Yield surfaces of various periodic metal honeycombs at intermediate relative density

Wang, A.-J.; McDowell, David L.

doi:10.1016/j.ijplas.2003.12.002

Cited by 135 publications

(65 citation statements)

References 38 publications

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“…Similar conclusions are made for the response of the square honeycomb cores [Xue et al 2005 [Gibson et al 1989;Papka and Kyriakides 1999;Okumura et al 2002]. Wang and McDowell [2005] studied the initial yield surface of several periodic metal honeycomb cores with high relative density under in-plane biaxial and triaxial stress states. For all the cases studied, the relative density of the core is sufficiently high that the initial nonlinearity of the response is mainly due to plastic yielding of the core material.…”

Section: 1supporting

confidence: 54%

Mechanical behavior and constitutive modeling of metal cores

Vaziri

Xue

2007

JOMMS

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Studying the mechanical behavior of metal cores provides insight into the overall performance of structures comprising metal sandwich plates, and can help immensely in designing metal sandwich plates for specific engineering applications. In this study, the response of folded (corrugated) plate and pyramidal truss cores are explored under both quasistatic and dynamic loadings. In particular, two important characteristics of metal cores, the nonuniform hardening/softening evolution due to stressing in different directions and the rate-dependence, are discussed for different core topologies, including the square honeycomb core. In addition, the role of core behavior on the overall performance of sandwich plates is studied by employing a constitutive model for the elastic-plastic behavior of plastically compressible orthotropic materials [Xue et al. 2005]. The constitutive model is capable of capturing both the anisotropy of the core, associated with stressing in different directions, and its rate-dependence. The approach, based on employing the core constitutive model, not only significantly reduces the computation time, but also permits exploration of the role of each fundamental rate-dependent response of the metal core on the overall response of the metal sandwich plates.

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Section: 1supporting

confidence: 54%

Mechanical behavior and constitutive modeling of metal cores

Vaziri

Xue

2007

JOMMS

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“…The crushing of aluminium honeycomb core has been extensively studied by Wierzbicki et Al [13] [14] and, more recently, by Mohr et Al [15]- [17]. Constitutive equivalent models have been developed [18], [19] and have been applied successfully to experiments on large structures subjected to blast A c c e p t e d m a n u s c r i p t loads. However, complex multiaxial experiments on honeycomb are required to identify the crushing laws and, as pointed out by Vaziri [20], the models are not suitable for simulating the phenomenon locally.…”

Section: -Introductionmentioning

confidence: 99%

Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins

Castanié¹,

Bouvet²,

Aminanda

et al. 2008

International Journal of Impact Engineering

100

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Abstract.In the aircraft industry, manufacturers have to decide quickly whether an impacted sandwich needs repairing or not. Certain computation tools exist at present but they are very time consuming and they also fail to perfectly model the physical phenomena involved in an impact. In a previous publication, the authors demonstrated the possibility of representing the NomexTM honeycomb core by a grid of nonlinear springs and have pointed out both the structural behaviour of the honeycomb and the influence of core-skin boundary conditions. This discrete approach accurately predicts the static indentation on honeycomb core alone and the indentation on sandwich structure with metal skins supported on rigid flat support. In this study, the domain of validity of this approach is investigated. It is found that the approach is not valid for sharp projectiles on thin skins. In any case, the spring elements used to model the honeycomb cannot take into account the transverse shear that occurs in the core during the bending of a sandwich. To overcome this strong limitation, a multi-level approach is proposed in the present article. In this approach, the sandwich structure is modelled by Mindlin plate elements and the computed static contact law is implemented in a non linear spring located between the impactor and the structure. Thus, it is possible to predict the dynamic structural A c c e p t e d m a n u s c r i p t response in the case of low-velocity/low-energy impact on metal-skinned sandwich structures.A good correlation with dynamic experimental tests is achieved. Keywords.Sandwich structures, low velocity/low energy impact, finite element nonlinear analysis, indentation. 1-IntroductionSandwich structures exhibit static properties such as high stiffness-to-weight ratio and high buckling loads which are of great importance in the aeronautics field. Nevertheless, the current applications on commercial airplanes remain mainly limited to secondary structures like control surface or floor panels. In the field of helicopters where stress levels are lower, full sandwich structures are already in flight. In fact, one of the main limitations is linked to a lack of knowledge on the effects induced by impact damages [1]. However, in service, such structures are exposed and are often impacted during taxiing manoeuvres or take-off. They can also be damaged by tool drops during maintenance operations [2] and [3]. In such circumstances, the aircraft manufacturer has to inform the users very quickly of whether the impacted structure needs a repair or not. The study presented in this article is a step toward the final objective, which is to provide the aerospace industry with an inverse method. In this method, a 3D picture of the damage is first made by the airline company. Then, based on the shape of the impact, the impactor's shape is found and both the impact damage and the residual strength would be computed. All the approaches presented have a common feature which is to consider the honeycomb as a homogeneous material. Recent...

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“…Here, we will evaluate the model performance for quasi-static loading. The experimental results of Mohr and Doyoyo [2004b], Wang and McDowell [2005] and Hong et al [2006] have shown that the initial outof-plane yield surface of honeycombs is of elliptical shape (Figure 1). This important feature has been incorporated into the constitutive model of , thereby improving the poor performance of frequently used heuristic constitutive .…”

Section: Introductionmentioning

confidence: 97%

Quasi-static punch indentation of a honeycomb sandwich plate: experiments and modelling

Mohr¹,

Xue²,

Vaziri³

2006

JOMMS

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Punching experiments on wide honeycomb sandwich beams were performed to evaluate the predictive capabilities of a newly developed constitutive model in structural applications. The employed constitutive model for plastically compressible orthotropic materials accounts for both non-uniform hardening and softening associated with stressing in different directions. This feature is vital when assessing the structural performance of metal sandwich plates with low density cellular cores. Pure shear and uniaxial compression tests have been carried out to identify the input stress-strain data for the constitutive model. The sandwich beam has been modeled with shell/beam elements for the face sheets and only one continuum element through-the-thickness for the honeycomb core material. Comparison of the numerical results with experimental observations validates the capability of the proposed approach based on continuum modeling of the core in capturing the main features of sandwich beam response under punch loading.

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Yield surfaces of various periodic metal honeycombs at intermediate relative density

Cited by 135 publications

References 38 publications

Mechanical behavior and constitutive modeling of metal cores

Mechanical behavior and constitutive modeling of metal cores

Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins

Quasi-static punch indentation of a honeycomb sandwich plate: experiments and modelling

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