Estimation of stressed-deformed state of polymer composite material with hybrid matrix

Properties of polymer composite material consisting of carbon fabric and two matrix types (epoxy and organic-silicon) have been studied. The main purpose of the organic-silicon matrix is to relax stresses arising in carbon-filled plastic components under loads and to decelerate (or stop) crack growth. The structure of the composite material was determined by using a tomography. On the basis of the structure, a finite-element model was developed and a calculation of the stressed-deformed state depending on elastic characteristics of the matrix was performed. A safety factor calculation was made. It was found out that the addition of organic-silicon material in the composite composition made possible to decrease stress values in the crack tip that considerably increased the service life of such materials.

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Identification of Fatigue Damage Stages in Polymer Composite Materials by using Acoustic Emission: Approach and Perspectives

10.20944/preprints202112.0214.v1 ◽

2021 ◽

Author(s):

Oleg Bashkov ◽

Anton Bryansky ◽

Timofey Efimov ◽

Roman Romashko

Keyword(s):

Acoustic Emission ◽

Composite Material ◽

Polymer Composite ◽

Fatigue Loading ◽

Polymer Composite Material ◽

Self Organizing Map ◽

Local Formation ◽

Adhesion Failure ◽

The Matrix ◽

Ae Signals

The work is devoted to the study of the mechanisms of damage accumulation in a polymer composite material (PCM) during fatigue loading. Mechanical testing of a fiberglass sample was carried out by cyclic tension accompanied by registration of acoustic emission (AE). For the recorded AE signals, the Fourier spectra were calculated and used for clustering with Kohonen self-organizing map. Relations between clusters and types of damage in the PCM structure were established. The analysis of the peak frequencies of the Daubechies D14-wavelet components of AE signals was carried out. Obtained results has allows one to describe the processes of destruction in the PCM sample. It has been established that, on the base of local formation of microdamages in the matrix and the fracture of the fibers detected during recording of the AE data, it is possible to predict the destruction of the polymer composite material, while the beginning of a material destruction can be registered if the damage identified as an adhesion failure is observed. Perspectives of application of adaptive fiber-optic AE sensors for structural monitoring of PCMs on the base of preliminary experimental results are considered and discussed.

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DETERMINATION OF THE POLYMERIZATION DEGREE OF THE MATRIX OF POLYMER COMPOSITE MATERIAL USING ULTRASONIC METHOD

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2019-85-4-33-39 ◽

2019 ◽

Vol 85 (4) ◽

pp. 33-39

Author(s):

Victor V. Murashov ◽

Valery M. Aleksashin ◽

Konstantin S. Mishurov

Keyword(s):

Composite Material ◽

Kinetic Parameters ◽

Polymer Composite ◽

Ultrasonic Method ◽

Acoustic Method ◽

Degree Of Polymerization ◽

Polymer Composite Material ◽

Ultrasonic Vibrations ◽

The Matrix

The results of studying the efficiency of the laser-acoustic method of ultrasonic testing in determination of the degree of polymerization of the matrix of polymer composite material (PCM) are presented. We have studied the PCM samples used for manufacturing integrated structures. It is shown that excessive degree of polymerization of the preformed blanks leads to a decrease in the strength of connection of the structural elements and precludes obtaining the desired shape and geometric dimensions of the product. We developed fundamentally new diagnostic parameters, which are characterized by high reliability and accuracy of determination. To forecast sample curing regimes with given values of the degree of transformation, the reaction kinetics was analyzed using differential scanning calorimetry Experimental results used for calculation of the kinetic parameters were obtained on a thermoanalytical complex DSC 1 (Switzerland). The kinetic parameters of polymerization and degree of binder curing in plastics were determined by the thermal effect of the reaction. It is shown that when determining the degree of polymerization of a PCM matrix by an ultrasonic method (laser-acoustic method of exciting ultrasonic vibrations), the product of attenuation of the bottom signal of longitudinal ultrasonic vibrations by the signal round-trip time and energy of the structural noise (thus taking into account the porosity of the material), can be used as reliable parameters of diagnostics. The proposed method provides higher accuracy compared to other methods used for control of the degree of polymerization.

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Reliability evaluation based on modal parameters of carbon-nanotube-reinforced-polymer-composite material using multiscale finite element model

Physica E Low-dimensional Systems and Nanostructures ◽

10.1016/j.physe.2020.114318 ◽

2021 ◽

Vol 125 ◽

pp. 114318

Author(s):

Jorge Alberto Palacios ◽

Rajamohan Ganesan

Keyword(s):

Finite Element ◽

Composite Material ◽

Carbon Nanotube ◽

Finite Element Model ◽

Polymer Composite ◽

Element Model ◽

Polymer Composite Material ◽

Modal Parameters ◽

Reinforced Polymer ◽

Multiscale Finite Element

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New Composite Materials With a “Liquid” Matrix

MATEC Web of Conferences ◽

10.1051/matecconf/202134602009 ◽

2021 ◽

Vol 346 ◽

pp. 02009

Author(s):

Ekaterina Kosenko ◽

Vladimir Nelyub

Keyword(s):

Composite Material ◽

Crack Growth ◽

Strain State ◽

Element Model ◽

Polymer Composite Material ◽

Dynamic Loads ◽

Liquid Matrix ◽

Elastomeric Matrix ◽

Thermosetting Epoxy ◽

Elastic Characteristics

A new polymer composite material composed of a fibre reinforced filler and two types of matrices: thermosetting (epoxy) and elastomeric (organosilicon) is introduced. The main purpose of the elastomeric matrix is stress relaxation and slowdown and prevention of crack growth in the composite material under dynamic loads, including bending and delamination. In this study, a finite element model of such composite is developed and its stress-strain state is calculated depending on the elastic characteristics of the elastomer. It was established that the addition of an elastomeric matrix in the composite allows to stop the crack growth, and significantly increase the durability of such materials.

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Formation of mechanical properties of polymer composite materials with different types of hybrid matrices

Technology of metals ◽

10.31044/1684-2499-2021-0-10-28-34 ◽

2021 ◽

pp. 28-34

Author(s):

E. A. Kosenko ◽

◽

P. E. Demin ◽

Keyword(s):

Mechanical Properties ◽

Composite Material ◽

Composite Materials ◽

Polymer Composite ◽

Strength Properties ◽

Polymer Composite Material ◽

Polymer Materials ◽

Polymer Composite Materials ◽

Hybrid Matrix ◽

The Matrix

The mechanical properties of polymer composite materials largely depend on the interfacial phenomena occurring on the interface between the matrix and reinforcing material. The addition of components to the matrix of polymer composite materials that retain their viscoelastic state during the molding process of the products makes possible to locally change the deformation-and-strength properties of a finished product, adapting it to the specified operating conditions. The viscoelastic components in the hybrid matrix form the third phase of the polymer composite material. Increasing the efficiency of interfacial layers of polymer composite materials with various types of hybrid matrices is the most important task of their development. The samples for microanalysis of the polymer composite material structure with various types of hybrid matrices were molded using the prepreg technology by vacuum molding on the basis of BT400 biaxial basalt fabric. Technical wax, anaerobic (Loctite 638) and organosilicon (Yunisil-9628) polymer materials were selected as the viscoelastic components of the hybrid matrix. In order to explain the reasons for the change in the deformation-and-strength properties of the obtained basalt plastics with various viscoelastic components in the composition of the hybrid matrix, microanalysis of their structure was carried out. A mechanism for choosing a scheme for the location of viscoelastic components in a matrix of polymer composite materials based on the provisions of combinatorial optimization is described.

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