【作者】 李晓亚； 田晓耕；

【Author】 Xiaoya Li;Xiaogeng Tian;School of Aerospace,Xi’an Jiaotong University;

【机构】 西安交通大学航天航空学院；

【摘要】 皮肤的热力学研究涉及到生物热传导、烧伤、生物力学和生理学等复杂过程,尽管热疗法在皮肤损伤中得到广泛应用,但对于热刺激下皮肤的热力分析特性的机理研究相对还很少。本文基于无能量耗散的广义热弹(GN II型)理论研究了皮肤受到热刺激后的热传递过程和热所导致的力学响应。基于皮肤多层的非均质复杂结构,本文将皮肤看成两层复合结构,层与层之间为理想粘结。利用拉普拉斯变换方法获得了皮肤在瞬态热冲击下的热弹响应,研究了血液灌注率、界面条件等对响应和热损伤的影响。结果表明:GN II型理论下热波和弹性波都以有限的速度进行传播,在界面处发生反射和透射;血液灌注率的变化对热力响应和热损伤程度具有重要的影响。本文为深入理解和促进皮肤损伤临床应用的进一步发展提供了一定的理论基础。更多还原

【Abstract】 Thermo-mechanical analysis in biological tissue is a complicated process,involving bioheat transfer,biomechanics,burn damage and physiology. Comprehension of this phenomena in living tissue is very important to clinical applications. In present work,the generalized thermoelasticity theory without energy dissipation is used to investigate non-Fourier bioheat transfer process and heat-induced mechanical responses in human skin. The governing equations of bi-layered skin tissue are established and solved by the method of Laplace transformation. The influences of interface effect and blood perfusion rate on the responses are considered,the transient thermoelastic responses and thermal damage of the biological tissue are obtained and illustrated graphically. Numerical results show that: the thermal wave and elastic wave propagate with finite speed in skin tissue; the interface effect can induce a jump of temperature,which results in larger deformation and thermal damage around the interface; the temperature,displacement,stress and thermal damage near the interface decreases sharply with blood perfusion rate increasing. This paper provides a theoretical basis for understanding and promoting the further development of clinical application of skin injury.更多还原