scholarly journals Mechanical and failure bahaviour in carbon/epoxy composites

2002 ◽  
Vol 56 (9) ◽  
pp. 361-368 ◽  
Author(s):  
Momcilo Stevanovic ◽  
Danijela Sekulic-Pesikan
Keyword(s):  
Mechanical Properties ◽  
Flexural Modulus ◽  
Epoxy Composites ◽  
Elastic Behavior ◽  
Strength Analysis ◽  
Static Characteristics ◽  
Failure Initiation ◽  
Linear Elastic ◽  
Initiation And Propagation ◽  
Non Linear

A review of the mechanical properties and failure initiation and propagation in carbon/epoxy composites is presented. The results of the study of the macromechanical static characteristics, non-linear elastic behavior flexural modulus and shear properties of unidirectional composites (UDC), as well as, of tensile, compression and flexural moduli, strength analysis edge and hybrid effects in multidirectional composites (MDC) were discussed A discussion of the non-linear elastic behavior of carbon/epoxy UDC, the flexural moduli of both UDC and MDC, strength analysis and edge effects of laminates is emphasized.

Micromechanical Characterization of Gasb by Microbeam Deflecion and Using Nanoprobe and Finite Element Analysis

2003 ◽  
Vol 782 ◽  
Author(s):  
M. Ospina ◽  
S. R. Vangala ◽  
D. Yang ◽  
J. A. Sherwood ◽  
C. Sung ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Young’S Modulus ◽  
Gallium Antimonide ◽  
Young's Modulus ◽  
Elastic Behavior ◽  
Material System ◽  
Scaling Effects ◽  
Commercial Development ◽  
Linear Elastic

ABSTRACTThe commercial development of low-power electronics and electro-optics based on antimonides demands a better understanding of the mechanical properties of ternary and quaternary thin-film alloys fabricated from the InGaAlAsSbP material system. Of particular importance is the determination of Young's modulus of these materials. In this paper, a technique for studying the mechanical behavior of these thin films was developed by using microbeam bending and finite element modeling. The technique was successfully applied to investigate the mechanical properties of GaSb. A test structure consisting of an array of gallium antimonide microbeams was fabricated with lengths ranging from 50 to 500 μm long. The microbeams were deflected using a calibrated nanoprobe, thereby generating load-displacement curves. Young's modulus was then extracted from the data using beam bending theory and a finite element simulation of the structures under load. A total of five microbeams with the same trapezoidal cross-section and lengths of 80, 85, 200, 250 and 500 μm were tested to study the technique applicability and size scaling effects on the mechanical properties. It was observed that the 80 and 85 μm beams exhibited linear elastic behavior and the 200, 250, and 500 μm microbeams exhibited non-linear elastic behavior.

scholarly journals Mechanical Characterization of Epoxy Filled with Seed Shells as Reinforcement

2019 ◽  
Vol 8 (4) ◽  
pp. 6972-6977
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Sodium Hydroxide ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Flexural Modulus ◽  
Natural Fibers ◽  
Epoxy Composites ◽  
The Matrix ◽  
Sunflower Seed Shells

The use of natural fiber composite has been widely promoted in many industries such as construction, automotive and even aerospace. Natural fibers can be extracted from plants that are abundantly available in the form of waste such as sunflower seed shells (SSS) and groundnut shells (GNS). These fibers were chosen as the reinforcement in epoxy to form composites. The performance of composites was evaluated following the ASTM D3039 and ASTM D790 for tensile and flexural tests respectively. Eight types of composites were prepared using SSS and GNS fibers as reinforcement and epoxy as the matrix with the fiber content of 20wt %. The fibers were untreated and treated with Sodium Hydroxide (NaOH) at various concentrations (6%, 10%, 15%, and 20%) and soaking time (24, 48 and 72 hours). The treatment has successfully enhanced the mechanical properties of both composites, namely SSS/epoxy and GNS/epoxy composites. The SSS/epoxy composite has the best mechanical properties when the fibers were treated for 48 hours using 6% of NaOH that produced 22 MPa and 13 MPa of tensile and flexural strength respectively. Meanwhile, the treatment on groundnut shells with 10% sodium Hydroxide for 24 hours has increased the Flexural strength tremendously (53%), however no significant effect on the tensile strength. The same trend was also observed on the tensile and flexural modulus. The increase of 41% in flexural modulus after treatment with 10% NaOH for 24 hours was also the evidence of mechanical properties enhancement. The evidence of improved fiber and matrix bonding after fiber treatment was also observed using a scanning electron microscope (SEM). The SSS/epoxy composites performed better in tensile application, meanwhile the GNS/epoxy composites are good in flexural application.

Non-linear elastic behavior of light fibrous materials

1999 ◽  
Vol 12 (1) ◽  
pp. 157-162 ◽  
Author(s):  
M. Baudequin ◽  
G. Ryschenkow ◽  
S. Roux
Keyword(s):  
Elastic Behavior ◽  
Fibrous Materials ◽  
Linear Elastic ◽  
Non Linear

scholarly journals A Sensitivity Analysis-Based Parameter Optimization Framework for 3D Printing of Continuous Carbon Fiber/Epoxy Composites

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3961 ◽  
Author(s):  
Hong Xiao ◽  
Wei Han ◽  
Yueke Ming ◽  
Zhongqiu Ding ◽  
Yugang Duan
Keyword(s):  
Mechanical Properties ◽  
Sensitivity Analysis ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Flexural Modulus ◽  
Epoxy Composites ◽  
Optimization Framework ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Epoxy ◽  
Printing Parameters

Three-dimensional printing of continuous carbon fiber/epoxy composites (CCF/EPCs) is an emerging additive manufacturing technology for fiber-reinforced polymer composites and has wide application prospects. However, the 3D printing parameters and their relationship with the mechanical properties of the final printed samples have not been fully investigated in a computational and quantifiable way. This paper presents a sensitivity analysis (SA)-based parameter optimization framework for the 3D printing of CCF/EPCs. A surrogate model for a process parameter–mechanical property relationship was established by support vector regression (SVR) analysis of the experimental data on flexural strength and flexural modulus under different process parameters. An SA was then performed on the SVR surrogate model to calculate the importance of each individual 3D printing parameter on the mechanical properties of the printed samples. Based on the SA results, the optimal 3D printing parameters and the corresponding flexural strength and flexural modulus of the printed samples were predicted and verified by experiments. The results showed that the proposed framework can serve as a high-accuracy tool to optimize the 3D printing parameters for the additive manufacturing of CCF/EPCs.

scholarly journals Calculation of Linear and Non-Linear Elastic Properties of Polycrystalline Materials by Use of a Cluster Model

1997 ◽  
Vol 28 (3-4) ◽  
pp. 261-271 ◽  
Author(s):  
H. Kiewel ◽  
H. J. Bunge ◽  
L. Fritsche
Keyword(s):  
Elastic Properties ◽  
Grain Shape ◽  
Cluster Method ◽  
Elastic Behavior ◽  
Polycrystalline Materials ◽  
Linear Elastic ◽  
Effective Elastic Constants ◽  
Real Material ◽  
Non Linear ◽  
Effective Constants

In the present paper we have put together some results of a cluster method that allows the calculation of linear and also non-linear effective elastic constants of polycrystalline materials within an iterative self-consistent scheme. The conceptual idea consists in simulating the real material by a suitably chosen cluster of single grains. One can then determine the elastic properties of the material under study by examining the elastic behavior of the cluster. The method is capable of resolving the effect of the grain shape, that is determined by the coordination number of the grains on the effective constants.

Intrinsic failure and non-linear elastic behavior of glasses

2005 ◽  
Vol 351 (27-29) ◽  
pp. 2324-2328 ◽  
Author(s):  
Prabhat K. Gupta ◽  
Charles R. Kurkjian
Keyword(s):  
Elastic Behavior ◽  
Linear Elastic ◽  
Non Linear

Non-linear elastic behavior of hexagonal silicon carbide

2014 ◽  
Vol 251 (6) ◽  
pp. 1186-1191 ◽  
Author(s):  
Sindu Jones ◽  
Chooracactu Sukumara Menon
Keyword(s):  
Silicon Carbide ◽  
Elastic Behavior ◽  
Linear Elastic ◽  
Non Linear
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