Wave scattering through frictional interfaces in soft materials
Başlık çevirisi mevcut değil.
- Tez No: 722363
- Danışmanlar: PROF. DR. MELİH ERİTEN
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2018
- Dil: İngilizce
- Üniversite: Unıversıty Of Wısconsın-Madıson
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Imaging techniques are used in medicine field. Particularly, magnetic resonance imaging techniques are used for detection of brain tumor. However, detection and location are not the all information about the tumor. Having pre-operative information about mechanical properties of the interface between brain and tumor can reduce the surgical risk. There are some studies to get pre-operative information about the brain and tumor interface. Although they are successful at a certain extent, they have deficiencies. For example, slip interface imaging (SII) is a technique for pre-operative information about the interface between brain and tumor. However, SII uses slip condition of the interface. This study aims to use more comprehensive interface models which involve also stick conditions in order to explain interface behaviors. Eventually, comprehensive interface models help to increase the accuracy of the imaging. In this study, a parametric study is done for 1-D wave scattering. Three parameters are used to characterize the mechanical interface properties. It is concluded that the changes in those parameters affect the wave scattering behaviors. For the experiments reported in this study, 5% and 10% porcine gelatin samples are used. In particular, interface shearing and wave scattering tests are conducted on those samples. Interface shearing tests yield the gelatin's shear properties (such as maximum stick shear stress and stick v slip ratio) for different cases. Besides, sample's shear modulus is measured with interface shearing tester. Mean shear moduli measured are 2.5 kPa for 5% and 9.3 kPa for 10% gelatin samples. Maximum stick shear stresses are found to vary between 40 and 210 Pa for various material composition and interface conditions. The stick-slip ratios are found to vary between 1 and 1.4. The experimental results for wave scattering show that the relative displacement of the interface depends on the interface condition for the same input displacements. As the lubrication on the interface increases, relative displacement of the interface for the same input displacement also increases. Future research will link dynamic response to other shear characteristics such as peak shear stress and stick-slip ratios of the interfaces between soft-hydrated materials.
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