Strength, fracture toughness and deformability of joints of drywall elements under bending
A. A. Barmotin, A. B. Kosik
Donbas National Academy of Civil Engineering and Architecture
Annotation: Contrary to GOST 6266-97, European regulatory framework, apart of the requirements and testing methods of drywall boards, regulates the characteristics and methods of testing of joints in which the requirements to puttying and reinforcing materials for sealing joints in standard and reinforced drywall boards are determined. It allows to conduct the analysis of prototype deformation. To study the work of joint, a series of experimental researches has been conducted. The main purpose of these researches is to determine the ultimate strength, fracture toughness and deformability of the most common single-layer and dual-layer drywall elements on the screw and glue joints. For this the universal installation has been designed, allowing to test the three- and four-point bending. Experimental studies have shown that within the elastic behavior the drywall elements work as a homogeneous solid material and in calculations can be presented as an orthotropic material with given (equivalent to) elastic properties, while bond σ−ε mending the Hooke’s law. In samples with a one-way amplification of section (additional reinforcement by glass fleece or adhesive and screw connection of layers) the tensile strength in each case is lightly increasing. The simultaneous presence of two extension factors results in a significant increase of fracture toughness, which reaches the tensile strength in bending with destruction of the sample on joint and in cross section.
Keywords: drywall boards, strength, deformability, orthotropic materials, crack resistance.
Pages: 177-188.
Link for citation: Barmotin, A. A.; Kosik, A. B. Strength, fracture toughness and deformability of joints of drywall elements under bending. – Text : electronic. – In: Modern Industrial and Civil Construction. – 2015. – Vol. 11, N 4. – Р. 177-188. – URL: https://donnasa.ru/publish_house/journals/spgs/2015-4/01_barmotin_kosik.pdf (date of access: 19.09.2024). (in Russian)
Vol. 11, N 4 (2015)Journal: Modern Industrial and Civil Construction
Publish house: Donbas National Academy of Civil Engineering and Architecture