Mechanical testing of friction drilled and form tapped bolt joints for abrasion resistant steel applications
Abstract
The paper presents an experimental study of usability of a friction drilled and form tapped bolt joints in ultra-high-strength abrasion resistant steel structures. Test material in this study was 2 mm thick ultra-high-strength abrasion resistant steel with nominal hardness of 400 HBW. The tensile strength and fatigue resistance of a single bolt joints were investigated taking also into account the thermal effects of friction drilling process. Hardness test showed that there was softened zone from the friction drilled hole causing fracture both under tensile and fatigue loading, but the fracture mechanism was also depended on load amplitude under fatigue loading. At high fatigue loads, the weakest link was always the bolt. The tensile and fatigue strength of the friction drilled and form tapped bolt joint was slightly weaker than rivet nut joint, but significantly stronger than the conventionally manufactured bolt joint.
- Publication:
-
Proceedings of the 22nd International ESAFORM Conference on Material Forming: ESAFORM 2019
- Pub Date:
- July 2019
- DOI:
- 10.1063/1.5112589
- Bibcode:
- 2019AIPC.2113e0025H