TY  - EJOU
AU  - Luo, Shichao 
AU  - Cui, Yinan 

TI  - Investigating	the	Self-Force and	Evolution of	High-Speed	Dislocations	in	 Impacted	Metals:	A	Discrete-Continuous	Model	and	Configurational	 Mechanics	Analysis
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 25
IS  - 3
SN  - 1933-2815

AB  - The	responses	of	metals	subjected	to	super	high	rates	of	deformation	(> 10!/�),	as	shocking	loading,	is	an	
area	of	active	research.	At	such	extreme	loading	rates,	subsonic,	transonic,	and	even	supersonic	dislocation	
(compared	with	the	shear	wave	speed	in	metals)	play	a	crucial	role	in	plastic	deformation.	The	behavior	of	
high-speed dislocations	is	much	more	complex	than	that	of	quasi-static	dislocations	under	static	loads,	as	
their	 self-force	 is	 history-dependent,	 and	 their	 evolution	 of	 density	 is	 rate-relevant. However,	 the	
fundamental	 questions	 regarding	 the	 self-force	 and evolution	 of	 high-speed	 dislocations in	 impacted	
materials	is	largely	unknown. To	address	this	gap,	this	study	proposes	an	effective	calculation	method	for	
self-force	on	high-speed	dislocations	based	on	the	discrete-continuous	model	(DCM)	of	three-dimensional	
dislocation	elastodynamics	(3-DDE)	and	the	dynamic	J-integral	of	configurational	mechanics. This	method	
is	applicable	to	subsonic,	transonic,	and	supersonic	dislocations	in	both	isotropic	and	anisotropic	media,	and	
it	can	automatically	consider	the	image	force	if	the	dislocation	is	close	to	the	free	surface.	The	effectiveness	
of	the	method	is	verified	by	comparing	it	with	existing	theoretical	solutions	and	molecular	dynamics	results.	
The	work investigates	how	crystal	anisotropy,	complicated	motion	history,	and free	surface	influence	the	
self-force	of	high-speed	dislocations. Additionally,	the	study	examines	how	dislocation	evolves at	high-speed
changes under shock	 wave.	 The	 elastic	 precursor	 decay	 is	 analyzed	 considering	 the	 dislocation	
elastodyanmics	effect.
KW  - Shock	waves
KW  - 	high-speed	dislocation
KW  - 	dislocation	evolution
KW  - 	crystals	anisotropy
KW  - 	self-force

DO  - 10.32604/icces.2023.010223