Adhesive joints in composite laminates—A combined numerical/experimental estimate of critical energy release rates

The characterization of critical energy release rates of adhesive joints in laminated composite structures is a key issue when failure analyses have to be performed. Critical energy release rates, or fracture toughnesses, are known to be dependent on the mode mixing ratio, i.e. the portion of shear...

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Veröffentlicht in:International journal of adhesion and adhesives 2012-01, Vol.32, p.23-38
Hauptverfasser: Balzani, C., Wagner, W., Wilckens, D., Degenhardt, R., Büsing, S., Reimerdes, H.-G.
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container_end_page 38
container_issue
container_start_page 23
container_title International journal of adhesion and adhesives
container_volume 32
creator Balzani, C.
Wagner, W.
Wilckens, D.
Degenhardt, R.
Büsing, S.
Reimerdes, H.-G.
description The characterization of critical energy release rates of adhesive joints in laminated composite structures is a key issue when failure analyses have to be performed. Critical energy release rates, or fracture toughnesses, are known to be dependent on the mode mixing ratio, i.e. the portion of shear loading. It is thus useful to determine a criterion which gives the critical energy release rate as a function of the mode mixing ratio, which is the overall goal of this paper. For this purpose several experiments have been performed, for single mode I, single mode II, and mixed mode I/II loading conditions with pre-defined mode mixing ratios. Unfortunately, most of the experimental outcome cannot be used directly for least squares fitting of suitable fracture toughness criteria due to a couple of reasons, which will be discussed in detail. Hence, a numerical approach based on cohesive interface elements is employed to determine some of the critical energy release rates by fitting against experimental load–deformation curves. This combined numerical/experimental approach yields a useful database of discrete critical energy release rate values. These are utilized to fit suitable criteria which then allow the calculation of critical energy release rates for any given mode mixing ratio. The results are discussed in terms of convergence to the discrete values and physical plausibility, and a simple possibility to include mode III behavior is presented.
doi_str_mv 10.1016/j.ijadhadh.2011.09.002
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Critical energy release rates, or fracture toughnesses, are known to be dependent on the mode mixing ratio, i.e. the portion of shear loading. It is thus useful to determine a criterion which gives the critical energy release rate as a function of the mode mixing ratio, which is the overall goal of this paper. For this purpose several experiments have been performed, for single mode I, single mode II, and mixed mode I/II loading conditions with pre-defined mode mixing ratios. Unfortunately, most of the experimental outcome cannot be used directly for least squares fitting of suitable fracture toughness criteria due to a couple of reasons, which will be discussed in detail. Hence, a numerical approach based on cohesive interface elements is employed to determine some of the critical energy release rates by fitting against experimental load–deformation curves. This combined numerical/experimental approach yields a useful database of discrete critical energy release rate values. 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subjects Adhesive joint
Adhesive joints
Application fields
Applied sciences
Cohesive interface element
Composite laminate
Criteria
Critical energy release rate
Energy release rate
Exact sciences and technology
Fittings
Fracture toughness
Material characterization
Mathematical analysis
Mixing ratios
Polymer industry, paints, wood
Technology of polymers
title Adhesive joints in composite laminates—A combined numerical/experimental estimate of critical energy release rates
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