Xie Weihua, Meng Songhe, Jin Hua, Du Chong, Wang Libin, Peng Tao, Scarpa Fabrizio, Xu Chenghai
Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China.
Sensors (Basel). 2016 Oct 13;16(10):1686. doi: 10.3390/s16101686.
This paper presents a simple methodology to perform a high temperature coupled thermo-mechanical test using ultra-high temperature ceramic material specimens (UHTCs), which are equipped with chemical composition gratings sensors (CCGs). The methodology also considers the presence of coupled loading within the response provided by the CCG sensors. The theoretical strain of the UHTCs specimens calculated with this technique shows a maximum relative error of 2.15% between the analytical and experimental data. To further verify the validity of the results from the tests, a Finite Element (FE) model has been developed to simulate the temperature, stress and strain fields within the UHTC structure equipped with the CCG. The results show that the compressive stress exceeds the material strength at the bonding area, and this originates a failure by fracture of the supporting structure in the hot environment. The results related to the strain fields show that the relative error with the experimental data decrease with an increase of temperature. The relative error is less than 15% when the temperature is higher than 200 °C, and only 6.71% at 695 °C.
本文提出了一种简单的方法，用于对配备化学成分光栅传感器（CCG）的超高温陶瓷材料试样（UHTC）进行高温耦合热机械测试。该方法还考虑了CCG传感器提供的响应中耦合载荷的存在。用该技术计算的UHTC试样的理论应变表明，分析数据与实验数据之间的最大相对误差为2.15%。为了进一步验证测试结果的有效性，开发了一个有限元（FE）模型来模拟配备CCG的UHTC结构内的温度、应力和应变场。结果表明，在粘结区域压应力超过了材料强度，这导致了热环境中支撑结构的断裂失效。与应变场相关的结果表明，与实验数据的相对误差随着温度的升高而减小。当温度高于200°C时，相对误差小于15%，在695°C时仅为6.�1%。
