Pub Date : 2016-02-09DOI: 10.1061/(ASCE)NM.2153-5477.0000104
L. Dormieux, E. Lemarchand, S. Brisard
AbstractClassical micromechanics approaches for heterogeneous media assume perfect bonding between phases, implying that both displacement and stress vectors are continuous across the interface between the phases. When nanoinclusions are involved, a stress vector discontinuity in the local equilibrium has to be accounted for. In this framework, this paper derives an approximate solution of the Lippmann-Schwinger (L-S) equation, which accounts for these surface stresses. This approach suggests introducing the concept of an equivalent particle that combines the particle with the surrounding interface, which can be directly implemented in any standard homogenization procedure, such as the Mori-Tanaka scheme. Analytical expressions for the stiffness tensor of the equivalent particle is derived for spheroidal inclusions, accounting for a wide range of nanoinclusion shapes and dimensions. Finally, an energy-based analysis proves how the dramatic increase of the elastic properties is controlled, for a given volu...
{"title":"Equivalent Inclusion Approach for Micromechanics Estimates of Nanocomposite Elastic Properties","authors":"L. Dormieux, E. Lemarchand, S. Brisard","doi":"10.1061/(ASCE)NM.2153-5477.0000104","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000104","url":null,"abstract":"AbstractClassical micromechanics approaches for heterogeneous media assume perfect bonding between phases, implying that both displacement and stress vectors are continuous across the interface between the phases. When nanoinclusions are involved, a stress vector discontinuity in the local equilibrium has to be accounted for. In this framework, this paper derives an approximate solution of the Lippmann-Schwinger (L-S) equation, which accounts for these surface stresses. This approach suggests introducing the concept of an equivalent particle that combines the particle with the surrounding interface, which can be directly implemented in any standard homogenization procedure, such as the Mori-Tanaka scheme. Analytical expressions for the stiffness tensor of the equivalent particle is derived for spheroidal inclusions, accounting for a wide range of nanoinclusion shapes and dimensions. Finally, an energy-based analysis proves how the dramatic increase of the elastic properties is controlled, for a given volu...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"6 1","pages":"04016002"},"PeriodicalIF":0.0,"publicationDate":"2016-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58479401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1061/(ASCE)NM.2153-5477.0000102
M. Vandamme, Z. Bažant, S. Keten
AbstractA variety of geomaterials, such as cementitious or clay-based materials, has on the nano-scale a layered microstructure that can contain fluid in its nano-porous space. The creep of such nano-scale basic units is what causes the macroscopic creep. Here, one nano-pore whose walls consist of two parallel infinite solid layers interacting through Lennard-Jones potential is studied. The authors evaluate numerically the energy barriers that such a system needs to overcome for the two solid layers to slide over each other and show how this sliding depends on the longitudinal and transverse forces applied to the layers. The energy barriers translate into a dependence of the apparent viscosity of the system on the disjoining pressure in a manner consistent with the microprestress theory. This result makes it possible to explain why the longtime creep of cementitious materials is logarithmic. The experimental data on how the long-term logarithmic creep of cementitious materials depends on the temperature a...
{"title":"Creep of Lubricated Layered Nano-Porous Solids and Application To Cementitious Materials","authors":"M. Vandamme, Z. Bažant, S. Keten","doi":"10.1061/(ASCE)NM.2153-5477.0000102","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000102","url":null,"abstract":"AbstractA variety of geomaterials, such as cementitious or clay-based materials, has on the nano-scale a layered microstructure that can contain fluid in its nano-porous space. The creep of such nano-scale basic units is what causes the macroscopic creep. Here, one nano-pore whose walls consist of two parallel infinite solid layers interacting through Lennard-Jones potential is studied. The authors evaluate numerically the energy barriers that such a system needs to overcome for the two solid layers to slide over each other and show how this sliding depends on the longitudinal and transverse forces applied to the layers. The energy barriers translate into a dependence of the apparent viscosity of the system on the disjoining pressure in a manner consistent with the microprestress theory. This result makes it possible to explain why the longtime creep of cementitious materials is logarithmic. The experimental data on how the long-term logarithmic creep of cementitious materials depends on the temperature a...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":"04015002"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58479367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-02DOI: 10.1061/(ASCE)NM.2153-5477.0000108
L. Cai, A. Al-ostaz, Xiaobing Li, L. Drzal, Brian P. Rook, A. Cheng, H. Alkhateb
AbstractOne-layer (0.15-mm-thick) and 15-layer (5.43-mm-thick) graphene composites have been fabricated through the impregnation of epoxy resin into porous graphene nanoplatelet (GnP) paper. Three different flake sizes of GnPs were used for the 1-layer graphene composites: 5 μm, mixed 5 μm and 25 μm, and 25 μm. The largest graphene flakes showed the best material properties in terms of tensile strength and elongation at break. Both tensile and dynamic mechanical analysis (DMA) test results demonstrated that the 15-layer graphene composite had better material properties than the 1-layer graphene composites. The storage modulus of 15-layer graphene composite was 170% higher than that of neat epoxy. The transverse surface of 15-layer graphene composite exhibited a higher elastic modulus but lower hardness than the top surface. Ballistic limit test results showed that the combination of polyurea (PU) and a 15-layer graphene composite coating can increase the ballistic limit of TC-128 steel plate slightly.
{"title":"Processing and Mechanical Properties Investigation of Epoxy-Impregnated Graphene Paper","authors":"L. Cai, A. Al-ostaz, Xiaobing Li, L. Drzal, Brian P. Rook, A. Cheng, H. Alkhateb","doi":"10.1061/(ASCE)NM.2153-5477.0000108","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000108","url":null,"abstract":"AbstractOne-layer (0.15-mm-thick) and 15-layer (5.43-mm-thick) graphene composites have been fabricated through the impregnation of epoxy resin into porous graphene nanoplatelet (GnP) paper. Three different flake sizes of GnPs were used for the 1-layer graphene composites: 5 μm, mixed 5 μm and 25 μm, and 25 μm. The largest graphene flakes showed the best material properties in terms of tensile strength and elongation at break. Both tensile and dynamic mechanical analysis (DMA) test results demonstrated that the 15-layer graphene composite had better material properties than the 1-layer graphene composites. The storage modulus of 15-layer graphene composite was 170% higher than that of neat epoxy. The transverse surface of 15-layer graphene composite exhibited a higher elastic modulus but lower hardness than the top surface. Ballistic limit test results showed that the combination of polyurea (PU) and a 15-layer graphene composite coating can increase the ballistic limit of TC-128 steel plate slightly.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"12 1","pages":"04016005"},"PeriodicalIF":0.0,"publicationDate":"2015-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58479031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-09-01DOI: 10.1061/(ASCE)NM.2153-5477.0000098
Kunpeng Lin, E. Law, S. Pang
AbstractMetal matrix nanocomposites (MMNCs) show significant promise for use as structural and/or functional materials. In recent years, discrete dislocation simulations have been used to perform a numerical analysis on MMNCs. Although the trend of increasing flow stress and degree of hardening with a larger particle volume fraction and decreasing particle size were captured by existing simulations, the effects of these parameters on the mechanical behavior of MMNCs shown in these analyses were not as substantial as those reported in experiments. Meanwhile, the presence of thermally induced dislocations and chemical reactions between the matrix and inclusions suggest that interphase regions should be accounted for in the simulation. By using a level set in the extended FEM (XFEM), interphase regions are introduced into the numerical model. The effects of elastic properties, thickness of the interphase regions, and resistance to dislocation motion within the interphase regions are examined in this study.
{"title":"Effects of Interphase Regions of Particulate-Reinforced Metal Matrix Nanocomposites Using a Discrete Dislocation Plasticity Model","authors":"Kunpeng Lin, E. Law, S. Pang","doi":"10.1061/(ASCE)NM.2153-5477.0000098","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000098","url":null,"abstract":"AbstractMetal matrix nanocomposites (MMNCs) show significant promise for use as structural and/or functional materials. In recent years, discrete dislocation simulations have been used to perform a numerical analysis on MMNCs. Although the trend of increasing flow stress and degree of hardening with a larger particle volume fraction and decreasing particle size were captured by existing simulations, the effects of these parameters on the mechanical behavior of MMNCs shown in these analyses were not as substantial as those reported in experiments. Meanwhile, the presence of thermally induced dislocations and chemical reactions between the matrix and inclusions suggest that interphase regions should be accounted for in the simulation. By using a level set in the extended FEM (XFEM), interphase regions are introduced into the numerical model. The effects of elastic properties, thickness of the interphase regions, and resistance to dislocation motion within the interphase regions are examined in this study.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"99 1","pages":"04014002"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000098","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58479255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-09-01DOI: 10.1061/(ASCE)NM.2153-5477.0000097
Maged Sidhom, L. Dormieux, E. Lemarchand
AbstractMany research activities have contributed to extend the homogenization schemes and variational bounds to account for surface stresses, in the case of matrix-inclusion composite materials. The nanostructure of clay-based and cement-based materials rather exhibits a disordered granular-like morphology which is usually well described by using the self-consistent scheme. Within this context, this paper proposes an extension of Kroener’s self-consistent scheme incorporating the physics of surface stress. The poromechanical coupling is also considered through the concept of disjoining pressure. Closed-form solutions for the homogenized elastic and poroelastic moduli that are derived and simplified expressions of these moduli are reported for asymptotic cases.
{"title":"Poroelastic Properties of a Nanoporous Granular Material with Interface Effects","authors":"Maged Sidhom, L. Dormieux, E. Lemarchand","doi":"10.1061/(ASCE)NM.2153-5477.0000097","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000097","url":null,"abstract":"AbstractMany research activities have contributed to extend the homogenization schemes and variational bounds to account for surface stresses, in the case of matrix-inclusion composite materials. The nanostructure of clay-based and cement-based materials rather exhibits a disordered granular-like morphology which is usually well described by using the self-consistent scheme. Within this context, this paper proposes an extension of Kroener’s self-consistent scheme incorporating the physics of surface stress. The poromechanical coupling is also considered through the concept of disjoining pressure. Closed-form solutions for the homogenized elastic and poroelastic moduli that are derived and simplified expressions of these moduli are reported for asymptotic cases.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":"04014001"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000097","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58479188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-07-06DOI: 10.1061/(ASCE)NM.2153-5477.0000101
Yanbiao Chu, T. Ragab, P. Gautreau, C. Basaran
AbstractUniaxial tension of chiral graphene nanoribbons (GNR) with and without edge hydrogen passivation are simulated using molecular dynamics (MD) simulations to study their mechanical properties. The results demonstrate that hydrogen saturation generally weakens chiral GNRs, although its influence on armchair GNRs is almost negligible. Mechanical properties of GNRs depend on chiral angles. Zigzag GNRs (chiral angle 0°) are always the strongest, whereas armchair GNRs (chiral angle 30°) are weaker. The mechanical properties of other chiral GNRs evolve gradually from these two distinct cases from chiral angles of 30° to 0°, with the smallest value of failure stress and failure strain happening around a chiral angle of 20°. As for the width size effect, wider GNRs always have lower failure strains and failure stress regardless of having edge hydrogen passivation or not.
{"title":"Mechanical Properties of Hydrogen Edge–Passivated Chiral Graphene Nanoribbons","authors":"Yanbiao Chu, T. Ragab, P. Gautreau, C. Basaran","doi":"10.1061/(ASCE)NM.2153-5477.0000101","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000101","url":null,"abstract":"AbstractUniaxial tension of chiral graphene nanoribbons (GNR) with and without edge hydrogen passivation are simulated using molecular dynamics (MD) simulations to study their mechanical properties. The results demonstrate that hydrogen saturation generally weakens chiral GNRs, although its influence on armchair GNRs is almost negligible. Mechanical properties of GNRs depend on chiral angles. Zigzag GNRs (chiral angle 0°) are always the strongest, whereas armchair GNRs (chiral angle 30°) are weaker. The mechanical properties of other chiral GNRs evolve gradually from these two distinct cases from chiral angles of 30° to 0°, with the smallest value of failure stress and failure strain happening around a chiral angle of 20°. As for the width size effect, wider GNRs always have lower failure strains and failure stress regardless of having edge hydrogen passivation or not.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":"04015001"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58479357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-01DOI: 10.1061/(ASCE)NM.2153-5477.0000093
Bin Zhao
AbstractTo study the fire protection effect of the nanocoating on the liquefied petroleum gas (LPG) tank under fire, the wavelet finite-element method is applied in analyzing the thermal stress, temperature, and pressures distribution laws of uncoated, coated, and nanocoated LPG tanks. First, the relating research on nanocoating and the wavelet finite-element method is studied, respectively, and the feasibility of this research is analyzed. Second, the theoretical model of fire protection analysis of nanocoating is established, and the property of wavelet analysis, temperature field model, and turbulent flow model are constructed, respectively. Finally, the simulation is carried out, and the distribution laws of thermal stress, temperature, and pressure are obtained. Simulation results show that the nanocoated LPG has better heat insulation character, and it can be used as a passive fireproof system that can cooperate with rain fire extinguishing systems to reduce the explosion hazard of a LPG tank under ...
{"title":"Fire Protection Performance of Nanocoating on a LPG Tank under Fire Based on the Wavelet Finite-Element Method","authors":"Bin Zhao","doi":"10.1061/(ASCE)NM.2153-5477.0000093","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000093","url":null,"abstract":"AbstractTo study the fire protection effect of the nanocoating on the liquefied petroleum gas (LPG) tank under fire, the wavelet finite-element method is applied in analyzing the thermal stress, temperature, and pressures distribution laws of uncoated, coated, and nanocoated LPG tanks. First, the relating research on nanocoating and the wavelet finite-element method is studied, respectively, and the feasibility of this research is analyzed. Second, the theoretical model of fire protection analysis of nanocoating is established, and the property of wavelet analysis, temperature field model, and turbulent flow model are constructed, respectively. Finally, the simulation is carried out, and the distribution laws of thermal stress, temperature, and pressure are obtained. Simulation results show that the nanocoated LPG has better heat insulation character, and it can be used as a passive fireproof system that can cooperate with rain fire extinguishing systems to reduce the explosion hazard of a LPG tank under ...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58478993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-01DOI: 10.1061/(ASCE)NM.2153-5477.0000087
Po-Hua Lee, H. Yin
AbstractA simple, economic, and scalable material manufacturing method of sedimentation has been used to fabricate functionally graded materials for solar roofing panels. This paper investigates the size effect of aluminum powder on the material gradation in the depth direction when only aluminum powder or the mixture of aluminum and high-density polyethylene (HDPE) powder is uniformly dispersed in ethanol and then subjected to sedimentation for a certain period, respectively. A Stokes’ law–based model is developed to simulate the sedimentation process, in which the concentration of aluminum and HDPE particles temporally and spatially changes in the depth direction due to the nonuniform motion of particles. The concentration variation further changes the effective viscosity of the suspension, and thus affects the drag force of particles. The numerical simulation demonstrates the effect of manufacturing parameters for sedimentation and predicts the graded microstructure of deposition in the depth direction...
{"title":"Size Effect on Functionally Graded Material Fabrication by Sedimentation","authors":"Po-Hua Lee, H. Yin","doi":"10.1061/(ASCE)NM.2153-5477.0000087","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000087","url":null,"abstract":"AbstractA simple, economic, and scalable material manufacturing method of sedimentation has been used to fabricate functionally graded materials for solar roofing panels. This paper investigates the size effect of aluminum powder on the material gradation in the depth direction when only aluminum powder or the mixture of aluminum and high-density polyethylene (HDPE) powder is uniformly dispersed in ethanol and then subjected to sedimentation for a certain period, respectively. A Stokes’ law–based model is developed to simulate the sedimentation process, in which the concentration of aluminum and HDPE particles temporally and spatially changes in the depth direction due to the nonuniform motion of particles. The concentration variation further changes the effective viscosity of the suspension, and thus affects the drag force of particles. The numerical simulation demonstrates the effect of manufacturing parameters for sedimentation and predicts the graded microstructure of deposition in the depth direction...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000087","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58478233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-01DOI: 10.1061/(ASCE)NM.2153-5477.0000091
H. Salahshoor, M. Tootkaboni, N. Rahbar
AbstractRecently, hydrogels have been employed in a variety of engineering applications as promising materials, since their porous structure and hydrophilicity enables them to absorb a large amount of water. Atomistic simulations lead to a better understanding of their properties at nanoscale, especially mechanical properties. In this study, hydrogel is studied using a molecular dynamics (MD) framework, considering condensed-phased optimized molecular potential (COMPASS) as the force field. Polyethylene glycol diglycidyl ether (PEDGE) and poly-oxy-alkylene-amines (Jeffamine) are the epoxy and curing agent used for hydrogels, and a novel cross-linking method is applied. Radial Distribution Functions (RDFs) show that the cross-links are the hydrophilic part of hydrogel. RDFs and mechanical properties are reported for different water amounts. The results show that an increase in water content leads to a decrease in elastic modulus of the hydrogel.
{"title":"Nanoscale Structure and Mechanical Properties of Cross-Linked Hydrogels","authors":"H. Salahshoor, M. Tootkaboni, N. Rahbar","doi":"10.1061/(ASCE)NM.2153-5477.0000091","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000091","url":null,"abstract":"AbstractRecently, hydrogels have been employed in a variety of engineering applications as promising materials, since their porous structure and hydrophilicity enables them to absorb a large amount of water. Atomistic simulations lead to a better understanding of their properties at nanoscale, especially mechanical properties. In this study, hydrogel is studied using a molecular dynamics (MD) framework, considering condensed-phased optimized molecular potential (COMPASS) as the force field. Polyethylene glycol diglycidyl ether (PEDGE) and poly-oxy-alkylene-amines (Jeffamine) are the epoxy and curing agent used for hydrogels, and a novel cross-linking method is applied. Radial Distribution Functions (RDFs) show that the cross-links are the hydrophilic part of hydrogel. RDFs and mechanical properties are reported for different water amounts. The results show that an increase in water content leads to a decrease in elastic modulus of the hydrogel.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58478914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-01DOI: 10.1061/(ASCE)NM.2153-5477.0000092
Matthew G. Pike, Caglar Oskay
AbstractThis manuscript presents the formulation and implementation of an extended finite-element method (XFEM) for random short fiber-reinforced composite materials. A new enrichment function is proposed to incorporate the effect of random fiber inclusions within the XFEM framework to eliminate the need of using finite-element meshes compliant with fiber inclusions. The motion of the fiber inclusions are modeled by constraining the deformation field along the domain of the fiber inclusions. Coupling the XFEM along with the new enrichment function and constraint equations formulate the elastic response of short fiber-reinforced composites. Numerical integration procedures are provided for accurate evaluation of the system response for fiber tips that lie on arbitrary positions within the problem domain. The performance of the proposed model is verified against the direct finite-element method.
{"title":"Modeling Random Short Nanofiber- and Microfiber-Reinforced Composites Using the Extended Finite-Element Method","authors":"Matthew G. Pike, Caglar Oskay","doi":"10.1061/(ASCE)NM.2153-5477.0000092","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000092","url":null,"abstract":"AbstractThis manuscript presents the formulation and implementation of an extended finite-element method (XFEM) for random short fiber-reinforced composite materials. A new enrichment function is proposed to incorporate the effect of random fiber inclusions within the XFEM framework to eliminate the need of using finite-element meshes compliant with fiber inclusions. The motion of the fiber inclusions are modeled by constraining the deformation field along the domain of the fiber inclusions. Coupling the XFEM along with the new enrichment function and constraint equations formulate the elastic response of short fiber-reinforced composites. Numerical integration procedures are provided for accurate evaluation of the system response for fiber tips that lie on arbitrary positions within the problem domain. The performance of the proposed model is verified against the direct finite-element method.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58478944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：