Abstract
The present paper investigates the safety and effectiveness of chemical treatments of the frictional surface of high strength bolt frictional joints, followed by storage for three years. The primary results are as follows: 1. Relaxation is somewhat large immediately after chemical treatment. After treatment, the storage shows no significant influence on relaxation. 2. Chemical treatment shows little affect on deformation properties. 3. The coefficient of slip for the chemical treatment is lager than the specification value of 0.45 established by JASS 6, confirming its safety. 4. The effects of this chemical treatment and conventional treatment, as well as their relative relaxation, were small over the storage period. 5. The surface of the frictional surface that was chemically treated showed sudden rust immediately after treatment, but little change over the period of storage.
