Nonlinear damping with respect to vibration amplitude is particularly important in mechanical dynamics. The addition of short fibers to damping materials is considered to result in strong nonlinear damping due to interfacial peeling at the edges of the fibers. However, little has been reported on the occurrence of nonlinear damping in short-fiber reinforced rubber due to compounding difficulties. In this study, we investigated the relationship between the damping characteristics and deformation behavior of microdeformed short-fiber reinforced rubber by X-ray computed tomography (CT). We prepared a damping material with a natural rubber (NR) matrix and micrometer-sized polyethylene terephthalate (PET) fiber filler. The loss factor was identified by dynamic mechanical analysis, and three-dimensional strain maps were obtained using marker tracking in the CT data. The addition of 5 wt% PET fibers to NR resulted in an increase in the loss factor. Experimentally, we found that the nonlinear damping of the composite rubber is affected by the peeling of the filler/matrix interface and the strain inside the material.

中文翻译：

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纤维取向对短纤维增强天然橡胶非线性阻尼和内部微变形的影响

相对于振动幅度的非线性阻尼在机械动力学中尤为重要。由于纤维边缘的界面剥离，向阻尼材料添加短纤维被认为会导致强非线性阻尼。然而，由于复合困难，在短纤维增强橡胶中发生非线性阻尼的报道很少。在这项研究中，我们通过 X 射线计算机断层扫描 (CT) 研究了微变形短纤维增强橡胶的阻尼特性与变形行为之间的关系。我们制备了一种具有天然橡胶 (NR) 基体和微米级聚对苯二甲酸乙二醇酯 (PET) 纤维填料的阻尼材料。损耗因子通过动态力学分析确定，并使用 CT 数据中的标记跟踪获得三维应变图。将 5 wt% PET 纤维添加到 NR 导致损耗因子增加。通过实验，我们发现复合橡胶的非线性阻尼受到填料/基体界面剥离和材料内部应变的影响。