Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Šakotos medienos tamprumo rodiklių nustatymas neardomuoju būdu ; Stiffness influence investigation in plain and branched timber using non-destructive method
Tree - one of the most popular building materials used today. In civil engineering timber found in dwellings construction and in the development of house interior. Structural wood used in construction is selected according to building regulations by the mechanical properties, physical appearance, moisture content and existing defects. The most common wood defects are branches, cracks, rots and damage caused by processing. In this master’s thesis will be tested the most common defect - rooted branch. In wood products knots are classified by quantity, size, surface area and depth. Branched places of timber determines the mechanical properties of wood. Rooted branch is identified as a dark, round spot, which is different in density and structure. During tree growing period braches are inclined up 90 degrees to the vertical. It happens that during tree growth period the branch is cut and the tree continues to grow as its parts remain inside the trunk. Classifying such defect is treated as a hole in the timber. One of the main objectives of the research work is to present Norwegian spruce (Picea abies (L.) Karst) how plain and branched timber differences operate in physical and mechanical scales. The results of the investigation will show distribution of the elasticity. Research project results will be presented graphically showing how branch changes mechanical and physical properties of plain wood. One of the main objectives of the thesis is to find a plain and branched wood elasticity using a non-destructive method. The method is applicable investigating various materials both solid and porous. Big advantage that experiment does not require mechanical processing, samples are affected by sound waves using special equipment. Sound waves parameters are considered in the literature review according to recent scientific publications, research work and various methodologies. The work consists of 9 parts: introduction, wood structure, elastic properties, mathematical calculation model, variety and nature of fundamental sound wave, wave propagation in solid and porous material, experimental part, conclusions and references. Work size - 81 p. text without appendixes, 40 illustrations, 5 tables, 77 bibliographic sources.
Šakotos medienos tamprumo rodiklių nustatymas neardomuoju būdu ; Stiffness influence investigation in plain and branched timber using non-destructive method
Tree - one of the most popular building materials used today. In civil engineering timber found in dwellings construction and in the development of house interior. Structural wood used in construction is selected according to building regulations by the mechanical properties, physical appearance, moisture content and existing defects. The most common wood defects are branches, cracks, rots and damage caused by processing. In this master’s thesis will be tested the most common defect - rooted branch. In wood products knots are classified by quantity, size, surface area and depth. Branched places of timber determines the mechanical properties of wood. Rooted branch is identified as a dark, round spot, which is different in density and structure. During tree growing period braches are inclined up 90 degrees to the vertical. It happens that during tree growth period the branch is cut and the tree continues to grow as its parts remain inside the trunk. Classifying such defect is treated as a hole in the timber. One of the main objectives of the research work is to present Norwegian spruce (Picea abies (L.) Karst) how plain and branched timber differences operate in physical and mechanical scales. The results of the investigation will show distribution of the elasticity. Research project results will be presented graphically showing how branch changes mechanical and physical properties of plain wood. One of the main objectives of the thesis is to find a plain and branched wood elasticity using a non-destructive method. The method is applicable investigating various materials both solid and porous. Big advantage that experiment does not require mechanical processing, samples are affected by sound waves using special equipment. Sound waves parameters are considered in the literature review according to recent scientific publications, research work and various methodologies. The work consists of 9 parts: introduction, wood structure, elastic properties, mathematical calculation model, variety and nature of fundamental sound wave, wave propagation in solid and porous material, experimental part, conclusions and references. Work size - 81 p. text without appendixes, 40 illustrations, 5 tables, 77 bibliographic sources.
Šakotos medienos tamprumo rodiklių nustatymas neardomuoju būdu ; Stiffness influence investigation in plain and branched timber using non-destructive method
Randamanskas, Romualdas (Autor:in) / Gailius, Albinas
10.06.2015
Hochschulschrift
Elektronische Ressource
Lithuanian , Englisch
DDC:
690