Abstract Silicone-based materials can be applied on ship hulls to serve as foul release coatings. Depending on the application, coatings are not likely to have a uniform thickness. Pull-off tests of epoxy studs from silicone coatings with a thickness gradient found that for the thickest coatings, release initiated at the edge and proceeded inward with no bias in the peeling direction, and as the thickness decreased the release initiated on the thin side of the coating. Release mechanism and critical pull-off force were also affected. In this work, finite element models were developed to predict the detailed stress field at the silicone/epoxy interface in silicone coatings with a thickness gradient. Average coating thickness, thickness gradient, and Poisson's ratio were varied to determine changes in the value and location of the peak interface stress and determine the properties that produce the highest peak interface stress, which should correspond to the lowest critical pull-off force. While the peak stress increased with increasing thickness gradients in all cases, the optimal geometric properties depended on the Poisson's ratio of the coating, so the specific material chosen is an important factor. The location of the peak stress was nearly always on the thin side of the coating when a thickness gradient was present, although the exact location (i.e., edge or interior) also depended on the Poisson's ratio.

中文翻译：

---

使用有限元分析评估厚度梯度对承受拉脱载荷的薄涂层环氧树脂/硅树脂界面应力分布的影响

摘要 有机硅基材料可用于船体作为防污涂层。根据应用的不同，涂层不可能具有均匀的厚度。对具有厚度梯度的有机硅涂层环氧螺柱进行的拉拔试验发现，对于最厚的涂层，剥离在边缘开始并向内进行，剥离方向没有偏差，并且随着厚度的减小，剥离在薄侧开始涂层。释放机制和临界拉断力也受到影响。在这项工作中，开发了有限元模型来预测具有厚度梯度的有机硅涂层中有机硅/环氧树脂界面处的详细应力场。平均涂层厚度、厚度梯度和泊松' s 比率变化以确定峰值界面应力的值和位置的变化，并确定产生最高峰值界面应力的特性，这应该对应于最低的临界拉脱力。虽然在所有情况下峰值应力都随着厚度梯度的增加而增加，但最佳几何特性取决于涂层的泊松比，因此选择的特定材料是一个重要因素。当存在厚度梯度时，峰值应力的位置几乎总是在涂层的薄侧，尽管确切位置（即边缘或内部）也取决于泊松比。虽然在所有情况下峰值应力都随着厚度梯度的增加而增加，但最佳几何特性取决于涂层的泊松比，因此选择的特定材料是一个重要因素。当存在厚度梯度时，峰值应力的位置几乎总是在涂层的薄侧，尽管确切位置（即边缘或内部）也取决于泊松比。虽然在所有情况下峰值应力都随着厚度梯度的增加而增加，但最佳几何特性取决于涂层的泊松比，因此选择的特定材料是一个重要因素。当存在厚度梯度时，峰值应力的位置几乎总是在涂层的薄侧，尽管确切位置（即边缘或内部）也取决于泊松比。