Mixed mode fracture toughness of GFRP composites

Dharmawan, F.; Simpson, G.; Herszberg, Israel; John, Sabu

doi:10.1016/j.compstruct.2006.04.020

Cited by 74 publications

(49 citation statements)

References 11 publications

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“…Nevertheless, a preliminary investigation was conducted to examine the changes in the derived fracture energy values when the lever weight correction factor is included and results showed that there was minimal (less than 1%) increase in the derived fracture energy values. This phenomenon was also observed in similar experimental studies conducted by other researchers [21].…”

Section: Considerations For Correction Factors and Non-linearity Effectssupporting

confidence: 77%

Cohesive Fracture Study of a Bonded Coarse Silica Sand Aggregate Bond Interface Subjected to Mixed-Mode Bending Conditions

Chen

El‐Hacha

2013

Polymers

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Abstract:One of the primary objectives in the design of composite structures is the prevention of premature bond failure. Therefore, the characterization of cohesive behavior is an important field of study in structural engineering. Using fracture mechanics principles, the cohesive behavior of an epoxy bonded coarse silica sand aggregate bond interface is studied in this paper, with a focus on finding a general analytical form of idealizing its behavior when used in a specimen possessing asymmetric and inhomogeneous qualities. Two series of small-scale specimens were experimentally tested under mixed-mode bending (MMB) conditions, where it was found that there was negligible influence exerted on the fracture energy of the interface due to changes in the mixed-mode ratio or initial crack length. Using finite element analysis (FEA) methods, an appropriate bilinear traction-separation model was developed to both validate as well as obtain a set of consistent parameters applicable to all tested specimens. Comparison of the Global Method and the Local Method, used to obtain partitioned Mode I and Mode II fracture energy values from MMB specimens, were made, with the conclusion that both methods are adequate in the calculation of the total fracture energy though the Local Method should be used to obtain accurate partitioned Mode I and Mode II fracture energy values. Idealization of the bond interface using the cohesive parameters derived can be accurately achieved by the use of both contact interactions and cohesive elements in two-dimensional and three-dimensional FE models, though the results obtained using contact interactions would be expected to exhibit greater global stiffness.

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Section: Considerations For Correction Factors and Non-linearity Effectssupporting

confidence: 77%

Cohesive Fracture Study of a Bonded Coarse Silica Sand Aggregate Bond Interface Subjected to Mixed-Mode Bending Conditions

Chen

El‐Hacha

2013

Polymers

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“…Furthermore, MMB test method was recently used for investigation of crack propagation in adhesively bonded joints by Ben Salem et al (2014). Researchers like Verma et al (1995) and Dharmawan et al (2006) evaluated the fracture toughness of composite materials by using DCB, ENF and MMB specimens. However, for all these test methods there are problems in that a wide range of mixed-mode ratios cannot be tested which limits their usefulness (Reeder and Crews 1990).…”

Section: Introductionmentioning

confidence: 99%

3D Characterization of Mixed-Mode Fracture Toughness of Materials Using a New Loading Device

Oskui

Choupani

Shameli

2016

Lat. Am. j. solids struct.

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In this paper, a new loading device was employed to conduct a mixed-mode fracture test. Therefore, disadvantages detected in the previous mixed-mode fracture toughness test methods can be avoided. The new fixture has perfect symmetry which provides a uniform stress state, creates the pure plane strain conditions and eliminates the unwanted mode-III loading conditions. The values of non-dimensional stress intensity factors for pure mode-I, pure mode-II, and pure mode-III were obtained using 3D models of new loading device and modified Arcan method in order to compare the results and investigate the variation of fracture parameters. Furthermore, the values of correction factors for pure mode-III in various loading angles were studied for both fixtures and it was resulted that in modified Arcan device there was a larger contribution of unwanted third mode loading conditions and therefore the values of mode-I and mode-II non-dimensional stress intensity factors were affected. In the present study, in order to compare the results, the fracture toughness values of ABS (Acrylonitrile butadiene styrene) polymeric material were determined experimentally for both fixtures and a full range of mixed-mode loading conditions including pure mode-I and pure mode-II loading were created and tested. The differences in critical stress intensity factors of the fixtures were found about 7.00% and 42.65% in mode-I and mode-II loading conditions, respectively. ness for three modes of loading (I, II and III) and also under mixed-mode loading conditions. Some of these methods include: the double cantilever beam (DCB) and the end notched flexure (ENF) specimens have been employed for mode-I and mode II tests, respectively (Davidson et al. 2012, Shokrieh and Heidari 2011, Zacharopoulos 2004. A crack rail shear (CRS) specimen has been proposed to determine the mode-III (tearing) critical strain energy release rate by Becht and Jr (1988). The mixed-mode bending (MMB) test has been proposed by combining the schemes used for DCB and ENF tests, which can produce a wide range of the ratios of mode-I and mode-II components by varying the lever arm of the specimen. A modified MMB test method was used for evaluation of the interlaminar fracture toughness of AS4/PEEK composite material by Reeder (1990), Reeder and Crews (1990). Furthermore, MMB test method was recently used for investigation of crack propagation in adhesively bonded joints by Ben Salem et al. (2014). Researchers like Verma et al. (1995) and Dharmawan et al. (2006) evaluated the fracture toughness of composite materials by using DCB, ENF and MMB specimens. However, for all these test methods there are problems in that a wide range of mixed-mode ratios cannot be tested which limits their usefulness (Reeder and Crews 1990). But in order to obtain reliable results for interlaminar fracture toughness for pure mode-I, pure mode-II, and mixed-mode loading conditions, different beam type specimens would be required. It is therefore necessary to develop other test methods to eval...

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“…1c) and mixed-mode bending (MMB) method for mixed-mode (Fig. 1d), have been used to estimate the fracture toughness of different materials [5][6][7][8][9][10][11][12].…”

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confidence: 99%

Experimental and Numerical Investigation of Mixed-Mode Interlaminar Fracture of Carbon-Polyester Laminated Woven Composite by Using Arcan Set-up

2011

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Composite materials are widely used in marine, aerospace and automobile industries. These materials are often subjected to defects and damages from both in-service and manufacturing process. Delamination is the most important of these defects. This paper reports investigation of mixed-mode fracture toughness in carbon-polyester composite by using numerical and experimental methods. All tests were performed by Arcan set-up. By changing the loading angle, α, from 0°to 90°at 15°intervals, mode-I, mixed-mode and mode-II fracture data were obtained. Correction factors for various conditions were obtained by using ABAQUS software. Effects of the crack length and the loading angle on fracture were also studied. The interaction j-integral method was used to separate the mixed-mode stress intensity factors at the crack tip under different loading conditions. As the result, it can be seen that the shearing mode interlaminar fracture toughness is larger than the opening mode interlaminar fracture toughness. This means that interlaminar cracked specimen is tougher in shear loading condition and weaker in tensile loading condition.

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Mixed mode fracture toughness of GFRP composites

Cited by 74 publications

References 11 publications

Cohesive Fracture Study of a Bonded Coarse Silica Sand Aggregate Bond Interface Subjected to Mixed-Mode Bending Conditions

Cohesive Fracture Study of a Bonded Coarse Silica Sand Aggregate Bond Interface Subjected to Mixed-Mode Bending Conditions

3D Characterization of Mixed-Mode Fracture Toughness of Materials Using a New Loading Device

Experimental and Numerical Investigation of Mixed-Mode Interlaminar Fracture of Carbon-Polyester Laminated Woven Composite by Using Arcan Set-up

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