PLA-based additively manufactured samples with different infillpercentages under freeze-thaw cycles;mechanical,cracking,andmicrostructure characteristics  

作　　者：Reza Ale Ali Hamid Reza Karimi Razie Mohamadi 

机构地区：[1]Faculty of Marine Engineering,Khorramshahr University of Marine Science and Technology,Khouzestan 64199-34619,Iran [2]School of Civil Engineering,Iran University of Science and Technology(IUST),Tehran 16846-13114,Iran [3]School of Mechanical Engineering,Iran University of Science and Technology(IUST),Tehran 16846-13114,Iran

出　　处：《Theoretical & Applied Mechanics Letters》2024年第6期477-485,共9页力学快报(英文版)

基　　金：Khorramshahr University of Marine Science and Technology for supporting this work under research grant contract NO 209.

摘　　要：The layered nature of the parts produced by 3D printing makes them susceptible to freeze-thaw damage.Thisresearch investigates the effect of the freeze-thaw cycles on the tensile,bending,and fracture resistance of samplesmade of Polylactic acid material.For this purpose,the samples with 100,75,50,and 25 infill percentages weresubjected to 4,8,and 12 freeze-thaw cycles.The results show that the infill percentage and cycle affect freeze-thaw resistance.So,although for 100%infill samples,the 4,8,and 12 cycles averagely reduce the tensile strengthby 5,15,and 25.The same trends can also be seen for flexural strength and,more severely,fracture resistance.Reviewing the microstructure with a Scanning electron microscopy device shows freezethaw’s destructive effect(both the strand’s surface and their joints).In the end,simple statistical analyses were presented to evaluate amodel for anticipating the effect of freeze-thaw on mechanical resistance.

关 键 词：3D print FREEZE-THAW Mechanical behavior Microstructure FRACTURE 

分 类 号：TG1[金属学及工艺—金属学]