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عنوان فارسی مقاله:
تجزیه و تحلیل حالات شکست انفجار نهایی در ورقه های فلزی فیبر
عنوان انگلیسی مقاله:
The analysis of the ultimate blast failure modes in fibre metal laminates
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
A fibre-metal laminate (FML) is a type of sandwich structure consisting of alternating layers of metal and fibre-reinforced composite. The particular interest in using these hybrid materials is linked to their attractive properties, such as high strength/weight ratio, cost-effectiveness, an ability to tailor material properties, and good fatigue, impact and corrosion resistance. These attributes make FMLs suitable for a range aerospace applications [1]. As impact damage is a relatively common failure type in aircraft structures, the response of FMLs to such form of dynamic loading has been extensively studied, both numerically and experimentally [2]. Numerous experimental studies have been carried out to investigate the influence of the constituents on the impact properties of FMLs. Vlot [3] showed that the puncture energies glass laminate aluminium reinforced epoxy (GLARE), could be higher than those of aluminium sheets of the same thickness. Abdullah and Cantwell [4] conducted impact tests on FMLs made with two different aluminium alloys, and showed that the perforation resistance was higher for FMLs based on a stronger alloy. Yaghoubi and Liaw [5] noted that interfacial debonding was influenced by the composite stacking sequence of the FML. For applications in the design of the aerospace structures, FMLs should also possess an adequate blast resistance to meet the necessary safety requirements. A number of numerical and experimental studies have conducted to investigate various aspects of the blast response of FMLs. In particular, Langdon et al. [6,7] undertook an experimental study to investigate the effects of localized blast loading on both thin and thick FML panels. The authors presented a systematic account of the large variety of failure scenarios observed following the tests. In particular, the tests showed that in thick panels with a high proportion of composite material, one of the principal failure mechanisms was extensive debonding of the back face aluminium layer, with the debonded area increasing with increasing impulse. Numerical modelling of the response of GLARE panels to the blast loading has been undertaken by Mohamed et al. [8] and Kotzakolios et al. [9], who used different finite element codes in their investigations. Predictions of the mid-point deflection and global deformation, as well as damage in the panels, werecompared with those obtained experimentally, showing a reasonable level of agreement between the two. These studies, however, were concerned only with the assessment of the deformation and the damage modes in the FMLs for cases where perforation of the panels did not occur. A critical review of published work on numerical and analytical modelling of the impact response of FMLs was carried out by Moriniere et al. [10]. They stated that conducting impact tests on FMLs is very time-consuming and the experimental results are typically scattered, meaning that a large number of tests are required to obtain statistically significant data. Therefore, in order to carry out systematic studies on the impact response of FMLs, reliable modelling techniques need to be developed and applied to complement the associated experimental studies. One of the commonly employed approaches for the numerical analysis of FML failure is through finite element (FE) modelling using commercially-available software packages. In these types of models, each of the FML constituent materials is assigned an appropriate material behaviour [8,9,11]. However, modelling the constitutive response of the composite is not fully established, due to the complexity of damage initiation/evolution, strain-rate dependence and failure mechanisms in these materials. Because of this, simplifying assumptions are often made when describing the material behaviour of the composite materials in FMLs, such as treating the thin woven composite as an isotropic layer within the plane [12]. Many composite failure models are based on a planestress state material response, in accordance with the assumptions of Classical Laminate Theory. This can be a limitation in modelling through-thickness impact damage [8], when high compressive stresses occur in the material. Gama and Gillespie [13] proposed a constitutive model that accounts for a strain-rate dependence and damage evolution in both unidirectional and woven composites under a 3D stress state. In terms of modelling the rate-dependent material response, the model has certain limitations, such as the rate-dependency of the material strengths being prescribed via a single rate scaling coefficient. The definition of the blast loading event is yet another issue when modelling the blast response of FMLs. In many finite element software codes, models for the explicit definition of the explosive are often available. In some studies on blast failure of FMLs [9,14], those models were directly applied to define the blast loading. Though this provides a reasonable representation of blast loading, the main drawback of these types of model are the high associated computational costs, since the explicit definition of the explosive also requires definition of the fluid-structure interaction. Specifically, Soutis et al. [14] simulated the blast failure of a GLARE panel using two finite element models. In the first model, blast charge was modelled explicitly, while in the second model it was prescribed via a simpler, but more computationally effective algorithm, where blast load was defined by a pressure function applied on the surface of the target. The study showed that the latter approach can reduce the CPU time by a factor of 10. Modelling blast loading via a pressure function applied on the surface of the target has also been adopted in some other studies investigating blast failure in FMLs [8,11,15], where reasonable agreement between the observed and simulated responses of the FML panels were achieved. In the current paper, blast damage and associated failure are simulated in FML panels based on various lay-ups subjected to a variety of loading scenarios. A relatively simple continuum mechanics based model is proposed to define the constitutive behaviour of the composite. The formulation is applicable for composites based on a plain weave, an architecture that provides a superior impact or shock resistance in structures than unidirectional reinforcements [16]. Comparisons with experiments [6,7] are carried out to assess the predictive capability of the models. In contrast to previous modelling efforts on this subject [11,15,17], both perforation and non-perforation modes of failure are captured, yielding an insight into blast failure in FLMs. Furthermore, the current composite model incorporates the most common aspects of the dynamic failure process in fibre reinforced composites, namely, a 3D constitutive behaviour, damage evolution and rate-dependent characteristics.
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کلمات کلیدی:
Sparrho | The analysis of the ultimate blast failure modes in fibre m https://www.sparrho.com/item/...analysis-of-the-ultimate-blast-failure-modes.../9cfd57... Oct 15, 2016 - Publication date: 27 October 2016 Source:Composites Science and Technology, Volume 135 Author(s): E. Sitnikova, Z.W. Guan, W.J. Cantwell ... Blast/explosion Resistant Analysis of Composite Steel Girder Bridge ... https://books.google.com/books?isbn=1109314752 Fang Zhou - 2009 The flexural shear failure mode, on the other hand, is abrupt and brittle in ... this is a premature failure mode where the element is unable to develop its ultimate ... Tree Biotechnology - Page 92 - Google Books Result https://books.google.com/books?isbn=1138000450 Kishan Gopal Ramawat, Jean-Michel Mérillon, M. R. Ahuja - 2014 - Medical The structural response of ship-panels subjected to air blast was investigated by ... were conducted and results were compared with numerical finite element analysis. ... bulkhead subjected to blast loading using energy method, and the ultimate ... Ramaj eyathilagam and Vendan (2004) investigated the failure modes and ... Analysis of the Dynamic Response in Blast-Loaded CFRP - Hindawi https://www.hindawi.com/journals/amse/2013/521404/ by Z Wang - 2013 - Cited by 1 - Related articles Jun 4, 2013 - Analysis of the Dynamic Response in Blast-Loaded ... solution for the deformation and ultimate strength calculation of hybrid metal-CFRP beams ... Moreover, different failure modes are taken into account in the FE analyses ... Design of Blast Resistant Buildings in Petrochemical Facilities: ... https://books.google.com/books?isbn=0784402655 Task Committee on Blast Resistant Design - 1997 - Technology & Engineering 5.4.6 Anchor Bolts Blast loaded structures produce high reaction loads at column supports. ... between bolts results in a lower anchorage capacity and a brittle failure mode. ... These should only be used where ultimate loads are less than the rated ... A dynamic analysis is warranted only for special situations, such as where ...
