TY  - EJOU
AU  - Cao, Minghua 
AU  - Baxevanakis, Konstantinos P. 
AU  - Silberschmidt, Vadim V. 

TI  - 3D	Analysis	of	Effect	of	Graphite	Morphology	on	Thermomechanical	 Behaviour of	CGI
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 26
IS  - 3
SN  - 1933-2815

AB  - Compacted	graphite	iron	(CGI)	was attractive	as	an important	material	for	the	industry	since its	introduction	
in	the	last	century.	Thanks	to	its	high	strength,	great	wear	resistance	and	thermal	conductivity,	CGI	became
extensively	applied	in the automotive	industry	as	engine	parts:	brake	drums,	cylinder	heads	and	exhaust	
manifolds. As	a	metal-matrix	composite,	CGI	contains	two	microstructural	phases:	graphite	inclusions	and	a	
metallic	 matrix.	 The	 main	 fracture	 mechanism	 of	 CGI	 under	 high-temperature	 service	 conditions	 at	
macroscale	 is	 linked	 to graphite-matrix (interfacial) debonding,	 formation	 of	 microcracks and	 their	
networks, and	final	failure of	the	material	at	microscale because	of	the	mismatch	in	coefficients	of	thermal	
expansion	of	these phases. This	graphite-matrix	debonding phenomenon	was studied	in	various	research	
works	 with	 regard	to	 mechanical	 or	 thermal	 loads for	 various	 compositions	 but	 is	 still	 required	 to	 be	
investigated	for	CGI	with	its	complex	microstructure [1,2]. To	study	the	effect	of	graphite	morphology	on	
thermomechanical	 behaviours	 of	 CGI,	 a set	 of	 three-dimensional	 numerical	 models of unit	 cells	 was	
generated.	 Each	 unit	 cell includes metallic	 matrix containing	 a	 single	 graphite	 inclusion with	 complex	
morphology. In	 finite-element	analysis,	elastoplastic	behaviour was	applied	to	both	phases.	Pure	thermal	
loads	were	considered	in	numerical	simulations	focusing	on	 the	thermomechanical	response	of	CGI.	The	
obtained	results provide a	fair	correlation	between	microstructure	and	thermomechanical	behaviour	of	CGI	
under	high	temperatures.
KW  - Compacted	graphite	iron;	thermal	load;	fracture	mechanism;	numerical	simulation

DO  - 10.32604/icces.2023.09086