摘要
论述隔热技术在军用装甲车辆上的应用意义,分析发动机燃烧室应用隔热技术存在的困难和关键问题.采用类比实验的方法,应用金属半固态加工理论和材料属性的研究方法,通过对金属陶瓷(以TiC-Ni为例)进行热模拟实验,研究金属陶瓷在高温下的变形规律和性能,从而探索性地研究陶瓷在高温下的破坏机理.实验和研究表明:基于经典弹塑性及蠕变理论的本构方程,非弹性应变在高温下其本质上是时间相关的.非弹性变形是由一单一的机理控制,宜用统一的方法,即把塑性及蠕变相联系起来的弹粘塑性本构方程来处理.根据热模拟实验数据,采用多元回归的方法拟合出反映某金属陶瓷在高温下变形性能的数学模型,最后应用数理统计的方法对建立的数学模型进行检验,结果表明建立的模型是合理的.
The signification of using heat insulation technology in a military armored vehicle was discussed. The difficulties and key problems of heat insulation technology in an engine were also analyzed. Based on the semisolid processing theory, material property research method and analogy testing method, hot simulation experiments were carried out to study the distortion rule and quality of cermets, such as TiC-Ni, at high temperature. The broken mechanism of cermets at high temperature was explored. The experimental and research results indicate that non-elasticity strain associate with time in nature according to constitutive equations of the classical elastic-plastic and creep theory. Non-elasticity strain should be expressed by uniform method for it is controlled by the single mechanism. Namely, it should be disposed by elastic-viscoplasticity constitutive equations which associate with plastic strain and creep strain. The mathematical model which can reflect the distortion character of cermets at high temperature was established by multiple regression analysis based on hot simulation experiment data, and statistical test of the mathematical model revealed that the mathematical model is reasonable.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2007年第2期220-225,共6页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.50275149)
关键词
金属陶瓷
热模拟
本构方程
多元回归
发动机
cermets
heat simulation experiment
constitutive equations
multiple regression
engine
