Abstract
Applications of bonding technology have been expanded for lightweight structures and multi-material designs; however, the strength estimation and design method for bonded structures have not been fully established. New design concepts and standards related to strength and reliability are required from industries. In this work, fatigue tests under different stress ratio conditions and fracture surface observations were carried out to investigate the influence of the stress ratio on the fracture mechanism of adhesively bonded structures. Tested material was a glass-fiber-reinforced polypropylene composite plate, and adhesive was an acrylic-based structural adhesive. With single-lap joint specimens, fatigue tests were conducted using uniaxial electro-hydraulic fatigue testing system; frequency was f = 10 Hz, and stress ratios were R = -1, -0.5, 0.1, 0.5, 0.7, and 0.9. The effects of mean load were observed under higher stress ratio conditions, and fatigue strength at 107 (10 million) cycles dramatically deceased when the stress ratio was larger than 0.5. Fracture surface observations revealed correlation between the fatigue properties and fracture mechanism.
| Original language | English |
|---|---|
| Pages (from-to) | 224-230 |
| Number of pages | 7 |
| Journal | Procedia Structural Integrity |
| Volume | 19 |
| DOIs | |
| Publication status | Published - 2019 |
| Externally published | Yes |
| Event | Fatigue Design 2019 - 8th edition of the International Conference on Fatigue Design - Senlis, France Duration: 2019 Nov 20 → 2019 Nov 21 |
Keywords
- Adhesive joint
- Fatigue
- GFRP
- Multi-material design
- Stress ratio
- Structural adhesive
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Civil and Structural Engineering
- Materials Science(all)