Numerical investigation of energy absorption mechanisms in unidirectional composites subjected to dynamic loading events

Segala, David B.; Cavallaro, Paul V.

doi:10.1016/j.commatsci.2013.08.039

Cited by 24 publications

(14 citation statements)

References 16 publications

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“…The HIC Parameter (Head injury criterion) determines the probability of injury to the head under the influence of acceleration expressed with function a(t). (1) where t 1 and t 2 are the initial and final times (in seconds) of the interval during which HIC attains a maximum value, and acceleration a is measured in standard gravity acceleration. Note also the maximum time duration of HIC, t 2 -t 1 , is limited to a specific value between 3 and 36 ms, usually 15 ms.…”

Section: Computational Modelmentioning

confidence: 99%

See 1 more Smart Citation

Finite Element Analysis Of Large Deformation Of Articular Cartilage In Upper Ankle Joint Of Occupant In Military Vehicles During Explosion

Klekiel¹,

Będziński²

2015

Archives of Metallurgy and Materials

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The paper presents the analysis of the load of lower limbs of occupants in the armoured military vehicle, which has been destroyed by detonation of the Improvised Explosive Device (IED) charge under the vehicle. A simplified model of the human lower limb focused on upper ankle joint was developed in order to determine the reaction forces in joints and load in particular segments during the blast load. The model of upper ankle joint, include a tibia and an ankle bone with corresponding articular cartilage, has been developed. An analysis of the stress distribution under the influence of forces applied at different angles to the biomechanical axis of a limb has been performed. We analyzed the case of the lower limb of a sitting man leaning his feet on the floor. It has been shown that during a foot pronation induced by a knee outward deviation, the axial load on the foot causes significantly greater tension in the tibia. At the same time it has been shown that within the medial malleolus, tensile stresses occur on the surface of the bone which may lead to fracture of the medial malleolus. It is a common case of injuries caused by loads on foot of passengers in armored vehicles during a mine or IED load under the vehicle. It was shown that the outward deviation of the knee increases the risk of the foot injury within the ankle joint.Keywords: Large deformation, Finite element modeling, lower limb injury, upper ankle joint, military vehicle, explosion W artykule przedstawiono analizę MES obciążenia kończyn dolnych osób w opancerzonym pojeździe wojskowym, który został zniszczony przez zaimprowizowaną detonację ładunku wybuchowego (IED) pod pojazdem. W uproszczonym modelu dolnej kończyny ludzkiej skoncentrowano się na górnej części stawu skokowego. Model opracowany został w celu określenia siły reakcji w stawach i obciążenia w poszczególnych segmentach podczas obciążenia wybuchowego. Model górnego stawu skokowego, obejmuje kość piszczelową oraz kości stawu skokowego z odpowiadającymi chrząstkami stawowymi. Przeprowadzono analizę rozkładu naprężeń pod wpływem sił wywieranych pod różnymi kątami w stosunku do osi biomechanicznej kończyny. Przeanalizowano przypadek kończyny dolnej siedzącego mężczyzny z nogą opartą na podłodze. Wykazano, że podczas skręcenia stopy indukowanego przez odwiedzenie kolana na zewnątrz, siła osiowa na stopie powoduje znacznie większe naprężenie rozciągające w kości piszczelowej. Jednocześnie wykazano, że w kostce przyśrodkowej, naprężenia rozciągające występują na powierzchni kości, co może prowadzić do wystąpienia złamania kostki przyśrodkowej. Jest to częsty przypadek obrażeń spowodowanych obciążeniami stóp pasażerów pojazdów pancernych podczas eksplozji miny lub wybuchu ładunku ( IED) pod pojazdem. Wykazano, że odchylenie kolana zwiększa ryzyko obrażeń stopy w stawie skokowym.

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Section: Computational Modelmentioning

confidence: 99%

“…25% of all injuries are related to the ankle joint and a foot. In modern solutions of military vehicles the complex composite structures are used to absorb energy [1]. Such materials have good characteristic to absorb energy enforced by dynamic impact of the pressure from the explosion and the shock wave.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis Of Large Deformation Of Articular Cartilage In Upper Ankle Joint Of Occupant In Military Vehicles During Explosion

Klekiel¹,

Będziński²

2015

Archives of Metallurgy and Materials

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“…The numerical modeling of composite materials under impact can be performed at a constituent level (i.e., explicit modeling of fibre and matrix elements, e.g., [1]), a meso-mechanical level (i.e., consolidated plies or fibre bundles, e.g., [2] Nguyen et al [9] evaluated and refined the modeling approach and material model parameter set developed in Ref. [8] for the simulation of impact events from 400 m/s to 6,600 m/s.…”

Section: State-of-the-artmentioning

confidence: 99%

Untitled

2015

JCC

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Abstract:In the security sector, the partly insufficient safety of people and equipment due to failure of industrial components are ongoing problems that cause great concern. Since computers and software have spread into all fields of industry, extensive efforts are currently made in order to improve the safety by applying certain numerical solutions. This work presents a set of numerical simulations of ballistic tests which analyze the effects of composite armor plates. The goal is to improve fiber-reinforced plastics in order to be able to cope with current challenges. Of course, the maximization of security is the primary goal, but keeping down the costs is becoming increasingly important. This is why numerical simulations are more frequently applied than experimental tests which are thus being replaced gradually.

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“…2 STATE-OF-THE-ART As shown in [1], the numerical modeling of composite materials under impact can be performed at a constituent level (i.e., explicit modeling of fibre and matrix elements, e.g., [2]), a mesomechanical level (i.e., consolidated plies or fibre bundles, e.g., [3]), or macromechanically in which the composite laminate is represented as a continuum.…”

Section: Introductionmentioning

confidence: 99%

Investigation of simulation methodologies for ultra-high–molecular-weight polyethylene

Ramezani¹,

Rothe²

2018

Int. J. SAFE

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This work deals with numerical simulations of impact problems on fiber-based composite armor using the commercial finite-element-code ANSYS AUTODYN. Having presented some basic knowledge on the theory of numerical simulation in AUTODYN, two recently published approaches for modeling impact on the selected composite (Dyneema® HB26) are explained. Although both of them make use of a nonlinear-orthotropic material model implemented in the AUTODYN-code, they differ in the way how the highly inhomogeneous microstructure of HB26 is represented geometrically. Lässig chooses a fully homogeneous description, whereas Nguyen discretizes the composite into sublaminates, which are kinematically joined at the surfaces and breakable when a certain contact-stress is reached. In order to validate the two approaches, the response of HB26-samples impacted by handgun-projectiles was determined experimentally and compared to the corresponding numerical results. Unfortunately, a poor agreement between experimental and numerical results was found, which gave rise to the development of an alternative modeling approach. In doing so, the composite was subdivided into alternating layers of two different types. While the first type of layers was modeled with open-literature properties of UHMWPE-fibers, polymer-matrix-behavior was assigned to the second type. Having adjusted some of the parameters, good agreement between experiment and simulation was found with respect to residual velocity and depth of penetration for the considered impact situations.

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Numerical investigation of energy absorption mechanisms in unidirectional composites subjected to dynamic loading events

Cited by 24 publications

References 16 publications

Finite Element Analysis Of Large Deformation Of Articular Cartilage In Upper Ankle Joint Of Occupant In Military Vehicles During Explosion

Finite Element Analysis Of Large Deformation Of Articular Cartilage In Upper Ankle Joint Of Occupant In Military Vehicles During Explosion

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Investigation of simulation methodologies for ultra-high–molecular-weight polyethylene

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