scholarly journals Temperature-dependence of acoustic fatigue life for thermal protection structures

2014 ◽  
Vol 4 (2) ◽  
pp. 021005 ◽  
Author(s):  
Yadong Zhou ◽  
Shaoqing Wu ◽  
Zhiyong Tan ◽  
Qingguo Fei
Keyword(s):  
Fatigue Life ◽  
Temperature Dependence ◽  
Thermal Protection ◽  
Acoustic Fatigue ◽  
Protection Structures

scholarly journals Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

2014 ◽  
Vol 6 ◽  
pp. 176891 ◽  
Author(s):  
Liu Liu ◽  
Qiong Guo ◽  
Tiren He
Keyword(s):  
Steady State ◽  
Fatigue Damage ◽  
Thermal Protection ◽  
Fatigue Analysis ◽  
Thermal Protection System ◽  
Protection System ◽  
Heat Transfer Analysis ◽  
Intensity Estimation ◽  
Acoustic Load ◽  
Acoustic Fatigue

In order to ensure integrity of thermal protection system (TPS) structure for hypersonic vehicles exposed to severe operating environments, a study is undertaken to investigate the response and thermal-acoustic fatigue damage of a representative multilayer TPS structure under combined thermal and acoustic loads. An unsteady-state flight of a hypersonic vehicle is composed of a series of steady-state snapshots, and for each snapshot an acoustic load is imposed to a static steady-state TPS structure. A multistep thermal-acoustic fatigue damage intensity analysis procedure is given and consists of a heat transfer analysis, a nonlinear thermoelastic analysis, and a random response analysis under a combined loading environment and the fatigue damage intensity has been evaluated with two fatigue analysis techniques. The effects of thermally induced deterministic stress and nondeterministic dynamic stress due to the acoustic loading have been considered in the damage intensity estimation with a maximum stress fatigue model. The results show that the given thermal-acoustic fatigue intensity estimation procedure is a viable approach for life prediction of TPS structures under a typical mission cycle with combined loadings characterized by largely different time-scales. A discussion of the effects of the thermal load, the acoustic load, and fatigue analysis methodology on the fatigue damage intensity has been provided.

Sign in / Sign up

Export Citation Format

Share Document