基于线性加载区域的软组织预加载力消除方法  

The elimination method of preloading force for soft tissue based on the linear loading region

作　　者：于凌涛 杨景 王岚 李艳辉 崔健炜 YU Lingtao;YANG Jing;WANG Lan;LI Yanhui;CUI Jianwei(Laboratory of Intelligent Manufacturing and Robotics, College of Mechanical and Electrical Engineering, Harbin Engineering University,Harbin 150001,P.R.China;National and Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products,Zhejiang Sci-Tech University, Hangzhou 310018, P.R.China)

机构地区：[1]哈尔滨工程大学机电工程学院智能制造与机器人技术研究所,哈尔滨150001 [2]浙江理工大学机械与自动控制学院机电产品可靠性分析与测试国家地方联合工程研究中心,杭州310018

出　　处：《生物医学工程学杂志》2019年第4期619-626,共8页Journal of Biomedical Engineering

基　　金：黑龙江省自然科学基金资助项目(F2015034);中央高校基本科研业务费专项资金基础研究提升计划资助项目(HEUCFM170703)

摘　　要：针对软组织压缩实验中预加载力对其力学响应存在影响的问题,本文提出了一种基于线性加载区域的预加载力消除方法。通过对软组织进行多种预加载力的非受限压缩实验,分析了预加载力对本构模型参数的影响。在预加载阶段,将软组织力学响应作为线性模型,通过将预加载阶段响应考虑到整个响应过程来实现对预加载力的消除。针对非受限压缩实验的5种不同预加载力得到的力学响应,基于两种不同的软组织本构模型对该消除方法进行验证,并对比预加载力消除方法和传统方法得到的模型与实验结果的误差。结果显示消除预加载力方法得到的模型误差要明显小于传统方法,说明预加载力消除方法能够在一定程度上消除预加载力对软组织力学响应的影响,获得更接近软组织真实特性的本构模型参数。Aiming at the problem of the influence of preloading force on its mechanical response in soft tissue compression experiments, an elimination method of preloading force based on linear loading region is proposed. Unconfined compression experiments under a variety of different preloading forces are performed. The influence of the preloading force on the parameters of constitutive model is analyzed. In the preload phase, the mechanical response of the soft tissue is taken as a linear model. The preloading force is eliminated by taking the preloading phase into account throughout the response process. According to five different preloading forces of the unconfined compression experiments, the elimination method is validated with two different constitutive models of soft tissue, and the error between the models obtained by the preloading force elimination method and the traditional method with the experimental results is compared. The results show that the error obtained by preloading force elimination method is significantly smaller than the traditional method. The preloading force elimination method can eliminate the influence of preloading force on mechanical response to a certain extent, and constitutive model parameters which are closer to the true properties of soft tissue can be obtained.

关 键 词：软组织 预加载力 线性区域 本构模型 消除方法 

分 类 号：R318[医药卫生—生物医学工程]