Constitutive modeling for mechanical behavior of PMMA microcellular foams

Jo, Choonghee; Fu, Jun; Naguib, Hani E.

doi:10.1016/j.polymer.2005.09.054

Cited by 44 publications

(17 citation statements)

References 20 publications

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“…This behaviour makes it challenging to describe the whole flow curves. Different constitutive material models were suggested to describe such flow curves [6,7,40]. The authors examined various models; the most suitable one capable of describing various hardening and softening stages of the flow curves is the constitutive material model after Nasraoui et al [2].…”

Section: Three-point Bending Testmentioning

confidence: 99%

Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling

2017

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b s t r a c tAn experimental study of temperature-dependent mechanical behaviour of Poly-methyl methacrylate (PMMA) was performed at a range of temperatures (20 C, 40 C, 60 C and 80 C) below its glass transition point (108 C) under uniaxial tension and three-point bending loading conditions. This study was accompanied by simulations aimed at identification of material parameters for two different constitutive material models. Experimental flow curves obtained for PMMA were used in elasto-plastic analysis, while a sim-flow optimization tool was employed for a two-layer viscoplasticity model. The temperature increase significantly affected mechanical behaviour of PMMA, with quasi-brittle fracture at room temperature and super-plastic behaviour (ε>110%) at 80 C. The two-layer viscoplasticity material model was found to agree better with the experimental data obtained for uniaxial tension than the elasto-plastic description.

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Section: Three-point Bending Testmentioning

confidence: 99%

Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling

2017

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“…Then, the 0.5, 1.0, and 2.0 wt% are converted to 0.331, 0.663, and 1.331 vol%, respectively, where the specific gravities 1.77 for C20A and 1.17 for PMMA were used. The time constant is a material property which is determined by experiments [52]. For plotting Figure 5b and 40 were used for 0, 0.5, 1.0, and 2.0 wt% of clay composites, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In the previous work [52], a constitutive model using an equivalent elastic modulus was proposed for nonlinear elastic behavior of polymeric materials. If the equivalent elastic modulus of the nanocomposite containing the effect of the nanoparticles is determined, it can be applied for the constitutive equation of the nanocomposite materials.…”

Section: Constitutive Equation For Pmma/clay Nanocomposite Foamsmentioning

confidence: 99%

“…If the equivalent elastic modulus of the nanocomposite containing the effect of the nanoparticles is determined, it can be applied for the constitutive equation of the nanocomposite materials. For tensile behavior of PMMA/clay nanocomposites, the constitutive equation based on the viscoelastic behavior was adapted since the constitutive model has well described the elastic behavior of PMMA [52]. Therefore, the constitutive equation for PMMA/clay nanocomposites can be expressed using the overall modulus E c obtained in the previous section,…”

Section: Constitutive Equation For Pmma/clay Nanocomposite Foamsmentioning

confidence: 99%

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Constitutive modeling for intercalated PMMA/clay nanocomposite foams

Naguib

2006

Polymer Engineering & Sci

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A constitutive model for tensile behavior of PMMA/clay nanocomposite foams was developed in this study. The elastic modulus of the nanocomposites is affected by the form of clays embedded in the polymer matrix. The reinforcing effect by intercalation of the clays and the detrimental effect by clay agglomeration were considered for the determination of the elastic modulus of the nanocomposites. A viscoelastic model was adapted for the tensile behavior of the material. The developed constitutive equation is expressed in terms of clay morphology and material properties. The aspect ratio of clays and the expansion of clay layer spacing in the intercalated clay clusters were proved to play a vital role in the reinforcing mechanism. For the verification of the constitutive model, Poly(methyl-methacrylate) (PMMA)/clay nanocomposite foams were manufactured by batch process method and their uniaxial tensile test results were compared with theoretical predictions. Compared with the experimental results, the proposed constitutive equation showed agreement with the experimental test results.

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“…01047-p.4 In the study focused on the constitutive equation in initial region of PMMA foam, similar expression is used [13]. Where, a is constant.…”

Section: Constitutive Equationmentioning

confidence: 99%

The compressive behaviour and constitutive equation of polyimide foam in wide strain rate and temperature

Yoshimoto

Kobayashi

Horikawa

et al. 2015

EPJ Web of Conferences

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Abstract. These days, polymer foams, such as polyurethane foam and polystyrene foam, are used in various situations as a thermal insulator or shock absorber. In general, however, their strength is insufficient in high temperature environments because of their low glass transition temperature. Polyimide is a polymer which has a higher glass transition temperature and high strength. Its mechanical properties do not vary greatly, even in low temperature environments. Therefore, polyimide foam is expected to be used in the aerospace industry. Thus, the constitutive equation of polyimide foam that can be applied across a wide range of strain rates and ambient temperature is very useful. In this study, a series of compression tests at various strain rates, from 10 −3 to 10 3 s −1 were carried out in order to examine the effect of strain rate on the compressive properties of polyimide foam. The flow stress of polyimide foam increased rapidly at dynamic strain rates. The effect of ambient temperature on the properties of polyimide foam was also investigated at temperature from −190• C to 270• C. The flow stress decreased with increasing temperature.

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Constitutive modeling for mechanical behavior of PMMA microcellular foams

Cited by 44 publications

References 20 publications

Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling

Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling

Constitutive modeling for intercalated PMMA/clay nanocomposite foams

The compressive behaviour and constitutive equation of polyimide foam in wide strain rate and temperature

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