A modified model for simulation of mode I delamination growth in laminated composite materials

Shokrieh, M.M.; Daneshjoo, Z.; Fakoor, Mahdi

doi:10.1016/j.tafmec.2015.12.012

Cited by 40 publications

(8 citation statements)

References 28 publications

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“…However, the lack of reinforcement in the through-the-thickness direction makes them vulnerable to delamination, which is one of the most critical failure modes in laminated composites [1,2]. Therefore, several studies have been carried out to assess the delamination growth in composite structures [3][4][5][6]. In engineering problems, delamination growth in composites under mixed mode I/II loading is traditionally evaluated using the fracture mechanics parameters like the strain energy release rate (SERR).…”

Section: Introductionmentioning

confidence: 99%

Physics of delamination onset in unidirectional composite laminates under mixed-mode I/II loading

Daneshjoo

Shokrieh

Fakoor

et al. 2019

Engineering Fracture Mechanics

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A B S T R A C TIn order to understand the physics of the delamination onset in laminated composites, an experimental investigation of delamination growth is presented. The main objective of this paper is to demonstrate that delamination onset occurs at lower values than G c defined by the ASTM standards, and that the strain energy release rate level at which the crack growth onset occurs under any mixed mode I/II loading is governed by the critical strain energy density (SED) approach. Quasi-static delamination experiments have been performed under mode I, mode II and mixed mode I/II loadings. The value of the strain energy release rate at the observed crack onset and the angle of the initial crack growth were correlated with the SED theory to test the validity. The acoustic emission was also used to provide more insight into the physics of the delamination growth. The investigation shows that the onset of delamination growth occurs at the strain energy release rate levels predicted by the critical SED approach, and well before reaching the critical strain energy release rate determined via delamination tests following the ASTM standards. Moreover, results indicated that the predicted angle of the initial crack for delamination onset was in a good agreement with the experimental data. linearity (NL), the point at which the delamination growth is visually observed (VIS) or the intersection of a 5% offset line (5% Max).

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Section: Introductionmentioning

confidence: 99%

Physics of delamination onset in unidirectional composite laminates under mixed-mode I/II loading

Daneshjoo

Shokrieh

Fakoor

et al. 2019

Engineering Fracture Mechanics

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“…Alternative to these analytical relationships, current development of predictive capabilities seems primarily driven by the availability of finite element analysis codes, directing the model development towards the use of cohesive zone formulations [25,26], and more recently XFEM solutions based on these formulations [27,28]. Although generally accepted by the engineering community for providing easy and numerically robust analyses, these cohesive zone formulations, illustrated in Fig.…”

Section: Connecting Mode I Mode Ii and Mixed Mode I/ii Datamentioning

confidence: 99%

Development of a physics-based theory for mixed mode I/II delamination onset in orthotropic laminates

Daneshjoo

Amaral

Alderliesten

et al. 2019

Theoretical and Applied Fracture Mechanics

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This paper demonstrates how the critical strain energy density in the delamination tip vicinity may be used to explain the physics of delamination growth under mixed mode I/II. A theory previously proposed to physically relate mode I and mode II delamination growth is further extended towards describing the onset of mixed mode I/II delamination. Subsequently, data from the literature is used to demonstrate that this new concept of the critical strain energy density approach indeed explains, based on the physics of the problem, the strain energy release rate level at which crack onset occurs. This critical strain energy density for the onset of delamination appears to be independent of the opening mode. This means that, in order to characterize the fracture behaviour of a laminate, fracture tests at only one loading mode are necessary. Because the load level at which the physical delamination onset occurs at the microscopic level is much lower than the traditional engineering definition of macroscopic onset, further work must reveal the relationship between the macroscopically visible delamination onset, and the microscopic onset.

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“…They found that the CZM approach could predict the R‐curve very well. Shokrieh et al 15 suggested a modified model for the simulation of the Mode I delamination growth in laminated composite materials, which was called the multilinear CZM method. They utilized spring elements to consider the residual strength of the damaged material in the fracture process zone.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of carbon/epoxy laminated composites under various loading rates, comparing extended finite element method and cohesive zone modeling

Saeedi

Azadi

Mokhtarishirazabad

et al. 2020

Mat Design & Process Comms

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In this research, numerical simulations have been performed for carbon/epoxy laminated composites. Two methods were utilized: the extended finite element method and the cohesive zone modeling approach. In addition, experimental works were done according to the ASTM‐D5528 standard for double cantilever beam specimens under Mode I displacement‐controlled tensile loading. Besides, the loading rate was considered as 0.05, 0.5, 5, and 50 mm/min. During testing, a charge‐coupled device (CCD) camera was used to detect the crack length and the initial crack tip opening displacement by the digital image correlation technique. Experimental data were analyzed to find fracture properties by the compliance calibration method, the modified compliance calibration approach, and the modified beam theory. Consequently, there was a good adaptation between numerical and experimental results, obtained by the cohesive zone modeling approach and the extended finite element method, for predicting the maximum force, the energy release rate, and also the initial crack tip opening displacement, under different loading rates. Moreover, the results of the extended finite element method had higher errors than those of the cohesive zone modeling approach.

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A modified model for simulation of mode I delamination growth in laminated composite materials

Cited by 40 publications

References 28 publications

Physics of delamination onset in unidirectional composite laminates under mixed-mode I/II loading

Physics of delamination onset in unidirectional composite laminates under mixed-mode I/II loading

Development of a physics-based theory for mixed mode I/II delamination onset in orthotropic laminates

Numerical simulations of carbon/epoxy laminated composites under various loading rates, comparing extended finite element method and cohesive zone modeling

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