Numerical analysis of the influence of the blast wave on the composite structure

Ogierman, Witold; Kokot, Grzegorz

doi:10.5755/j01.mech.20.2.6946

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…The mechanical properties of the CNT/EP composites are generally determined by the EP and CNTs, including the weight fraction and geometric parameters (aspect ratio, diameter) of CNTs. First, 3D RVE (Figure a) of the CNT BP with randomly distributed CNTs at nanoscale was created based on mean‐field homogenization theory, which was implemented in Digimat‐FE software (Version 6.1.1, e‐Xstream Engineering, Belgium). Where, CNTs were assumed as cylinders, with average aspect ratio and weight fraction of 500 and 22 wt%, respectively.…”

Section: Methodsmentioning

confidence: 99%

Tensile Mechanical Behaviors of High Loading of Carbon Nanotube/Epoxy Composites via Experimental and Finite Element Analysis

Shen

Liu

2019

Adv Eng Mater

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This article aims to explore the tensile behaviors of a randomly distributed carbon nanotube (CNT) reinforced epoxy (EP) composite with high CNT loading by experimental and finite element analysis (FEA). The CNT/EP with CNT loading of 22-25 wt% is prepared by resin-film infusion process. The obtained tensile strength and modulus of the as-prepared CNT/EP are increased by 141.7% and 175.3%, respectively, compared with the blank EP. When the CNT/EP prepreg (uncured) is prestretched with a tensile deformation of 2.5% to improve the alignment of CNTs, the yielded tensile strength and modulus of the cured composite are further improved by 6.3% and 10.8%. FEA result reveals that CNTs are the main stress carriers, and the maximum stress level undertaken by CNTs is 23-fold that of EP matrix. Also, the carrying capacity of CNTs is closely correlative to their alignments, when the orientation angle between CNTs' axes and loading direction is changed from 0 to 61 , CNTs bear continuously decreasing tensile stress; otherwise (61 to 90), CNTs undertake increasing compressive stress. Moreover, CNTs affect their nearby stress fields within EP in a distance of 50-60 nm, which proves that stress can be effectively transferred from EP matrix to CNTs.

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Section: Methodsmentioning

confidence: 99%

Tensile Mechanical Behaviors of High Loading of Carbon Nanotube/Epoxy Composites via Experimental and Finite Element Analysis

Shen

Liu

2019

Adv Eng Mater

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“…Behavior of a composite sandwich panel against blast wave was also predicted through the same approach, and trinitrotoluene charge and resulting blast wave were discretized by SPH particles [72]. Behavior of gaseous products of detonation was described by the conservation equations and the Jones-Wilkins-Lee equation of state.…”

Section: Other Impact Problemsmentioning

confidence: 99%

Application of particle simulation methods to composite materials: a review

Yashiro

2016

Advanced Composite Materials

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Particle simulation methods represent deformation of an object by motion of particles, and their Lagrangian and discrete nature is suitable for explicit modeling of the microstructure of composite materials. They also facilitate handling of large deformation, separation, contact and coalescence. Mesh-free particle methods will thus be appropriate for a part of issues throughout the lifecycle of composite materials despite their high calculation cost. This study focuses on three particle simulation methods, namely, smoothed particle hydrodynamics, moving particle semi-implicit method, and discrete element method, and reviews approaches for modeling composite materials through these methods. Applicability of each method as well as advantages and drawbacks will be discussed from the viewpoint of engineering of composite materials. This reviewing study suggests capability of particle simulation methods to handle multiphysics and to predict various complex phenomena that necessitate explicit modeling of the material's microstructure consisting of reinforcements (inclusions), matrix, and voids.

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“…This equation is untangled with spatial discretization using the finite element method, which resulted in discrete systems of equations for the motion and deformation of the object in the blanking process. For the purposes of the solution to the present problem, the central difference method, which is also known as the explicit integration method, is used [28].…”

Section: Numerical Modelingmentioning

confidence: 99%

Numerical Investigations of the Effect of Process Parameters on Residual Stresses, Strains and Quality of Final Product in Blanking Using SPH Method

Bohdal

Kułakowska

Patyk

et al. 2016

MSF

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The shearing process such as the blanking of sheet metals has been used often to prepare workpieces for subsequent forming operations. This process consists in separating a blank from a sheet by means of a high-localized shear deformation due to the action of a punch. Blanking modelling is becoming an increasingly important tool in gaining understanding and improving this process. At the moment a fundamental problem in numerical modelling of blanking processes is an excessive element distortion in a finite-element simulation. In this study, we present a hybrid modelling approach, SPH (smoothed particle hydrodynamics) coupled FEM method to simulate the blanking process. This new approach involves several advantages compared to the traditional finite element method for example: neglect mesh tangling and distortion problems, does not need to use material separation criterion. The physical, mathematical and computer model of the process is elaborated. The application in ANSYS/LS-DYNA program is developed. The examination and analysis of influence of process technological parameters for example: the clearance, tool geometry, blanking velocity on residual stresses, strains and quality of final product using the SPH method is analyzed. The results of computer simulations can be used to forecasting quality of the parts optimization.

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Numerical analysis of the influence of the blast wave on the composite structure

Cited by 4 publications

References 10 publications

Tensile Mechanical Behaviors of High Loading of Carbon Nanotube/Epoxy Composites via Experimental and Finite Element Analysis

Tensile Mechanical Behaviors of High Loading of Carbon Nanotube/Epoxy Composites via Experimental and Finite Element Analysis

Application of particle simulation methods to composite materials: a review

Numerical Investigations of the Effect of Process Parameters on Residual Stresses, Strains and Quality of Final Product in Blanking Using SPH Method

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