【作者】 王芳；

【导师】 李英骏；

【作者基本信息】 中国矿业大学（北京） ， 固体力学， 2010， 博士

【摘要】 基于室温下光弹材料载荷过程的红外热辐射测试结果,分析归纳了红外热辐射的共性特征。从固体材料的微观结构出发,结合相关的红外辐射理论、理论力学知识,分析论证了红外辐射特征的来源、影响因素及所属形变范围。在热力学理论和固体力学知识的基础上,从应变的角度推导得到计算红外辐射温度差(或能量差)的物理公式,结合有限元方法建立相应的弹性谐振体物理模型,并将其应用在光弹材料典型实验算例的红外辐射特征的模拟中,依据有限元分析模型得到试件的主应变分布,从而由公式得到红外辐射温度的改变和分布情况,达到定量描述红外辐射特征的目的。数据表明计算模拟求得的结果与实验结果吻合较好,充分说明定量公式及方法是合理的,可以用来量化描述光弹材料室温下形变的红外辐射特征,并且可以扩展应用到其它弹性固体材料的类似红外辐射特征的研究中。更多还原

【Abstract】 Based on experimental results of the photoelastics materials subjected to external loading in room-temperature, some common infrared radiation characteristics were analysed and concluded from lots of infrared radiation imaging patterns. By the micro-structure of the solid materials and corresponding infrared radiation principle, the resource and reflective factors and deformation range of common infrared radiation characteristics were analysed and investigated in microscopic, According to above phyisical microscopic mechanism, a formula of calculating temperature differences of infrared radiation in terms of principal strain sum was deduced to quantitatively investigate the infrared radiation characteristics in test by the thermodynamics and the solid mechanics, and combining the FEM, a elastic harmonic unit volume model was establishedthe. Typical specimens were tested and their principal strains were calculated by the FEM model in order to obtain the temperature differences of infrared radiation. Numerical results are in a good agreement with test results, which verifies the validity of the formula of calculating temperature differences of infrared radiation and the model of quantitatively describing the infrared radiation characteristics of solid photoelastic materials, and reveal corresponding inner physical mechanism. It was proved that the formula and corresponding model can be referenced for the study of similar infrared radiation characteristfor for other elastic solid material under loading.更多还原