Measurement of cohesive laws for interlaminar failure of CFRP
Source abstract
Abstract
Abstract For carbon fibre reinforced composites, two different delamination processes are identified; one at the crack-tip with a sub millimetre sized process zone and one with a large-scale process zone associated with fibre bridging. In the present paper we focus on the crack-tip process that is important when studying initiation of cracks and when crack growth has to be avoided. Methods to measure the cohesive laws associated with the fracture processes are developed for loading in mode I and II using the DCB- and ENF-specimens. An evaluation method involving finite element simulations and an optimization procedure is proposed and verified. Experiments performed on a CFRP are evaluated using the proposed method. For loading in mode I, the fracture energy and cohesive strength are in the order of 300 J/m2 and 75 MPa, respectively. The corresponding values for mode II loading are 1200 J/m2 and 80 MPa.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Mechanical Behavior of Composites · Structural Behavior of Reinforced Concrete · Fatigue and fracture mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. Bridging tractions in mode I delamination: measurements and simulations10.1016/j.compscitech.2007.08.024 ↗
2. The mathematical theory of equilibrium cracks in brittle fracture10.1016/S0065-2156(08)70121-2 ↗
3. Analysis of crack formation in concrete by means of fracture mechanics and finite elements10.1016/0008-8846(76)90007-7 ↗
4. Fracture analysis of notched composites10.1016/0045-7949(81)90119-X ↗
5. Fracture mechanics and damage mechanics – a combined approach
6. Stigh U. Initiation and growth of an interface crack. In: Mechanical behaviour of adhesive joints. Paris, France: Pluralis, 1987.
7. A continuum model for void nucleation by inclusion debonding10.1115/1.3173064 ↗
8. An experimental method to determine the complete stress-elongation relation for a structural adhesive layer loaded in peel
9. Mixed-mode fracture analysis of plastically-deforming adhesive joints10.1023/A:1010869706996 ↗
10. Cohesive law and notch sensitivity of adhesive joints10.1016/S1359-6454(01)00404-9 ↗
11. The stress-elongation relation for an adhesive layer loaded in peel using equilibrium of energetic forces10.1016/j.ijsolstr.2003.09.039 ↗
12. Mixed-mode cohesive-zone models for fracture of an adhesive bonded polymer–matrix composite10.1016/j.engfracmech.2005.07.004 ↗
13. Shear behaviour of adhesive layers10.1016/j.ijsolstr.2006.04.036 ↗
14. Constitutive behaviour of mixed mode loaded adhesive layer10.1016/j.ijsolstr.2007.06.014 ↗
15. Direct extraction of rate-dependent traction–separation laws for polyurea/steel interfaces10.1016/j.ijsolstr.2008.08.019 ↗
16. Large-scale bridging in composites: R-curves and bridging laws10.1016/S1359-835X(98)00025-6 ↗
17. Determination of mixed mode cohesive laws10.1016/j.engfracmech.2006.04.006 ↗
18. Characterizing delamination of fibre composites by mixed mode cohesive laws10.1016/j.compscitech.2008.11.025 ↗
19. Modeling of composite fracture using cohesive zone and bridging models10.1016/j.compscitech.2005.10.013 ↗
20. Vibration-based inverse algorithms for detection of delamination in composites10.1016/j.compstruct.2013.03.012 ↗
21. Delamination detection in composites through guided wave field image processing10.1016/j.compscitech.2011.04.011 ↗
22. Modelling discrete failures in composites with interface elements10.1016/j.compositesa.2010.02.011 ↗
23. A path independent integral and the approximative analysis of strain concentration by notches and cracks10.1115/1.3601206 ↗
24. Nilsson F. Fracture mechanics from theory to applications. Stockholm, Sweden: Department of Solid Mechanics, KTH; 2001.
25. Delamination R-curve phenomena due to damage10.1016/0022-5096(92)90198-B ↗
26. The role of material orthotropy in fracture specimens for composites10.1016/0020-7683(92)90138-J ↗
27. An engineering solution for mesh size effects in the simulation of delamination using cohesive zone models10.1016/j.engfracmech.2006.08.025 ↗
28. Abaqus 6.11-2. Dassault Systemes Simulia Corp. Rising Sun Mills, 166 Valley Street, Providence, RI 02909-2499, USA.
29. ASTM Standard D 6415/D 6415M. Standard test method for measuring the curved beam strength of a fiber-reinforced polymer–matrix composite; 2006.
30. ASTM Standard D 2344/D 2344M. Standard test method for short-beam strength of polymer matrix composite materials and their laminates; 2006.
31. ASTM Standard D 5379/D 5379M. Standard test method for shear properties of composite materials by the v-notched beam method; 2005.
32. Contact finite analysis of three- and four-point short-beam bending of unidirectional composites10.1016/0266-3538(92)90047-7 ↗
33. Nonlinear shear behavior and interlaminar shear strength of unidirectional polymer matrix composites: A numerical study10.1016/j.ijsolstr.2013.12.014 ↗
34. Methods for assessment of interlaminar tensile strength of composite materials
35. Numerical investigation into failure of laminated composite T-piece specimens under tensile loading10.1016/j.compositesa.2012.02.010 ↗
36. Four-point bend interlaminar shear testing of uni- and multi-directional carbon/epoxy composite systems10.1016/S1359-835X(03)00204-5 ↗