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Surface strain-based calculation of principal directional strains in multi-material carbon fiber laminates

  • Shuai Wang

    Shuai Wang was born in 1989. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and is engaged in the test research of new products. He has carried out experimental research on the performance of structural components of new products for railroad wagons, as well as research on the test methods of carbon fiber composites.

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    , Xiaofeng Li

    Xiaofeng Li was born in 1972. He is a professor and doctoral supervisor in the School of Locomotive and Vehicle Engineering, Dalian Jiaotong University. His research interests are vehicle CAE key technology and vehicle performance simulation and testing. He has carried out research on the basic theory of structural reliability of heavy trucks and the research and application of the latest methods for fatigue life prediction of welded structures.

    , Qiang Zhang

    Qiang Zhang was born in 1983. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a professorial senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and is engaged in the research of new product testing. He has carried out several studies on the vibration and fatigue reliability of new railroad wagons, as well as the performance test research of carbon fiber complete wagons.

    , Wenquan Li

    Wenquan Li was born in 1975. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a professorial senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and is engaged in the research of new product testing. Conducted research related to the cloud platform of railroad wagon load spectrum and participated in the development of the management system of big data cloud service.

    , Zhigang Li

    Zhigang Li was born in 1980. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a professorial senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and engaged in the design and development of new railroad wagon products.

    and Chunlei Zhao

    Chunlei Zhao

Published/Copyright: June 3, 2025
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Abstract

Carbon fiber laminates can be made of different materials stacked together, whether it is possible to analyze and calculate the main direction strain of each layer inside without being limited by the barrier between different materials by measuring the strain in the surface layer. The article takes laminates with different combinations of carbon fiber materials as the research object and uses the measurement methods of induced extensometer and strain gauges to compare and study the accuracy of the measured values and the calculation methods of the main direction strains of the internal layers of the laminates with different material combinations. The validity of the method is verified by comparing the calculated values with the finite element software. It is shown that this method can be used to calculate the principal directional strains of the internal layers of carbon fiber laminates under different material combinations of layups.


Corresponding author: Shuai Wang, College of Locomotive and Rolling Stock Engineering, Dalian Jiaotong University, Dalian 116028, China; and CRRC Qiqihar Rolling Stock Co., Ltd., Qiqihar 161002, China, E-mail:

About the authors

Shuai Wang

Shuai Wang was born in 1989. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and is engaged in the test research of new products. He has carried out experimental research on the performance of structural components of new products for railroad wagons, as well as research on the test methods of carbon fiber composites.

Xiaofeng Li

Xiaofeng Li was born in 1972. He is a professor and doctoral supervisor in the School of Locomotive and Vehicle Engineering, Dalian Jiaotong University. His research interests are vehicle CAE key technology and vehicle performance simulation and testing. He has carried out research on the basic theory of structural reliability of heavy trucks and the research and application of the latest methods for fatigue life prediction of welded structures.

Qiang Zhang

Qiang Zhang was born in 1983. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a professorial senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and is engaged in the research of new product testing. He has carried out several studies on the vibration and fatigue reliability of new railroad wagons, as well as the performance test research of carbon fiber complete wagons.

Wenquan Li

Wenquan Li was born in 1975. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a professorial senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and is engaged in the research of new product testing. Conducted research related to the cloud platform of railroad wagon load spectrum and participated in the development of the management system of big data cloud service.

Zhigang Li

Zhigang Li was born in 1980. He is currently a doctoral student at Dalian Jiaotong University, specializing in vehicle engineering. He is a professorial senior engineer in the Technology Development Center of CRRC QIQIHAR ROLLING STOCK CO., LTD. and engaged in the design and development of new railroad wagon products.

Chunlei Zhao

Chunlei Zhao

  1. Research ethics: Not applicable.

  2. Informed consent: Informed consent was obtained from all individuals included in this study, or their legal guardians or wards.

  3. Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission. Shuai Wang: Conceptualization, Formal analysis, Methodology, Validation, Writing – original draft. Xiaofeng Li: Funding acquisition, Methodology, Validation. Qiang Zhang: Formal analysis, Investigation. Wenquan Li: Data curation, Investigation, Resources. Zhigang Li: Investigation, Resources, Project administration. Chunlei Zhao: Validation, Resources.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The authors state no conflict of interest.

  6. Research funding: None declared.

  7. Data availability: Original data can be requested from the corresponding author by e-mail.

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Published Online: 2025-06-03
Published in Print: 2025-07-28

© 2025 Walter de Gruyter GmbH, Berlin/Boston

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