@Article{icces.2023.09028,
AUTHOR = {Kaijin Wu, Yong Ni},
TITLE = {Multiscale	Structural	Design	and	Fracture	Control	of	High-Performance	 Biomimetic	Materials},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {26},
YEAR = {2023},
NUMBER = {3},
PAGES = {1--2},
URL = {http://www.techscience.com/icces/v26n3/54047},
ISSN = {1933-2815},
ABSTRACT = {Bioinspired	architectural	design	for	composites	with	much	higher	impact-resistance	and	fracture-resistance	
than	that	of	individual	constituent	remains	a	major	challenge	for	engineers	and	scientists.	Inspired	by	the	
survival	 war	 between	 the	 mantis	 shrimps	 and	 abalones, we	 develop	 multiscale	 mechanical methods	 to	
design	 structures	and	 control	 fractures	in	 high-performance	biomimetic	materials.	The	first	 point	is	the	
optimization	design	of	impact-resistant	nacre-like	materials [1-4].	By	a	combination	of	simulation,	additive	
manufacturing,	 and	 drop	 tower testing	 we revealed that,	 at	 a	 critical	 interfacial	 strength	 or	 a	 critical	
prestress,	the	competition	between	intralayer	cracks and	interlayer	delamination,	or	the	synergistic	effect
between	 the	 prestress-enhanced	 tablets	 sliding	 and	 prestress-weakened structural	 integrality,	 result	 in	
optimized	impact	resistance	of	nacre-like structures. Furthermore,	the	interfacial	strength design	and	the	
prestressing	 strategy	 were easily	 implemented	 to	 a designed	 nacre-inspired	 separator	 to	 enhance	 the	
impact	 resistance	 of	 lithium batteries. Later,	 we	 designed a	 discontinuous	 fibrous	 Bouligand	 (DFB)	
architecture [5],	whose	fracture-energy	dissipations	are	insensitive	to	initial	crack-orientations	and	show	
optimized	 values	 at	 critical	 pitch	 angles.	 Fracture	 mechanics	 analyses	 demonstrate	 that	 the	 hybrid	
toughening	mechanisms	of	crack	twisting	and	crack	bridging	mode	arising	 from	DFB	architecture	enable	
excellent	fracture-resistance	with	crack-orientation	insensitivity.	The	compromise	in	competition	of	energy	
dissipations	 between	 crack	 twisting	 and	 crack	 bridging	 is	 identified	 as	 the	 origin	 of	 maximum	 fracture	
energy	at	a	critical	pitch	angle.	We	further	illustrate	that	the	optimized	fracture	energy	can	be	achieved	by	
tuning	 fracture	energy	 of	crack	bridging,	pitch	angles,	 fiber	lengths	and	 twist	angles	distribution	in	DFB	
composites.	Our	findings	shed	light	on	how	nature	have	evolved	materials	to	exceptional	impact	resistance	
and	 fracture	 toughness,	 and provide	 the	 generic	 design	 strategies	 for	 bioinspired	 formidable impactresistant	and fracture-resistant materials.},
DOI = {10.32604/icces.2023.09028}
}