Автор: Vassil Jivkov

Статии

STUDY ON STIFFNESS COEFFICIENTS UNDER BENDING TEST OF END CORNER DETACHABLE JOINTS OF STRUCTURAL ELEMENTS MADE OF PLYWOOD

Автори: Ralitsa Simeonova, Assia Marinova, Vassil Jivkov

Резюме

In this study are given the results from investigation into stiffness of end corner detachable joints of structural elements made of beech veneer plywood. The stiffness coefficients under compression bending test have been determined. The highest stiffness is characteristic of joints with universal connector and screw for wood ø 6 х 90 and ø 6 х 80 mm while the lowest stiffness is typical of joints with Minifix with bolt, mounting in metal sleeve and direct mounting. The parameters of the screw joints have considerable impact on the stiffness characteristics of the joints.

It is recommended that the comparative data of bending strength be taken into consideration when selecting the type of joints in the construction of furniture made of plywood.

Ключови думи: furniture construction, plywood, joints, stiffness

EN Version

KEYNOTE ADDRESS IX INTERNATIONAL SCIENTIFIC AND TECHNICAL CONFERENCE INNOVATIONS IN FOREST INDUSTRY AND ENGINEERING DESIGN – INNO 2018 STATE AND TRENDS IN THE DEVELOPMENT OF THE WORLD, EUROPEAN AND BULGARIAN FURNITURE INDUSTRIES

Автори: Vassil Jivkov

Резюме

The present article focuses on the important furniture production and consumption data in the world, Europe and Bulgaria, data about the main exporters in the world and regionally and furniture import. Main conclusions related to world production, consumption, export and import of furniture are drawn. Analysis of the Bulgarian furniture production and the market development have been made. Main trends in furniture market development in the following years globally are given. The information is based on data provided by CSIL (Centre for Industrial Studies, Italy), including official statistical data about the 100 most important countries in the world where the population amount to 6.6 billion, representing 85% of the total population on earth, Eurostat, Bulgarian Chamber of Woodworking and Furniture Industry and the National Statistical Institute.

Ключови думи: furniture world market, furniture world consumption, furniture world export, furniture world import, furniture industry

EN Version

NORMS FOR DESTRUCTIVE BENDING MOMENTS OF T-SHAPE CORNER JOINTS OF FRAME STRUCTURAL ELEMENTS MADE OF SOLID SPRUCE WOOD WITH A CROSS-SECTION OF 50 Х 30 MM

Автори: Georgi Kyuchukov, Borislav Kyuchukov, Vassil Jivkov, Assia Marinova

Резюме

In the presented research are established the normative values for the destructive bending moments of the most common used T-shape corner joints of frame structural elements made of solid spruce wood with a cross-section of 50 х 30 mm in arm compression bending load.

The established normative values can be used for the needs of the preventive quality control of furniture production as well as for the strength design of the sitting furniture, tables, and beds. For that purpose, it is recommended to draw up these normative values as a normative document which to use in the inner factory control of furniture quality.

Ключови думи: corner joints of frame structural elements, destructive bending moments, solid spruce wood, norms for destruc-tive bending moments of T-shape corner joints

EN Version