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Flexular Strength and Hydrolytic Stability of FRC/PFC Dental Bi-Material
Dombková, Julie ; Trautmann, Radoslav (referee) ; Poláček, Petr (advisor)
This thesis deals with the flexural strength of FRC/PFC dental bi-materials and their resistance degree to hydrolysis degradation. The block-shaped samples were exposed to the flexure in three points. The strength and modulus of elasticity were measured by multi-purpose test device called Zwick Z0100. Electron scanning microscope was used for observation of disrupted localities. From the outcomes gained result that the mechanical characteristics are affected by dipping of fibre composite, spatial organization of the support, water absorption of materials used and the matrix and the support adhesion.
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Effect of Structure of FRC and Adhesive on the Bond Strength of Joint between FRC and Particulate Filled Dental Composite
Bystřický, Zdeněk ; Přikryl, Radek (referee) ; Poláček, Petr (advisor)
This bachelor’s thesis investigates how is the strength of adhesive bond between dental FRC (Fiber Reinforced Composite) and adhesive affected by the type of reinforcement of dental FRC and by the type of adhesive. The nature of the fracture was investigated also. The strength of adhesive bond of the experimentally designed samples was measured using universal tensile testing machine in the specially constructed jaws. The nature of the fracture was viewed by the confocal microscope. The obtained results suggest that the strength of adhesive bond is mostly affected by the type of reinforcement of the FRC provided that there is a good wetting on the FRC surface. In this case, interlaminar strength of FRC was the limiting factor. The strength was lower in the case of FRC with multidirectional (spliced) glass fibers. The strength was also affected in a certain manner by the creation of locations where the stress was concentrated. This effect was most notably in the case of adhesives with the high cohesive strength. The impact of aqueous environment on the stability of adhesive joint was most major in the case of the low - crosslinked resins and in the case when the molecules of water penetrates into the interface between materials in consequence of poor wetting.
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Modeling aorta as a laminate with stiffness varying across the thickness
Kořínek, Tomáš ; Burša, Jiří (referee) ; Polzer, Stanislav (advisor)
This bachelor's thesis deals with computational solution of stress-strain states arising in idealized geometry of artery. Based on it's structure, wall is cosidered as a laminate of fiber rein-forced composite consisting of a network of elastin as a matrix and collagen fibers as reinforcement. Emphasis is placed on respecting of collagen fibers distribution and orientation on the thickness of the wall, which has a significant impact on it's mechanical properties. The behavior of this model is simulated using finite element programme ANSYS. The thesis also includes a research study of existing hyperelastic models of the aorta.
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Modeling aorta as a laminate with stiffness varying across the thickness
Kořínek, Tomáš ; Burša, Jiří (referee) ; Polzer, Stanislav (advisor)
This bachelor's thesis deals with computational solution of stress-strain states arising in idealized geometry of artery. Based on it's structure, wall is cosidered as a laminate of fiber rein-forced composite consisting of a network of elastin as a matrix and collagen fibers as reinforcement. Emphasis is placed on respecting of collagen fibers distribution and orientation on the thickness of the wall, which has a significant impact on it's mechanical properties. The behavior of this model is simulated using finite element programme ANSYS. The thesis also includes a research study of existing hyperelastic models of the aorta.
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Flexular Strength and Hydrolytic Stability of FRC/PFC Dental Bi-Material
Dombková, Julie ; Trautmann, Radoslav (referee) ; Poláček, Petr (advisor)
This thesis deals with the flexural strength of FRC/PFC dental bi-materials and their resistance degree to hydrolysis degradation. The block-shaped samples were exposed to the flexure in three points. The strength and modulus of elasticity were measured by multi-purpose test device called Zwick Z0100. Electron scanning microscope was used for observation of disrupted localities. From the outcomes gained result that the mechanical characteristics are affected by dipping of fibre composite, spatial organization of the support, water absorption of materials used and the matrix and the support adhesion.
|
|
|
Effect of Structure of FRC and Adhesive on the Bond Strength of Joint between FRC and Particulate Filled Dental Composite
Bystřický, Zdeněk ; Přikryl, Radek (referee) ; Poláček, Petr (advisor)
This bachelor’s thesis investigates how is the strength of adhesive bond between dental FRC (Fiber Reinforced Composite) and adhesive affected by the type of reinforcement of dental FRC and by the type of adhesive. The nature of the fracture was investigated also. The strength of adhesive bond of the experimentally designed samples was measured using universal tensile testing machine in the specially constructed jaws. The nature of the fracture was viewed by the confocal microscope. The obtained results suggest that the strength of adhesive bond is mostly affected by the type of reinforcement of the FRC provided that there is a good wetting on the FRC surface. In this case, interlaminar strength of FRC was the limiting factor. The strength was lower in the case of FRC with multidirectional (spliced) glass fibers. The strength was also affected in a certain manner by the creation of locations where the stress was concentrated. This effect was most notably in the case of adhesives with the high cohesive strength. The impact of aqueous environment on the stability of adhesive joint was most major in the case of the low - crosslinked resins and in the case when the molecules of water penetrates into the interface between materials in consequence of poor wetting.
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