TY  - EJOU
AU  - Yang, Zhengmao 
AU  - Yang, Junjie 
AU  - Chen, Yang 
AU  - Jing, Fulei 

TI  - Multiscale	Modeling	for	Thermomenchanical	Fatigue	Damage	Analysis	 and	Life	Prediction	for	Woven	Ceramic	Matrix	Composites	at	Elevated	 Temperature
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 26
IS  - 4
SN  - 1933-2815

AB  - Woven	 ceramic	 matrix	 composites	 (CMCs),	 exhibiting	 excellent	 thermomechanical	 properties	 at	 high	
temperatures,	are	promising	as	alternative	materials	to	the	conventional	nickel-based	superalloys	in	the	hot	
section	components	of	aero-engines.	Therefore,	understanding	and	predicting	the	lifetime	of	CMCs	is	critical.	
Fatigue	prediction	of	woven	CMCs	currently	involves	long-term	and	costly	testing.	A	feasible	alternative	is	
to	use	predictive	modelling	based	on	a	deep	understanding	of	the	damage	mechanisms.	Therefore,	this	study	
develops	a	multiscale	analysis	modelling	method	 for	 predicting	 the	 fatigue	life	 of	CMC	materials	at	 high	
temperature	 by	 investigating	 the	 thermomechanical	 fatigue damage	 evolution.	 To	 represent	 the	 global	
thermomechanical	 properties	 of	 a	 composite	 structure,	 a	 repeat	 unit	 cell	 (RUC)	 of	woven	 composites	is	
proposed.	The	RUC	integrates	a	micromechanics	model	and	a	shear-lag	model	with	a	statistical	model	to	
predict	the	damage	evolution	and	fatigue	life	of	the	composite	structures.	The	present	methodology	defines	
global	structure	failure	as	the	degradation	of	thermomechanical	properties	of	the	RUC	caused	by	constituent	
failures	and	nonlinear	material	properties	in	the	RUC.	The	elastic	modulus	evolution	is	used	to	determine	
material	 failure,	 which	 can	 affect	 the	 thermomechanical	 properties	 of	 the	 RUC.	 The	 methodology	 is	
evaluated	 using	 the	experimental	 test	 performed	 on	woven	SiC/SiC	 CMC	with	an	environmental	 barrier	
coating.
KW  - 

DO  - 10.32604/icces.2023.09229