@article{tarafdar_lin_naderi_wang_fu_hosein_wang_2024, title={UV-induced frontal polymerization for optimized in-situ curing of epoxy resin for excellent tensile and flexural properties}, url={https://doi.org/10.1016/j.coco.2024.101832}, DOI={10.1016/j.coco.2024.101832}, abstractNote={UV-induced frontal polymerization is an emergent rapid curing method for thermoset resin and its fiber composites which features the generation of a self-sustaining front that propagates within the entire material. This is different from using the commercially available UV curable resin which prohibited the curing of thermoset composites with opaque fibers (e.g., carbon fiber) due to the UV light being blocked by the fibers. In this study, we experimentally demonstrate that using the UV-induced frontal polymerization allows us to reduce the curing time of a standard tensile specimen of epoxy resin from traditionally 15 h using the oven curing method to only less than 1.5 min. The frontal polymerized epoxy specimens showed comparable and even superior tensile and flexural properties when compared to the traditional oven cured specimens. Moreover, we experimentally investigated the influence of the weight content of the photoinitiator, the UV light intensity, and the specimen geometry on the characteristics of the frontal polymerization process (i.e., front temperature, front velocity, and degree of cure) and the resulting tensile and flexural properties. The results and discussions are expected to provide guidance in scaling up this UV-induced frontal polymerization technique for the sustainable and additive manufacturing and repair of thermoset resin and its fiber composites.}, journal={Composites Communications}, author={Tarafdar, Amirreza and Lin, Wenhua and Naderi, Ali and Wang, Xinlu and Fu, Kun and Hosein, Ian D. and Wang, Yeqing}, year={2024}, month={Feb} }
 @article{naderi_quoc-thai_zhuang_jiang_2023, title={Vibration Analysis of a Unimorph Nanobeam with a Dielectric Layer of Both Flexoelectricity and Piezoelectricity}, volume={16}, ISSN={["1996-1944"]}, url={https://www.mdpi.com/1996-1944/16/9/3485}, DOI={10.3390/ma16093485}, abstractNote={In this study, for the first time, free and forced vibrational responses of a unimorph nanobeam consisting of a functionally graded base, along with a dielectric layer of both piezoelectricity and flexoelectricity, is investigated based on paradox-free local/nonlocal elasticity. The formulation and boundary conditions are attained by utilizing the energy method Hamilton’s principle. In order to set a comparison, the formulation of a model in the framework of differential nonlocal is first presented. An effective implementation of the generalized differential quadrature method (GDQM) is then utilized to solve higher-order partial differential equations. This method can be utilized to solve the complex equations whose analytic results are quite difficult to obtain. Lastly, the impact of various parameters is studied to characterize the vibrational behavior of the system. Additionally, the major impact of flexoelectricity compared to piezoelectricity on a small scale is exhibited. The results show that small-scale flexoelectricity, rather than piezoelectricity, is dominant in electromechanical coupling. One of the results that can be mentioned is that the beams with higher nonlocality have the higher voltage and displacement under the same excitation amplitude. The findings can be helpful for further theoretical as well as experimental studies in which dielectric material is used in smart structures.}, number={9}, journal={MATERIALS}, author={Naderi, Ali and Quoc-Thai, Tran and Zhuang, Xiaoying and Jiang, Xiaoning}, year={2023}, month={Apr} }
 @article{naderi_behdad_fakher_2022, title={Size dependent effects of two phase viscoelastic medium on damping vibrations of smart nanobeams: An efficient implementation of GDQM}, volume={31}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85126063212&partnerID=MN8TOARS}, DOI={10.1088/1361-665X/ac5456}, abstractNote={Abstract This paper studies the dynamics of nonlocal piezo-magnetic nanobeams (PMNBs) embedded in the local/nonlocal viscoelastic medium through the consistent and paradox-free model of the nonlocal theory. Besides, to perform the dynamic analysis, an exact solution and an efficient approach of generalized differential quadrature method (GDQM) are introduced. Since the size-dependency of the uniform loads is wrongly neglected by the nonlocal elasticity in differential form, the size-dependency of piezo-magnetic load is applied through the two-phase theory. Also, size dependency of the viscoelastic medium is accurately applied and examined through the solutions presented employing the differential two-phase theory and satisfying the constitutive boundary conditions. In this regard, the two-phase resultant equations of motions together with boundary conditions including the constitutive ones related to two-phase PMNB and the two-phase medium are attained. To confirm the credibility and efficiency of the extracted equations as well as presented solution procedures, several analogical studies are accomplished, and it is shown that the results obtained from the differential relations are reliable and consistence with those extracted from the integral nonlocal relations. It is shown that the present approach of the GDQM simplifies the solution procedures of the nonlocal problems and improves the precisions in the cases close to the pure nonlocal state. The presented results emphasize that the size-dependency of viscoelastic medium, external electric, and magnetic loads play significant roles on the vibration characteristics, and therefore it must be considered based on two-phase theory. The available results can be helpful to achieve an excellent design of smart nanobeams embedded in viscoelastic medium.}, number={4}, journal={Smart Materials and Structures}, author={Naderi, A. and Behdad, S. and Fakher, M.}, year={2022} }
 @article{behdad_fakher_naderi_hosseini-hashemi_2021, title={Vibrations of defected local/nonlocal nanobeams surrounded with two-phase Winkler–Pasternak medium: non-classic compatibility conditions and exact solution}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85105182418&partnerID=MN8TOARS}, DOI={10.1080/17455030.2021.1918796}, abstractNote={(2021). Vibrations of defected local/nonlocal nanobeams surrounded with two-phase Winkler–Pasternak medium: non-classic compatibility conditions and exact solution. Waves in Random and Complex Media. Ahead of Print.}, journal={Waves in Random and Complex Media}, author={Behdad, S. and Fakher, M. and Naderi, A. and Hosseini-Hashemi, S.}, year={2021} }
 @article{naderi_fakher_hosseini-hashemi_2021, title={On the local/nonlocal piezoelectric nanobeams: Vibration, buckling, and energy harvesting}, volume={151}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85096678496&partnerID=MN8TOARS}, DOI={10.1016/j.ymssp.2020.107432}, abstractNote={Based on a paradox-free nonlocal theory—two-phase local/nonlocal elasticity—vibration, buckling, and energy harvesting of piezoelectric nanobeams are investigated for the first time. By the means of the differential form of two-phase elasticity and Hamilton's principle, governing equations and boundary conditions are obtained. The exact solution as well as a numerical solution, Generalized Differential Quadrature Method (GDQM), are presented to extract results. Also, for the sake of obtaining equations for the forced vibration and energy harvesting analysis, the Galerkin method is utilized to discretize the governing equation. Given the fact that the differential nonlocal elasticity is not able to apply the size dependency on uniform loads, for the first time, the size-dependent piezoelectric load is taken into account through the two-phase elasticity. Also, vibration and energy harvesting of a clamped free nanobeam – which is a really good case for harvesting energy and cannot be accurately studied by differential nonlocal – are investigated employing the two-phase elasticity. To validate the present formulation and solution procedures, several comparison studies are conducted. Comparison between the common differential nonlocal elasticity and two-phase theory reveals that differential nonlocal elasticity is incompetent to yield reliable results for studying the vibration and energy harvesting of piezoelectric-based materials. Therefore, to study the mechanics of piezoelectric nano structures, other nonlocal theories such as two-phase local/nonlocal elasticity should be used. This paper can be a useful basis to investigate the vibration, buckling, and energy harvesting of nano piezoelectric devices and to improve their design.}, journal={Mechanical Systems and Signal Processing}, author={Naderi, A. and Fakher, M. and Hosseini-Hashemi, S.}, year={2021} }
 @article{naderi_behdad_fakher_hosseini-hashemi_2020, title={Vibration analysis of mass nanosensors with considering the axial-flexural coupling based on the two-phase local/nonlocal elasticity}, volume={145}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85084337229&partnerID=MN8TOARS}, DOI={10.1016/j.ymssp.2020.106931}, abstractNote={The influences of considering coupled axial-flexural vibrations on efficiency of cantilever mass nanosensors, modeled by Rayleigh and Timoshenko beam theories, are investigated in the frame work of a paradox-free nonlocal theory, i.e. two-phase local/nonlocal elasticity. However, the effects of axial-flexural coupling due to eccentricity of attached mass have been ignored in previous studies on mass nanosensors. Governing equations, boundary conditions, and corresponding compatibility conditions are derived by means of Hamilton’s principle and differential law of two-phase elasticity. Next, The Generalized Differential Quadrature Method (GDQM) as well as Generalized Integral Quadrature Method (GIQM) are utilized to attain the discretized two-phase formulation and coupled vibration characteristics of mass nanosensor. Several analogical studies are performed in detail to confirm the credibility of the present formulation and results. Comparisons between the uncoupled and coupled vibrations disclose that there are significant errors in obtaining the natural frequencies of corresponding mass value when the axial and transverse vibrations are considered separately. Therefore, the coupling of axial-lateral displacements resulted from the added mass eccentricity must be considered. This work can be a useful step forward to examine the coupling effects on vibration behavior of mass nanosensors, and it can be helpful to design the nanosensors with higher accuracy.}, journal={Mechanical Systems and Signal Processing}, author={Naderi, A. and Behdad, S. and Fakher, M. and Hosseini-Hashemi, S.}, year={2020} }
 @article{fakher_behdad_naderi_hosseini-hashemi_2020, title={Thermal vibration and buckling analysis of two-phase nanobeams embedded in size dependent elastic medium}, volume={171}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85077090096&partnerID=MN8TOARS}, DOI={10.1016/j.ijmecsci.2019.105381}, abstractNote={In this paper, vibration and buckling of two-phase nanobeams embedded in size dependent elastic medium and under thermal load are analyzed. Due to paradoxes of common differential nonlocal elasticity, such as neglecting the size effect of uniform loads, failure to satisfy the constitutive boundary conditions, associated to transformation of integral nonlocal equation to differential one, and incompatibility between the results of differential nonlocal with those of integral nonlocal, the size dependent effects of nanobeam, elastic medium and thermal load are taken into account simultaneously by using two-phase local/nonlocal Eringen's elasticity, for the first time. Governing equations and corresponding boundary conditions are derived using Hamilton's principle. To obtain natural vibration frequencies as well as critical buckling temperature, three different methods of solution are presented, i.e. exact solution, Generalized Differential Quadrature Method (GDQM) and Finite Element Method (FEM) which is based on the integral form of two-phase elasticity. Several comparison studies are conducted to examine the validity of the present formulation and results. The effects of applying two-phase elasticity on elastic medium and thermal load in vibration and buckling of nanobeams with different boundary conditions are investigated in details. Differences appeared in present results, especially in the cases with higher temperature and nonlocality as well as stiffer elastic medium, reveal that the size dependency of elastic medium and uniform thermal load, which is neglected by differential nonlocal, must be considered by employing two-phase elasticity.}, journal={International Journal of Mechanical Sciences}, author={Fakher, M. and Behdad, S. and Naderi, A. and Hosseini-Hashemi, S.}, year={2020} }