Study On The Embedded HNBR Damping Film Co-cured Composite Structure

The embedded co-cured composite damping structure because of its good comprehensive mechanical properties has been widely used in high technical fields such as the aerospace and aeronautical etc. HNBR has good damping performance and comprehensive mechanical properties, embedded it in composite materials can greatly improve the dynamic damping properties of composite materials and can ensure the composite material with good bonding properties between the layers. This paper using orthogonal test and a large number of performance tests propose the HNBR viscoelastic damping material ingredients that can be applied to 120 ℃, 160 ℃ and 180 cur℃ ing composite materials, respectively. The composite damping structure specimens are manufactured with autoclave process, and interlayer shear test and modal test verify these three kinds of composite materials with good bonding properties between the layers and good dynamic damping performance. The relationship of the interlayer adhesion strength and dynamic damping performance with the thickness of damping layer is obtained in detail. The main works and innovation are listed in the following.1)The HNBR viscoelastic damping material ingredients that can be, respectively, applied to 120 ℃, 160 and 180 curing composite materials are presented by using ℃ ℃orthogonal test and a large number of performance tests.2)The damping materials are dissolved in tetrahydrofuran, a new type of solvent, to form viscoelastic material solution, and then the composite damping structure specimens are manufactured with the autoclave process and the brush coating process to produce damping membrane.3)The interlayer tensile and shear tests verify three kinds of composite material with good adhesion between the layers, and the relationship of the interlayer adhesion strength with the thickness of damping layer is obtained.4)The modal and free vibration decay tests verify the embedded composite materials with dynamic damping performance, and the relationship of the dynamic damping performance with the thickness of damping layer is obtained also. The conclusions of this paper provide a research foundation for design and wide use of the embedded HNBR damping film co-cured composite structure.