Experimental Investigation of Strain Rate and Temperature Dependent Response of an Epoxy Resin Undergoing Large Deformation

Tamrakar, Sandeep; Ganesh, Raja; Sockalingam, Subramani; Haque, Bazle Z.; Gillespie, John W.

doi:10.1007/s40870-018-0144-8

Cited by 34 publications

(28 citation statements)

References 43 publications

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“…Then, at a temperature range from 40 to 60 °C, the moduli decreased rapidly. Finally, the sharp decrease was followed by almost constant E ′ and G ′ values, as reported in other studies . It is known that the melting point of PEG4000 is approximately 43 °C .…”

Section: Resultssupporting

confidence: 83%

Dynamic tensile and shear storage moduli of PEG/silica‐polymorph composites

Fauziyah

Hilmi

Fadly

et al. 2018

J of Applied Polymer Sci

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The effect of silica polymorphs on the thermomechanical properties of 0, 5, 10, and 20 wt % silica particles-reinforced-based poly(ethylene glycol) (PEG) composites have been studied as a function of temperature using dynamic mechanical analysis (DMA). The silica polymorphs exhibited quartz (Q), cristobalite (C), and amorphous (A) phases, which were obtained by processing natural silica sand. The DMA thermomechanical properties were determined in tensile (E) and shear (G) modes. The maximum storage moduli (E 0 and G 0 ) were achieved by samples with 20 wt % silica for all type of fillers. These values increased approximately 12 times for PEG/Q, 10 times for PEG/A, and 11 times for PEG/C composites compared to the pure PEG. Furthermore, the Poisson's ratio values of the composites were filler phase dependent, that is, 0.39-0.47 for PEG/Q, 0.15-0.18 for PEG/A, and somewhat anomalous for PEG/C composites.

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Section: Resultssupporting

confidence: 83%

Dynamic tensile and shear storage moduli of PEG/silica‐polymorph composites

Fauziyah

Hilmi

Fadly

et al. 2018

J of Applied Polymer Sci

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“…More details regarding experimental setup and specimen design are presented in our previous work. 39 True stress-strain response for strain rates 0.001-1/s is presented in Figure 3(a). The overall trend of the stress-strain response is similar for all four strain rates-initial increase in stress is observed until the yield point is reached, which is followed by strain softening and plastic flow.…”

Section: Determination Of Model Parametersmentioning

confidence: 99%

“…In our previous work, 39 compressive properties of epoxy resin DER 353 were experimentally characterized under high strain rate over large strains at a wide range of temperatures. DER 353 is an epoxy manufactured by Dow Chemical Company and is mixed with PACM-20 curing agent (Air Products and Chemicals, Inc.) at stoichiometric ratio of 100:28 (weight ratio).…”

Section: Introductionmentioning

confidence: 99%

Strain rate-dependent large deformation inelastic behavior of an epoxy resin

Tamrakar

Ganesh

Sockalingam

et al. 2019

Journal of Composite Materials

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The objective of this paper is to model high strain rate and temperature-dependent response of an epoxy resin (DER 353 and bis( p-aminocyclohexyl) methane (PACM-20)) undergoing large inelastic strains under uniaxial compression. The model is decomposed into two regimes defined by the rate and temperature-dependent yield stress. Prior to yield, the model accounts for viscoelastic behavior. Post yield inelastic response incorporates the effects of strain rate and temperature including thermal softening caused by internal heat generation. The yield stress is dependent on both temperature and strain rate and is described by the Ree–Erying equation. Key experiments over the strain rate range of 0.001–12,000/s are conducted using an Instron testing machine and a split Hopkinson pressure bar. The effects of temperature (25–120 ℃) on yield stress are studied at low strain rates (0.001–0.1/s). Stress-relaxation tests are also carried out under various applied strain rates and temperatures to obtain characteristic relaxation time and equilibrium stress. The model is in excellent agreement over a wide range of strain rates and temperatures including temperature in the range of the glass transition. Case studies for a wide range of monotonic and varying strain rates and large strains are included to illustrate the capabilities of the model.

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“…Explicit modeling of fiber fracture, [22][23][24][25][26] fiber-matrix interface debonding, 27 and matrix plasticity 19 are considered in this model. Considering the computational cost, the fiber segments length of l FS ¼ 5 mm with unique part ID is chosen to model each fiber.…”

Section: D Micromechanical Finite Element Modeling Of Unidirectionalmentioning

confidence: 99%

“…Elastic-plastic material properties used in this 2D punch shear model are presented in Table 3. 19 Modeling fiber fracture using zero-thickness cohesive elements…”

Section: D Micromechanical Finite Element Modeling Of Unidirectionalmentioning

confidence: 99%

Stochastic micromechanical modeling of transverse punch shear damage behavior of unidirectional composites

Haque

Ali

Ganesh

et al. 2018

Journal of Composite Materials

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Punch shear in unidirectional composites is induced by transverse shear loading that progressively perforates the laminate within a narrow shear annulus. At lower micromechanical length scales, punch shear loading creates unique micromechanical damage mechanisms dominated by transverse fiber shear failure, fiber-matrix interphase debonding and large inelastic deformation and cracking of the matrix. A new punch shear experimental method has been developed to test unidirectional S glass/DER353 epoxy composite ribbons at sub-millimeter length scale. The experimental data consist of a statistical measurement of the continuum response (load-deformation and punch shear strength) and the characterization of micromechanical damage modes. A simplified 2D micromechanical finite element model incorporating Weibull fiber strength distribution has been developed and correlated with the experimental data. The 2D micromechanical finite element model can simulate the punch shear failure of the ribbon incorporating mixed mode fiber fracture, and fiber-matrix debonding mechanisms using zero thickness cohesive elements. Results from stochastic simulations of punch shear experiments show that an equivalent 2D micromechanical finite element model can predict the micromechanical damage mechanisms and the statistical distribution of punch shear strength of the continuum with favorable correlation with the experiments. This paper presents a combined experimental and computational approach in simulating the stochastic non-linear progressive punch shear behavior of unidirectional composites for the first time in the literature.

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Experimental Investigation of Strain Rate and Temperature Dependent Response of an Epoxy Resin Undergoing Large Deformation

Cited by 34 publications

References 43 publications

Dynamic tensile and shear storage moduli of PEG/silica‐polymorph composites

Dynamic tensile and shear storage moduli of PEG/silica‐polymorph composites

Strain rate-dependent large deformation inelastic behavior of an epoxy resin

Stochastic micromechanical modeling of transverse punch shear damage behavior of unidirectional composites

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