期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 245, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2023.110317
关键词
Stochastic fiber misalignment; In-situ measurement; Microscopic; Angle-interlock woven composite; Compressive damage mechanism
In this study, the first in-situ measurements of fiber misalignments in 3D angle-interlock woven composites (3DAWCs) were conducted using a high-resolution optical microscope. It was found that the microscopic fiber misalignments follow a normal distribution. By incorporating realistic fiber misalignments into the model, the overestimated predictions can be effectively corrected, and better agreement with experimental results is achieved. Furthermore, the influence of fiber misalignments on compressive damage mechanisms was studied.
Stochastic fiber misalignments have been proven to have a significant impact on the compressive strength of traditional unidirectional laminates. However, these inherent manufacturing defects are rarely considered when dealing with 3D woven composites, due to the difficulty in characterizing the misalignment angles of individual fibers within all yarns. The current work provides the first in-situ measurements of fiber misalignments in 3D angle-interlock woven composites (3DAWCs) at the microscale, where the continuous fibers inside the warp, weft, and binder yarns are systematically examined using a high-resolution optical microscope. Statistical analysis reveals that the microscopic fiber misalignments follow a normal distribution, and the magnitude of the misalignment angle increases slightly with the degree of yarn fluctuation. Through a developed user subroutine, SDVINI, the obtained misalignment distributions are initialized in the corresponding yarns that belong to the constructed high-fidelity model. In comparison to the idealized one, the model introducing realistic fiber misalignments can effectively correct the overestimated predictions, and exhibits better agreement with the performed experiments. Furthermore, the influence of fiber misalignments on compressive damage mechanisms, particularly kinking failure, is also parametrically studied by incorporating different misalignment distributions.
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