Tensile failure mechanism of RTM-made asymmetric composite T-joint

WANG Shuai; CHEN Mengxiong; LI Weidong; LUO Chuyang; PAN Lijian

doi:10.13801/j.cnki.fhclxb.20220125.003

Volume 40 Issue 1

Jan. 2023

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WANG Shuai, CHEN Mengxiong, LI Weidong, et al. Tensile failure mechanism of RTM-made asymmetric composite T-joint[J]. Acta Materiae Compositae Sinica, 2023, 40(1): 613-624. doi: 10.13801/j.cnki.fhclxb.20220125.003

Citation:

WANG Shuai, CHEN Mengxiong, LI Weidong, et al. Tensile failure mechanism of RTM-made asymmetric composite T-joint[J]. Acta Materiae Compositae Sinica, 2023, 40(1): 613-624. doi: 10.13801/j.cnki.fhclxb.20220125.003

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Tensile failure mechanism of RTM-made asymmetric composite T-joint

doi: 10.13801/j.cnki.fhclxb.20220125.003

1.
Collaborative Innovation Center for Civil Aviation Composites, Donghua University, Shanghai 201620, China
2.
Key Laboratory of Advanced Composites, Beijing Institute of Aeronautical Materials, AVIC Composites CO., LTD., Beijing 100095, China

Funds: Aviation Science Foundation (20180112008); Young Talent Lift Project (2016QNRC001); Shanghai Municipal Science and Technology Innovation Action Plan Project (19DZ1100300)

Received Date: 2021-11-15
Accepted Date: 2022-01-18
Rev Recd Date: 2022-01-09

Available Online: 2022-01-27

Publish Date: 2023-01-15

Abstract

Abstract

The tensile tests of structural symmetric and asymmetric composite T-joints prepared by resin transfer moulding (RTM) process were carried out, respectively. The failure process, structure stiffness and failure load of these composite T-joints were compared and analyzed. At the same time, the cohesive zone models (CZM) of composite T-joints were established and the failure process and failure mechanism of these two type T-joints were studied. The interlaminar stress of T-joints with different deflection angles were also compared. The test results show that the failure mode of structural asymmetric T-joint is different from that of symmetric T-joint. The existence of deflection angle causes higher stress at the large angle curved web than that of the small angle curved web, as a result, the initial crack of asymmetric T-joints orientationally occurs at the interface of triangular zone/curved web with large deflection angle. And then the crack directly propagates to the interface of large deflection angle flange/skin with 15.3% higher peak failure load than that of symmetric T-joints. The small bending deformation of the skin of asymmetric T-joint leads to the larger overall stiffness of the structure. The debonding of flange and skin is the prominent reason to the final failure of T-joint. The finite element analysis results show that the simulated peak failure loads of symmetric and asymmetric T-joints are within deviation. The simulated failure mode is in good agreement with the experiment. As the deflection angle increases, the interlaminar stress at the curved web of asymmetric T-joint decreases gradually, which indicates that the initial failure load of asymmetric T-joint may increase correspondingly. The position of initial crack will be shifted to the end of curved web at the same time.
- composite,
- T-joint,
- failure mechanism,
- finite element analysis,
- resin transfer moulding
Long Abstrsct
Innovation Points

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References(31)

References

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