TY  - EJOU
AU  - Wu, Peidong 

TI  - Effects	of	Pre-straining	on	Material	Anisotropy	in	Sheet	Metals
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 26
IS  - 1
SN  - 1933-2815

AB  - The	material	anisotropy	of	an	aluminum	sheet	alloy	is	determined	by	performing	tensile	tests	at	different	
angles	with	respect	 to	 the	rolling	direction	 (RD).	To	study	 the	effect	of	pre-straining	on	 the	evolution	of	
material	anisotropy,	a	very	wide	sheet	is	stretched	to	different	strains	in	the	transverse	direction	(TD).	The	
material	in	the	central	region	is	very	close	to	a	state	of	in-plane	plane	strain	tension.	Small	tensile	samples
are	cut	from	the	central	region	of	the	pre-strained	wide	sample.	Tensile	tests	are	then	performed	on	these	
small	tensile	samples.	By	comparing	the	differences	in	the	flow	stress	vs.	orientation	curves	between	the	asreceived	 and	 pre-strained	 sheets,	 the	 effect	 of	 pre-straining	 on	 material	 anisotropy	 is	 studied.	 Some	
surprising	results	are	observed	and	emphasized.		Based	on	both	the	experimental	and	numerical	studies,	it	
is	suggested	that	the	conventional	methodology	for	determining	material	anisotropy	would	overestimate	
the	pre-straining	effect	and	would	result	in	a	completely	erroneous	yield	surface.
KW  - Anisotropy;	mechanical	test;	crystal	plasticity;	yield	function

DO  - 10.32604/icces.2023.010491