Begell House Inc.
Composites: Mechanics, Computations, Applications: An International Journal
CMCA
2152-2057
9
2
2018
HIGH-ENERGY BALL MILLING OF Al–Cu–Fe QUASICRYSTAL-REINFORCED COMPOSITE POWDERS BASED ON POLYPHENYLENE SULFIDE
95-117
10.1615/CompMechComputApplIntJ.v9.i2.10
Dilyus I.
Chukov
National University of Science and Technology MISiS, 4 Leninsky Ave., Moscow,
119049 Russia
A. A.
Stepashkin
National University of Science and Technology MISiS, 4 Leninsky Ave., Moscow,
119049 Russia
L. K.
Olifirov
National University of Science and Technology MISiS, 4 Leninsky Ave., Moscow,
119049 Russia
Victor V.
Tcherdyntsev
National University of Science and Technology MISIS , 119049, 4 Leninskii Ave., Moscow, Russia
S. D.
Kaloshkin
National University of Science and Technology MISiS, 4 Leninsky Ave., Moscow,
119049 Russia
ball milling
polyphenylene sulfide
quasicrystals
composites
The process of formation of composite powders based on polyphenylene sulfide reinforced with i-Al–Cu–Fe quasicrystals was investigated. High-energy ball milling in a planetary ball mill was applied to produce composites from an initial mixture of polymer and quasicrystalline powders.
The influence of ball milling regimes on the structure of both pure polyphenylene sulfide and composite powders was investigated. It was found that using more intense regimes of ball milling leads to a noticeable increase in the size of polymer powder particles because of the agglomeration occurring in milling. Differential scanning calorimetry and X-ray analysis show the results of milling in partial amorphization of polyphenylene sulfide. It was observed that ball milling for 30 min at a carrier rotation rate of 200 rpm is an optimal regime, which, on the one hand, allows one to reach homogeneous filler distribution in the polymer matrix, and, on the other hand, to keep the initial
structural and morphological characteristics of the initial polymer.
TENSION–COMPRESSION ASYMMETRY AND ELASTIC STRAIN INCORPORATED INTO THE SOLUTION OF THE PROBLEM OF MARTENSITIC NONELASTICITY AND DIRECT MARTENSITIC TRANSITION IN BEAMS FROM A SHAPE MEMORY ALLOY UNDERGOING BENDING
119-139
10.1615/CompMechComputApplIntJ.v9.i2.20
Pavel A.
Safronov
Moscow Aviation Institute (National Research University), 4 Volokolamskoe Highway, Moscow, 125933, Russia
shape memory alloys
tension–compression asymmetry
elastic strain
phase transitions
structure transitions
beams
bend
In this paper, the problems of cantilever and pure bending of a beam of solid rectangular cross section from a shape memory alloy (SMA) in direct thermoelastic phase end structure transitions are solved. This paper presents database on nonlinear model of SMA straining in phase and structure transitions. In this paper, the propositions of the proportional loading of active processes and of
the Bernoulli–Euler hypothesis on a bending problem are accepted. The elastic part of full strain and tension–compression asymmetry of the SMA stress–strain curves is incorporated. A numerical solution of the problem in noncoupled formulation is obtained by a semi-inverse method,. Diagrams of dimensionless neutral surface coordinate and dimensionless beam curving from dimensionless
bending moment are shown. In the case of direct transition effect, linear response of martensite volume fraction on dimensionless beam curving and dependence of dimensionless normal axial stress on martensite volume fraction are obtained. Impact tension–compression asymmetry of SMA on the dependence of dimensionless beam flexure on dimensionless axial coordinate in the case of cantilever bending is shown. In the case of martensite nonelasticity effect and in the region of small values of dimensionless bending moment, the dimensionless neutral surface coordinate depends only on the ratio of tension and compression elastic moduli of SMA. Similar results are obtained in the case of direct transition effect and in the region of small values of dimensionless martensite volume fraction.
IMPACT TOUGHNESS OF NANOCOMPOSITE MATERIALS FILLED WITH FULLERENE C60 PARTICLES
141-161
10.1615/CompMechComputApplIntJ.v9.i2.30
A. V.
Buketov
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
А. А.
Sapronov
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
N. N.
Buketova
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
Mykola V.
Brailo
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
P. О.
Maruschak
Ternopil Ivan Puluj National Technical University, 56 Ruska Str., Ternopil,
46001, Ukraine
S. V.
Panin
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia; National Research Tomsk Polytechnic University, 2A Lenin Ave., Bld. 11,
Tomsk, 634028, Russia
M. Yu.
Amelin
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
fullerene C60
epoxy composite
IR-spectral analysis
impact toughness
optical microscopy
scanning electron microscopy
fracture
crack propagation
coating
deck machinery
vessel shafting
The dynamics of fracture of epoxy composites on various loadings of fullerene C60 particles was investigated. Epoxy diane oligomer ED-20 was employed as the basic bonding agent in composite formation. It is characterized by its ability of providing high adhesion and cohesive strengths, easy processibility, as well as low coating shrinkage on deposition onto long-length surfaces of complex profile parts. Polyethylene polyamine (PEPA) was used for cross-linking of the epoxy composites, which made it possible to carry out the curing process at room temperature. With the use of IR spectral analysis, the nucleation of new links at the polymer–filler interface was determined, which was implied to result from the improved
chemical activity of the dispersed particle surface. It is confirmed by the shift of the absorption bands as well as by the increase in the transmission rate intensity, half-width, and in the relative area of absorption bands. The loading of nanoparticles into the epoxy binder at the optimal content of q = 0.025 parts by weight (pts.wt.) allows one to improve the impact toughness by 2.5 times in contrast with the neat epoxy matrix. With the use of an RKP-300 impact pendulum machine for high-rate bending, the characteristic
fracture stages of epoxy nanocomposites were revealed in regard to: i) crack initiation, ii) crack growth, and iii) the fracture point. The use of the VUHI-CHARPY data processing software made it possible to determine the components of fracture energy of the corresponding failure stages. The fracture surface of the nanocomposite materials was investigated with the use of optical and scanning electron microscopy (SEM). By the analysis of SEM micrographs of the fracture surface the homogeneous
topology at the nanoscale formed through the action of the particles as a stopper system was revealed.
The latter provides the retardation of microcrack propagation processes in the material bulk.
REPROCESSING OF COMPOSITES BASED ON POLYPROPYLENE LOADED WITH OLIVE HUSK FLOUR
163-187
10.1615/CompMechComputApplIntJ.2018024680
Salem
Krim
Laboratoire des Matériaux Polymères Avancés, Département de Génie des Procédés, Université Abderrahmane MIRA, Route de Targa-Ouzemmour,
Béjaïa 06000, Algérie
Amar
Boukerrou
Department of Process Engineering, Faculty of Technology, Laboratory
of Advanced Polymer Materials (LMPA), Abderrahmane MIRA University,
Béjaïa 06000, Algeria
Hocine
Djidjelli
Department of Process Engineering, Faculty of Technology, Laboratory
of Advanced Polymer Materials (LMPA), Abderrahmane MIRA University,
Béjaïa 06000, Algeria
Johnny
Beaugrand
INRA (French National Institute for Agricultural Research) UMR FARE 614
Fractionation of Agricultural Resources and Environment, 2 Esplanade Roland
Garros, 51686 Reims cedex 2, France
Dalila
Hammiche
Laboratoire des Matériaux Polymères Avancés, Département de Génie
des Procédés, Université Abderrahmane MIRA, Route de Targa-Ouzemmour,
Béjaïa 06000, Algérie
composites
polymers
natural fibers
recycling
interface
The growing interest in the preservation of our environment stimulates solutions for developing less impacting materials. Thus, the development of composites from renewable resources and recyclable end-of-life resources seems an interesting alternative. This motivated the reason to focus our work on the use of agricultural by-products and waste recycling. Our purpose is the reprocessing
of composites based on polypropylene (PP) reinforced with olive husk flour (OHF) at various load rates with adding PP-g-MA as a compatibilizer by six cycles of extrusion. The Young modulus of the composites has slightly increased with the rise of the OHF rate and the number of cycles. An
FTIR analysis shows two types of degradation after reprocessing: thermal degradation characterized by a splitting of chains and thermal oxidation justified by the increase in the carbonyl index even when the intensity of the absorption peak has been noticed at 1690–1640 cm–1 referring to the vinyl groups after the 6th cycle. Moreover, the TGA analysis showed a better thermal stability of the composites after the 6th cycle compared to the virgin PP. The rate of crystallization increases with the number of extrusion cycle.