通过物理试验和数值试验对衬里材料热-力学性质进行研究.对工业上测定高温、内压作用下的大型衬里设备材料导热系数时不能有效模拟环境载荷及升保温控制的问题,设计实际可行的室内升保温试验,对衬里材料在设备高温运行状态下导热性质进行研究.通过力学试验研究衬里材料力学性质和强度破坏形式,讨论衬里材料力学性质随围压的变化规律.将物理试验参数下的耦合数值试验结果与规范对比.研究结果表明:室内升保温试验和力学试验可作为衬里材料传热特性和力学性质参数获取的方案,为数值试验模拟实际工况提供数据支持;当金属质量分数升高时,同等围压条件下的衬里材料抗压强度有明显提高;当金属质量分数一定时,衬里抗压强度随着围压的增大而提高;随着围压增大,衬里弹性模量和本构曲线的斜率都增大,应力极值也相应提高,且在达到应力峰值后,轴向应力平缓下降,径向应力则逐渐趋于平稳;衬里层整体内侧受压,外侧受拉,具有应力不对称特征.物理试验与数值试验相结合是研究衬里材料热-力学性质的有效方法.%The thermal-mechanical properties of lining material were studied by physical tests and numerical simulation. Indoor heating-insulating test was designed to measure the thermal properties of lining material under the condition of high temperature, and the mechanical properties and failure mode of the liner with the confining pressure changing were studied by mechanical test. The thermal-mechanical numerical simulation based on the physics test result was conducted and compared with the standard regulation in ASME. The results show that the indoor heating-insulating test and mechanical test can be taken as ways to get the heat-transfer characteristics and mechanical properties of the lining material and provides data support to the simulation of real condition on numerical method. The compressive strength of lining material is improved significantly when the metal content increases and the compressive strength increases when the confining pressure increases with the metal content fixed. As the confining pressure increases, the elasticity modulus and the curve slope of constitutive increases, and the maximum stress increases correspondingly. When the stress reaches the peak, the axial stress gradually falls and radial stress gradually stabilizes. The inner layer is under pressure and the outer is under tension and it has a stress asymmetry. Combining physical testing with numerical simulation is an effective method for the study of lining material properties.
展开▼
