Enhancing indentation and impact resistance in auxetic composite materials

2020 ◽  
Vol 198 ◽  
pp. 108229 ◽  
Author(s):  
Tiantian Li ◽  
Fan Liu ◽  
Lifeng Wang
Keyword(s):  
Composite Materials ◽  
Impact Resistance

scholarly journals Raising anti-shock performance of epoxy organic plastics

2020 ◽  
pp. 67-68
Author(s):  
E. V. Kupriyanova ◽  
T. V. Morozova ◽  
A. M. Dvortsevaya ◽  
V. S. Osipchyk ◽  
K. Y. Kolybanov
Keyword(s):  
Composite Materials ◽  
Impact Resistance ◽  
Epoxy Binders ◽  
Aramid Fabrics

The analysis of fracture of composite materials based on aramid fabrics and epoxy binders with different viscosities under impact is carried out. The dependence of impact resistance on the location of the reinforcing elements and the viscosity of the binder is shown.

scholarly journals Assessment of the Impact Resistance of a Composite Material with EN AW-7075 Matrix Reinforced with α-Al2O3 Particles Using a 7.62 × 39 mm Projectile

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 769 ◽  
Author(s):  
Adam Kurzawa ◽  
Dariusz Pyka ◽  
Krzysztof Jamroziak ◽  
Marcin Bajkowski ◽  
Miroslaw Bocian ◽  
...  
Keyword(s):  
Composite Materials ◽  
Matrix Material ◽  
Impact Resistance ◽  
Constitutive Models ◽  
Pressure Infiltration ◽  
Destruction Mechanism ◽  
Al2o3 Particles ◽  
Α Al2o3 ◽  
Protective Structures ◽  
The Impact

The paper presents the results of studies on the effects of shooting composite materials produced by pressure infiltration with the EN AW-7075 alloy as a matrix and reinforcement in the form of preforms made of α-Al2O3 particles. Composite materials were made with two reinforcement contents (i.e., 30% and 40% vol. of α-Al2O3 particles). The composites produced in the form of 12 mm thick plates were subjected to impact loads from a 7.62 × 39 FMJ M43 projectile fired from a Kalashnikov. The samples of composites with different contents of strengthening particles were subjected to detailed microscopic examination to determine the mechanism of destruction. The effect of a projectile impact on the microstructure of the material within the perforation holes was identified. There were radial cracks found around the puncture holes and brittle fragmentation of the front surfaces of the specimens. The change in the volume of the reinforcement significantly affected the inlet, puncture and outlet diameters. The observations confirmed that brittle cracking dominated the destruction mechanism and the crack propagation front ran mainly in the matrix material and along the boundaries of the α-Al2O3 particles. In turn, numerical tests were conducted to describe the physical phenomena occurring due to the erosion of a projectile hitting a composite casing. They were performed with the use of the ABAQUS program. Based on constitutive models, the material constants developed from the identification of material properties were modelled and the finite element was generated from homogenization in the form of a representative volume element (RVE). The results of microscopic investigations of the destruction mechanism and numerical investigations were combined. The conducted tests and analyses shed light on the application possibilities of aluminium composites reinforced with Al2O3 particles in the construction of add-on-armour protective structures.

scholarly journals Bioinspired Design of Building Materials for Blast and Ballistic Protection

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Yu-Yan Sun ◽  
Zhi-Wu Yu ◽  
Zi-Guo Wang
Keyword(s):  
Composite Materials ◽  
Building Materials ◽  
Impact Resistance ◽  
Absorption Capacity ◽  
Major Constituent ◽  
Major Contributor ◽  
Energy Absorption Capacity ◽  
High Toughness ◽  
Ballistic Protection ◽  
Abalone Shell

Nacre in abalone shell exhibits high toughness despite the brittle nature of its major constituent (i.e., aragonite). Its specific structure is a major contributor to the energy absorption capacity of nacre. This paper reviews the mechanisms behind the performance of nacre under shear, uniaxial tension, compression, and bending conditions. The remarkable combination of stiffness and toughness on nacre can motivate the development of bioinspired building materials for impact resistance applications, and the possible toughness designs of cement-based and clay-based composite materials with a layered and staggered structure were discussed.

Research on the Design and Use of Structures and Components Made from Fibre Composite Materials

2012 ◽  
Vol 174-177 ◽  
pp. 782-786
Author(s):  
Peng Wang
Keyword(s):  
Compressive Strength ◽  
Composite Materials ◽  
Carbon Fibre ◽  
Fire Resistance ◽  
Glass Fibre ◽  
Chemical Resistance ◽  
Fibre Composite ◽  
Impact Resistance ◽  
Short Term ◽  
Staff Shortage

Fibres composite materials designed as glass fibre, carbon fibre and aramid fibre. They were used for chemical resistance, compressive strength, stiffness, impact resistance, and fire resistance. However, they had a number of limitations, including vandalism, accidental damage, short-term durability, high cost, and suitably qualified staff shortage. These problems could be solved by appropriate monitoring, suitably qualified designers and contractors. The design and use of fibre composite materials has become an important aspect of engineering.

Experimental Investigation on Buckling Analysis of Woven Glass Fiber/Epoxy Laminated Composite Materials

2015 ◽  
Vol 766-767 ◽  
pp. 150-155
Author(s):  
S. Sivasaravanan ◽  
V.K. Bupesh Raja ◽  
Sathishkumar
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
Composite Structures ◽  
Impact Resistance ◽  
Laminated Composite ◽  
Composite Plates ◽  
Buckling Analysis ◽  
Structural Components ◽  
Laminated Composite Materials ◽  
Woven Glass Fiber

The structural components made from the composite materials possess outstanding advantages like reliable mechanical properties, durability, and good corrosion resistance, and low density. They also exhibit high impact resistance and good damage tolerance. These merits of composite structures draw the attention of scientists, engineers and researchers in generally the stability of composite structures is verified by carrying out buckling analysis. The aircraft components are made up of laminated composite plates are subjected to buckling analysis, in order to confirm whether the component withstand the critical in plane loads. Composite structural plates provided with circular cut out, square cut out and rectangular cut-out are widely used as structural members in aircraft and vehicle design. The different holes are provided in these members can be access holes, pass-through holes for any hardware or holes for windows and doors. Sometimes these holes are produced for weight reduction in the composite structural components. In this present study, buckling experiments were carried out on Epoxy/woven glass fiber laminated composite plate specimens and the influence of different cut-out shapes like circular, square and rectangle are examined and determined experimentally. Boundary conditions free and clamped were considered for all the experiments. After the buckling experiments, comparisons were made between these two test results. These results show the effect of various cut-out shapes on the buckling load.

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