PMI泡沫夹层结构整流罩冯卡门锥段成型技术研究

Processing Technology of Von Karman Fairing Fabricated by PMI Foam Sandwich Structure

对PMI泡沫夹层结构整流罩冯卡门锥段成型技术进行了研究,通过对玻璃钢面板及其泡沫夹层结构性能、面板成型、泡沫热成形、泡沫拼接、玻璃钢泡沫夹层结构成型及无损检测等技术研究,确定了玻璃钢外面板、预先固化,然后与泡沫等复合组装,最后铺覆内面板,整体进罐固化的成型工艺。结果表明,玻璃钢面板纵、横向拉伸强度为602、593 MPa,模量为26.0、27.2 GPa,满足设计强度≥350 MPa、模量≥25 GPa的要求;玻璃钢/PMI泡沫夹层结构泡沫密度为(110±10)kg/m3,厚度28 mm,纵、横向侧压强度为32.9、30.5 MPa、模量为2.31、2.38 GPa,满足设计指标侧压强度≥25 MPa、模量≥2.0 GPa的要求,采用玻璃钢/PMI泡沫夹层结构分步固化成型工艺研制的首件新型号整流罩冯卡门锥段,满足设计使用要求。

The processing technology of Von Karman Fairing Fabricated by PMI Foam Sandwich Structure was investigated. The processing method was determined by the investigation on the properties of glass fiber reinforced composite and foam structure, the thermoforming and splicing of foam, the processing of composite and sandwich structure, and the nondestructive testing technology. The results show that the lognitudinal and transverse strength of glass reinforced composite panel are respectively 602 MPa and 593 MPa. The lognitudinal and transverse modulus of panel are respectively 26.0 GPa and 27.2 GPa. The lognitudinal and transverse edgewise compression strength of foam sandwich structure with density of （110±10） kg/m^3 and thickness of 8mm are respectively 32.9 MPa and 30.5 MPa. The lognitudinal and transverse edgewise compression modulus of foam sandwich structure are respectively 2.31 GPa and 2.38 GPa. The mechanical properties of panel and foam sandwich can meet the design requirements. In addition, the lest Von Karman Fairing fabricated with the PMI foam sandwich structure with glass fiber reinforced composite panel by the step-cured processing can also meet the design requirement.