An Elastic-Plastic Fracture Behavior of the Interface Using the Property Gradient in MMC

2005 ◽  
Vol 297-300 ◽  
pp. 148-153 ◽  
Author(s):  
Ji Woong Kang ◽  
Oh Heon Kwon
Keyword(s):  
Mechanical Response ◽  
Volume Fraction ◽  
High Strength ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Elastic Plastic ◽  
Fiber Arrangement ◽  
Hexagonal Arrangement ◽  
Transportation Applications

The strong continuous fiber reinforced metal matrix composites (MMCs) are recently used in aerospace and transportation applications as an advanced material due to its high strength and light weight. However, MMC is significantly affected by the interface under the transverse loading. Furthermore, the crack at the interface induces weakness of the characteristics of the overall mechanical response and strength of the MMCs. In order to be able to utilize these MMCs effectively and with safety, it must be determined their elastic plastic fracture behaviors at the interface. The influence of different regular fiber arrangement as like square and hexagonal arrangement on the strength of transversely loaded fiber reinforced matrix is analyzed. And the interface of fiber and matrix is modeled as thin multi layers with properties linearly gradient to distinguish the interface from the fiber and matrix. Different fiber arrangement of square and hexagon type is studied. And fiber volume fraction is changed for several kinds (5%-60%).

J Integral of Steel Fiber Reinforced High Strength Concrete

2012 ◽  
Vol 476-478 ◽  
pp. 1568-1571
Author(s):  
Ting Yi Zhang ◽  
Guang He Zheng ◽  
Ping Wang ◽  
Kai Zhang ◽  
Huai Sen Cai
Keyword(s):  
High Strength Concrete ◽  
Fiber Volume Fraction ◽  
Steel Fiber ◽  
Volume Fraction ◽  
High Strength ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Three Point Bending ◽  
Strength Concrete

Through the three-point bending test on the specimens of steel fiber reinforced high strength concrete (SFHSC), the effects of influencing factors including water-cement ratio (W/C) and the fiber volume fraction (ρf) upon the critical value(JC) of J integral were studied. The results show that the variation tendencies of JC are different under different factors. JC meets the linear statistical relation with W/C, ρf, respectively.

scholarly journals Comparisons of thermomechanical fatigue hysteresis loops of fiber-reinforced ceramic-matrix composites subjected to different phase angles

2018 ◽  
Vol 233 (6) ◽  
pp. 2015-2032 ◽  
Author(s):  
Li Longbiao
Keyword(s):  
Volume Fraction ◽  
Frictional Coefficient ◽  
Hysteresis Loops ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Thermomechanical Fatigue ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Phase Angles

In this paper, comparisons of thermomechanical fatigue hysteresis loops of fiber-reinforced ceramic-matrix composites (CMCs) subjected to different phase angles of θ = 0, π/3, π/2, and π have been investigated. The shape, location, and area of fatigue hysteresis loops are affected by the phase angle under the thermomechanical cyclic loading. The effects of fiber volume fraction, fatigue peak stress, matrix crack spacing, interface frictional coefficient, and interface debonded energy on the thermomechanical fatigue hysteresis loops and fiber/matrix interface slip of different phase angles are discussed. The fatigue hysteresis loops of cross-ply CMCs under the phase angles of θ = 0 and π are predicted for different fatigue peak stresses and cycle numbers.

Mechanical Properties of Modified Polypropylene Coarse Fiber-Reinforced, High-Strength, Lightweight Concrete

2011 ◽  
Vol 374-377 ◽  
pp. 1499-1506
Author(s):  
Rong Hui Zhang ◽  
Jian Li
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Lightweight Concrete ◽  
Volume Fraction ◽  
High Strength ◽  
Lightweight Aggregate Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume

In this study, the effect of micro-expansion high strength grouting material (EGM) and Modified polypropylene coarse fiber (M-PP fiber) on the mechanical properties of lightweight concrete are investigated. The influence of EGM and M-PP fiber on compressive strength , flexural strength and drying shrinkage of concrete are researched, and flexural fracture toughness are calculated. Test results show that the effect of EGM and M-PP fiber volume fraction (Vf) on flexural strength and fracture toughness is extremely prominent, compressive strength is only slightly enhanced, and the rate of shrinkage is obviously decreased. It is observed that the shape of the descending branch of load-deflection and the ascending branch of shrinkage-age tends towards gently with the increase of Vf. And M-PP fiber reinforced lightweight aggregate concrete is more economical.

Finite Element Analysis of Interfacial Debonding Damage in Fiber-Reinforced Ceramic Matrix Composites

2007 ◽  
Vol 546-549 ◽  
pp. 1555-1558
Author(s):  
Chun Jun Liu ◽  
Yue Zhang ◽  
Da Hai Zhang ◽  
Zhong Ping Li
Keyword(s):  
Finite Element ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Interfacial Debonding ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Element Analysis

In this paper the composite fracture process has been simulated via the finite element method. A micromechanics model was developed to predict the stress-strain response of a SiO2f/ SiO2 composite explicitly accounting for the local damage mechanisms such as fiber fracture and interfacial debonding. The effects of interfacial strength and fiber volume fraction on the toughness of fiber-reinforced ceramic matrix composites were investigated. The results showed that the composite failure behaviors correlated with the interface strength, which could achieve an optimum value for the elevation of the composite toughness. The increase of fiber volume fraction can make more toughening contributions.

Mechanical Properties of Hybrid Basalt-Polyvinyl Alcohol (PVA) Fiber Reinforced Concrete

2017 ◽  
Vol 744 ◽  
pp. 3-7 ◽  
Author(s):  
Asif Jalal ◽  
Nasir Shafiq ◽  
Ehsan Nikbakht ◽  
Rabinder Kumar ◽  
Muhammad Zahid
Keyword(s):  
Reinforced Concrete ◽  
Volume Fraction ◽  
Peak Load ◽  
High Strength ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Maximum Deflection ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Pva Fiber

This study focuses on the study of the mechanical behavior of non-metallic hybrid Basalt-PVA fiber reinforced concrete. Total five mixes were investigated with one control plain concrete and four with fiber volume fraction of 0.3%, 0.6%, 0.9% and 1.2%. Basalt and PVA were used in same quantity. Fiber decreased workability, therefore superplasticizer was used to maintain workability constant. The increase in superplasticizer and fiber content decreased compression, split tensile and flexure strengths because of formation of big size pores. Whereas fiber enhanced the post peak load zone in the load-deflection curve. Fiber improved the bridging action by increasing energy absorption. Fiber vanished the brittle behavior of high strength concrete and increased first crack toughness, flexure toughness and also maximum deflection. 0.3% volume fraction of fiber was found to be optimum with the negligible decrease in compression, split tensile and flexure strength while caused the considerable increase in first crack toughness, flexure toughness, and maximum deflection.

Effects of Thermal Loading on Fiber-Reinforced Composites With Constituents of Differing Thermal Expansivities

1973 ◽  
Vol 95 (1) ◽  
pp. 55-62 ◽  
Author(s):  
C. A. Hoffman
Keyword(s):  
Thermal Loading ◽  
Volume Fraction ◽  
Fiber Composite ◽  
Large Strain ◽  
Experimental Studies ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Tungsten Fiber ◽  
Elastic Plastic ◽  
Elastic Stresses

Estimates of the magnitudes of elastic stresses and elastic-plastic stresses and strains were made for tungsten fiber-reinforced 80Ni + 20Cr matrix composites; heating or cooling between 80 and 2000 deg F (26.5–1093.5 deg C) was assumed. The calculated elastic stresses exceeded representative or estimated strengths of constituents. For composites with less than 0.65 volume fraction of fiber, plastic flow was considered possible, and elastic-plastic solutions indicated that stresses would be reduced but with the concomitant occurrence of sufficiently large strain ranges, particularly in the matrix, to pose a possible thermal fatigue problem. Limited experimental studies on tungsten fiber-copper matrix composites heated and cooled a number of times between 80 deg F (26.5 deg C) and 1600 deg F (877 deg C) in a conventional furnace and then heated from 80 deg F (26.5 deg C) to 1652 deg F (900 deg C) in a hot stage microscope resulted in matrix microfracture for a 70 volume fraction fiber composite and substantial matrix strain for a 40 volume fraction fiber composite.

The fabrication and properties of short carbon fiber reinforced copper matrix composites

2011 ◽  
Vol 45 (24) ◽  
pp. 2567-2571 ◽  
Author(s):  
Weiwei Li ◽  
Lei Liu ◽  
Bin Shen
Keyword(s):  
Carbon Fiber ◽  
Volume Fraction ◽  
High Strength ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Electroless Copper Plating ◽  
Fiber Volume ◽  
Copper Matrix Composites ◽  
Thermal Expansion Property ◽  
Short Carbon

Short carbon fibers (SCFs) reinforced copper matrix composites, fiber volume fraction of which ranged from 10% to 30%, were prepared by electroless copper plating plus cold press and sintering technique. SCFs were copperized directly by electroless plating using hypophosphite as reducing agent. The effects of SCFs volume fraction on mechanical, thermal, and electrical properties of the composites were discussed. The results indicated that the microhardness and thermal expansion property of Cu/SCFs composites increased with increasing fibers content, owing to the high strength of SCF. However, thermal conductivity and electrical conductivity reversed, it was attributed to the performance of carbon fiber itself; furthermore, more defects and interfaces in the matrix acted as barriers to heat and electronic transfer.

Vibration Damping Behavior of Fiber Reinforced Composites: A Review

2010 ◽  
Vol 425 ◽  
pp. 179-194 ◽  
Author(s):  
Ayman M. Kamal ◽  
Iman M. Taha
Keyword(s):  
Natural Fiber ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
Vibration Damping ◽  
Analytical Models ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Damping Behavior ◽  
Exciting Frequency

This paper gives a wide view over recent research in dynamic characteristics and vibration damping properties of fiber-reinforced, polymer-matrix composites, with emphasis on parameters governing damping, such as fiber volume fraction, fiber orientation, exciting frequency, aspect ratio and fiber-matrix interface, as well as stacking sequence for laminated composites. Both experimental and analytical models are discussed and parameters used to measure the amount of vibration damping are covered. Natural-fiber based composites are handled in detail in the last section of this paper.

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