Effects of geometry on stresses in discontinuous composite materials

1969 ◽  
Vol 4 (2) ◽  
pp. 121-126 ◽  
Author(s):  
M J Iremonger ◽  
W G Wood
Keyword(s):  
Finite Element Method ◽  
Fibre Composite ◽  
Matrix Material ◽  
Fibre Volume ◽  
The Finite Element Method ◽  
Modulus Ratio ◽  
Photoelastic Analysis ◽  
Matrix Modulus ◽  
Discontinuous Composite ◽  
Fibre Matrix

The stresses are examined in a plane unidirectional discontinuous-fibre composite when it is loaded in line with the fibres. A systematic study is presented of the effects of fibre spacing and size and nature of discontinuities. For a fibre/matrix modulus ratio of 5 a total of 18 analyses, obtained by the finite-element method, are discussed. These are for models with fibre-volume fractions of 0·3, 0·5, and 0·67, each with three different distances between fibre ends. Each model is analysed first with the end gap filled with matrix material and then with this space void. Results are confirmed by a photoelastic analysis.

Numerical Analysis for Bearing Performance of Flexible Piles Composite Foundation Influenced by Modulus’ Changes

2011 ◽  
Vol 261-263 ◽  
pp. 1694-1698 ◽  
Author(s):  
Feng Yi Tan ◽  
Xin Zhi Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Frictional Resistance ◽  
Composite Foundation ◽  
Single Pile ◽  
The Finite Element Method ◽  
Modulus Ratio ◽  
The Common ◽  
Flexible Pile

The bearing performance of composite foundation improved by flexible piles was influenced by changes of cushion’s modulus, the modulus ratio between soil on bottom of pile and soil surrounded pile, which was analyzed by the finite element method. Results showed that: 1.For single pile, by increasing of cushion’s modulus, the bearing performance nearby the top of flexible pile increased apparently, and the common tendency of settlement of pile and soil surrounded piles was affected negatively. For multi-piles, the increasing of cushion’s modulus resulted in the increasing of bearing performance and the common tendency of settlement of piles and soil surrounded piles was affected positively. 2.The change of modulus ratio between soil surrounded piles and soil on bottom of piles resulted positively in the change of frictional resistance and end-bearing performance nearby the bottom of single pile and reduced the settlement of composite foundation. But the multi-pile borne absolutely all loading due to the increasing of modulus ratio, and both of piles and soil surrounded piles had the same tendency of settlement.

scholarly journals Interaction between Edge-Crack and Aggregate in Silicate-Based Composite

2017 ◽  
Vol 17 (2) ◽  
pp. 59-64
Author(s):  
Lucie Malíková ◽  
Jan Klusák
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Edge Crack ◽  
Matrix Material ◽  
Interfacial Transition Zone ◽  
Bending Test ◽  
Geometrical Parameters ◽  
The Finite Element Method ◽  
Three Point Bending

Abstract The paper deals with investigation of the interaction between an edge-crack and an aggregate in a silicate-based composite, because adding of aggregates into basic matrix material can improve the fracture mechanical properties of the material significantly. In this work, the three-point-bending test is modelled by means of the finite element method and the dependences of fracture parameters on various material and geometrical parameters of the aggregate and the interfacial transition zone are studied. The results are discussed thoroughly.

Poisson's stresses in fibre composites. I: Analysis

1984 ◽  
Vol 19 (1) ◽  
pp. 43-49 ◽  
Author(s):  
J Ostrowski ◽  
G T Will ◽  
M R Piggott
Keyword(s):  
Finite Element ◽  
Fibre Composite ◽  
Single Fibre ◽  
Fibre Volume ◽  
Matrix Interface ◽  
Fibre Direction ◽  
Element Analysis ◽  
Infinite Array ◽  
Transverse Stresses ◽  
Fibre Matrix

Two methods have been used to evaluate the transverse stresses when an aligned fibre composite is stressed in the fibre direction. A single fibre model is shown to overestimate the stresses at the fibre-matrix interface by about 20 per cent compared with a finite element solution for an infinite array of fibres. Using relatively few fibres in the finite element analysis, however, only gives very approximate stress distributions. With fibre volume fractions in the range 0-0.50 the average radial stresses across the fibre-matrix interface are always compressive, and can be represented by a relatively simple formula with an accuracy which is normally with in a few percent of the finite element value.

Plastic flow and failure of discontinuous-fibre composite materials

1970 ◽  
Vol 5 (3) ◽  
pp. 212-222 ◽  
Author(s):  
M J Iremonger ◽  
W G Wood
Keyword(s):  
Finite Element ◽  
Fibre Composite ◽  
Matrix Material ◽  
Element Model ◽  
The Finite Element Method ◽  
Composite Failure ◽  
Theoretical Predictions ◽  
Plastic Matrix ◽  
The Finite Element Model ◽  
Fibre Composite Material

The stress distribution in a plane discontinuous-fibre composite material having elastic fibres and an elastic-plastic matrix material is obtained for both non-interacting and interacting discontinuities and different degrees of work-hardening. The theoretical predictions, obtained by the finite-element method, are compared with the strain distribution in a model of steel and lead-alloy by the surface-coating photoelastic technique. Composite failure is simulated in the finite-element model and predictions compared with the observations of composite failure made by other workers.

Effects of a Frictional Interface on the Load Diffusion from a Broken Filament in a Fibrous Composite

1989 ◽  
Vol 170 ◽  
Author(s):  
Bulent Aksel ◽  
Dimitris C. Lagoudas ◽  
Chung-Yuen Hui
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fibrous Composite ◽  
Matrix Material ◽  
Slip Zone ◽  
Shear Stresses ◽  
Shear Lag ◽  
The Finite Element Method ◽  
Frictional Interface ◽  
Element Method

AbstractThe effects of a frictional interface on the load diffusion from a broken fiber to the surrounding matrix material and the extent of debonding near the fiber break in a single-fiber reinforced composite of infinite extent are studied by using the finite element method. The normal and shear stresses on the interface, the extent of the slip zone and the axial load of the fiber are evaluated for different frictional coefficients and material parameters for both the fiber and the matrix. A shear-lag analysis is also carried out to obtain a closed form approximate solution of the fiber load diffusion problem. The extent of the slip zone and the stresses predicted by the shear-lag model are compared with the finite element method results.

scholarly journals Stress analysis of sandwich composite beam induced by piezoelectric layer

2018 ◽  
Vol 16 (1_suppl) ◽  
pp. 132-139
Author(s):  
Shiuh-Chuan Her ◽  
Han-Yung Chen
Keyword(s):  
Finite Element Method ◽  
Young’S Modulus ◽  
Composite Structure ◽  
Piezoelectric Layer ◽  
Composite Beam ◽  
Young's Modulus ◽  
Sandwich Composite ◽  
The Finite Element Method ◽  
Modulus Ratio ◽  
Sandwich Composite Structure

Introduction: Smart structures equipped with piezoelectric devices to sense and actuate the structure could be used in many engineering applications. To explore the smart structure further and apply it to more complex structures, some problems are critical to be concerned. Among them, delamination due to the high stress is an important issue since its serious effect on the strength and stiffness of the composite structure. Method: In this investigation, a piezoelectric layer is embedded into the host structure to form a sandwich composite structure. The piezoelectric layer is subjected to an electric voltage, yielding the bending effect on the sandwich composite structure. A theoretical model based on the Euler beam theory and interfacial continuity is presented to determine the stresses of the sandwich composite beam caused by the piezoelectric layer. Results: The influences of the embedded depth and Young’s modulus of the piezoelectric layer on the stress distribution of the sandwich composite beam are investigated through a parametric study. The analytical solutions are verified by the finite element method. Good agreement is achieved between the present approach and the finite element method. Conclusions: Numerical analysis indicates that the maximum tensile stresses in the top and bottom layers are decreasing with the increase of the embedded depth, while the maximum compressive stress in the lead zirconate titanate layer is increasing with the increase of the embedded depth. Both the top and bottom layers are subjected to tensile stress and increasing with the increase of the Young’s modulus ratio, while the piezoelectric layer is subjected to compressive stress and increasing with the increase of the Young’s modulus ratio.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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