基于光学引伸计的PLA材料拉伸性能测试  

Measurement of Tensile Properties of PLA Materials Based on Optical Extensometer

作　　者：朱飞鹏[1,2] 李荣杰 白鹏翔 康新[3] ZHU Feipeng;LI Rongjie;BAI Pengxiang;KANG Xin(College of Mechanics and Engineering Science,Hohai University,Nanjing 211100,Jiangsu,China;CAD/CAM Fujian Province University Engineering Research Center,Putian 351100,Fujian,China;School of Electromechanical and Information Engineering,Putian University,Putian 351100,Fujian,China)

机构地区：[1]河海大学力学与工程科学学院,江苏南京211100 [2]CAD/CAM福建省高校工程研究中心,福建莆田351100 [3]莆田学院机电与信息工程学院,福建莆田351100

出　　处：《力学季刊》2024年第4期953-960,共8页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(12172120)。

摘　　要：聚乳酸(Polylactic Acid,PLA)材料是增材制造领域广泛使用的一种材料,虽然目前对PLA材料力学性能的研究较多,但大多采用应变电测等传统接触式方法,这些方法存在难以适用于复杂环境、操作繁琐等问题.本研究将采用基于双斜方棱镜和数字图像相关(Digital Image Correlation,DIC)的非接触式光学引伸计对3D打印PLA试样的拉伸力学性能进行测试.通过PLA试样标准单轴拉伸试验,得到基于光学引伸计方法的应变测量结果,以及弹性模量、泊松比、强度和延伸率等力学性能参数,且与修正后的电测方法相比,弹性模量与泊松比测量误差仅有0.12%和0.34%.实验结果表明非接触式光学引伸计在精度方面达到了较高水平,展现了其在复杂环境下进行材料性能测试的巨大潜力.Polylactic acid(PLA)material is widely utilized in the field of additive manufacturing.Despite numerous studies were conducted on the mechanical properties of PLA materials,most of them employed traditional contact methods,such as strain electrical measurement,which posed challenges such as inadaptability to complex environments and cumbersome operation.In this study,a non-contact optical extensometer integrating dual-rhombic prisms and digital image correlation(DIC)is used to test the tensile mechanical properties of the 3D printed PLA specimens.Through the standard uniaxial tensile tests on PLA specimens,the strain was measured and the mechanical properties such as the elastic modulus,Poisson's ratio,strength,and elongation were obtained using the optical extensometer method.Compared with the refined strain gauge method,the non-contact technique exhibits minimal measurement errors,with deviations of merely 0.12%and 0.34%for elastic modulus and Poisson's ratio,respectively.The experimental results show that the non-contact optical extensometer has achieved a high level of accuracy,demonstrating its huge potential for measuring material properties in complex environments.

关 键 词：PLA材料 拉伸性能 光学引伸计 弹性模量 泊松比 

分 类 号：O348.1[理学—固体力学]