Vu Ngoc Khiêm
RWTH Aachen University
HysteresisBasis (linear algebra)Finite element methodSoft tissueDeformation (engineering)Hyperelastic materialPhase transitionComposite materialNanotechnologyChain (algebraic topology)Natural rubberIsotropyExtracellular matrixMaterials scienceConstitutive equationCrystallizationFibrilMullins effectSofteningMathematicsMicromechanicsElastomerCarbon blackDielectric elastomersFiberExperimental dataMechanicsFunction (mathematics)Electric fieldStrain (chemistry)Structural engineeringClassical mechanicsAnisotropyStress (mechanics)Thermodynamics
22Publications
9H-index
187Citations
Publications 23
Newest
#1Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
#2J.-B. Le Cam (University of Rennes)H-Index: 2
Last. Mikhail Itskov (RWTH Aachen University)H-Index: 30
view all 4 authors...
Abstract null null To understand thoroughly the strain-induced crystallization in natural rubbers, conventional mechanical measurements are inadequate because they only provide a macroscopic relation between stress and strain. In this second part, a physically-based constitutive model for filled natural rubbers is coupled with the infrared thermography based quantitative surface calorimetry (Part I) to shed new light on multiaxiality of strain-induced crystallization. In contrast to previous wor...
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#1Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
#2J.-B. Le Cam (University of Rennes)H-Index: 2
Last. Mikhail Itskov (RWTH Aachen University)H-Index: 30
view all 4 authors...
Abstract null null The present paper provides the first full thermo-mechanical characterization of a crystallizing filled natural rubber under uniaxial and biaxial loadings. During the mechanical tests, the temperature was measured by using infrared thermography and processed by means of the heat diffusion equation for determining the corresponding heat power density. The intrinsic dissipation due to viscosity and stress softening are evaluated under cyclic loading by the energy balance. Energy ...
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#1Thang X. DuongH-Index: 8
#2Vu Ngoc KhiêmH-Index: 9
Last. Roger A. SauerH-Index: 26
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In this work we present a generalized Kirchhoff-Love shell theory that can capture anisotropy not only in stretching and out-of-plane bending, but also in in-plane bending. This setup is particularly suitable for heterogeneous and fibrous materials such as textiles, biomaterials, composites and pantographic structures. The presented theory is a direct extension of existing Kirchhoff-Love shell theory to incorporate the in-plane bending resistance of fibers. It also extends existing high gradient...
#1Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
#2Thanh-Tam Mai (Kyoto Institute of Technology)H-Index: 7
Last. Mikhail Itskov (RWTH Aachen University)H-Index: 30
view all 5 authors...
The incorporation of a stiff and brittle phase into a soft and flexible polymer network makes double network hydrogels remarkably tougher than the conventional one. It also induces a stress softening in cyclic loading, which is seemingly identical to that of filled rubbers. Therefore, material models proposed for double network hydrogel are mostly based on continuum damage theories of filled elastomers. However, recent experimental studies clearly distinguish double network hydrogels from filled...
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#1Vu Ngoc KhiêmH-Index: 9
#2J.-B. Le CamH-Index: 2
Last. Mikhail ItskovH-Index: 30
view all 4 authors...
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#1Mikhail Itskov (RWTH Aachen University)H-Index: 30
#2Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
Last. Sugeng Waluyo (RWTH Aachen University)H-Index: 1
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The mechanical response of dielectric elastomers can be influenced or even controlled by an imposed electric field. It can, for example, cause mechanical stress or strain without any applied load; ...
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#1Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
#2Mikhail Itskov (RWTH Aachen University)H-Index: 30
Abstract In this contribution, we extend the analytical network-averaging concept (Khiem and Itskov, 2016) to phase transition during strain-induced crystallization of natural rubber. To this end, a physically-based constitutive model describing the nonisothermal strain-induced crystallization is proposed. Accordingly, the spatial arrangement of polymer subnetworks is driven by crystallization nucleation and consequently alters the mesoscopic deformation measures. The crystallization growth is e...
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#1Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
#2Mikhail Itskov (RWTH Aachen University)H-Index: 30
• Excellent agreement with all measurable experimental data: the stress-strain relation, the light emission intensity, the initial number of dioxetane cross-links, the number of broken dioxetane cross-links and the activation energy of the mechanophore for both unfilled and filled elastomers under multiple cyclic loadings.
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#1Vu Ngoc KhiêmH-Index: 9
#2Mikhail ItskovH-Index: 30
Source
#1Vu Ngoc Khiêm (RWTH Aachen University)H-Index: 9
#2Mikhail Itskov (RWTH Aachen University)H-Index: 30
Abstract In this paper, a micromechanically based constitutive model capturing anisotropic stress softening in reinforced elastomers under quasi-static loading is presented. A novel spatial distribution function of polymer chains taking into account its deformation induced anisotropic alignment is proposed. By this means, the anisotropic network averaging over the unit sphere can be evaluated analytically. The anisotropic alignment of polymer chains introduces non-affine deformation in the model...
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