Study on the effect of environmental exposure on tensile behavior of tapered composite structure

Su Cao; Zhuan Bao; Xiangming Chen; Jingchao Wei; Linan Cheng

doi:10.1117/12.3033899

5 July 2024 Study on the effect of environmental exposure on tensile behavior of tapered composite structure

Su Cao, Zhuan Bao, Xiangming Chen, Jingchao Wei, Linan Cheng

Proceedings Volume 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024); 131831M (2024) https://doi.org/10.1117/12.3033899
Event: The 3rd International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 2024, Wuhan, China

Abstract

Composite structures used in aircraft need to deal with a wide variety of climatic conditions, such as high temperature, cold temperature, and hydrothermal environment, which probably affects their bearing capability and life expectancy. Additionally, tapered composite laminates are commonly adopted to accommodate the need for varying thicknesses in aircraft structures. Consequently, environmental influence on the tapered composite structures has become a major concern in the utilization of composites. In this work, an experimental program is executed on the tapered composite structures in room temperature atmosphere (RTA), cold temperature dry (CTD), and elevated temperature wet (ETW) conditions separately. The results indicate that the large stress concentration induced by the presence of discontinuous plies in the tapered section motivates the occurrence of delamination at a relatively low load. Environmental exposure does not have a distinct effect on the delamination initiation load. In the hydrothermal environment, the degradation of tensile strength is negligible, and the delamination process as well as the failure pattern of ETW specimens are similar to RTA ones. However, cryogenic conditions result in a severely deteriorating effect on the tensile strength. The failure pattern of CTD specimens exhibits a brittle fracture characteristic and no obvious yield process is observed.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Su Cao, Zhuan Bao, Xiangming Chen, Jingchao Wei, and Linan Cheng "Study on the effect of environmental exposure on tensile behavior of tapered composite structure", Proc. SPIE 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 131831M (5 July 2024); https://doi.org/10.1117/12.3033899

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KEYWORDS

Composites

Air temperature

Matrices

Moisture

Materials properties

Discontinuities

Epoxies

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