摩擦力和样品厚度对压痕法测量生物试样弹性的影响  

The effects of friction and specimen thickness on the measurement of biological specimen elasticity with indentation method

作　　者：严旭 高琦[2] 程茜[1] 周红生[2] 徐峥[1] YAN Xu GAO Qi CHENG Qian ZHOU Hong-sheng XU Zheng(Institute of Acoustics, Tongji University, Shanghai 200092, China Shanghai acoustics laboratory, Chinese Academy of Sciences, Shanghai 201815, China)

机构地区：[1]同济大学物理科学与工程学院,上海200092 [2]中国科学院声学研究所东海研究站,上海201815

出　　处：《声学技术》2017年第5期410-414,共5页Technical Acoustics

基　　金：国家自然科学基金资助项目11404245;11374231;11674249;国家重点研发计划项目2016YFA0100800;2012YQ150213

摘　　要：生物试样的弹性测量可为生物体疾病的早期诊断和治疗提供依据。利用压痕法对生物试样的弹性进行了测量,并用有限元软件对压痕过程进行了模拟。研究发现,试样厚度对弹性测量存在影响,试样厚度越大,测量结果越接近试样真实的杨氏模量。当试样厚度为压痕深度的75倍时,测量误差仅为0.74%。又研究了压头速度对弹性测量结果的影响。研究发现,当压头速度较大时,由于摩擦力的作用,测量结果与试样弹性的真实值之间存在一定的差异。在模拟过程中添加摩擦力可准确反演试样的弹性,误差在5%以下。The measurement of elasticity of biological samples can provide the basis for the early diagnosis and treatment of diseases. In this paper, the elasticity of biological samples is measured by indentation method. The indentation process is simulated by finite element software. Results indicate that the thickness of the sample influences the measurement of the elasticity. The measurement error is 0.74 % when the thickness of the specimen is 75 times of the indentation depth. The effect of indentation velocity on elasticity measurement has also been studied. It is found that there is a certain difference between the measured result and the true Young＇s modulus due to the effect of friction when the indentation velocity is high. The elasticity of the sample can be accurately calculated when the friction has been taken into account and the error of the calculated modulus is 5 % or less relative to the true modulus.

关 键 词：压痕法 弹性 有限元 摩擦力 

分 类 号：O429[理学—声学]