Numerical Simulation on Thermal Shock Resistance of TiB2-Cu Interpenetrating Phase Composites

Based on the sensitivities of material properties to temperature and the complexity of service environment of thermal protection system on the spacecraft, ultrahigh-temperature ceramics (UHTCs), which are used as thermal protection materials, cannot simply consider thermal shock resistance (TSR) of the material its own but need to take the external constraint conditions and the thermal environment into full account. With the thermal shock numerical simulation on hafnium diboride (HfB2), a detailed study of the effects of the different external constraints and thermal environments on the TSR of UHTCs had been made. The influences of different initial temperatures, constraint strengths, and temperature change rates on the TSR of UHTCs are discussed. This study can provide a more intuitively visual understanding of the evolution of the TSR of UHTCs during actual operation conditions.

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Numerical Simulation of Temperature Field and Thermal Shock Resistance Property of Permeable Brick

High-Performance Ceramics V - Key Engineering Materials ◽

10.4028/0-87849-473-1.1152 ◽

2008 ◽

pp. 1152-1154

Author(s):

Hua Zhi Gu ◽

Hou Zhi Wang ◽

Mei Jie Zhang ◽

Ao Huang ◽

Wen Jie Zhang

Keyword(s):

Numerical Simulation ◽

Temperature Field ◽

Thermal Shock ◽

Thermal Shock Resistance ◽

Resistance Property ◽

Shock Resistance

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Numerical Simulation on Thermal Shock Resistance of TiB2-Cu Interpenetrating Phase Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.1551 ◽

2005 ◽

Vol 475-479 ◽

pp. 1551-1554

Author(s):

Chang Qing Hong ◽

Xing Hong Zhang ◽

Jie Cai Han ◽

Xiao Dong He

Keyword(s):

Thermal Shock ◽

Thermal Shock Resistance ◽

Stress Fields ◽

Severe Condition ◽

Copper Powders ◽

Arc Heater ◽

Shock Resistance ◽

Thermal Shock Behavior ◽

Experimental And Numerical Modeling ◽

Interpenetrating Phase Composites

TiB2-Cu Interpenetrating phase composites (IPCs) were prepared by combustion synthesis of elemental titanium, boron and copper powders. The synthesized product consisted of two spatial continuous phases: TiB2 and copper. Using the experimental data, thermo-physical and mechanical parameters of the materials established the temperature and stress fields made of FEM. Thermal shock behavior of TiB2-Cu IPCs was also investigated using a plasma torch arc heater and the results showed no cracks were found on the thermal shock surface of the TiB2-Cu IPCs. The experimental and numerical modeling results can be used to explain the actual thermal shock resistance and reveal its complex behavior under the severe condition.

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Numerical Simulation for Thermal Shock Resistance of Ultra-High Temperature Ceramics Considering the Effects of Initial Stress Field

Advances in Materials Science and Engineering ◽

10.1155/2011/757543 ◽

2011 ◽

Vol 2011 ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Weiguo Li ◽

Tianbao Cheng ◽

Dingyu Li ◽

Daining Fang

Keyword(s):

Numerical Simulation ◽

High Temperature ◽

Stress Field ◽

Thermal Shock ◽

Cooling Rate ◽

Thermal Shock Resistance ◽

Initial Temperature ◽

Ultra High Temperature Ceramics ◽

External Constraint ◽

Shock Resistance

Taking the hafnium diboride ceramic as an example, the effects of heating rate, cooling rate, thermal shock initial temperature, and external constraint on the thermal shock resistance (TSR) of ultra-high temperature ceramics (UHTCs) were studied through numerical simulation in this paper. The results show that the external constraint has an approximately linear influence on the critical rupture temperature difference of UHTCs. The external constraint prepares a compressive stress field in the structure because of the predefined temperature field, and this compressive stress field relieves the tension stress in the structure when it is cooled down and then it improves the TSR of UHTCs. As the thermal shock initial temperature, a danger heating rate (or cooling rate) exists where the critical temperature difference is the lowest.

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Numerical Simulation of Thermal Shock Tests of Carbon-Containing Refractories

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.660 ◽

2012 ◽

Vol 538-541 ◽

pp. 660-664

Author(s):

Hui Min Liu

Keyword(s):

Numerical Simulation ◽

Mathematical Model ◽

Finite Element Method ◽

Thermal Shock ◽

Thermal Shock Resistance ◽

Heating Process ◽

Stress Changes ◽

Quenching Process ◽

Shock Resistance ◽

The Mathematical Model

To appraise the thermal shock resistance of carbon-containing refractories correctly, its thermal stress changes in thermal shock tests were analyzed by finite element method, and the mathematical model appraising its thermal shock fracture was built. The results show when the sample of carbon-containing refractory suffers thermal shock, the main damaged areas lie its centre during sharp heating process, but the sides during quenching process. The later is the main reason causing its damage. When appraising the thermal shock resistance of carbon-containing refractory by dip spalling method, the result matches fracture index.

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Numerical Simulation for Thermal Shock Resistance of Thermal Protection Materials under Temperature Rising

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.1509 ◽

2011 ◽

Vol 197-198 ◽

pp. 1509-1514 ◽

Cited By ~ 3

Author(s):

Wei Guo Li ◽

Ding Yu Li ◽

Chao Wang ◽

Dai Ning Fang

Keyword(s):

Numerical Simulation ◽

Thermal Shock ◽

Thermal Shock Resistance ◽

Thermal Protection ◽

Thermal Environment ◽

Ultra High Temperature Ceramics ◽

Service Environment ◽

External Constraint ◽

Visual Understanding ◽

Shock Resistance

Due to the complexity of service environment of thermal protection system on the aerocraft, the thermal shock resistance (TSR) of ultra-high-temperature ceramics (UHTCs), which are used as thermal protection materials, is no longer the material itself’s. Based on the restrictions of current experiments and the lack of theories, hafnium diboride (HfB2) is used to study the effects of the external constraint conditions and different thermal environment on the TSR of the UHTC in detail. The effects of different initial temperature, different external constraint conditions, and temperature rising rate on the TSR of the UHTCs through numerical simulation are discussed in detail in this study. This study can provide a more intuitively visual understanding of the evolution of the TSR of UHTCs during actual causative conditions.

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