Year-end Sale % OFF 
Abstract
According to the randomness of the spatial distribution and shape of the internal cells of closed-cell foam aluminum and based on the Voronoi algorithm, we use ABAQUS to model the random polyhedrons of pore cells firstly. Then, the algorithm of generating aluminum foam with random pore size and random wall thickness is written by Python and Fortran, and the mesh model of random polyhedral particles and random wall thickness was established by the algorithm read in by TrueGrid software. Finally, the mesh model is impo rted into the LS-DYNA software to remove the random polyhedron part of the pore cell. Compared with the results of scanning electron microscopy and antiknock test, the morphology and properties of the model are close to those of the real aluminum foam material, and the coincidence degree is more than 91.4%. By means of numerical simulation, the mechanism of the wall deformation, destruction of closed-cell aluminum foams, and the rapid attenuation of explosion stress wave after the interference of reflection and transmission of bubbles were studied and revealed. It is found that aluminum foam deformation can be divided into four areas: collapse area, fracture area, plastic deformation area, and elastic deformation region. Therefore, the explosion resistance is directly related to the cell wall thickness and bubble size, and there is an optimal porosity rule for aluminum foam antiknock performance.
Highlights
Closed-cell aluminum foams are a kind of porous metal material, which is composed of thousands of random 3D polyhedral pores embedded in continuous aluminum or aluminum alloy matrix
On the basis of the three-dimensional micromechanical model, the influence of the micromechanical structure of aluminum foam is considered, and the performance of aluminum foam under the blast impact load is studied. e following conclusions can be drawn: (1) Based on the Voronoi algorithm, firstly, the 2-random polyhedron model is established by using ABAQUS, and its geometric features are extracted. en, by using Python language and Fortran language synthetically, the algorithm of generating aluminum foam with random pore size and wall thickness is written, and the grid model is established by the algorithm read in by TrueGrid software
The part of the particles is removed to generate the aluminum foam model. en, the energy absorption mechanism and porosity of the sandwich structure with aluminum foam core are explored under the action of explosion load, and the reliable results can be obtained, which are in good agreement with the test results
Summary
Closed-cell aluminum foams are a kind of porous metal material, which is composed of thousands of random 3D polyhedral pores embedded in continuous aluminum or aluminum alloy matrix. E second is to comprehensively use the Python language and Fortran language to write a three-dimensional random aluminum pore size and random wall thickness foam aluminum generation algorithm, so that the aluminum foam cell wall thickness is random, through the TrueGrid software reading algorithm, the establishment of random polyhedron particles, and random wall thickness grid model. Using the Python language and Fortran language comprehensively, a random algorithm of random cell wall thickness is written to obtain the cell wall as shown, and the size of the pore size is finely adjusted by the cell wall thickness At this point, the geometric model of the two-dimensional aluminum foam and the cell wall is generated. Use TrueGrid software to read in the random pores and random cell wall foam aluminum algorithm, extract geometric features, and use the mapping grid method to build a grid model of random polyhedral particles and random wall thickness. According to the research results, the maximum failure strain of aluminum foam in this paper is 0.37 [37]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
