Investigation of push-out delamination using cohesive zone modelling and acoustic emission technique

Saeedifar, Milad; Fotouhi, Mohamad; Najafabadi, Mehdi Ahmadi

doi:10.1177/0021998315622983

Cited by 8 publications

(3 citation statements)

References 67 publications

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“…By tuning a and b parameters independently, we can consider limiting cases such as pure tangential sliding (i.e., b = 0, Du n = 0) [38][39][40]. The displacement jump condition is identical to the elastic part of the cohesive zone models considered in several FEA studies [41][42][43].…”

Section: Single Inclusion Problem In the Presence Of Interfacial Damagementioning

confidence: 99%

Applicability of the interface spring model for micromechanical analyses with interfacial imperfections to predict the modified exterior Eshelby tensor and effective modulus

Lee¹,

Kim

Lee

et al. 2019

Mathematics and Mechanics of Solids

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Closed-form solutions for the modified exterior Eshelby tensor, strain concentration tensor, and effective moduli of particle-reinforced composites are presented when the interfacial damage is modeled as a linear spring layer of vanishing thickness; the solutions are validated against finite element analyses. Based on the closed-form solutions, the applicability of the interface spring model is tested by calculating those quantities using finite element analysis (FEA) augmented with a matrix-inhomogeneity non-overlapping condition. The results indicate that the interface spring model reasonably captures the characteristics of the stress distribution and effective moduli of composites, despite its well-known problem of unphysical overlapping between the matrix and inhomogeneity. external strain, , to the average internal strain field inside the inhomogeneity, , as , : , where , is the interior strain concentration tensor and is given in terms of the interior Eshelby tensor, , , and elastic stiffness tensors, and , of the matrix and the inhomogeneity, respectively 8 . Hence, given the importance of the Eshelby tensor, a primary focus of recent research has been the derivation of the simplified form of , for various material properties and geometries of the inclusion 9-11 .The strain field of the matrix around the inclusion has also been studied because the strain field outside of the inclusion plays a critical role in determining the mechanical properties beyond the elastic response regime. It is also important for considering composites with high reinforcement volume fractions, in which the interaction among the reinforcements becomes important. The non-uniform strain field at a position in the matrix can be expressed with a similar form as , : * , where the superscript "Ext" refers to the exterior, and , is the exterior Eshelby tensor 12, 13 . The exterior Eshelby tensor and the exterior strain concentration tensor, , , have been used to consider the shear localization of metallic glass, the matrix failure point for reinforced composites, and the interaction among the reinforcements [14][15][16] .Further progress on the inclusion or inhomogeneity problem has been achieved by considering the interfacial damage present in realistic composites where debonding or slip between the matrix and inclusion can occur. As a simplified model of interfacial imperfection, J. Qu introduced a linear-spring layer of vanishing thickness at the interface to represent the displacement jump between the inclusion and the matrix 17, 18 . Zero and infinite interfacial spring compliance correspond to perfect and completely damaged (i.e., no load transfer between the matrix and the inclusion) interfaces, respectively. Owing to its mathematical simplicity and easier physical interpretation (compared to the interface stress model 19,20 and the interphase model 21,22 ), the interface spring model has been widely adopted to describe composites with an imperfect interface 17,18,[23][24][25][26] . In earlier studies, the modified interior Eshelb...

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Section: Single Inclusion Problem In the Presence Of Interfacial Damagementioning

confidence: 99%

Applicability of the interface spring model for micromechanical analyses with interfacial imperfections to predict the modified exterior Eshelby tensor and effective modulus

Lee¹,

Kim

Lee

et al. 2019

Mathematics and Mechanics of Solids

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“…Fuente 12 Esquema de tipos de delaminación en procesos de taladrado de materiales compuestos reforzados con fibras. Imagen adaptada de [39] . .…”

Section: Lista De Figurasunclassified

“…FIGURA 2.12: Esquema de tipos de delaminación en procesos de taladrado de materiales compuestos reforzados con fibras. Imagen adaptada de [39] Además, en el taladrado de CFRP, se producen otro tipo de defectos, como fibras sin cortar, también llamado flacking, daños en la calidad superficial del interior del agujero, o degradación térmica [40].…”

Section: Maquinabilidadunclassified

Combined analysis of wear mechanisms and delamination in CFRP drilling

Fernández-Pérez

Díaz-Álvarez

Miguélez

et al. 2021

Composite Structures

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Drilling operations have a huge impact of time and cost on aircraft structures manufacturing and assembly processes, owing to the big volume of mechanical joints used, the complexity of the machining operation and the quality standards required.In this industry, composite materials are used extensively, mainly, Carbon Fiber Reinforced Plastics (CFRPs), which stand out by their excellent specific mechanical properties and good fatigue and corrosion resistance. The material removal process is characterized by intermittent fracture of the fibers and oscillation of the cutting forces. Furthermore, the drill bits suffer a severe tool wear produced by the abrasiveness and hardness of the carbon fibers.A mi familia, por encima de todo, siempre. GRACIAS xiii Contenidos publicados y presentadosAquí se recoge una lista de artículos u otras contribuciones que han sido incluidas como parte de la tesis. Todo el material de estas fuentes incluido en el documento está señalado por medios tipográficos y una referencia explícita. Publicaciones indexadas • J. Fernández-Pérez et al. "Influence of cutting parameters on tool wear and hole quality in composite aerospace components drilling". In: Composite Structures 178 (2017), pp. 157-161.

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On the improvement of analytical delamination model for drilling of laminated composites using Galerkin method

Shahri

Najafabadi

Akhlaghi

2020

Composites Part B: Engineering

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Investigation of push-out delamination using cohesive zone modelling and acoustic emission technique

Cited by 8 publications

References 67 publications

Applicability of the interface spring model for micromechanical analyses with interfacial imperfections to predict the modified exterior Eshelby tensor and effective modulus

Applicability of the interface spring model for micromechanical analyses with interfacial imperfections to predict the modified exterior Eshelby tensor and effective modulus

Combined analysis of wear mechanisms and delamination in CFRP drilling

On the improvement of analytical delamination model for drilling of laminated composites using Galerkin method

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