Process dependence of pressure-specific volume-temperature measurement for amorphous polymer: Acrylonitrile-butadiene-styrene

2020 ◽  
Vol 81 ◽  
pp. 106232 ◽  
Author(s):  
Jian Wang ◽  
Christian Hopmann ◽  
Mauritius Schmitz ◽  
Tobias Hohlweck
Keyword(s):  
Temperature Measurement ◽  
Specific Volume ◽  
Amorphous Polymer ◽  
Acrylonitrile Butadiene Styrene ◽  
Butadiene Styrene

The Experimental Prediction of the Lifetime of Acrylonitrile Butadiene Styrene (ABS) by the Energetic Method

2019 ◽  
Vol 820 ◽  
pp. 147-158
Author(s):  
Abderrazak En-Naji ◽  
Nadia Mouhib ◽  
Fatima Majid ◽  
Hicham ElKihal ◽  
Mohamed El Ghorba
Keyword(s):  
Amorphous Polymer ◽  
Energy Parameter ◽  
Acrylonitrile Butadiene Styrene ◽  
Tensile Tests ◽  
Experimental Models ◽  
Uniaxial Tensile ◽  
Unified Theory ◽  
Theoretical Evaluation ◽  
Life Fraction ◽  
Butadiene Styrene

In this paper, we are dealing with the study of the mechanical behavior of an amorphous polymer, acrylonitrile butadiene styrene "ABS". In fact, uniaxial tensile tests on rectangular specimens containing a combined defect, with simple and double notches, has been done. The proposed approach develop a method, based on energy parameter, to calculate the evolution of damage over the materials’ life. This method can be used to predict quantitatively the risk of sudden rupture in a structure. Therefore, the damage evaluation based on the residual energy method was compared to the unified theory one for different loading levels. The prediction of damage by experimental models has led to the determination of the three stages of damage evolution, which are the initiation, propagation and complete deterioration of the material. Thus, the concept of reliability is used to specify the critical life fraction, which is similar to the notch depth (βc) of a modeled defect as a combined defect on an ABS sample. In addition, the unified theory was used in this work, to define on the one hand, the parameter of damage which is the internal variable which describes the failure level of the structure in function of life fraction, on the other hand, for the theoretical evaluation of the level of damage. Finally, we have proved that the theoretical and experimental results show a good agreement.

scholarly journals Continuous Two-Domain Equations of State for the Description of the Pressure-Specific Volume-Temperature Behavior of Polymers

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 409 ◽  
Author(s):  
Jian Wang ◽  
Christian Hopmann ◽  
Malte Röbig ◽  
Tobias Hohlweck ◽  
Cemi Kahve ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Specific Volume ◽  
Equations Of State ◽  
Amorphous Polymer ◽  
Glassy State ◽  
Acrylonitrile Butadiene Styrene ◽  
Crystalline Polymer ◽  
Polymer Processing ◽  
Pvt Behavior ◽  
Fitting Accuracy

The two-domain Schmidt equation of state (EoS), which describes the pressure-specific volume–temperature (pvT) behavior of polymers in both the equilibrium molten/liquid state and non-equilibrium solid/glassy state, is often used in the simulation of polymer processing. However, this empirical model has a discontinuity problem and low fitting accuracy. This work derived a continuous two-domain pvT model with higher fitting accuracy compared with the Schmidt model. The cooling rate as an obvious influencing factor on the pvT behavior of polymers was also considered in the model. The interaction parameters of the equations were fitted with the experimental pvT data of an amorphous polymer, acrylonitrile-butadiene-styrene (ABS), and a semi-crystalline polymer, polypropylene (PP). The fitted results by the continuous two-domain EoS were in good agreement with the experimental data. The average absolute percentage deviations were 0.1% and 0.16% for the amorphous and semi-crystalline polymers, respectively. As a result, the present work provided a simple and useful model for the prediction of the specific volume of polymers as a function of temperature, pressure, and cooling rate.

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