Emprego De Química Computacional Na Verificação E Validação Da Pressão De Detonação De Explosivo Plástico-PBX

Mendonça, Fausto Batista; Gonçalves, Rene Francisco Boschi; Urgessa, Girum; Iha, Koshun; Domingues, Marcela G.; Rocco, José Atílio Fritz Fidel

doi:10.21577/0100-4042.20170169

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…U ∆ is the energy loss in an increase of integration time, determined in Eqn (14). The value of U is calculated according to Eqn (15) and represents the internal energy of the shear and deviatoric stresses 24,25 .…”

Section: σ σ = σmentioning

confidence: 99%

“…This current paper is a continuation of Mendonça [13][14][15][16][17][18] , et al, developing a series of FEM computer simulations of the airblast effect originating from the detonation of Plastic Bonded Explosives (PBx) on RC slabs and comparing the results with the tests presented by Mendonça [13][14][15][16][17][18] , et al One of the main contributions of the paper is to validate the Abaqus/Explicit ® program 19 in simulations of airblast effects on RC using jH2 25 and HjC 26 constitutive models, previously used in the literature only for simulations of metallic projectiles on RC slabs 24,28,29 . Another unique aspect of this paper is the validation of the FEM models with full-scale explosive tests.…”

Section: Introductionmentioning

confidence: 96%

“…Casagrande 12 used lS-Dyna® to determine the impulsive loads from explosions. Mendonça [13][14][15][16][17][18] , et al presented the result of a set of full-scale tests of explosions on RC slabs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Finite Element Analysis of Experimentally Tested Concrete Slabs Subjected to Airblast

Augusto¹,

Mendonça²,

Urgessa

et al. 2021

Def. Sc. J.

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Since the last century, concrete has been used to protect structures against intentional or accidental detonation of explosives. Recently, as concerns about terrorist activities and accidents in plants using explosives increase worldwide, the study of the behaviour of this type of material and any civil or military structure under the influence of explosions has increased. Among the lethal effects of explosive devices, which cause greater loads in structural elements is the airblast effect. For this reason, this paper presents a series of airblast finite element (FEM) simulations developed in Abaqus/Explicit®. To validate the computational method, such simulations are geometrically and structurally kept similar to full-scale tests conducted in a blast test area of the Science and Technology Aerospace Department (Brazilian Air Force). Both simulations and tests consisted of seven reinforced concrete slabs with compressive strengths of about 40 to 60 MPa, variable steel reinforcement areas, slab dimensions measuring 1×1 m, and subjected to 2.7 kg of non-confined plastic bonded explosive. The results demonstrated that FEM simulations can predict the rupture of the tested slabs and how the effect occurs, showing a valid method to investigating the response of RC slabs when compared to expensive field tests. Differences in displacements were observed between the results of FEM simulations and blast field tests, mainly caused by the sensitivity of the case studied, limits of computational capacity, and intrinsic variations in the materials and sensors used in the field tests. However, these differences showed an order of magnitude compatible with the safety coefficients used with RC, demonstrating that the method can be used for the design of RC slabs under the effect of airblast.

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Section: σ σ = σmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Finite Element Analysis of Experimentally Tested Concrete Slabs Subjected to Airblast

Augusto¹,

Mendonça²,

Urgessa

et al. 2021

Def. Sc. J.

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Study on Cellulose Acetate Butyrate/Plasticizer Systems by Molecular Dynamics Simulation and Experimental Characterization

Wang

Jin

et al. 2020

Polymers

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Cellulose acetate butyrate (CAB) is a widely used binder in polymer bonded explosives (PBXs). However, the mechanical properties of PBXs bonded with CAB are usually very poor, which makes the charge edges prone to crack. In the current study, seven plasticizers, including bis (2,2-dinitro propyl) formal/acetal (BDNPF/A or A3, which is 1:1 mixture of the two components), azide-terminated glycidyl azide (GAPA), n-butyl-N-(2-nitroxy-ethyl) nitramine (Bu-NENA), ethylene glycol bis(azidoacetate) (EGBAA), diethylene glycol bis(azidoacetate) (DEGBAA), trimethylol nitromethane tris (azidoacetate) (TMNTA) and pentaerythritol tetrakis (azidoacetate) [PETKAA], were studied for the plasticization of CAB. Molecular dynamics simulation was conducted to distinguish the compatibilities between CAB and plasticizers and to predict the mechanical properties of CAB/plasticizer systems. Considering the solubility parameters, binding energies and intermolecular radical distribution functions of these CAB/plasticizer systems comprehensively, we found A3, Bu-NENA, DEGBAA and GAPA are compatible with CAB. The elastic moduli of CAB/plasticizer systems follow the order of CAB/Bu-NENA>CAB/A3>CAB/DEGBAA>CAB/GAPA, and their processing property is in the order of CAB/Bu-NENA>CAB/GAPA>CAB/A3>CAB/DEGBAA. Afterwards, all the systems were characterized by FT-IR, differential scanning calorimetry (DSC), differential thermogravimetric analysis (DTA) and tensile tests. The results suggest A3, GAPA and Bu-NENA are compatible with CAB. The tensile strengths and Young’s moduli of these systems are in the order of CAB/A3>CAB/Bu-NENA>CAB/GAPA, while the strain at break of CAB/Bu-NENA is best, which are consistent with simulation results. Based on these results, it can be concluded that A3, Bu-NENA and GAPA are the most suitable plasticizers for CAB binder in improving mechanical and processing properties. Our work has provided a crucial guidance for the formulation design of PBXs with CAB binder.

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Emprego De Química Computacional Na Verificação E Validação Da Pressão De Detonação De Explosivo Plástico-PBX

Cited by 2 publications

References 8 publications

Finite Element Analysis of Experimentally Tested Concrete Slabs Subjected to Airblast

Finite Element Analysis of Experimentally Tested Concrete Slabs Subjected to Airblast

Study on Cellulose Acetate Butyrate/Plasticizer Systems by Molecular Dynamics Simulation and Experimental Characterization

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