PMI泡沫吸湿变形仿真模型的构建及应用研究

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Construction and application research on the simulation model of moisture-induced deformation in PMI foam

FAN Wenbo 1∗ ，WANG Zhenlin'，WANGFulin'，WU Tong²，LV Nan 1 MA Jichuan'，YIN Rongying' （1.Harbin Hafei Aviation Industry Co.，Ltd.，Harbin 150060; 2.Harbin University of Science and Technology，Harbin 150006）

Abstract：Themoisture-induceddeformationbehaviorofPolymethacrylimide（PMI）foam，whichiscausedbymoistureabsorption during transportation and storage，is observed tocontinuously deform thefoam prior toand during machining processes.Asaresult，the post-machining shape ofthe foam deviates from its theoreticaldesign，failing to meet the machining accuracyrequirementsofcertainPMIfoamsandwichcomposite structuralcomponents.Inthisstudy，themoisture-induced deformation characteristicsof acommonlyused PMIfoam incompositesandwich components are experimentally measured. The coefficientsrelated tomoisture-induced expansionarefittd，andasimulationmodelforPMIfoammoistureaborption is constructed.Thetransient simulationresultscalculatedusing thismodelaredemonstratedtofall within thedeviation rangeof the measured datasets.Byapplying the model，thepotential deformationofPMIfoam parts inablade'sinternal structureunderexisting manufacturing processes iscomputed，showingconsistencywiththeinspectionesultsotainedduringactual production.This study provides guidance for the precise manufacturing processcontrolof PMI foam sandwich components.

Keywords：polymethacrylimide foam; hygroscopic deformation;sandwich composite;precision manufacturing

1引言

聚甲基丙烯酰亚胺（PMI）泡沫是一种完全闭孔的硬质泡沫塑料，具有高比强度、高比模量、高抗蠕变、高热变形温度，由于其内部单胞体之间联通性差，使其具有良好的抗吸湿性，其各向近似同性的力学性能也使其具备易加工的特质，因此泡沫夹层结构广泛应用于具备复杂气动外形的直升机旋翼类零件[1]。（剩余5607字）