【作者】 王拓道；

【导师】 尹协振； 贾来兵；

【作者基本信息】 中国科学技术大学 ， 流体力学， 2011， 硕士

【摘要】 研究生物材料的力学性质是生物力学的重要内容之一,对于人类深入认识鱼类的游动机理有重要作用,而且具有重要的工程应用价值。本文设计了一种用于测量鱼体材料粘弹性性质的特种弯曲材料试验机,通过模拟鱼体摆动实验测量鲫鱼尾鳍及脊柱椎骨连接处的材料粘弹性性质,并采用复数型粘弹性本构模型对实验结果进行分析,讨论了材料粘弹性性质对于鱼类游动的贡献。本文研究工作的主要内容和结论如下:1.介绍特种弯曲材料试验机的研制过程,对装置中不同结构和系统进行详细说明并标定实验装置部件。2.分别进行弹性(铜片)和粘弹性(橡胶)材料试件实验,计算出材料的弹性特性和粘弹性特性,将计算结果与已知弹性体和粘弹性体特性进行对比,发现基本符合,表明本试验机设计的正确性。3.完成鲫鱼尾鳍鳍条实验,发现尾鳍摆动所需的力矩幅值M随摆幅的增大而增大。滞后相位角δ、耗散模量E2随摆幅和频率的增大而减小。储能模量E1在摆幅为3°时随着频率的增加而略有增加,在摆幅为5°时,随着频率的增加而减小。4.完成鲫鱼脊柱椎骨连接处实验,发现脊柱连接处前段所需力矩幅值要略大于后段所受力矩幅值。滞后相位角δ、耗散模量E2随频率的增加而减小,且脊柱后段δ、E2小于脊柱前段δ、E2。储能模量E1随频率增加略有下降,脊柱后段E1大于脊柱前段E1。滞后相位角很小,并随摆幅的增大而接近于0。更多还原

【Abstract】 The research of the mechanical property of the biomaterial is one of the most significant parts in the biomechanics, which plays an important role in understanding the mechanism of fish swimming and has important engineering value. In this thesis a special type of material test machine used in bending test was designed, which can be used to measure the viscoelastic properties of the fish material. Through simulating fish oscillation, the viscoelastic properties of the caudal fin and intervertebral joint in a crucian carp were measured, a complex number model was adopted to analyze the results of the biomaterial test and the effect of the viscoelastic on fish swimming was discussed.The main results of this thesis are as follows:1. Design process, the details of the structure and systems and the calibration of of the material test machine are presented.2. The specimens of an elastic material (coppor) and a viscoelastic material (rubber) are tested. The material characteristic is calculated. Comparison between the obtained results and the known properties of elastic and viscoelastic materials shows that the results are reasonable and the design of the test machine is suitable.3. Test results of the caudal fin ray in crucian show that the moment(M) needed by swinging the caudal fin increases as the swing amplitude, while the phase angleδof hysteresis and the loss modulus E2 decrease as the amplitude and the frequency increase. The storage modulus E1 increases slightly as the frequency for the amplitude of 3°, while it decreases for the amplitude of 5°.4. Testing results of the intervertebral joint in crucian show that the intervertebral joint in the anterior part of fish body needs larger moment than the posterior part. The phase angleδof hysteresis and loss modulus E2 decrease as the frequency increases.δand E2 of the intervertebral joints in the posterior part are less than in the anterior part. The storage modulus E1 decreases slightly as the frequency increases and E1 of the posterior part is larger than the anterior part. The phase angle of hysteresis is very small and close to zero as the amplitude increases.更多还原