基于溶剂诱导应力的PMMA灯罩开裂问题研究

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中图分类号：U465.4 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250154

Abstract：When the surface of a polymethyl methacrylate （PMMA）lampshade comes into contact with acleaning solutioncontainingalcohol-basedsolvents，itmaytrigerthereleaseofresidualstresses withinthematerial，leading to crackingandfailureof the lampshade.Toaddress this，2 typicalPMMA lampshade materials，8Nand HW55，are selected to investigate the fectsof surface temperature，annealing process，and solvent typeon their cracking behavior.Testresultsshow that HW55exhibitedsuperiorresistance tosolvent-induced cracking，withnocracks observed in cleaning solutions with ethanol concentrations ranging from 25% to 40% .Cracking only occurrs when the lampshade surface temperature reached 75°C and isopropanol-based cleaning solutions are used.In contrast， the 8N material does not crack at an ethanol concentration of 25% ，but cracks appear as the ethanol concentration increased or when isopropanol-based cleaning solutions are used.

Keywords：Internalstress，Lampshade，PMMA，Washingliquid

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