The Impact of the Selected Exploitation Factors on the Adhesive Joints Strength

The aim of the present article is to determine the impact of the selected exploitation factors on strength of the wooden elements’ adhesive joints. Two types of adhesive joints were subject to experimental tests: butt adhesive joints and cross lap adhesive joints. Two types of adhesives were used: Prefere 6312 (a single-component PVAc adhesive for wood of D3 quality) and a two-component epoxy adhesive (Epidian 57/TFF/100:22). The exploitation factor under analysis was resistant to different temperature values above and below freezing. Six different variants of the joints’ ageing temperature value were used. The adhesive joints have been aged for 2 weeks (2 variants) and 3 months (3 variants). One ageing variant also included thermal shock (−40 °C/+60 °C), for which the ageing time was 2 months. A climatic/temperature chamber ESPEC SH 661 and a thermal shock chamber ESPEC TSE – 1 were used for ageing. Strength tests of the adhesive samples were carried out on the testing machine Zwick/Roell Z150, with accordance to the PN-EN 15870 standard. Based on the tests, it was observed that the adhesive joints of the wooden elements showed different dependencies between the strength and the ageing variant depending on the type of adhesive used. The results emphasise the importance of the temperature impact on the adhesive joints strength.