Delamination of Polymer Matrix Composites: Problems and Assessment

Pagano, N. J.; Schoeppner, G. A.

doi:10.1016/b0-08-042993-9/00073-5

Cited by 92 publications

(62 citation statements)

References 139 publications

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“…This kind of damage is not easily detected [3]. Hence, the separation of the two neighbouring layers has been described as the most feared failure mechanism in laminated composites [5]. Therefore, it is essential to understand the delamination behaviour in laminated composites.…”

Section: Introductionmentioning

confidence: 99%

Mixed-Mode Delamination Failures of Quasi-Isotropic Quasi- Homogeneous Carbon/Epoxy Laminated Composite

Johar¹,

Wong²,

Tamin³

2017

Failure Analysis and Prevention

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This chapter characterised the delamination behaviour of a quasi-isotropic quasi-homogeneous (QIQH) multidirectional carbon/epoxy-laminated composite. The delaminated surface constituted of 45 //0 layers. Specimens were tested using mode I double cantilever beam (DCB), mode II end-notched flexure (ENF) and mixed-mode I+II mixed-mode flexure (MMF) tests at constant crosshead speed of 1 mm/min. Results showed that the fracture toughness increased with the mode II component. Specifically, the mode I, mode II and mixed-mode I+II fracture toughness were 508.17, 1676.26 and 927.52 N/m, respectively. When the fracture toughness values were fitted using the Benzeggagh-Kenane (BK) criterion, it was found that the best-fit material parameter, η, was attained at 1.21. Furthermore, fibre bridging was observed in DCB specimens, where the steady-state fracture toughness was approximately 80% higher compared to the mode I fracture toughness. Finally, through scanning electron micrographs, it was found that there was resin-rich region at the crack tip of the specimens. In addition, fibre debonding of the 45 layer was found to be dominant in the DCB specimens. Significant shear cusps were noticed in the ENF specimens. As for the MMF specimens, matrix cracking and fibre debonding of the 0 layer were observed to be the major failure mechanisms.

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Section: Introductionmentioning

confidence: 99%

Mixed-Mode Delamination Failures of Quasi-Isotropic Quasi- Homogeneous Carbon/Epoxy Laminated Composite

Johar¹,

Wong²,

Tamin³

2017

Failure Analysis and Prevention

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“…Continuum damage mechanics approaches, which are based on material degradation models, have proved to be successful to predict different composite failure modes, including matrix cracking, delamination and fibre breakage Hinton et al (2004). However, major efforts have been focused on the treatment of delamination Pagano and Schoeppner (2000): two common approaches are the virtual crack closure technique (VCCT) Krueger (2004) and the cohesive zone models (CZMs) Camanho et al (2003); Lopes et al (2009). In parallel, numerous experimental studies dealing with composite damage detection have also been published.…”

Section: Introductionmentioning

confidence: 99%

Comparative experimental analysis of the effect caused by artificial and real induced damage in composite laminates

Pérez

Gil

Sánchez

et al. 2014

Composite Structures

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This paper presents the results of an extensive experimental campaign aimed to examine the effect upon the vibration response and on the residual load-bearing capacity caused by both: isolated artificially induced interlaminar damage and low-velocity impact induced damage in composite laminates. The experimental programme included modal testing, drop-weight impact testing, ultrasonic inspection, transverse quasi-static loading testing and compression testing conducted on a set of 72 carbon fibre-reinforced composite laminated coupons. Both types of damage caused measurable changes in laminate performance, however marked divergent trends were observed. The results allowed for conclusions to be drawn regarding the adequacy of the artificial damage approach and highlighted the importance and role of other forms of degradation upon damage tolerance of laminated composites containing damage.

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“…This aspect must be considered for designing and maintaining the integrity of load carrying structures (Pagano & Schoeppner, 2000). In this regard, we should also note that polymer matrix composites are given primary attention because of their importance and dominance in practical structural applications as well as the composite literature itself.…”

Section: Introductionmentioning

confidence: 99%

Using Acoustic Emission to Evaluate Fracture Toughness Energy Release Rate (GI) at Mode I Delamination of Composite Materials

Oskouei¹,

Zucchelli²,

Ahmadi³

et al. 2012

Acoustic Emission

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Delamination of Polymer Matrix Composites: Problems and Assessment

Cited by 92 publications

References 139 publications

Mixed-Mode Delamination Failures of Quasi-Isotropic Quasi- Homogeneous Carbon/Epoxy Laminated Composite

Mixed-Mode Delamination Failures of Quasi-Isotropic Quasi- Homogeneous Carbon/Epoxy Laminated Composite

Comparative experimental analysis of the effect caused by artificial and real induced damage in composite laminates

Using Acoustic Emission to Evaluate Fracture Toughness Energy Release Rate (GI) at Mode I Delamination of Composite Materials

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