scholarly journals Electrical resistance variation during tensile and self-heating tests conducted on thermoplastic polymer-matrix composites

2019 ◽  
Vol 224 ◽  
pp. 111001 ◽  
Author(s):  
W. Harizi ◽  
R. Azzouz ◽  
A.T. Martins ◽  
K. Hamdi ◽  
Z. Aboura ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Electrical Resistance ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
Thermoplastic Polymer ◽  
Self Heating ◽  
Resistance Variation ◽  
Electrical Resistance Variation

scholarly journals Mechanical Properties of Some Epoxy-PMMA Blends

2021 ◽  
Vol 58 (2) ◽  
pp. 220-228
Author(s):  
Georgel Mihu ◽  
Sebastian-Marian Draghici ◽  
Vasile Bria ◽  
Adrian Circiumaru ◽  
Iulian-Gabriel Birsan
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
Thermoplastic Polymer ◽  
Special Equipment ◽  
Effect Of Solvents ◽  
Thermoplastic Blends ◽  
Thermoset Polymer ◽  
Temperature And Pressure ◽  
Pmma Blends

The thermoset polymers and the thermoplastic polymers matrix composites require different forming techniques due to the different properties of two classes of polymers. While the forming technique for thermoset polymer matrix composites does not require the use of special equipment, the thermoplastic polymer matrix composites imposes the rigorous control of temperature and pressure values. Each type of polymer transfers to the composite a set of properties that may be required for a certain application. It is difficult to design a composite with commonly brittle thermoset polymer matrix showing properties of a viscoelastic thermoplastic polymer matrix composite. One solution may consist in mixing a thermoset and a thermoplastic polymer getting a polymer blend that can be used as matrix to form a composite. This study is about using PMMA solutions to obtain thermoset-thermoplastic blends and to mechanically characterize the obtained materials. Three well known organic solvents were used to obtain the PMMA solutions, based on a previous study concerning with the effect of solvents presence into the epoxy structure.

scholarly journals Criticality of the Self-Heating Effect in Polymers and Polymer Matrix Composites during Fatigue, and Their Application in Non-Destructive Testing

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 19 ◽  
Author(s):  
Andrzej Katunin
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
The Self ◽  
Matrix Composites ◽  
Heating Effect ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Structural Degradation ◽  
Self Heating ◽  
Non Destructive

The self-heating effect is a dangerous phenomenon that occurs in polymers and polymer matrix composites during their cyclic loading, and may significantly influence structural degradation and durability as a consequence. Therefore, an analysis of its criticality is highly demanding, due to the wide occurrence of this effect, both in laboratory fatigue tests, as well as in engineering practice. In order to overcome the problem of the accelerated degradation of polymer matrix structures, it is essential to evaluate the characteristic temperature values of self-heating, which are critical from the point of view of the fatigue life of these structures, i.e., the temperature at which damage initiates, and the safe temperature range in which these structures can be safely maintained. The experimental studies performed were focused on the determination of the critical self-heating temperature, using various approaches and measurement techniques. This paper present an overview of the research studies performed in the field of structural degradation, due to self-heating, and summarizes the studies performed on the evaluation of the criticality of the self-heating effect. Moreover, the non-destructive testing method, which uses the self-heating effect as a thermal excitation source, is discussed, and the non-destructivity of this method is confirmed by experimental results.

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