Young's modulus of reinforced composites

1992 ◽  
Vol 2 (4) ◽  
pp. 277-288
Author(s):  
B.B. Sharma ◽  
Rajesh Sharma
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Reinforced Composites

scholarly journals Modified rule of mixtures and Halpin–Tsai model for prediction of tensile strength of micron-sized reinforced composites and Young’s modulus of multiscale reinforced composites for direct extrusion fabrication

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878528 ◽  
Author(s):  
Zirong Luo ◽  
Xin Li ◽  
Jianzhong Shang ◽  
Hong Zhu ◽  
Delei Fang
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Carbon Fibers ◽  
Epoxy Resins ◽  
Young's Modulus ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Rule Of Mixtures ◽  
Combined Use

A modified rule of mixtures is required to account for the experimentally observed nonlinear variation of tensile strength. A modified Halpin–Tsai model was presented to predict the Young’s modulus of multiscale reinforced composites with both micron-sized and nano-sized reinforcements. In the composites, both micron-sized fillers—carbon fibers—and nano-sized fillers—rubber nanoparticles and carbon nanotubes—are added into the epoxy resin matrix. Carbon fibers can help epoxy resins increase both the tensile strength and Young’s modulus, while rubber nanoparticles and carbon nanotubes can improve the toughness without sacrificing other properties. Mechanical experiments and scanning electron microscopy observations were used to study the effects of the micron-sized and nano-sized reinforcements and their combination on tensile and toughness properties of the composites. The results showed that the combined use of multiscale reinforcements had synergetic effects on both the strength and the toughness of the composites.

scholarly journals Sugarcane Bagasse Reinforced Composites: Studies on the Young’s Modulus and Macro and Micro-Mechanics

BioResources ◽  
2017 ◽  
Vol 12 (2) ◽  
Author(s):  
Ana M. Jiménez ◽  
Marc Delgado-Aguilar ◽  
Quim Tarrés ◽  
Germán Quintana ◽  
Pere Fullana-i-Palmer ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Sugarcane Bagasse ◽  
Young's Modulus ◽  
Reinforced Composites

scholarly journals Mechanical and Hydrothermal Aging Behaviour of Polyhydroxybutyrate-Co-Valerate (PHBV) Composites Reinforced by Natural Fibres

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3538 ◽  
Author(s):  
Karolina Mazur ◽  
Stanisław Kuciel
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Interfacial Adhesion ◽  
Saline Solution ◽  
Young's Modulus ◽  
Morphological Aspect ◽  
Reinforced Composites ◽  
Wood Fibers ◽  
Hydrothermal Aging ◽  
Biodegradable Composites

Biodegradable composites based on poly (3-hydroxybutyrate-co-3-hydroxyvalerate), reinforced with 7.5% or 15% by weight of wood fibers (WF) or basalt fibers (BF) were fabricated by injection molding. BF reinforced composites showed improvement in all properties, whereas WF composites showed an increase in Young’s modulus values, but a drop in strength and impact properties. When compared with the unmodified polymer, composites with 15% by weight of BF showed an increase of 74% in Young’s modulus and 41% in impact strength. Furthermore, the experimentally measured values of Young’s modulus were compared with values obtained in various theoretical micromechanical models. The Haplin-Kardas model was found to be in near approximation to the experimental data. The morphological aspect of the biocomposites was studied using scanning electron microscopy to obtain the distribution and interfacial adhesion of the fibers. Additionally, biodegradation tests of the biocomposites were performed in saline solution at 40 °C by studying the weight loss and mechanical properties. It was observed that the presence of fibers affects the rate of water absorption and the highest rate was seen for composites with 15% by weight of WF. This is dependent on the nature of the fiber. After both the first and second weeks mechanical properties decreased slightly about 10%.

Mechanical Properties and Applications of Carbon Nanotubes

2011 ◽  
Vol 295-297 ◽  
pp. 1516-1521 ◽  
Author(s):  
Li Bao An ◽  
Li Jia Feng ◽  
Chun Guang Lu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Experimental Measurements ◽  
Reinforced Composites ◽  
Mechanical Behaviors ◽  
Theoretical Predictions

This paper presents a review of current research, both theoretical predictions and experimental measurements, on the mechanical properties of carbon nanotubes (CNTs). The emphasis has been given to the tensile strength and Young’s modulus. Deformabilities including buckling, bending, and twisting are also examined. The predicted and measured values of mechanical behaviors of CNTs are compared and an analysis on the variation of the values is made. The challenges facing the research of mechanical properties of CNTs are stated. CNT reinforced composites are involved as well in the paper. A thorough understanding of the properties of CNTs helps exploring full applications of this unique group of materials.

scholarly journals Experimental Characterization of Short Fiber-Reinforced Composites on the Mesoscale by Indentation Tests

2021 ◽  
Author(s):  
Natalie Rauter ◽  
Rolf Lammering
Keyword(s):  
Young’S Modulus ◽  
Material Properties ◽  
Young's Modulus ◽  
Short Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Indentation Tests ◽  
Fiber Reinforced Material

AbstractIndentation tests are widely used to characterize the material properties of heterogeneous materials. So far there is no explicit analysis of the spatially distributed material properties for short fiber-reinforced composites on the mesoscale as well as a determination of the effective cross-section that is characterized by the obtained measurement results. Hence, the primary objective of this study is the characterization of short fiber-reinforced composites on the mesoscale. Furthermore, it is of interest to determine the corresponding area for which the obtained material parameters are valid. For the experimental investigation of local material properties of short fiber-reinforced composites, the Young’s modulus is obtained by indentation tests. The measured values of the Young’s modulus are compared to results gained by numerical simulation. The numerical model represents an actual microstructure derived from a micrograph of the used material. The analysis of the short fiber-reinforced material by indentation tests reveals the layered structure of the specimen induced by the injection molding process and the oriented material properties of the reinforced material are observed. In addition, the experimentally obtained values for Young’s modulus meet the results of a corresponding numerical analysis. Finally, it is shown, that the area characterized by the indentation test is 25 times larger than the actual projected area of the indentation tip. This leads to the conclusion that indentation tests are an appropriate tool to characterize short fiber-reinforced material on the mesoscale.

scholarly journals Damping Properties of Flax/Carbon Hybrid Epoxy/Fibre-Reinforced Composites for Automotive Semi-Structural Applications

Fibers ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 64
Author(s):  
George Fairlie ◽  
James Njuguna
Keyword(s):  
Carbon Fibre ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Fibre Orientation ◽  
Damping Ratio ◽  
Testing Machine ◽  
Reinforced Composites ◽  
Damping Properties ◽  
Structural Applications ◽  
Fibre Reinforced Composites

The ever-increasing demand for environmentally friendly biocomposites for use in various engineering applications requires a strong understanding of these materials properties, especially in automotive applications. This study focused on investigating how the stacking sequence and fibre orientation impacts the damping properties of hybrid flax/carbon fibre-reinforced composites. Different hybrid carbon fibre/flax fibre-reinforced composites using epoxy resin as the matrix were manufactured using vacuum-assisted resin infusion moulding technique. Each composite material was then tested for tensile properties using a universal testing machine, and the damping experiment was conducted using an impulse hammer and a Laser Doppler Vibrometer. The tensile study found out that adding a flax layer to the external layers of carbon fibre laminate reduced Young’s modulus by 28% for one layer and 45% for two layers. It was noted that when the fibre orientation of the internal layer of [C/F2/C]s was replaced with two ±45° layers, this had a very little effect on Young’s modulus but reduced the ultimate tensile strength by 61%. This experimental study also showed that the most important layer when it comes to damping properties is the external layers. By adding an external flax layer into an epoxy/carbon fibre-reinforced composite considerably enhanced its damping ratio by 53.6% and by adding two layers increased it by 94%. The results indicated a high potential for the automotive semi-structural applications to improve damping properties of the vehicle.

Stress Field of Fiber-Reinforced Composites with Graded Interphase

2007 ◽  
Vol 353-358 ◽  
pp. 1435-1438
Author(s):  
Zhi Ying Ou ◽  
Dong Xia Lei
Keyword(s):  
Stress Field ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Simplified Approach ◽  
Constituent Phase ◽  
Polar Radius ◽  
Longitudinal Modulus

A simplified approach for calculating the stress field of the fiber-reinforced composites is developed to improve the work of Theocaris et al. (1985) in this paper. This approach considers that the main factor affecting the stress field of composites is the existence of interphase between fiber and matrix, which possesses different Young’s modulus than those of the constituent phase. A parabolic law is adopted for the variation of Young’s modulus of graded interphase, versus the polar radius from fiber to matrix, while the Poisson’s ratio of the interphase is assumed as constant. Space axisymmetric model is applied to the Representative Volume Element (RVE) of the fiber-reinforced composites to evaluate stress field of the composites. Also, the effective longitudinal modulus of the fiber-reinforced composite can be obtained.

Sign in / Sign up

Export Citation Format

Share Document