Unraveling Non‐Uniform Strain‐Induced Crystallization Near a Crack Tip in Natural Rubber
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Published:2024-01-16
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ISSN:2198-3844
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Container-title:Advanced Science
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language:en
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Short-container-title:Advanced Science
Author:
Mai Thanh‐Tam1,
Yasui Tomohiro2,
Tanaka Ruito2,
Masunaga Hiroyasu3,
Kabe Taizo3,
Tsunoda Katsuhiko4,
Sakurai Shinichi2,
Urayama Kenji1ORCID
Affiliation:
1. Department of Material Chemistry Graduate School of Engineering Kyoto University Nishikyo‐ku Kyoto 615‐8510 Japan
2. Department of Biobased Materials Science Kyoto Institute of Technology Kyoto 606‐8585 Japan
3. Japan Synchrotron Radiation Research Institute Sayo‐gun Hyogo 679‐5198 Japan
4. Sustainable and Advanced Materials Division Bridgestone Corporation Tokyo 187‐8531 Japan
Abstract
AbstractStrain‐induced crystallization (SIC) in natural rubber (NR) near crack tips significantly enhances crack growth resistance, but understanding the interplay between local strain field and crystallization remains challenging due to confined and heterogeneous characteristics. Using micro‐scale digital image correlation (DIC) and scanning wide‐angle X‐ray diffraction (WAXD, with a narrow 10 µm square beam), this study maps local strain tensor properties and SIC in the vicinity of the crack tip and its peripheral zone (≈3 mm × 1 mm area). The analysis reveals a significant correlation between these properties. In the peripheral zone, there is a noticeable deviation of both the principal strain axis and the crystal orientation from the crack opening direction. These deviations are linearly correlated, which indicates that shear strain plays a significant role in determining the crystal orientation. Crucially, the maximum tensile component in the tensor of local principal strains predominantly dictates local crystallinity. This simplicity is attributed to the limited variation in types of deformation within the SIC region, with corresponding to deformations falling between planar and uniaxial stretching. These findings pave the way for predicting crystallinity distribution using solely strain field data, offering valuable insights into the role of SIC in enhancing the crack growth resistance of NR.
Funder
Japan Science and Technology Corporation
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)