Fastening solutions on composite structures: Progressive damage analysis of a unique bolted joint design for single-lap CFRP laminate

Abstract

This study tested a unique assembly method using single and multi-body sleeves with carbon fiber-reinforced plastic (CFRP) to improve load-carrying capacity in single-lap joints. Advanced techniques were implemented into FE code to simulate progressive material degradation behavior. Ti6-4 bolt, insert, and washers with AISI 304L sleeve joint were conceptually designed to keep bolt and nut together with less relative motion. Failure indices were reduced by 16–54%, damage initiation force was improved by 8–40%, and inter-plate clamp loss was reduced by 18% compared to the sleeveless design. Lateral load-carrying capability of joint and inter-plate clamp load significantly improved.

Keywords:

• Carbon laminate
• finite element analysis (FEA)
• progressive damage
• plastic deformation
• single-lap bolted joint

Acknowledgments

In memory of Prof. Dr. Onur Sayman, who educated us academically and has been an outstanding mentor and role model to us, we would like to express our deepest gratitude.

The simulation studies in this paper use Hexagon MI/MSC Software MARC finite element program. Hexagon MI, BIAS Muhendislik (Türkiye), and especially the Deputy General Manager of BIAS Muhendislik, Mr. Ender KOC, are acknowledged for providing the MARC Finite Element software.

Disclosure statement

No potential conflict of interest was reported by the author(s).