scholarly journals Materials Informatics Approach to Predictive Models for Elastic Modulus of Polypropylene Composites Reinforced by Fillers and Additives

2021 ◽  
Vol 7 (0) ◽  
pp. n/a
Author(s):  
Yuko IKEDA ◽  
Michihiro OKUYAMA ◽  
Yukihito NAKAZAWA ◽  
Tomohiro OSHIYAMA ◽  
Kimito FUNATSU
Keyword(s):  
Elastic Modulus ◽  
Predictive Models ◽  
Materials Informatics ◽  
Polypropylene Composites

scholarly journals Foams with Enhanced Ductility and Impact Behavior Based on Polypropylene Composites

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 943 ◽  
Author(s):  
Santiago Muñoz-Pascual ◽  
Cristina Saiz-Arroyo ◽  
Zina Vuluga ◽  
Mihai Cosmin Corobea ◽  
Miguel Angel Rodriguez-Perez
Keyword(s):  
Elastic Modulus ◽  
Cellular Structure ◽  
Glass Fibers ◽  
Halloysite Nanotubes ◽  
Impact Behavior ◽  
Impact Performance ◽  
Polypropylene Composites ◽  
Branched Polypropylene ◽  
Long Chain ◽  
Long Chain Branched Polypropylene

In this work, formulations based on composites of a linear polypropylene (L-PP), a long-chain branched polypropylene (LCB-PP), a polypropylene–graft–maleic anhydride (PP-MA), a styrene-ethylene-butylene-styrene copolymer (SEBS), glass fibers (GF), and halloysite nanotubes (HNT-QM) have been foamed by using the improved compression molding route (ICM), obtaining relative densities of about 0.62. The combination of the inclusion of elastomer and rigid phases with the use of the LCB-PP led to foams with a better cellular structure, an improved ductility, and considerable values of the elastic modulus. Consequently, the produced foams presented simultaneously an excellent impact performance and a high stiffness with respect to their corresponding solid counterparts.

Effect of carbon fiber amount and length on flame retardant and mechanical properties of intumescent polypropylene composites

2017 ◽  
Vol 52 (4) ◽  
pp. 519-530 ◽  
Author(s):  
Lemiye Atabek Savas ◽  
Aysenur Mutlu ◽  
Ali Sinan Dike ◽  
Umit Tayfun ◽  
Mehmet Dogan
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Carbon Fiber ◽  
Flame Retardant ◽  
Oxygen Index ◽  
Mechanical Test ◽  
Mechanical Analysis ◽  
Limiting Oxygen Index ◽  
Polypropylene Composites ◽  
Index Value

The effects of carbon fiber amount and length were studied on the flame retardant, thermal, and mechanical properties of the intumescent polypropylene composites. The flame retardant properties of the intumescent polypropylene-based composites were investigated using limiting oxygen index, vertical burning test (UL-94), and mass loss calorimeter. The mechanical properties of the composites were studied using tensile test and dynamic mechanical analysis. According to the flammability tests results, the antagonistic interaction was observed between carbon fiber and ammonium polyphosphate. The limiting oxygen index value reduced steadily as the added amount of carbon fiber increased. Mechanical test results revealed that the addition of carbon fiber increased the tensile strength and the elastic modulus as the added amount increased. No effect of carbon fiber length was observed on the flammability, fire performance, and tensile properties of composites, whereas the elastic modulus increased as the carbon fiber initial length increased.

scholarly journals Comparison Between Biphasic and Triphasic Model for Predicting the Elastic Modulus of Concrete

2018 ◽  
Vol 203 ◽  
pp. 06003
Author(s):  
Fatima Aouissi ◽  
Chung-Chia Yang ◽  
Abdelamalek Brahma ◽  
Omar Zorkane
Keyword(s):  
Composite Material ◽  
Elastic Modulus ◽  
Transition Zone ◽  
Predictive Models ◽  
Complex Structures ◽  
Biphasic Model ◽  
Interface Transition Zone ◽  
The Matrix ◽  
Combined Models ◽  
Voigt Model

The concrete is a composite material which, on the scale of the microstructure, can be considered as consisting of three phases: the matrix, the inclusions and the interface transition zone. The latter has features that reduce the properties of concrete and therefore limits its performance. Thus, with such complex structures, this zone is the weakest zone of the composite. The evaluation of the effective behavior of composite using predictive models requires a consideration of this zone. In this context an approach based on the model of double inclusion and on the Mori Tanaka theory to predict the elastic modulus of concrete are used. This approach will be compared with some analytical biphasic model such as Reuss model, Voigt model, the Voigt and Reus combined models and Hashin and Shtrikman (HδS) models. Many experimental results are considered in the confrontation. So the model developed predicts very satisfactorily the elastic modulus of the concrete unlike other models in which a discrepancy in the results is demonstrated in the majority of cases.

scholarly journals Polypropylene composites filled with glass microspheres and basalt fiber

2020 ◽  
pp. 72-76
Author(s):  
Nguen Kong Tinh ◽  
N. M. Chalaya ◽  
V. S. Osipchik
Keyword(s):  
Elastic Modulus ◽  
Impact Strength ◽  
Basalt Fiber ◽  
Tensile Yield Strength ◽  
Technological Properties ◽  
Basalt Fibers ◽  
Glass Microspheres ◽  
Polypropylene Composites ◽  
Melt Index ◽  
The Impact

The physicomechanical and technological properties of polypropylene-based composites filled with basalt fibers (BF) and glass microspheres (GM) are studied. It is shown that the introduction of short BFs and glass microspheres into PPs while ensuring good “fiber-matrix” adhesion by adding maleic anhydride-grafted polypropylene (MAPP) leads to a significant increase in the elastic modulus and tensile yield strength. The impact strength of composites improves with increasing fiber content in the presence of GM. The melt index and thermomechanical stability of the developed composites increase.

Water Absorption and Tensile Strength of Coconut Filter Fibers/Polypropylene Composites

2013 ◽  
Vol 702 ◽  
pp. 207-212 ◽  
Author(s):  
N.P.G. Suardana ◽  
I. Putu Lokantara ◽  
Y.J. Piao ◽  
J.K. Lim
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Water Absorption ◽  
Immersion Time ◽  
Room Temperature ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Polypropylene Composites ◽  
Untreated Fiber ◽  
Treated Fiber

In this study, we evaluated water absorption and tensile properties of coconut filter fiber reinforced polypropylene composites. The fibers were subjected to various immersion times for 0.5, 1, and 3 h in 0.5 % acrylic acid solution at room temperature and 0.5 h at 70 oC. The treated fibers were used as reinforcement of polypropylene composites. Water absorption of treated fiber composites was lower than those of untreated fiber composite. Boiling in water significantly affect water absorption rate of the composites. The tensile strength and elastic modulus of treated fiber are higher than untreated fiber. They show a decrease in tendency when the immersion time increased. Tensile strength and elastic modulus of composites with AA-treated at 70 oC fiber are the highest.

Effect Of Elevated Temperatures On Complete Concrete Deformation Diagrams

2019 ◽  
pp. 9-14
Keyword(s):  
Experimental Data ◽  
Elastic Modulus ◽  
Elevated Temperatures ◽  
Peak Load ◽  
Relative Deformation ◽  
Deformation Characteristics ◽  
Compression Tests ◽  
Strain Behavior ◽  
Different Temperatures ◽  
Deformation Diagrams

The analysis of the previous results of the study on concrete stress-strain behavior at elevated temperatures has been carried out. Based on the analysis, the main reasons for strength retrogression and elastic modulus reduction of concrete have been identified. Despite a significant amount of research in this area, there is a large spread in experimental data received, both as a result of compression and tension. In addition, the deformation characteristics of concrete are insufficiently studied: the coefficient of transverse deformation, the limiting relative compression deformation corresponding to the peak load and the almost complete absence of studies of complete deformation diagrams at elevated temperatures. The two testing chambers provided creating the necessary temperature conditions for conducting studies under bending compression and tension have been developed. On the basis of the obtained experimental data of physical and mechanical characteristics of concrete at different temperatures under conditions of axial compression and tensile bending, conclusions about the nature of changes in strength and deformation characteristics have been drawn. Compression tests conducted following the method of concrete deformation complete curves provided obtaining diagrams not only at normal temperature, but also at elevated temperature. Based on the experimental results, dependences of changes in prism strength and elastic modulus as well as an equation for determining the relative deformation and stresses at elevated temperatures at all stages of concrete deterioration have been suggested.

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