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摘要随着激光焊接技术的发展激光焊接过程实现了可人为控制，该应用已经被生物医学领域所重视——激光焊接生物组织可以应用于皮肤割伤后的缝合技术中。该技术具有低耗，高效，无痛等多种优势。 但是激光的相关参数，比如激光的功率，激光的光斑直径，焊枪的移动速度等的设定会直接或间接地影响到焊接的效果。ANSYS 软件可以依据人体皮肤的热物性参数，比如导热率，比热容，散射和吸收系数等和激光的各项参数，以及高斯热源公式进行建模，尽可能模拟实际的焊接情况。通过建模，优化各项指标，为激光作用在生物组织的过程进行理论指导。 通过对于高斯热源的分析，热损伤的相关理论，推导出即保证焊接的效率，又保证对于皮肤组织无损伤的两组优化数值。通过实验进行验证，得到 ANSYS软件的使用过程中有相对准确的拟合结果和误差，并且在结果的基础上进一步分析、讨论使得焊接效率不断提升的方法，比如在本次试验中使用单词扫描的原因，取用的功率范围的原因，以及相比较以往的实验最终选取较高焊接速度的必要性。最后讨论使用助焊剂，比如 BSA，印度墨水辅助实验的必要原因和优势和探讨激光生物组织焊接的研究，发展方向。 48080
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毕业论文关键词 激光，生物组织，ANSYS(US)，有限元模拟
Title Numerical simulation of laser welding of biological tissue
Abstract With the development of laser welding laser welding technology achieves can be artificially controlled, this application has been valued by the biomedical field - laser welding of biological tissue can be applied to skin lacerations after suturing technique. The technology has low consumption, efficient, painless and other advantages. However, the laser parameters such as laser power, laser spot diameter, the gun moving speed setting will affect, directly or indirectly, to the welding results. ANSYS software can be based on human skin thermal parameters, such as thermal conductivity, specific heat capacity parameters, scattering and absorption coefficient and lasers, as well as Gaussian heat equation modeling, as far as possible to simulate the actual welding conditions. Through modeling, optimization of the indicators, the role of theory to guide the laser in the process of biological tissue. For a Gaussian heat source by analyzing the theory of heat damage, welding is deduced which is to ensure the efficiency and optimize the value of the two groups to ensure no damage to the skin tissue. Verified by experiment to give the process of using ANSYS software has relatively accurate fitting results and error, and further analysis on the basis of the results of the discussion so that the welding efficiency and improve methods, such as using the word scanning in this Test reasons, reasons of access to power range, and compared to previous experiments and ultimately select the need for a high welding speed. Finally the use of flux, such as BSA, India ink reason necessary auxiliary experiment and explore and study the advantages of laser welding of biological tissue, the direction of development.
Keywords laser, biological tissue, ANSYS (US), finite element simulation.
目次
1绪论.1
1.1生物组织激光焊接技术1
1.2生物组织激光焊接技术研究概况..1
1.2.1国外研究概况1
1.2.2国内研究概况1
1.3主要研究内容2
2生物组织特性和热传输理论2
2.1皮肤结构2
2.2生物组织的热物理性能.2
2.3生物组织的热传输公式.3
2.3.1表面热流形式4
2.3.2体热源形式.4
2.4高斯公式..4
3激光焊接生物组织过程数值模拟.7
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