Srdan Simunovic
Oak Ridge National Laboratory
Composite numberTest methodFinite element methodLattice (order)Strain rateComposite materialEpoxyCrashMaterials scienceConstitutive equationCrashworthinessStiffnessMathematicsNumerical analysisFiberAutomotive industryBoundary element methodStructural engineeringSurface finishPlasticityScaling
46Publications
14H-index
913Citations
Publications 44
Newest
#1M.H.A. Piro (ORNL: Oak Ridge National Laboratory)H-Index: 8
#2Srdan Simunovic (ORNL: Oak Ridge National Laboratory)H-Index: 14
Several global optimization methods are reviewed that attempt to ensure that the integral Gibbs energy of a closed isothermal isobaric system is a global minimum to satisfy the necessary and sufficient conditions for thermodynamic equilibrium. In particular, the integral Gibbs energy function of a multicomponent system containing non-ideal phases may be highly non-linear and non-convex, which makes finding a global minimum a challenge. Consequently, a poor numerical approach may lead one to the ...
9 CitationsSource
#2Pallab BaraiH-Index: 17
Last. Srdan SimunovicH-Index: 14
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We study the scaling of three-dimensional crack roughness using large-scale beam lattice systems. Our results for prenotched samples indicate that the crack surface is statistically isotropic, with the implication that experimental findings of anisotropy of fracture surface roughness in directions parallel and perpendicular to crack propagation is not due to the scalar or vectorial elasticity of the model. In contrast to scalar fuse lattices, beam lattice systems do not exhibit anomalous scaling...
11 CitationsSource
#1Phani K. V. V. Nukala (ORNL: Oak Ridge National Laboratory)H-Index: 17
#2Stefano Zapperi (Institute for Scientific Interchange)H-Index: 52
Last. Srdan Simunovic (ORNL: Oak Ridge National Laboratory)H-Index: 14
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We study the scaling of two-dimensional crack roughness using large scale beam lattice systems. Our results indicate that the crack roughness obtained using beam lattice systems does not exhibit anomalous scaling in sharp contrast to the simulation results obtained using scalar fuse lattices. The local and global roughness exponents loc and , respectively are equal to each other, and the two-dimensional crack roughness exponent is estimated to be loc= = 0.64 0.02. Removal of overhangs jumps in t...
14 CitationsSource
#1Phani K. V. V. Nukala (ORNL: Oak Ridge National Laboratory)H-Index: 17
#2Stefano Zapperi (Institute for Scientific Interchange)H-Index: 52
Last. Srdan Simunovic (ORNL: Oak Ridge National Laboratory)H-Index: 14
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We analyze the effect of disorder and notches on crack roughness in two dimensions. Our simulation results based on large system sizes and extensive statistical sampling indicate that the crack surface exhibits a universal local roughness of ζ loc =0.71 and is independent of the initial notch size and disorder in breaking thresholds. The global roughness exponent scales as ζ=0.87 and is also independent of material disorder. Furthermore, we note that the statistical distribution of crack profile...
3 CitationsSource
#1George C. Jacob (UT: University of Tennessee)H-Index: 10
#2J. Michael Starbuck (ORNL: Oak Ridge National Laboratory)H-Index: 12
Last. Raymond G. Boeman (ORNL: Oak Ridge National Laboratory)H-Index: 9
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The ACC (Automotive Composite Consortium) is interested in investigating the use of random chopped fiber reinforced composites as crash energy absorbers primarily because of the low costs involved in their manufacture thus making them cost effective for automotive applications. Although many scientists have investigated the energy absorption characteristics in various continuous fiber reinforced composite materials and their dependence on strain rate, there is very little literature available on...
22 CitationsSource
#1George C. Jacob (UT: University of Tennessee)H-Index: 10
#2James Michael Starbuck (ORNL: Oak Ridge National Laboratory)H-Index: 2
Last. Raymond G. Boeman (ORNL: Oak Ridge National Laboratory)H-Index: 9
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While many scientists have investigated the fracture toughness properties in various continuous fiber-reinforced composite materials and their dependence on strain rate, there is absolutely no literature available on the fracture toughness properties of random-chopped fiber-reinforced composite materials and their strain rate dependence, which can find extensive use in a wide range of load-bearing engineering and industrial process applications primarily due to the low costs involved in their ma...
26 CitationsSource
#2Srdan SimunovicH-Index: 14
Last. Andrei A. GusevH-Index: 1
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#1Phani K. V. V. Nukala (ORNL: Oak Ridge National Laboratory)H-Index: 17
#2Srdan Simunovic (ORNL: Oak Ridge National Laboratory)H-Index: 14
Abstract This study investigates the fracture properties of nacre using a discrete lattice model based on continuous damage random threshold fuse network. The discrete lattice topology of the model is based on nacre's unique brick and mortar microarchitecture. The mechanical behavior of each of the bonds in the discrete lattice model is governed by the characteristic modular damage evolution of the organic matrix and the mineral bridges between the aragonite platelets. The numerical results obta...
37 CitationsSource
#1George C. Jacob (UT: University of Tennessee)H-Index: 10
#2J. Michael Starbuck (ORNL: Oak Ridge National Laboratory)H-Index: 12
Last. Srdan Simunovic (ORNL: Oak Ridge National Laboratory)H-Index: 14
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Composite materials have the potential to reduce the overall cost and weight of automotive structures with the added benefit of being able to dissipate large amounts of impact energy by progressive crushing. To identify and quantify the energy-absorbing mechanisms in candidate automotive composite materials, modified test methodologies were developed for conducting progressive crush tests on flat-plate composite specimens. The test method development and experimental setup focused on isolating t...
28 CitationsSource
#1George C. Jacob (UT: University of Tennessee)H-Index: 10
#2J. Michael Starbuck (ORNL: Oak Ridge National Laboratory)H-Index: 12
Last. Raymond G. Boeman (ORNL: Oak Ridge National Laboratory)H-Index: 9
view all 5 authors...
This article is a detailed review of the strain rate dependence of fracture toughness properties in polymer composite materials. An attempt is made to draw together all the strain rate studies done in the past and to elucidate the reasons given by the authors of the reviewed papers for the trends resulting from their studies to better understand the strain rate effects on the fracture toughness of fiber reinforced polymer composite materials. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 8...
51 CitationsSource