
Vol 54 (21) ◽  
pp. 3021-3034
Author(s):  
Luca Di Stasio ◽  
Janis Varna ◽  
Zoubir Ayadi
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Tensile Loading ◽  
Thickness Effect ◽  
Matrix Interface ◽  
Closure Technique ◽  
Geometric Configurations ◽  
Damage States ◽  
Fiber Matrix Interface

Models of Representative Volume Elements of cross-ply laminates with different geometric configurations and damage states are studied. Debond growth is characterized by the estimation of the Mode I and Mode II Energy Release Rate using the Virtual Crack Closure Technique. It is found that the presence of the [Formula: see text] interface and the thickness of the [Formula: see text] layer has no effect, apart from laminates with ultra-thin [Formula: see text] plies where it is however modest. The present analysis supports the claim that debond growth is not affected by the ply-thickness effect.

scholarly journals Energy release rate of fiber/matrix interface crack growth in cross-ply laminates under transverse loading: effect of the 0/90 interface and of 0 layer thickness

2019 ◽  
Author(s):  
Luca Di Stasio ◽  
Janis Varna ◽  
Zoubir Ayadi
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Thickness Effect ◽  
Matrix Interface ◽  
Transverse Loading ◽  
Closure Technique ◽  
Geometric Configurations ◽  
Damage States ◽  
Fiber Matrix Interface

Models of Representative Volume Elements (RVEs) of cross-ply laminates with different geometric configurations and damage states are studied. Debond growth is characterized by the estimation of the Mode I and Mode II Energy Release Rate (ERR) using the Virtual Crack Closure Technique (VCCT). It is found that the presence of the 0° /90° interface and the thickness of the 0° layer have no effect, apart from laminates with ultra-thin 90° plies where it is however modest. The present analysis supports the claim that debond growth is not affected by the ply-thickness effect.

Numerical Study on Adhesive Interface Reinforcement of Piezoelectric Composite under Impact Load

2011 ◽  
Vol 117-119 ◽  
pp. 849-857
Author(s):  
Rui Xiang Bai ◽  
Liang Wang
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Mechanical Load ◽  
Impact Load ◽  
Numerical Study ◽  
Piezoelectric Composite ◽  
Interfacial Toughness ◽  
Pull Out ◽  
Fiber Bridging

The interfacial reinforcement with interlaminar chopped fibers of piezoelectric composite under impact electro-mechanical load was studied using nonlinear finite element method. A meso- mechanical model based on the main toughness reinforcement mechanism of single fiber bridging and pull out was adopted, and then a tri-linear bridging law was obtained, while the interface chopped fibers by defining nonlinear bidirectional spring elements between coincident nodes on the two crack surfaces within bridging zone and the energy release rate was calculated using the virtual crack closure technique. The numerical investigation indicates that the interlaminar chopped fiber can effectively reduce the crack tip energy release rate whether the applied voltage is positive or negative, which was an effective technique improve the interfacial toughness of the piezoelectric composite adhesive structure.

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