A Simple Fracture Mechanical Model for Predicting Tensile Strength of an SMC Composite

Ogi, Keiji; Yamanouchi, Masahiro

doi:10.6089/jscm.36.198

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…i) Area A with the initial damage (depth h), generated near the central line on the tensile side surface, does not bear load. Instead, intact area B bears the additional load [8,9]. ii) The neutral axis does not move, due to initial damage.…”

Section: Fracture Mechanics Modelmentioning

confidence: 98%

“…9, the strength ratio is plotted against the location of the initial damage δ, varying from 0 to L/2. Here it is rational that the initial delamination size a is almost equal to the initial damage size (0:4 h 0:9mm) [8]. Thus, the strength ratio was calculated for a= 0.40 mm and 0.90 mm, using Eq.…”

Section: Verification Of the Modelmentioning

confidence: 99%

“…The flexural strength using Eq. (12) together with a= 0.5 mm and G C ¼ 600J=m 2 [8,13] is depicted in Fig. 10.…”

Section: Verification Of the Modelmentioning

confidence: 99%

“…In general, predicting the strength of SMC is more difficult than predicting that of laminates, because the fracture process is complicated due to irregular microscopic structures, and the scatter of strength is large since the size of initial damage, contributing to fracture, has large variation. Recently, the authors [8] proposed a simple model for predicting the tensile strength of CF-SMC, based on fracture mechanics, by modifying the model for unidirectional arrayed chopped strands (UACSs) [9,10]. It was demonstrated that the strength of CF-SMC depends on the size of initial damage, which is mainly ascribed to the size of the chopped strands.…”

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confidence: 99%

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Temperature Dependence of Flexural Strength of a CF-SMC Composite

Ogi

Yamanouchi

2010

Appl Compos Mater

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This paper presents the temperature dependence of predicting the flexural strength of a carbon fiber-reinforced sheet molding compound (CF-SMC). First, three-point flexural tests were performed to measure strength and elastic modulus at a variety of temperatures for CF-SMC specimens. Next, simple equations for predicting flexural strength were derived based on the fracture mechanics approach. The predicted flexural strength was in reasonably good agreement with the experiment results. The scatter of flexural strength was ascribed to the variation of location and size of the initial damage. In addition, the effect of temperature on flexural strength and delamination behavior was explained in association with the temperature dependence of the elastic modulus and fracture toughness.

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Section: Fracture Mechanics Modelmentioning

confidence: 98%

Section: Verification Of the Modelmentioning

confidence: 99%

“…The flexural strength using Eq. (12) together with a= 0.5 mm and G C ¼ 600J=m 2 [8,13] is depicted in Fig. 10.…”

Section: Verification Of the Modelmentioning

confidence: 99%

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confidence: 99%

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Temperature Dependence of Flexural Strength of a CF-SMC Composite

Ogi

Yamanouchi

2010

Appl Compos Mater

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“…Whereas, the grains in the RA250502500753 panel are 0.25-mm thick and consist of 0.25 mm single elementary ply. Existing studies on chopped-tape and discontinuous staggered inclusions reinforced composites showed that the strength of these type of composites is toughness-based [42][43][44]. A simplified expression of the strength, σ c , is given by the toughness-based criterion in (Equation ( 2)) where Ec is the composite's modulus, Gc the mode II interlaminar fracture toughness, H the specimen's thickness and h an initial damage size [43].…”

Section: Effect Of Grain and Elementary Ply Thicknessmentioning

confidence: 99%

Mechanical Properties of Compression Moulded Aggregate-Reinforced Thermoplastic Composite Scrap

2021

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Recycling of thermoplastic composites has drawn a considerable attention in the recent years. However, the main issue with recycled composites is their inferior mechanical properties compared to the virgin ones. In this present study, an alternative route to the traditional mechanical recycling technique of thermoplastic composites has been investigated with the view to increase mechanical properties of the recycled parts. In this regard, the glass/polypropylene laminate offcuts are cut in different grain sizes and processed in bulk form, using compression moulding. Further, the effect of different grain sizes (i.e., different lengths, widths and thicknesses) and other process-related parameters (such as mould coverage) on the tensile properties of recycled aggregate-reinforced composites have been investigated. The tensile properties of all composite samples are tested according to ISO 527-4 test method and the significance of test results is evaluated according to Student’s t-test and Fisher’s F-test respectively. It is observed that the tensile moduli of the recycled panels are close to the equivalent quasi-isotropic continuous fibre-reinforced reference laminate while there is a noteworthy difference in the strengths of the recycled composites. At this stage, the manufactured recycled composites show potential for stiffness-driven application.

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