Media influence on the fracture mechanical behavior of polyamide

Polyamide 6 (PA6) is a semi-crystalline, polar thermoplastic and one of the most important engineering plastics due to its good mechanical and chemical properties in combination with different additives. When absorbing water, nearly all properties of PA6 will change. This is the so called plasticizi...

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Bibliographic Details
Main Authors: Heyn, J., Bonten, C.
Format: Conference Proceeding
Language:English
Subjects:
Additives
Chemical properties
Crack initiation
Crack propagation
Ductile fracture
Energy absorption
Fracture mechanics
Mechanical properties
Organic chemistry
Polyamide resins
Polymers
Tensile tests
Thin films
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Summary:Polyamide 6 (PA6) is a semi-crystalline, polar thermoplastic and one of the most important engineering plastics due to its good mechanical and chemical properties in combination with different additives. When absorbing water, nearly all properties of PA6 will change. This is the so called plasticizing effect of water and it is well known for most of the mechanical properties. These changes are reversible, as long as PA6 is not damaged through hydrolysis. However, considering the fracture behavior and the energy absorption of PA6, this conclusion is not totally clear. The interaction between different media and polyamide can be analyzed in more detail by the use of the method of essential work of fracture (EWF) in comparison to determine the tensile test behavior. The method of EWF, which is well established for analyzing the fracture mechanics of ductile materials, is a concept of elastic plastic fracture mechanics and was first described by Broberg. The investigation on thin PA6 films demonstrates that the fracture behavior of PA6 is different for different media. Furthermore, the crack initiation process is weakly influenced, whereas the crack propagation process is strongly influenced, by a media uptake.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4965536