Experimental investigation on tensile behavior of CFRP bolted joints subjected to hydrothermal aging

Author:

Chen Hui1,Li Mingjie2,Shen Zhao2,Zhang Yitao3,Zhu Youhua1,Wu Ye24

Affiliation:

1. School of Hydraulic and Ecological Engineering, Nanchang Institute of Technology , Nanchang , China

2. School of Civil and Architecture Engineering, Nanchang Institute of Technology , Nanchang , China

3. College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics , Nanjing , China

4. College of Aerospace and Civil Engineering, Harbin Engineering University , Harbin , China

Abstract

Abstract With the help of bolted joints to assemble a complex structure, carbon fiber reinforced polymer composite (CFRP) is widely used in various fields. However, stress concentration around holes at the bolted joints leads to a decrease in bearing capacity. Composites often result in mechanical degradation subjected to a complex hydrothermal environment. Therefore, to study the tensile behavior of CFRP bolted joints subjected to hydrothermal aging, the tensile tests are conducted carefully. The influence of aging time and temperature on tensile strength is investigated based on the response history, strain contour, and failure morphology. The failure mechanism is revealed via digital image correlation technology. Finally, the experimental results demonstrate that the bearing capacity of the structure in hydrothermal aging decreases significantly. Compared with the unaged specimens, the peak force of the specimens aged for 6 weeks at 25°C and 65°C is reduced by 22.79% and 35.63%, respectively. Under both the unaged and aged, the same bearing failure is found in the tensile tests of CFRP single-bolt single-lap joints.

Publisher

Walter de Gruyter GmbH

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