title: Application of CCG Sensors to a High-Temperature Structure Subjected to Thermo-Mechanical Load.
abstract: 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.
authors.affiliation: Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. michael@hit.edu.cn.
authors.forename: Weihua
authors.initials: W
authors.lastname: Xie
authors.affiliation: Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. mengsh@hit.edu.cn.
authors.forename: Songhe
authors.initials: S
authors.lastname: Meng
authors.affiliation: Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. jinhua2007@hit.edu.cn.
authors.forename: Hua
authors.initials: H
authors.lastname: Jin
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China. duc@sari.ac.cn.
authors.forename: Chong
authors.initials: C
authors.lastname: Du
authors.affiliation: Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. wanglibin_hit@163.com.
authors.forename: Libin
authors.initials: L
authors.lastname: Wang
authors.affiliation: Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. boypengtao@163.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Peng
authors.affiliation: Advanced Composites Centre for Innovation and Science (ACCIS), University of Bristol, Bristol BS8 1TR, UK. f.scarpa@bristol.ac.uk.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Scarpa
authors.affiliation: Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China. hit-xuchenghai@163.com.
authors.forename: Chenghai
authors.initials: C
authors.lastname: Xu
keywords: chemical composition gratings (CCGs); fibre optic sensors; high temperature application; hot structure; strain and temperature; thermo-mechanical