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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Analýza mechanických vlastností kolíčníků piana
 Zatloukal, Petr
This work focuses on the analysis of the mechanical properties of piano pin blocks. Three pin block types were used, all made from multi-layered beech-plywood. Pin block were divided to eight sections, drilled and fitted by tuning pins. Tightening torque of tuning pins was measured using a torque wrench, depending on the diameter of the hole. Mechanical resistance of the material was measured by microdrill Resistograph. Density distribution in pin blocks and moisture content were determined with gravimetric method. The universal testing machine was used for determination of Janky's and Brinell's hardness, the mechanical properties in compression in plane of the board. Results of tests were evaluated using statistical methods and cross-correlated. A finite-element model in ANSYS software was built, in ordner to clarify the degree and distribution of stress around the hole for tuning pin. Statistically significant differences were found for properties of individual types of pin blocks (especially the density, hardness and compressive strength and tightening torque). Hardness differs significantly when tested perpendicular to the fibers in the plane and along the fibers in the edge. Measurements in individual sections of pin block brought uneven results and did not show statistically significant differences. Significant correlation was found only between the folowing characteristic: type A: the density distribution and the mechanical properties of the plane, density distribution and tightening torque after loosening. Type B: Resistograph resistance and tightening torque after 14 days, the density distribution and mechanical properties of the plane. Type C: density distribution and tightening torque after driving and loosening. Accurate results would be achieved by multiple measurements on multiple pieces of the pin blocks.
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