Effect of stress ratio on the fatigue fracture mechanism of adhesive single-lap joints: In case of GF/PP plates and an acrylic-based structural adhesive

Hiroyuki Oguma, Kimiyoshi Naito

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

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 languageEnglish
Pages (from-to)224-230
Number of pages7
JournalProcedia Structural Integrity
Volume19
DOIs
Publication statusPublished - 2019
EventFatigue Design 2019 - 8th edition of the International Conference on Fatigue Design - Senlis, France
Duration: 2019 Nov 202019 Nov 21

Keywords

  • Adhesive joint
  • Fatigue
  • GFRP
  • Multi-material design
  • Stress ratio
  • Structural adhesive

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