| 1. |
- Andersson, Bo., et al.
(författare)
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Barnets rättigheter
- 2002
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Rapport (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Andersson, B. T., et al.
(författare)
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Radiographers’ academic development in Sweden: Towards and after a doctoral degree
- 2020
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Ingår i: Radiography. - : Elsevier BV. - 1078-8174. ; 26:4, s. 275-281
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Radiography is a young discipline and having radiographers with a doctoral degree is central for its development. Academic development of this field in Sweden has been evolving. This study explored the diagnostic radiographers’ prerequisites for doctoral studies, post-doctoral employment and research activities. Methods: Data were collected through a questionnaire designed to give insight into doctoral radiographers’ qualification paths, funding, doctoral status, employment and basic demography. Sixteen radiographers participated. A conventional content analysis was used. Results: The median age at dissertation defence was 53 for doctorates and 60 for licentiates. This indicates that after receiving the doctorate, there is short time left in the profession, increasing the challenge to develop the field. Most doctorates were employed within educational establishments. Unfortunately, few had supervised doctoral students, but those employed within academia contributed significantly to academic research. Conclusion: Compared to other Nordic countries, Sweden is at the forefront with a positive development in obtained high academic degrees. Nevertheless, there is an urgent need for post-doctorate radiographers in order to maintain the workforce to meet current and future demands. Radiographers with doctorates need to be consulted when planning research projects to establish a clear radiographic perspective. Swedish radiographers with a doctorate or licentiate have limited research time, indicating that Sweden may not invest enough in radiographic research. Implications for practice: There is a need for more doctoral positions and doctorates radiographers to supervise doctoral students. Clinical departments should recognise the benefits of having radiographic clinical research. © 2020
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| 3. |
- Andersson, B. T., et al.
(författare)
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Trends that have influenced the Swedish radiography profession over the last four decades
- 2017
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Ingår i: Radiography. - : Elsevier BV. - 1078-8174. ; 23:4, s. 292-297
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: The expansion of the radiography profession in recent decades has widened the scope of radiographic practice. This has raised questions about which trends have had an impact on the profession over the years. The study aim was to explore trends that have influenced the radiography profession over the last four decades. Methods: A qualitative design was used. Eleven focus group interviews inspired by the Scenario Planning Method were conducted at 11 diagnostic radiology departments in public hospitals in Sweden. The target group consisted of 48 registered radiographers. To analyse the data, qualitative content analysis was used. Results: Thematic data analysis revealed three broad categories; technological development and radiation doses, current status of the radiography profession and specialisation leading to expert knowledge. Each category derived from two or three sub-categories. Conclusion: The results demonstrate significant trends of influences on the radiography profession in Sweden over the last four decades. New methods and technology and control of radiation doses have had a favourable effect on the development of the radiography profession. Nevertheless, current status such as shortage of radiographers has had an adverse way. Specialisation leading to expert knowledge has an influence on career advancement and a specialist education regulated by the law, might be a prerequisite for the development of the radiography profession.
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| 4. |
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| 5. |
- Andersson, Henrik, et al.
(författare)
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Constitutive dependence in finite-element modelling of crack closure during fatigue
- 2004
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Ingår i: Fatigue & Fracture of Engineering Materials & Structures. - : Wiley. - 1460-2695 .- 8756-758X. ; 27:2, s. 75-87
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Tidskriftsartikel (refereegranskat)abstract
- The influence of choice of constitutive relation on the prediction of crack-opening stress for fatigue cracks using the finite-element method is investigated and compared with experimental results. Two different experimentally obtained stress–strain relations for IN718 at 550 °C were used for fitting material parameters to the linear kinematic and the Bodner–Partom viscoplastic constitutive models. In addition, one reference material description and one Bodner–Partom with parameters fitted to both types of experiment was used, i.e., in total six constitutive descriptions. Experimental values for crack-opening stress were found by the potential drop method for the two load cases analyzed. Two different load cases, load control and displacement control, have been examined. It turns out that the correlation between experimental and analytical crack-opening stress vary significantly with material description, opening criteria in the simulation and load case. The investigation shows that care must be taken when choosing material description and opening criteria for crack propagation simulations.
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| 6. |
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| 7. |
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| 8. |
- Andersson, Michael, et al.
(författare)
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Experimental and numerical investigation of crack closure measurements with electrical potential drop technique
- 2006
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Ingår i: International Journal of Fatigue. - : Elsevier BV. - 1879-3452 .- 0142-1123. ; 28:9, s. 1059-1068
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Tidskriftsartikel (refereegranskat)abstract
- Crack closure measurements during fatigue crack propagation using the electrical potential drop (PD) technique is evaluated using a combination of experiments and simulations. From finite element simulations it is shown that variations in the potential drop value over a fatigue cycle can be explained by crack closure and strain induced conductivity changes. It is also demonstrated that closure measurements made with PD are consistent with closure observations made from in situ SEM observations of crack closure. Finally, it was observed that closure measurements made by a compliance-based measuring technique gave a somewhat lower opening load as compared to the PD-measurement.
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| 9. |
- Andersson, Michael, et al.
(författare)
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Fatigue crack propagation in Ti-6Al-4V subjected to high strain amplitudes
- 2005
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Ingår i: Fatigue & Fracture of Engineering Materials & Structures. - : Wiley. - 1460-2695. ; 28:3, s. 301-308
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Tidskriftsartikel (refereegranskat)abstract
- Fatigue crack propagation in circular Ti-6Al-4V specimens subjected to high strain amplitudes has been investigated. Crack closure was measured with an electrical potential-drop technique. Closure was shown not to depend on strain ratio but to be a function of the applied strain range. At higher strain ranges, the crack was found to be closed for a smaller part of the load cycle than at lower strain ranges due to blunting of the crack tip. Furthermore, the use of a strain-intensity approach to predict crack-propagation rate was investigated, and it was found that for the upper parts of the da/dN curves the effective strain intensity yields good predictions. Also, the effective stress-intensity factor was found to collapse the da/dN curves for different load ratios.
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| 10. |
- Andersson, Michael, et al.
(författare)
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High-temperature fatigue crack growth in Inconel 718 subjected to high strain amplitudes
- 2006
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Ingår i: Fatigue & Fracture of Engineering Materials & Structures. - : Wiley. - 1460-2695. ; 29:11, s. 863-875
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Tidskriftsartikel (refereegranskat)abstract
- Fatigue crack growth experiments in Inconel 718 subjected to high strain amplitudes at 650 degrees C have been conducted. In the study the effects of load amplitude, ratio and frequency have been investigated. It was found that crack growth is a mixture of cyclic and time dependent mechanisms, depending on the load frequency. The load frequency was also found to have a strong influence on the crack growth rate. Also, crack closure was found to play an important role. By using an effective F-integral and including a frequency compensation term it was possible to summarize crack growth data into an empirical life prediction law, which seems to be in reasonable agreement with data from other studies.
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