Axial and radial compressive properties of alumina-aluminum matrix syntactic foam filled thin-walled tubes

2019 ◽  
Vol 226 ◽  
pp. 111197 ◽  
Author(s):  
Mingming Su ◽  
Han Wang ◽  
Hai Hao
Keyword(s):  
Syntactic Foam ◽  
Aluminum Matrix ◽  
Compressive Properties ◽  
Foam Filled ◽  
Thin Walled

Bending behavior of cenosphere aluminum matrix syntactic foam-filled circular tubes

2021 ◽  
Vol 243 ◽  
pp. 112650
Author(s):  
Boyi Zhang ◽  
Jian Zhang ◽  
Li Wang ◽  
Yuexin Jiang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Syntactic Foam ◽  
Aluminum Matrix ◽  
Circular Tubes ◽  
Bending Behavior ◽  
Foam Filled

Microstructure and Compressive Properties of Al/Al2O3 Syntactic Foams

2018 ◽  
Vol 933 ◽  
pp. 174-181 ◽  
Author(s):  
Ming Ming Su ◽  
Han Wang ◽  
Kai Yan Li ◽  
Hai Hao
Keyword(s):  
Hollow Spheres ◽  
Shear Bands ◽  
Syntactic Foam ◽  
Aluminum Matrix ◽  
Strain Curve ◽  
Stir Casting ◽  
Low Density ◽  
Syntactic Foams ◽  
Compressive Properties ◽  
Continuous Contact

Metal matrix syntactic foams with relativity low density (2.03 g/cm3) were prepared by stir casting method. The syntactic foam is comprised of alumina hollow spheres with a diameter range of 1.0-1.5 mm as reinforcement and ZL111 aluminum alloy as matrix. Calcium particles are used to increase the viscosity of the melt to ensure that low density hollow spheres are immersed in the melt. Microstructure characteristics and quasi-static compressive properties of syntactic foams were studied. The hollow spheres were uniformly distributed in the aluminum matrix, and the interface between them was in continuous contact. Compressive stress-strain curve exhibits three distinct stages of deformation: (i) the linear elastic stage; (ii) the plateau area; (iii) final densification stage. The compression strength and plateau stress are 85 MPa and 75 MPa, respectively. The main reasons for the sample failure are the collapse of hollow spheres and the formation of multiple shear bands.

Quasi-static Compressive Properties and Behavior of Single-cell Miura Origami Column Fabricated by 3D Printed PLA Material

2020 ◽  
Vol 3 (2) ◽  
pp. 66-73
Author(s):  
Farid Triawan ◽  
Geraldy Cahya Denatra ◽  
Djati Wibowo Djamari
Keyword(s):  
Single Cell ◽  
Peak Stress ◽  
Absorption Capacity ◽  
Compression Tests ◽  
Compressive Properties ◽  
Folding Pattern ◽  
Column Structure ◽  
Thin Walled ◽  
And Behavior ◽  
Initial Peak

The study of a thin-walled column structure has gained much attention due to its potential in many engineering applications, such as the crash box of a car. A thin-walled square column usually exhibits high initial peak force, which may become very dangerous to the driver or passenger. To address this issue, introducing some shape patterns, e.g., origami folding pattern, to the column may become a solution. The present work investigates the compressive properties and behavior of a square box column structure which adopts the Miura origami folding pattern. Several test pieces of single-cell Miura origami column with varying folding angle and layer height are fabricated by a 3D printer. The filament is made of Polylactic Acid (PLA), which is a brittle material. Then, compression tests are carried out to understand its compressive mechanical properties and behavior. The results show that introducing a Miura origami pattern to form a thin-walled square column can dramatically lower down the initial peak stress by 96.82% and, at the same time, increase its ductility, which eventually improves the energy absorption capacity by 61.68% despite the brittle fracture behavior.

Preparation and Characteristic of Different Hollow Microspheres Filled Syntactic Foams

2014 ◽  
Vol 809-810 ◽  
pp. 237-242
Author(s):  
Xin Jin ◽  
He Yi Ge ◽  
Ping Wang ◽  
Zhong Yuan Pan ◽  
Juan Chen
Keyword(s):  
Interfacial Adhesion ◽  
Syntactic Foam ◽  
Weight Fraction ◽  
Hollow Microspheres ◽  
Syntactic Foams ◽  
Polystyrene Microspheres ◽  
Compressive Properties ◽  
Hollow Glass Microspheres ◽  
Important Improvement ◽  
The Impact

In this study, hollow glass microspheres (HGM) and hollow polystyrene microspheres (HPSM) have been employed as fillers in epoxy resin to prepare the syntactic foam. A kind of good performance composite was prepared. The effects of presence of various hollow microspheres on the impact and compressive properties of syntactic foams are studied. Weight fraction of HPSM and HGM for the syntactic foams varies up to 2.0 wt% and 25 wt%, respectively. The results show that the coupling agent can induce the interfacial adhesion between the HGM and the resin and help HGM uniformly disperse in the resin and hence result in better mechanical properties of composite. On the other hand, the effect of HPSM for the composite density is greater than that of HGM. The addition of a small percentage of HPSM helps produce an important improvement in the low density of syntactic foam. The syntactic foam has uniform stability component and the excellent integrative performances. Fabricated syntactic foams had compression strength of 51.96 MPa and density of 0.671 g/cm3.

scholarly journals Study on the Composite Structure of Aluminum Foam-Filled Thin-Walled Metal Tube to Reduce the Charge Overload inside the Projectile during the Penetration Process

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Fudi Liang ◽  
Zengyou Liang ◽  
Dezhi Deng
Keyword(s):  
Reinforced Concrete ◽  
Stress Analysis ◽  
Composite Structure ◽  
High Speed ◽  
Aluminum Foam ◽  
Metal Tube ◽  
Penetration Process ◽  
Mathematical Expressions ◽  
Foam Filled ◽  
Thin Walled

When a projectile penetrates a target at high speed, the charge loaded inside the projectile usually bears a high overload, which will consequently severely affect its performance. In order to reduce the overload of the charge during the penetration process, the structure of the projectile was improved by adding two buffers at both ends of the charge. In this study, the mathematical expressions were first gained about the axial buffering force generated by the thin-walled metal tube, aluminum foam, and the composite structure of aluminum foam-filled thin-walled metal tube when they were impacted by the high-speed mass block through reasonable assumptions and stress analysis. During the experiment on the high-speed projectile penetrating reinforced concrete target, the acceleration curve of the charge and the projectile body were obtained. The results show that the maximum overload that the charge was subjected to during the launch and penetration process was significantly reduced, and the change in overload, which the charge was subjected to during the penetration process, was also less obvious.

Modeling and optimization of foam-filled thin-walled columns for crashworthiness designs

2010 ◽  
Vol 46 (9) ◽  
pp. 698-709 ◽  
Author(s):  
Jing Bi ◽  
Hongbing Fang ◽  
Qian Wang ◽  
Xuchun Ren
Keyword(s):  
Modeling And Optimization ◽  
Foam Filled ◽  
Thin Walled

Compressive Stress of Syntactic Foam: Effect of rNBR Particles Reinforced Epoxy Macrospheres (rNBR-EM)

2018 ◽  
Vol 280 ◽  
pp. 301-307
Author(s):  
Z. Zakaria ◽  
C.Y. Yao
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Compressive Stress ◽  
Energy Absorption ◽  
Wall Thickness ◽  
Syntactic Foam ◽  
Radius Ratio ◽  
Butadiene Rubber ◽  
Syntactic Foams ◽  
Compressive Properties

This research focuses on the effect of rejected nitrile butadiene rubber (rNBR) gloves particles reinforced epoxy macrospheres (EM) on the physical properties and compressive stress of syntactic foam. Adding rNBR particles on the surface of macrospheres can increase the energy absorption as a result of improving the compressive properties of syntactic foam. Three types of macrospheres have been produced for the fabrication of syntactic foam, namely EM without rNBR, 1-layer rNBR-EM and 2-layer rNBR-EM. The results showed that increased rNBR particles layer on macrospheres has increased the wall thickness, and reduced the radius ratio of macrospheres as well as increased the density of syntactic foams. The compressive strength and modulus of syntactic foam with 2-rNBR-EM increased compared to the syntactic foams of 1-rNBR-EM and EM without rNBR. In addition, the toughness of the 2-rNBR-EM increased compared to the syntactic foams of 1-rNBR-EM and EM without rNBR.

scholarly journals Energy Absorption of Aluminium Extrusions Filled with Cellular Materials Under Axial Crushing: Study of the Interaction Effect

2020 ◽  
Vol 10 (23) ◽  
pp. 8510
Author(s):  
Javier Paz ◽  
Miguel Costas ◽  
Jordi Delgado ◽  
Luis Romera ◽  
Jacobo Díaz
Keyword(s):  
Energy Dissipation ◽  
Cross Sections ◽  
Interaction Effect ◽  
Unit Volume ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Polymeric Foam ◽  
Axial Crushing ◽  
Foam Filled ◽  
Thin Walled

This investigation focuses on the interaction effect during the quasi-static axial crushing of circular and square thin-walled aluminium extrusions filled with polymeric foam or cork. The increment in the absorbed energy due to interactions between materials was assessed using a validated numerical model calibrated with experimental material data. Simulations were run with variable cross-section dimensions, thickness, and foam density. The results were used to adjust the parameters of design formulas to predict the average crush forces of foam- and cork-filled thin-walled tubes. The analysis of the energy dissipation per unit volume revealed that the highest increments due to the interaction between materials appeared in the foam-filled square extrusions. Energy dissipation increased with higher density foams for both cross-sections due to a stronger constraint of the aluminium walls, and thus a reduction of the folding length. Thinner tube walls also delivered a higher improvement in the energy dissipation per unit volume than those with thicker walls. The contribution of friction was also quantified and investigated.

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