Advanced

Correlation of microstructural damage to functional properties of irradiated carbon fibre based composites used in neutron chopper discs

Molin, Hanna LU (2019) In ISRN LUTFD2/TFHF-19/5233-SE(1-109) FHLM01 20191
Solid Mechanics
Abstract
Understanding material behaviour has in the past enabled human development and
will continue to characterize the various stages of our future development. The use of neutrons will greatly affect several research areas, such as sustainable energy
production and cancer research, due to their interaction with nuclei. Neutrons will thus interact differently depending on the specific isotope, reveal information on crystal and magnetic structure and track dynamics of atoms.
The European Spallation Source is currently under construction and can be compared
to a giant powerful neutron microscope which is a huge step forward in everyday life science. To meet the need of each research area, numerous techniques and
methodologies are required. To... (More)
Understanding material behaviour has in the past enabled human development and
will continue to characterize the various stages of our future development. The use of neutrons will greatly affect several research areas, such as sustainable energy
production and cancer research, due to their interaction with nuclei. Neutrons will thus interact differently depending on the specific isotope, reveal information on crystal and magnetic structure and track dynamics of atoms.
The European Spallation Source is currently under construction and can be compared
to a giant powerful neutron microscope which is a huge step forward in everyday life science. To meet the need of each research area, numerous techniques and
methodologies are required. To optimize performance, different energy spectra of the neutrons are needed depending on the research area. A neutron chopper is a type of mechanical neutron filter which filters out the wanted energy spectra. One of the most crucial components of the neutron chopper is the disc, made of carbon fibre reinforced epoxy, which will be in contact with the neutron beam. It is thus necessary to analyse the impact of radiation on the neutron chopper disc.
To investigate whether the radiation damage is universal between different types of
epoxy, two different epoxy resins were used. Each type of composite was then irradiated with 0, 3, 10 and 30 MGy. Using X-ray tomography in combination with a porosity analysis it was seen that the number of pores increased with radiation dose. However, this effect was only seen in one of the composites meaning that the radiation damage is not universal between different types of epoxy. It was seen that more elliptic medium sized pores are favourable. However, the mechanical properties, tested using three-point bending, showed no apparent change after exposures. Scanning electron microscopy revealed no evident changes of the fracture surfaces after irradiation. In totality, the results helped ESS to confidently select the type of epoxy that will ensure the longest neutron chopper disc lifetime and highest neutron instrument availability. (Less)
Popular Abstract
The European Spallation Source can be considered a giant powerful neutron microscope, enabling detailed material study. Depending on the research area, different energy spectra of the neutron beam are required. The neutron chopper disc is a mechanical filter selecting the wanted energy spectra. It is crucial to investigate the effect of radiation on this disc.
Please use this url to cite or link to this publication:
author
Molin, Hanna LU
supervisor
organization
course
FHLM01 20191
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
radiation, epoxy, carbon fiber, CFRP, ESS, European Spallation Source
publication/series
ISRN LUTFD2/TFHF-19/5233-SE(1-109)
report number
TFHF- 5233
language
English
id
8973556
date added to LUP
2019-03-28 14:30:02
date last changed
2019-03-28 14:30:02
@misc{8973556,
  abstract     = {Understanding material behaviour has in the past enabled human development and
will continue to characterize the various stages of our future development. The use of neutrons will greatly affect several research areas, such as sustainable energy
production and cancer research, due to their interaction with nuclei. Neutrons will thus interact differently depending on the specific isotope, reveal information on crystal and magnetic structure and track dynamics of atoms.
The European Spallation Source is currently under construction and can be compared
to a giant powerful neutron microscope which is a huge step forward in everyday life science. To meet the need of each research area, numerous techniques and
methodologies are required. To optimize performance, different energy spectra of the neutrons are needed depending on the research area. A neutron chopper is a type of mechanical neutron filter which filters out the wanted energy spectra. One of the most crucial components of the neutron chopper is the disc, made of carbon fibre reinforced epoxy, which will be in contact with the neutron beam. It is thus necessary to analyse the impact of radiation on the neutron chopper disc.
To investigate whether the radiation damage is universal between different types of
epoxy, two different epoxy resins were used. Each type of composite was then irradiated with 0, 3, 10 and 30 MGy. Using X-ray tomography in combination with a porosity analysis it was seen that the number of pores increased with radiation dose. However, this effect was only seen in one of the composites meaning that the radiation damage is not universal between different types of epoxy. It was seen that more elliptic medium sized pores are favourable. However, the mechanical properties, tested using three-point bending, showed no apparent change after exposures. Scanning electron microscopy revealed no evident changes of the fracture surfaces after irradiation. In totality, the results helped ESS to confidently select the type of epoxy that will ensure the longest neutron chopper disc lifetime and highest neutron instrument availability.},
  author       = {Molin, Hanna},
  keyword      = {radiation,epoxy,carbon fiber,CFRP,ESS,European Spallation Source},
  language     = {eng},
  note         = {Student Paper},
  series       = {ISRN LUTFD2/TFHF-19/5233-SE(1-109)},
  title        = {Correlation of microstructural damage to functional properties of irradiated carbon fibre based composites used in neutron chopper discs},
  year         = {2019},
}