Effect of the SMA Trigger on the Energy Absorption Characteristics of CFRP Circular Tubes

• Published in: Journal of composite materials Vol. 44; no. 5; pp. 639 - 651
• Main Authors: Huang, Jian-Cheng, Wang, Xin-Wei
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01-03-2010; Sage Publications
• Subjects: Applied sciences; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Inelasticity (thermoplasticity, viscoplasticity...); Physics; Polymer industry, paints, wood; Solid mechanics; Structural and continuum mechanics; Technology of polymers; composites; shape memory alloy; energy absorption; axial crushing; triggers; crashworthiness; Tube; Prestress; Polymer fibers; Quasi static theory; Experimental study; Pinch out; Inelasticity; Energy characteristic; Shape memory alloy; Energy dissipation; Fibre reinforced plastics; Carbon fiber reinforced plastics; Axial load; Energy absorption; Crush; Static test; Mechanical shock; Carbon fiber
• ISSN: 0021-9983; 1530-793X
• DOI: 10.1177/0021998309347572

Quasi-static compressive tests were performed on carbon fiber reinforced polymer (CFRP) circular tubes to examine their axial crushing behaviors. Stable progressive crushing processes with brittle fracturing crushing mode were observed during the experiments. It is found that the crushing triggers including the ply drop off trigger and the shape memory alloy (SMA) trigger introduced in the specimens can efficiently initiate a stable progressive crushing process and significantly improve the specific energy absorption (SEA) as well as the crushing load efficiency (CLE) of the specimens. It is important to mention that the SMA trigger provides 37.2% increase of the SEA and 28.0% increase of the CLE, respectively, as compared with the specimens without a crushing trigger. Moreover, the SEA and the CLE of the composite tubes with the SMA trigger are 22.8% and 4.3% higher than those of specimens with the ply drop off trigger. In addition, the significant improvement of the SEA and the CLE is achieved with only a little increase of the initial peak-specific crushing stress.