TY - THES

T1 - ANALYSIS OF A NEW TEST METHOD FOR HIGH RATE LOADING OF POLYMERS

AU - Flaggl, Edgar Peter

N1 - no embargo

PY - 2005

Y1 - 2005

N2 - Polymers are increasingly used in many applications where they have to withstand stresses and elongation due to impact loading. Unlike metals polymers exhibit rate dependent, visco-elastic, material properties. The possibility to characterize the fracture behaviour under high-rate loading is therefore very important. A standard test method has not been employed yet. The aim of this work was to describe the use of plate impact tests to investigate the applicability of a new method for measuring the high-rate fracture toughness of polymers. Results from previous research have been investigated and party confirmed. Furthermore, experiments have been performed to investigate the effect of the notch position. In the main testing programme four different polymers were tested and the fracture toughness was calculated. For polymethylmethacrylate (PMMA), the fracture toughness was calculated to be 0.55MPam^1/2 with a standard deviation of 0.32MPam^1/2 and for epoxy 0.36MPam^1/2 with a relatively low standard deviation of 0.09MPam^1/2. Polyvinylchloride (PVC) was difficult to evaluate due to the lack of results that showed fracture with crack arrest. For polycarbonate (PC), no appropriate results have been achieved. Extensive effort has been put into the further development of the testing and data acquisition facilities. A numerical analysis of the impact test using both a finite volume and a finite element analysis has been performed. The method looks promising for brittle polymers

AB - Polymers are increasingly used in many applications where they have to withstand stresses and elongation due to impact loading. Unlike metals polymers exhibit rate dependent, visco-elastic, material properties. The possibility to characterize the fracture behaviour under high-rate loading is therefore very important. A standard test method has not been employed yet. The aim of this work was to describe the use of plate impact tests to investigate the applicability of a new method for measuring the high-rate fracture toughness of polymers. Results from previous research have been investigated and party confirmed. Furthermore, experiments have been performed to investigate the effect of the notch position. In the main testing programme four different polymers were tested and the fracture toughness was calculated. For polymethylmethacrylate (PMMA), the fracture toughness was calculated to be 0.55MPam^1/2 with a standard deviation of 0.32MPam^1/2 and for epoxy 0.36MPam^1/2 with a relatively low standard deviation of 0.09MPam^1/2. Polyvinylchloride (PVC) was difficult to evaluate due to the lack of results that showed fracture with crack arrest. For polycarbonate (PC), no appropriate results have been achieved. Extensive effort has been put into the further development of the testing and data acquisition facilities. A numerical analysis of the impact test using both a finite volume and a finite element analysis has been performed. The method looks promising for brittle polymers

KW - Bruchzähigkeit

KW - PMMA Bruchzähigkeit

KW - PC Bruchzähigkeit

KW - PVC Bruchzähigkeit

KW - Epoxy Impact Gaskanone

KW - Bruchmechanik Finite Elemente

KW - Bruchmechanik Finite Volumen

KW - Bruchmechanik Spannungsfortpflanzung

KW - Impact Bruchzähigkeit

KW - Polymere

KW - fracture toughness

KW - PMMA fracture toughness

KW - EPOXY fracture toughness

KW - PVC fracture toughness

KW - PC finite element

KW - fracture finite volume

KW - fracture fracture

KW - polymers Gas-Gun Impact

KW - fracture stress waves

KW - polymers

M3 - Diploma Thesis

ER -