scholarly journals Mechanical Behavior Modelling and Filler Geometry Effect of Glass Filler Reinforced Starch-Epoxy Hybrid Matrix Composites

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6587
Author(s):  
Lykourgos C. Kontaxis ◽  
Foteini K. Kozaniti ◽  
George C. Papanicolaou
Keyword(s):  
Mechanical Behavior ◽  
Glass Fibers ◽  
Flexural Modulus ◽  
Glass Beads ◽  
Simultaneous Increase ◽  
Matrix Composites ◽  
Static Properties ◽  
Three Point Bending ◽  
Hybrid Matrix ◽  
Experimental Findings

The aim of the present study is to investigate the inclusion geometry and concentration effect on the quasi-static properties of a starch-epoxy hybrid matrix composite. The composites investigated consisted of a starch-epoxy hybrid matrix reinforced with four different glass inclusions such as 3 mm long chopped strands, 0.2 mm long short glass fibers, glass beads (120 μm in diameter) and glass bubbles (65 μm in diameter) at different concentrations. The flexural modulus and the strength of all materials tested were determined using three-point bending tests. The Property Prediction Model (PPM) was applied to predict the experimental findings. The model predicted remarkably well the mechanical behavior of all the materials manufactured and tested. The maximum value of the flexural modulus in the case of the 3 mm long chopped strands was found to be 75% greater than the modulus of the hybrid matrix. Furthermore, adding glass beads in the hybrid matrix led to a simultaneous increase in both the flexural modulus and the strength.

Hardness and flexural performance of 3D orthogonal carbon/glass fibers hybrid composites under thermal-oxidative aging

2021 ◽  
pp. 152808372198927
Author(s):  
Juanzi Li ◽  
Wei Fan ◽  
Tao Liu ◽  
Lili Xue ◽  
Linjia Yuan ◽  
...  
Keyword(s):  
Failure Modes ◽  
Hybrid Composites ◽  
Glass Fibers ◽  
Flexural Modulus ◽  
Three Dimensional ◽  
Accelerated Aging ◽  
Flexural Performance ◽  
Flexural Failure ◽  
The Matrix ◽  
Experimental Findings

This study reports the hardness and flexural performance of the three-dimensional (3 D) orthogonal carbon/glass hybrid fiber/bismaleimide composites subjected to the accelerated aging conditions for 10, 30, 90, 120, and 180 days at 250 °C in an air environment. The rate of reduction in the flexural performance and failure modes were observed, in general, to be related to the aging time. The experimental findings revealed that the significant decline in the flexural performance of the samples aged for less than 30 days was predominantly attributed to the matrix degradation, while for the longer aging durations, the cracks in the composites and decomposition of the residual matrix were responsible for the gradual reduction in the flexural performance. The unaged and 30 days aged samples suffered a brittle failure represented by the macro-cracks and fiber breakage, while the cracked fiber/matrix interface and loosened fiber bundles were the main failure modes for the samples aged for longer times. The changes in the flexural failure modes resulted due to the severe degradation of the matrix under an extreme thermo-oxidative environment. Subsequently, a nonlinear relationship relating the flexural modulus to hardness was proposed.

Tensile and Bending Properties of Jute Fiber Mat Reinforced Unsaturated Polyester Matrix Composites

2011 ◽  
Author(s):  
E. A. Elbadry ◽  
M. S. Aly-Hassan ◽  
H. Hamada
Keyword(s):  
Unsaturated Polyester ◽  
Flexural Modulus ◽  
Jute Fiber ◽  
Matrix Composites ◽  
Neat Resin ◽  
Three Point Bending ◽  
Pull Out ◽  
Weight Content ◽  
Polyester Matrix ◽  
Bending Loading

Jute fiber mat reinforced unsaturated polyester matrix composites having different fiber weight contents (11, 22, 32 wt%) were fabricated by modifying the hand lay-up technique with resin pre-impregnation into the jute mats in the vacuum. Tension and three-point bending tests were carried out to evaluate the effect of fiber contents on these mechanical properties of above-mentioned composites. The results showed that as the fiber weight content increases, tensile strength and modulus increase and the improvement had occurred at 22 wt% of fiber weight content with respect to that of neat resin. As the fiber weight content increases, flexural strength and modulus increase and the improvement had occurred at 11 and 32 wt% fiber contents for the flexural modulus and strength respectively compared to those of neat resin. Fiber pull out mechanism is the failure mode revealed at the fracture surfaces under tensile loading as well as at tension side of composites under bending loading.

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

The Mechanics and Mechanical Behavior of High-Temperature Intermetallic Matrix Composites

2000 ◽  
Author(s):  
Ronald Gibala ◽  
Amit K. Ghosh ◽  
David J. Srolovitz ◽  
John W. Holmes ◽  
Noboru Kikuchi
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites

Correlation of fatigue behavior and dynamic mechanical properties of hybrid composites of polypropylene/short glass fibers/hollow glass beads

2021 ◽  
pp. 089270572199319
Author(s):  
Gustavo B Carvalho
Keyword(s):  
Stress Relaxation ◽  
Flexural Strength ◽  
Relaxation Rate ◽  
Hybrid Composites ◽  
Fatigue Behavior ◽  
Glass Fibers ◽  
Glass Beads ◽  
Hollow Glass ◽  
Dynamic Mechanical ◽  
Short Glass

Ternary hybrid composites of Polypropylene (PP)/Short Glass Fibers (GF)/Hollow Glass Beads (HGB) were prepared using untreated and aminosilane-treated HGB, compatibilized with maleated-PP, and with varying total and relative GF/HGB contents. Static/short-term flexural strength properties data revealed, through lower flexural strength values, that the presence of untreated HGB particles induces to fiber-polymer interfacial decoupling at much higher extent than in the presence of aminosilane-treated HGB particles. This phenomenon is also evident when evaluating the data from displacement-controlled three-point bending fatigue tests. Monitored up to 106 cycles, the analyzed hybrid composites presented distinct performance relative to their fatigue stress relaxation rate: the lower the matrix-reinforcements’ interfacial adhesion, more pronounced the stress relaxation rate as a function of the number of fatigue cycles. Dynamic Mechanical Thermal Analysis (DMTA) results could successfully reveal the hybrid composites behavior at the microstructural level when they were submitted to both static flexural test and fatigue, depending on the degree of interfacial interactions between the polymer matrix of PP and the hybrid reinforcements of GF and HGB (with and without aminosilane surface treatment).

NDE Characterization and Mechanical Behavior in Ceramic Matrix Composites

2006 ◽  
Vol 321-323 ◽  
pp. 946-951 ◽  
Author(s):  
Jeong Guk Kim ◽  
Sung Tae Kwon ◽  
Won Kyung Kim
Keyword(s):  
Mechanical Behavior ◽  
Nondestructive Evaluation ◽  
Tensile Testing ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
In Situ Monitoring ◽  
Matrix Composites ◽  
Ir Camera ◽  
Qualitative Relationship ◽  
Microscopy Characterization

Several nondestructive evaluation (NDE) techniques, including ultrasonic C-scan, X-ray computed tomography (CT), and infrared (IR) thermography, were employed on ceramic matrix composites (CMCs) to illustrate defect information that might effect mechanical behavior and to analyze structural performance of CMCs. Prior to tensile testing, through C-scan and CT analyses results, the qualitative relationship between the relative ultrasonic transmitted amplitude and porosity based on CT was exhibited. An IR camera was used for in-situ monitoring of progressive damages and to determine temperature changes during tensile testing. Moreover, scanning-electron microscopy characterization was used to perform microstructural failure analyses. This paper describes the use of nondestructive evaluation (NDE) techniques to facilitate the understanding of tension behavior of CMCs.

Synthesis and mechanical behavior of nanostructured Al 5083/n-TiB 2 metal matrix composites

2016 ◽  
Vol 656 ◽  
pp. 241-248 ◽  
Author(s):  
Meijuan Li ◽  
Kaka Ma ◽  
Lin Jiang ◽  
Hanry Yang ◽  
Enrique J. Lavernia ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites
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