ABSTRACT

Advanced Marine Coatings (AMCs) are a combination of polyurethane technology with polyester technology. In this study, AMCs’ various formulations were tested for mechanical properties and lap shear strength between composite laminates and aluminum. Castings were fabricated for each formulation, and their mechanical properties were obtained through ASTM Testing. The lap shear strength between composite laminates and aluminum was determined by single lap shear testing. Numerical models were created to simulate the experimental lap joint testing and further analyze the adhesive at the joint using the mechanical properties obtained in this study. The numerical model was used to produce peel strain and shear strain contour plots of the adhesive and peel stress and shear stress distributions at the mid-layer of the adhesive at 85% failure load. The effects of changing the ratio of the polyurethane components on the AMC’s performance were also investigated. With the exception of failure shear strain, the mechanical properties were found to be inversely proportional to the amount of polyurethane added to the formulation. However, increasing the ratio of isocyanate to polyol increased the formulation’s mechanical properties at each formulation’s specified polyurethane percentage.

摘要

高级船舶涂料 (AMC) 是聚氨酯技术与聚酯技术的结合。在这项研究中，AMC 的各种配方在复合层压板和铝之间进行了机械性能和搭接剪切强度测试。为每种配方制造铸件，并通过 ASTM 测试获得其机械性能。复合层压板和铝之间的搭接剪切强度通过单搭接剪切试验确定。创建了数值模型来模拟实验搭接接头测试，并使用本研究中获得的机械性能进一步分析接头处的粘合剂。该数值模型用于生成粘合剂的剥离应变和剪切应变等值线图，以及在 85% 破坏载荷下粘合剂中间层的剥离应力和剪切应力分布。还研究了改变聚氨酯组分比例对 AMC 性能的影响。除了破坏剪切应变外，发现机械性能与添加到配方中的聚氨酯量成反比。然而，增加异氰酸酯与多元醇的比例会在每种配方的指定聚氨酯百分比下提高配方的机械性能。