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Creep Behaviour of High-Density Polyethylene (HDPE)
Patzelt, Petr ; Přikryl, Zdeněk (referee) ; Petrůj, Jaroslav (advisor)
The theoretical part of the thesis deals with the summary of material properties and testing parameters that influence SCG process. The experimental part is aimed on the comparison of different condition effects on the process of FNCT and PENT. Chosen temperatures for PENT were 70; 80 and 90 °C and the applied nominal stress 2,0; 2,4 and 2,8 MPa. In the case of FNCT the chosen temperatures were the same and the ligamental stress was 4 MPa for all used environments which were: water, Arkopal N110 solution and Dehyton PL solution. In addition, several experiments were measuered under applied nominal stresses 3; 4; 5; 6; 8 a 10 MPa and at 80 °C in Arkopal N110 solution. The morphology of crack surfaces was studied afterwards. The obtained data were used for evaluaion by a five parameter equation.
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Study of conditions influence on the rate of crack propagation in HDPE
Patzelt, Petr ; Kučera, Jaroslav (referee) ; Petrůj, Jaroslav (advisor)
Theoretical part of the thesis is aimed on the summary of material and testing parameters that influence SCG process and also the duration of FNCT test. The experimental part deals with the comparison of time to crack between two used surfactants – 2% Arkopal N110 and 10% sodium dodecylbenzenesulfonate. The temperature during the experiments was 80 °C. The acceleration of the process influenced by solution of sodium dodcelbenzenesulfonate was many times higher against solution of Arkopal. There were tested several HDPE and PP specimens to prove this phenomenon. HDPE specimens used – VB85, VL 20N, PL 10 that were made in UNIPETROL RPA and some other competitive materials were used. PP specimens were developed in labs of Polymer Institute Brno. In additional, another experimental part focuses on evolving the math definition of curves measured within FNCT tests and it is still in progress.
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Creep Behaviour of High-Density Polyethylene (HDPE)
Patzelt, Petr ; Přikryl, Zdeněk (referee) ; Petrůj, Jaroslav (advisor)
The theoretical part of the thesis deals with the summary of material properties and testing parameters that influence SCG process. The experimental part is aimed on the comparison of different condition effects on the process of FNCT and PENT. Chosen temperatures for PENT were 70; 80 and 90 °C and the applied nominal stress 2,0; 2,4 and 2,8 MPa. In the case of FNCT the chosen temperatures were the same and the ligamental stress was 4 MPa for all used environments which were: water, Arkopal N110 solution and Dehyton PL solution. In addition, several experiments were measuered under applied nominal stresses 3; 4; 5; 6; 8 a 10 MPa and at 80 °C in Arkopal N110 solution. The morphology of crack surfaces was studied afterwards. The obtained data were used for evaluaion by a five parameter equation.
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Study of conditions influence on the rate of crack propagation in HDPE
Patzelt, Petr ; Kučera, Jaroslav (referee) ; Petrůj, Jaroslav (advisor)
Theoretical part of the thesis is aimed on the summary of material and testing parameters that influence SCG process and also the duration of FNCT test. The experimental part deals with the comparison of time to crack between two used surfactants – 2% Arkopal N110 and 10% sodium dodecylbenzenesulfonate. The temperature during the experiments was 80 °C. The acceleration of the process influenced by solution of sodium dodcelbenzenesulfonate was many times higher against solution of Arkopal. There were tested several HDPE and PP specimens to prove this phenomenon. HDPE specimens used – VB85, VL 20N, PL 10 that were made in UNIPETROL RPA and some other competitive materials were used. PP specimens were developed in labs of Polymer Institute Brno. In additional, another experimental part focuses on evolving the math definition of curves measured within FNCT tests and it is still in progress.
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