Nonlinear Viscoelastic Characterization of FM‐73 Adhesive

Peretz, D.; Weitsman, Y.

doi:10.1122/1.549666

Cited by 64 publications

(15 citation statements)

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“…FE analysis was performed for FM-73 adhesive systems under creep and recovery tests. Their results compared very well with the experimental data performed by Perez and Weitsman [4]. Roy and Reddy [5] used a similar integration approach to Henriksen's and formulated a numerical integration method for the Schapery non-linear viscoelastic model coupled with moisture sorption and used for 2D FE modelling of adhesively bonded joints.…”

Section: Introductionmentioning

confidence: 63%

Numerical finite element formulation of the Schapery non‐linear viscoelastic material model

Haj-Ali

Muliana

2003

Numerical Meth Engineering

191

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SUMMARYThis study presents a numerical integration method for the non-linear viscoelastic behaviour of isotropic materials and structures. The Schapery's three-dimensional (3D) non-linear viscoelastic material model is integrated within a displacement-based ÿnite element (FE) environment. The deviatoric and volumetric responses are decoupled and the strain vector is decomposed into instantaneous and hereditary parts. The hereditary strains are updated at the end of each time increment using a recursive formulation. The constitutive equations are expressed in an incremental form for each time step, assuming a constant incremental strain rate. A new iterative procedure with predictor-corrector type steps is combined with the recursive integration method. A general polynomial form for the parameters of the non-linear Schapery model is proposed. The consistent algorithmic tangent sti ness matrix is realized and used to enhance convergence and help achieve a correct convergent state. Veriÿcations of the proposed numerical formulation are performed and compared with a previous work using experimental data for a glassy amorphous polymer PMMA.

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Section: Introductionmentioning

confidence: 63%

Numerical finite element formulation of the Schapery non‐linear viscoelastic material model

Haj-Ali

Muliana

2003

Numerical Meth Engineering

191

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“…Following established procedures, 23,24 it was possible to express the creep and recovery data obtained within the linear range in a power-law form as follows:…”

Section: Modeling Nonlinear Viscoelastic Model-characterizationmentioning

confidence: 99%

Some aspects of the mechanical response of BMI 5250‐4 neat resin at 191°C: Experiment and modeling

Ruggles‐Wrenn

Balaconis

2007

J of Applied Polymer Sci

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ABSTRACT:The inelastic deformation behavior of BMI-5250-4 neat resin, a high-temperature polymer, was investigated at 1918C. The effects of loading rate on monotonic stress-strain behavior as well as the effect of prior stress rate on creep behavior were explored. Positive nonlinear rate sensitivity was observed in monotonic loading. Creep response was found to be significantly influenced by prior stress rate. Effect of loading history on creep was studied in stepwise creep tests, where specimens were subjected to a constant stress rate loading followed by unloading to zero stress with intermittent creep periods during both loading and unloading. The strain-time behavior was strongly influenced by prior deformation history. Negative creep was observed on the unloading path. In addition, the behavior of the material was characterized in terms of a nonlinear viscoelastic model by means of creep and recovery tests at 1918C. The model was employed to predict the response of the material under monotonic loading/unloading and multi-step load histories.

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“…This assumption is valid when the configuration of the polymers' molecular structures is not affected by temperature changes such that the instantaneous elastic and long-term material properties are independent on temperatures. When the polymers' molecular structures significantly change as their thermal environment is altered, the materials are classified as TCM, e.g., Cohen (1980, 2004), Peretz and Weitsman (1983), Harper and Weitsman (1985), Wineman and Rajagopal (2001), and Tschoegl et al (2002).…”

Section: Introductionmentioning

confidence: 98%

A multi-scale framework for layered composites with thermo-rheologically complex behaviors

Muliana

Haj-Ali

2008

International Journal of Solids and Structures

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A multi-scale modeling framework is proposed for generating the effective nonlinear thermo-viscoelastic responses of multi-layered and thick-section composites. The modeling framework is demonstrated for multi-layered composite systems consisting of two alternating fiber-reinforced polymeric layers: unidirectional fiber (roving) and continuous filament mat (CFM). The viscoelastic behavior of the polymeric matrix is considered as stress-dependent and thermo-rheologically complex. Two simplified 3D micromechanical models with periodic boundary conditions are formulated for the roving and CFM. In addition, a sublaminate model is developed for the 3D effective homogenized through-thickness response of the roving and CFM layers. This framework provides an effective time-dependent material response while simultaneously recognizing the corresponding deformation at the microconstituents under overall thermo-mechanical loadings at the macro-level. Stress correction algorithms are developed at each scale to enhance computational efficiency and accuracy. Short-term (30 min) creep tests on off-axis multi-layered specimens are also conducted under combined stresses and temperatures to calibrate in-situ fiber and matrix properties and verify the predictions of the multi-scale framework. A timeshifting method is applied to create long-term material behaviors from the available short-term creep data. Verification of the multi-scale material framework is also done for the overall long-term responses. Finally, long-term structural analyses under thermo-mechanical loadings are conducted by integrating the multi-scale material framework to finite element (FE) structural analyses.

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Nonlinear Viscoelastic Characterization of FM‐73 Adhesive

Cited by 64 publications

References 0 publications

Numerical finite element formulation of the Schapery non‐linear viscoelastic material model

Numerical finite element formulation of the Schapery non‐linear viscoelastic material model

Some aspects of the mechanical response of BMI 5250‐4 neat resin at 191°C: Experiment and modeling

A multi-scale framework for layered composites with thermo-rheologically complex behaviors

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