... nanoindentation technique with a sharp indenter tip. Nanoindentation was used to characterize the mechanical response with emphasis on dynamic mechanical properties of polymer coatings enclosed in a high-temperature stage. To verify the method, the viscoelastic properties of a reference polyethylene terephthalate...

...Nomesh Kumar; Badri Prasad Patel; V. Venkateswara Rao; B. S. Subhashchandran In this paper, the finite strain viscoelastic constitutive model for particulate composite solid propellants is proposed considering strain rate, large deformation/large strain, thermorheological behavior, stress softening...

... , “ A Micromechanical Finite Element Model for Linear and Damage-Coupled Viscoelastic Behaviour of Asphalt Mixture ,” Int. J. Numer. Analyt. Meth. Geomech. , 30 ( 11 ), pp. 1135 – 1158 . 10.1002/nag.520 [5] Kim , Y. , Allen , D. H. , and Little , D. N. , 2007 , “ Computational Constitutive Model...

... (δ), between the displacement and applied force in an oscillatory nanoindentation test was measured for both neat and magnetically annealed systems through which the effect of low magnetic fields on the viscoelastic properties of the epoxy was invoked. The comparison of the creep strain rate...

... dynamics method nanocomposites nanoindentation nanostructured materials polymers viscoelasticity X-ray diffraction Advancement on modeling, microstructure characterization, property measurement, and processing in polymer based advanced materials raised interest to integrated computational...

...Ardeshir H. Tehrani; Rashid K. Abu Al-Rub In this study, damage evolution in a nanocomposite containing the polymethyl methacrylate polymer (PMMA) embedded with silicate nanoclay particles is simulated by using a nonlinear viscoelastic, viscoplastic, and viscodamage constitutive model...

...F. Addiego; J. Di Martino; D. Ruch; A. Dahoun; O. Godard; S. Patlazhan Cavitation-induced deformation mechanisms in neat semicrystalline polymers, i.e., crazing, and in the derived composites, i.e., particle-matrix debonding, are generally activated during the transition between viscoelastic...

...Kamel Hizoum; Yves Rémond; Stanislav Patlazhan The peculiarities of viscoelastic behavior of high-density polyethylene (HDPE) subjected to the uniaxial cyclic tensions and retractions below the yield point are studied. This required using three different deformation programs including (i...

... performed on the glass/epoxy laminated composites having several fiber orientations, 0 deg, 45 deg, and 90 deg, to calibrate the elastic and viscoelastic properties of the fibers and matrix. Three-point bending creep tests at elevated temperature ( 80 ° C ) were then carried out for a number of control...

...N. V. David; X.-L. Gao; J. Q. Zheng The stress relaxation behavior of a Twaron CT709 ® fabric/natural rubber composite under a uniaxial constant strain is studied using three viscoelasticity models with different levels of complexity and a newly developed para-rheological model. The three...

... to the determination of the material properties of an air plasma sprayed alumina-titania blend ceramic to which a viscoelastic material has been added by vacuum infiltration. Tests were conducted at both room and elevated temperatures. Material properties obtained from specimens with three coating thicknesses...

... the effective material moduli of a viscoelastic material containing multicoated spherical inclusions displaying elastic or viscoelastic behavior. Losses are taken into account by introducing the frequency-dependent complex stiffness tensors of the viscoelastic matrix and the multicoated inclusions...

... reducing agent. When viscoelastic nonlinearity is considered such contradictory effect is played by stress itself, in which case an initial stress may have a beneficial effect. 11 10 2005 14 07 2006 viscoelasticity thermomechanical treatment internal stresses composite materials...

... experiments have been conducted to characterize the TPO and to verify the modeling approach ( Wang, Y., 2002, Ph.D. thesis, The University of Michigan, Ann Arbor, MI ). The model includes a quantitative rate-dependent Young’s modulus, a nonlinear viscoelastic response between initial linear elastic response...

...Erik Marklund; Janis Varna; Lennart Wallström In tensile tests the flax/polypropylene composites clearly show nonlinear behavior in loading and hysteresis loops in unloading. In creep tests performed at different load levels the response was nonlinear viscoelastic, and after recovery, viscoplastic...

...Ozgen U. Colak; Necmi Dusunceli The viscoelastic and viscoplastic behaviors of high density polyethylene (HDPE) under uniaxial monotonic and cyclic loading are modeled using the modified viscoplasticity theory based on overstress (VBO). The viscoelastic modeling capabilities of the modified VBO...

...Fernand Ellyin; Zihui Xia A nonlinear viscoelastic constitutive model, in differential form, is presented based on the deformation characteristics of thermoset polymers under complex loadings. This rheological model includes a criterion to delineate loading and unloading in multiaxial stress states...

...K. M. B. Jansen Viscoelastic relaxation curves of thermoset resins may change considerably for relatively small changes in properties of the initial monomer mixture or final conversion level. In order to be able to predict the effect of such changes, a model is proposed which relates the properties...

... material data and analysis tools for their industry specific materials. The viscoelastic response of bolted aluminum joints used in the small die-cast engine industry at elevated temperatures was studied. Bolt load-loss tests were performed using strain gages in situ. It was found that after a week...

... and theoretical techniques follow those established in previous research into the rate-dependent mechanical behavior of amorphous homopolymers over a wide range of strain rates. On the experimental side, dynamic mechanical analysis tension tests were used to characterize the viscoelastic behavior...