Failure analysis of injection moulded parts using DSC
Bashyal, Umesh (2020)
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020053115619
https://urn.fi/URN:NBN:fi:amk-2020053115619
Tiivistelmä
The main purpose of this thesis was to study the use of differential scanning calorimetry (DSC) in the failure analysis of injection moulded plastics parts and focus on correctly interpreting data produced by Pyris software. DSC analysis was used to determine different chemical and physical properties of polymers where heat flows in and out of the samples were measured as a function of time and temperature.
PP and PLA injection moulded tensile test specimens (dogbones) produced in Arcada were chosen as the main subjects of study. Analysis of thermal properties between precise and imprecise PLA dogbone and between raw PP and imprecise PP dogbone were done in order to highlight reasons of failure (imprecise shape formation) in PLA and PP dogbones.
Thermal properties were studied for establishing experimental parameters in the new DSC calorimeter at Arcada, and further analysis was made using most relevant collected data. The information concluded after the experiments suggest that melting temperature is decreased in imprecise PLA dogbone than in precise PLA dogbone. Due to decrease in melting temperature, crystallinity temperature has also decreased in imprecise dogbone. So it suggests that difference in melting temperature in same material can be due to improper heat treatment in the process or improper timing in injection cycle. Similarly, analysis was made between raw PP and imprecise PP dogbone.
PP and PLA injection moulded tensile test specimens (dogbones) produced in Arcada were chosen as the main subjects of study. Analysis of thermal properties between precise and imprecise PLA dogbone and between raw PP and imprecise PP dogbone were done in order to highlight reasons of failure (imprecise shape formation) in PLA and PP dogbones.
Thermal properties were studied for establishing experimental parameters in the new DSC calorimeter at Arcada, and further analysis was made using most relevant collected data. The information concluded after the experiments suggest that melting temperature is decreased in imprecise PLA dogbone than in precise PLA dogbone. Due to decrease in melting temperature, crystallinity temperature has also decreased in imprecise dogbone. So it suggests that difference in melting temperature in same material can be due to improper heat treatment in the process or improper timing in injection cycle. Similarly, analysis was made between raw PP and imprecise PP dogbone.