Evaluation of Interlaminar Damage and Crack Propagation through Digital Image Correlation Method

Constantinescu, Dan Mihai; Sandu, Marin; Marsavina, Liviu; Negru, Radu; Miron, Matei Constantin; Apostol, Dragos Alexandru

doi:10.4028/www.scientific.net/KEM.399.105

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Impact Fatigue of Adhesive Joints
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Multiscale Modelling of Damage Processes in Polycrystalline Ceramic Porous Composites
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The Effect of Geometry and Material Properties on the Load Capacity of Single-Strapped Adhesive Bonded Joints
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Behaviour Analysis of Adhesive Joints Used in Ship Structures
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Evaluation of Interlaminar Damage and Crack Propagation through Digital Image Correlation Method
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Experimental and Numerical Analysis of Buckling Behaviour of the Ship Plates Made of Composite Materials
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Polyurethane Foams Behaviour. Experiments versus Modeling
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Investigations Regarding the Thermoplastic Resistance Evaluation with Simulated Imperfections
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A Pull-Shear Test for Debonding of FRP- Laminates for Concrete Structures
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HomeKey Engineering MaterialsAdvances in Strength of MaterialsEvaluation of Interlaminar Damage and Crack...

Evaluation of Interlaminar Damage and Crack Propagation through Digital Image Correlation Method

Abstract:

Interface damage characterization and interlaminar failure of sandwich specimens with two initial interlaminar defects (inserts) is done by using the digital image correlation method. Mode I tests reveal interesting particularities on damage localization and unstable crack propagation. After analyzing the experimentally obtained results, we propose as a failure parameter the local strain at the crack tip or, alternatively, the crack tip opening displacement which quantifies the non-linear phenomena.

Info:

Periodical:

Key Engineering Materials (Volume 399)

Main Theme:

Advances in Strength of Materials

Edited by:

Liviu MARSAVINA

Pages:

105-112

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.399.105

Citation:

D. M. Constantinescu et al., "Evaluation of Interlaminar Damage and Crack Propagation through Digital Image Correlation Method", Key Engineering Materials, Vol. 399, pp. 105-112, 2009

Online since:

October 2008

Authors:

Dan Mihai Constantinescu, Marin Sandu, Liviu Marsavina, Radu Negru, Matei Constantin Miron, Dragos Alexandru Apostol

Keywords:

Crack Propagation, Digital Image Correlation (DIC), Local Damage, Sandwich Composite

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$41.00

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References

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[2] ASTM D 5528 - 94a, Standard test method for mode I interlaminar fracture toughness of unidirectional fibre-reinforced polymer matrix composites, Annual Book of ASTM Standards, 100 Barr Harbor Drive, West Conshohocken, PA 19428, USA, Vol. 15. 03 (2001).

DOI: https://doi.org/10.1520/d6671-01

[3] T.K. O'Brien: Composites-Part B, Vol. 29, pp.57-62 (1998).

[4] Fracture Mechanics Testing Methods for Polymers, Adhesives and Composites, edited by D.R. Moore, A. Pavan, and J.G. Williams, ESIS Publication 28, Elsevier (2001).

[5] P. Robinson and D.Q. Song: Journal of Composite Materials, Vol. 26, pp.1554-1577 (1992).

[6] D.M. Constantinescu, N. Constantin and T. Goss, in: Proceedings of the 20th Danubia-Adria Symposium on Experimental Methods in Solid Mechanics, September 24-27, Györ, Scientific Society of Mechanical Engineering, ISBN 963 9058 20 3, Hungary, pp.82-83 (2003).

[7] D.M. Constantinescu, N. Constantin and T. Goss: The Archive of Mechanical Engineering, Vol. LI (4), pp.565-580 (2004).

[8] D.M. Constantinescu, M. Sandu, L. Marsavina., Elvira Alexandrescu., A. Haja, M. Stere , R. Negru., D. Apostol. and M. Miron, in: CEEX 2007 Conference Excellence Research - A Way to E.R.A. - edited by N. Vasiliu and L. Szabolcs, pp.202-6, ISSN 1843-5904 (2007).

[9] Information on http: /www. gom. com.

[10] D.M. Constantinescu, D. Apostol and M. Miron, in: The 13th International Conference of Fracture Mechanics, November 1-3, Bacau, MOCM 13, Volume 4 - Romanian Technical Sciences Academy, pp.53-56, ISSN 1224-7480 (2007).

[11] M. Miron, Evaluation of interface properties and damage characterization of layered and sandwich composites, Diploma of Engineer Thesis, University POLITEHNICA of Bucharest (2008).

Paper TitlePages

Modeling Interlaminar Shear Crack-Jump Phenomenon in Fiber-Reinforced Polymer Composites

Authors: S.S.R. Koloor, Majid R. Ayatollahi, M.N. Tamin

Abstract: This paper discusses the simulation technique for the development of a validated finite element model to capture the stable shear crack-jump phenomenon in carbon fiber-reinforced polymer composite laminates. The interlaminar cracking process is characterized using a 16-ply unidirectional ([0]₁₆) end-notch flexure (ENF) specimens. Complementary FE models of the test setup are developed to capture the mechanics of the observed interlaminar crack-jump phenomenon. The cohesive interface response is represented by a damage model with bilinear traction-displacement softening law. Close comparison of measured and FE-predicted load-central deflection response of the beam specimen serves to validate the FE model for the stable shear crack-jump. FE simulation predicts an early onset of damage at the interlaminar crack front corresponding to 13.4 pct. of the maximum deflection at fracture. The mechanism of stable crack-jump is described by the characteristic evolution of the interface damage parameter, and quantified by the damage dissipation energy.

Generation of Crack Growth Resistance Curve from ENF Specimens Made of Glass/Epoxy: An Experimental Study

Authors: V. Alfred Franklin, T. Christopher

Abstract: This article examines the fracture toughness of end notched flexure (ENF) composite specimens of three different lay-ups. Experiments were conducted on these glass/epoxy specimens and the critical fracture energy,, was evaluated based on compliance based beam method (CBBM). Classical methods require crack length measurements, which are not easy to obtain as propagation occurs rapidly without a clear opening. The CBBM is based on crack equivalent concept, which does not require crack length monitoring during propagation and hence the crack growth resistance curve (R-curve) can be generated in a much easier way. Moreover, the CBBM accounts the non-negligible energy dissipation in the fracture process zone (FPZ) in addition to stress concentrations near crack tip, contact between specimen arms at the pre-crack region and root rotation effects. Hence, the complete R-curves of ENF specimens of different lay-ups were obtained using the CBBM with higher degree of accuracy. It was observed that the unidirectional specimen did show higher propagation toughness value than the angle-ply and cross-ply specimens.

335

Measurements of Mode I Interlaminar Properties of Carbon Fiber Reinforced Polymers Using Digital Image Correlation

Authors: Matthias Merzkirch, Louise Ahure Powell, Tim Foecke

Abstract: Numerical models based on cohesive zones are usually used to model and simulate the mechanical behavior of laminated carbon fiber reinforced polymers (CFRP) in automotive and aerospace applications and require different interlaminar properties. The current work focuses on determining the interlaminar fracture toughness (G_I_C) under Mode I loading of a double cantilever beam (DCB) specimen of unidirectional CFRP, serving as prototypical material. The novelty of this investigation is the improvement of the testing methodology by introducing digital image correlation (DIC) as an extensometer and this tool allows for crack growth measurement, phenomenological visualization and quantification of various material responses to Mode I loading. Multiple methodologies from different international standards and other common techniques are compared for the determination of the evolution of G_I_C as crack resistance curves (R-curves). The primarily metrological sources of uncertainty, in contrast to material specific related uncertainties, are discussed through a simple sensitivity analysis. Additionally, the current work offers a detailed insight into the constraints and assumptions to allow exploration of different methods for the determination of material properties using the DIC measured data. The main aim is an improvement of the measurement technique and an increase in the reliability of measured data during static testing, in advance of future rate dependent testing for crashworthiness simulations.

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