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Effect of Ther.al Fatigue Loading on Tensile Behavior.of H13 Die Steel with Biomimetic Sur.ace

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Jour.al of bionic engineering 2010年第4期7卷 390-396页

作者： Zhihui Zhang~1,luquan ren~1,Hong Zhou~2,zhiwu han~1,Xin Tong~3,Yu Zhao~1,Li Chen~1 1.key laboratory of bionic engineering (Ministr. of Education,china),jilin university,changchun 13.022,p.r.china 2.key laboratory of Automobile Mater.als (Ministr. of Education,china),jilin university,changchun 13.022,p.r.china 3.The Dep.r.ment of Mater.als Sur.ace engineering,Guangzhou r.sear.h Institute of Non-Fer.ous Metals,Guangzhou 510651,p.r.china [a] key laboratory of bionic engineering (Ministr. of Education China) Jilin University Changchun 130022 P. R. China [b] Key Laboratory of Automobile Materials (Ministry of Education China) Jilin University Changchun 130022 P. R. China [c] The Department of Materials Surface Engineering Guangzhou Research Institute of Non-Ferrous Metals Guangzhou 510651 P. R. China

Biomimetic sur.ace is an effective ways to p.omote the p.r.or.ance gr.de and ap.lied r.nge of mater.als without alter.ngtheir.*** imp.oved p.op.r.ies such as r.sisting fatigue,endur.ng wear.etc,have been achieved by ap.lyingbiomimetic mor.0}ology or.str.ctur. to some engineering mater.al *** this p.p.r.aiming to r.veal the r.lationship.etween ther.al cr.cking behavior.and mechanical p.op.r.ies of engineering mater.als with biomimetic sur.ace,biomimeticsp.cimens wer. fabr.cated using laser.technique by imitating the heter.geneous str.ctur. on the sur.ace of p.ant *** of ther.al fatigue cycling on the tensile p.op.r.ies of H13 die steel sp.cimens with different sur.aces (sever.l typ.s ofbiomimetic sur.aces and a smooth sur.ace) was comp.r.d and *** a r.sult,due to the coup.ing effects of themor.0}ological featur.s on the sur.ace and the micr.str.ctur. char.cter.stics within unit zone,these sp.cimens with biomimeticsur.ace exhibit r.mar.ably enhanced Ultimate Tensile Strength (UTS) and 0.2% Yield Strength (YS) comp.r.d with r.ferencesp.cimens while cor.esp.nding ductility r.mains lar.ely unaffected even heightened,whether.the ther.al fatigue loads or.*** r.lative mechanisms leading to these imp.ovements have been discussed.

关键词： biomimetic sur.ace coup.ing ther.al fatigue tensile p.op.r.y H13 steel

Design p.incip.es of the Non-smooth Sur.ace of bionic p.ow Moldboar.

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Jour.al of bionic engineering 2004年第1期1卷 9-19页

作者： luquan ren, Shiqiao Deng, Jingchun wang, zhiwu han key laboratory of Ter.ain-Machine bionics engineering (Ministr. of Education,china), jilin university at Nanling Camp.s, changchun 13.022,p.r. china jilin university at Nanling Camp.s jilin university at Nanling Camp.s jilin university at Nanling Camp.s jilin university at Nanling Camp.s

The diver.e non-smooth body sur.aces to r.duce soil adhesion ar. the evolutional r.sults for.the soil animals to fit the adhesive and wet envir.nment and can be used as a biological basis for.the design of bionic p.ow moldboar.. The model sur.aces for.bionic simulation should be taken fr.m soil animal digging or.ans, on which the soil motion is similar.to what is on the sur.ace of moldboar.. By analyzing the distr.bution of non-smooth units on the body sur.ace of the gr.und beetle jaw and the soil moving str.sses, the design p.incip.es of the bionic moldboar. for.the local and the whole moldboar. wer. p.esented r.sp.ctively. As well, the effect of soil moving sp.ed on r.ducing adhesion, the dimensions r.lationship.between soil p.r.icles and non-smooth convexes, the r.lationship.between the envelop.ng sur.ace of non-smooth convexes and the initial smooth sur.ace of the p.ow body, and the convex typ.s of the sp.er. cor.nal and the p.ngolin scales,*** discussed.

关键词： bionics p.ow moldboar. non-smooth sur.ace design p.incip.e

Numer.cal Modelling of Electr.osmotic Dr.ven Flow in Nanop.r.us Media by Lattice Boltzmann Method

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Jour.al of bionic engineering 2013年第1期10卷 90-99页

作者： Bo Li Wenning Zhou Yuying yan zhiwu han luquan ren Ener.y and Sustainability r.sear.h Division Faculty of Engineering University of Nottingham Nottingham NG7 2RD UK key laboratory of bionic engineering (Ministr. of Education China) Jilin University Changchun 130022 P. R. China

The lattice Boltzmann method was emp.oyed to simulate electr.osmotic dr.ven flow and Debye layer.scr.ening in con- ducting electr.lyte ar.und a p.r.us str.ctur. with aver.ge size of 40 nm. The char.e scr.ening ar.und the nanop.r.s was investigated by solving the vector.sup.r.0}sitioned p.tential equilibr.um distr.bution function and adding electr.-kinetic for.e ter. to the evolution equation. In this inter.ediate case of moder.te Debye length, the electr.p.or.sis p.oblem becomes comp.icated. The motion of the p.r.icles distor.s the scr.ening cloud, which becomes asymmetr.c, r.sulting in ver. comp.ex inter.ctions between the electr.lyte, the scr.ening cloud and the p.r.icle; but the Electr.osmotic Flow （EOF） behaviour.was still consider.d based on the Helmoholtz-Smoluchowski model with adap.ation to fit nanop.r.us flow in the p.r.us str.ctur.. In the p.esent ap.r.ach, the flow in the nanop.r.s is dir.ctly modelled; the detailed flow infor.ation can be obtained by simp.ifying the r.p.ated macr.str.ctur.. Due to the symmetr. of the domain, the size of comp.tational domain can be lar.ely r.duced by less r.p.ated sp.er.cal nanop.r.icles. Each p.r. of the medium contains sever.l lattice nodes on the simp.ified cur.ed edges and p.tential gr.dients ar. p.oduced by adjusting the zeta p.tential value. The velocity r.sults for.p.essur.-dr.ven and EOF flows agr.e well with the analytical solutions and r.cent exp.r.mental r.sults. In p.r.icular. the inter.ace between solid p.r.icles and fluids, the influences of p.r.sity, solid p.r.icle diameter. yield str.ss and electr.c p.r.meter. in EOF wer. investigated. The anti-adhesion effect of electr.osmotic p.mp.ng effect was evaluated, and the p.lsed DC was ap.lied in or.er.to enhance the p.r.or.ance of the electr.osmotic p.mp.ng. The r.sults demonstr.te that the p.esent lattice Boltzmann model is cap.ble of modelling flow thr.ugh nanop.r.us media at cer.ain r.str.ctions while some r.sults deviate fr.m the p.edictions based on the macr

关键词： electr.osmotic flow electr.osmotic p.mp.ng nanop.r.us media lattice Boltzmann method numer.cal modelling,anti-adhesion

Light Tr.p.ing Effect in Wing Scales of Butter.ly p.p.lio p.r.nthus and Its Simulations

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Jour.al of bionic engineering 2013年第2期10卷 162-169页

作者： zhiwu han Shichao Niu Lufeng Zhang Zhenning liu luquan ren key laboratory of bionic engineering (Ministr. of Education China) Jilin University Changchun 130022 P. R. China

Br.adband light tr.p.ing effect and ar.ays of sub-wavelength textur.d str.ctur.s based on the butter.ly wing scales ar. ap.licable to solar.cells and stealth technologies. In this p.p.r. the fine op.ical str.ctur.s in wing scales of butter.ly p.p.lio p.r.nthus, exhibiting efficient light tr.p.ing effect, wer. car.fully examined. Fir.t, the r.flectivity was measur.d by r.flectance sp.ctr.m. Field Emission Scanning Electr.nic Micr.scop. （FESEM） and Tr.nsmission Electr.n Micr.scop. （TEM） wer. used to obser.e the coup.ing mor.0}ologies and str.ctur.s of the scales. Then, the op.imized 3D model of the coup.ing str.ctur. was cr.ated combining Scanning Electr.n Micr.scop. （SEM） and TEM data. After.ar.s, the mechanism of the light tr.p.ing effect of these str.ctur.s was analyzed by simulation and theor.tical calculations. A multilayer.nano-str.ctur. of chitin and air.was found. These str.ctur.s ar. effective in incr.asing op.ical p.th, r.sulting in that most of the incident light can be tr.p.ed and adsor.ed within the str.ctur. at last. Fur.her.or., the simulated op.ical r.sults ar. consistent with the exp.r.mental and calculated ones. This r.sult r.liably confir.s that these str.ctur.s induce an efficient light tr.p.ing effect. This wor. can be used as a r.ference for.in-dep.h study on the fabr.cation of highly efficient bionic op.ical devices, such as solar.cells, p.oto detector., high-contr.st, antiglar., and so for.h.

关键词： butter.ly wing scale light tr.p.ing str.ctur.s biomimetic functional sur.aces

Er.sion-r.sistant Sur.aces Insp.r.d by Tamar.sk

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Jour.al of bionic engineering 2013年第4期10卷 479-487页

作者： zhiwu han Wei Yin Junqiu Zhang Jialian Jiang Shichao Niu luquan ren key laboratory of bionic engineering (Ministr. of Education China) Jilin University Changchun 130022 P. R. China

Tamar.sk, a p.ant that thr.ves in ar.d and semi-ar.d r.gions, has adap.ed to bluster. conditions by evolving extr.mely ef- fective and r.bust anti-er.sion sur.ace p.tter.s. However. the details of these unique p.op.r.ies and their.str.ctur.l basis ar. still unexp.or.d. In this p.p.r. we demonstr.te that the tamar.sk sur.ace only suffer. minor.scr.tches under.wind-sand mixtur. er.sion. The r.sults show that the anti-er.sion p.op.r.y of bionic samp.e, insp.r.d by tamar.sk sur.ace with different sur.ace mor.0}ologies, can be attr.buted to the flow r.tating in the gr.oves that r.duces the p.r.icle imp.ct sp.ed. Fur.her.or., the simulation and exp.r.ment on the er.sion wear.behavior.of the bionic samp.es and bionic centr.fugal fan blades show that the bionic sur.ace with V-typ. gr.ove exhibits the best er.sion r.sistance. The bionic sur.ace on centr.fugal fan blades with op.i- mum p.r.meter. can effectively imp.ove anti-er.sion p.op.r.y by 28.97%. This p.p.r.show mor. op.or.unities for.bionic ap.lication in imp.oving the anti-er.sion p.r.or.ance of moving p.r.s that wor. under.dir. and sand p.r.icle envir.nment, such as helicop.er.r.tor.blades, air.0}ane p.op.ller., r.cket motor.nozzles, and p.p.s that r.gular.y wear.out fr.m er.sion.

关键词： tamar.sk anti-er.sion numer.cal simulation bionic centr.fugal fan blades

Biominer.lization of Calcium Car.onate for.Contr.lling Cr.stal Str.ctur. and Mor.0}ology via the Har. Temp.ate

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Biomineralization of Calcium Carbonate for Controlling Cryst...

Exp.r.mental investigation on anti-wear.p.op.r.ies of laser.textur.ng gear.with bionics sur.ace

The 3r. Inter.ational Conference of bionic engineering(ICBE’10)

作者： Tianhua Chen1 2 zhiwu han1 1 key laboratory of bionic engineering (jilin university) Ministr. of Education p.r.china 2 Mechanical engineering Academy changchun university changchun 13.022 china

Based on the basic p.incip.es of biominer.lization, ar.gonite/vater.te calcium car.onate （CaCO3） mater.al with a sp.cific mor.0}ology wer. synthesized by biomimetic method under.ambient *** our.exp.r.ments,the Au, Si substr.te wer. used as the temp.ate. The obtained comp.site CaCO3 wer. char.cter.zed by using X-r.y p.wder.diffr.ction （Xr.） analysis and scanning electr.n micr.scop. （SEM） and Four.er.tr.nsfor. infr.r.d sp.ctr.scop. （FTIr. measur.ment. The r.sults showed that the har. temp.ates can also influence the p.lymor.0}ism and mor.0}ology of cr.stals as the soft temp.ates. When the CaCO3 induced by the Si substr.te, the ar.gonite p.lymor.0} for.s;while induced by the Au substr.te, vater.te cr.stals ar. obtained. At the same time,the p.ssible mechanism of inter.ction between substr.te and CaCO3 dur.ng the CaCO3 for.ation p.ocess was *** Si substr.te, as negative temp.ate, the electr.static inter.ction is main factor.r.sp.nsible for.the contr.lled cr.stallization of CaCO3 on temp.ate. For.Au substr.te, the lattice matching factor.p.ays gr.at r.le in the cr.stallized vater.te cr.stal.

关键词： Biominer.lization Calcium Car.onate p.lymor.0} har. temp.ate

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Experimental investigation on anti-wear properties of laser ...

Lar.e Cur.atur. Folding Str.tegies of Butter.ly p.oboscis

The Inter.ational Conference of bionic engineering(ICBE’06)

作者： Dong lichun han zhiwu Cui Zhanr.ng ren luquan key laboratory for.Ter.ain-Machine bionics engineering Ministr. of Education Jinlin university changchun 13.022 p.r.china

＜正＞In or.er.to imp.ove the fatigue strength and ser.ice lives of gear.laser.textur.ng exp.r.mental method was adop.ed,com- bining a typ. of bionics thought of non-smooth sur.ace,to make micr.-str.ctur.l mesh on the gear.sur.ace.A coup.e laser.tex- tur.ng gear. wer. fixed on gear.testing device to test their.wear.and ser.ice lives,comp.r.ng with a coup.e initial untr.ated smooth gear.. An ap.r.p.iative measur.ng instr.ment for.testing gear.configur.tion and p.r.meter. was emp.oyed to examine main p.- r.meter.,such as dentifor. er.or.gear.dir.ction er.or.of coup.e gear.befor. and after.the wear.exp.r.ments under.comp.ete lu- br.cation condition,*** was found fr.m the exp.r.ments that the dentifor. er.or.and gear.dir.ction er.or.of laser.textur.ng gear.after.the exp.r.ments wer. decr.asing mostly,but the two same typ. er.or. of the smooth coup.e gear. wer. in- cr.asing and ap.ear.ng negative value,which p.oved that the smooth coup.e gear. wor. away mor. ser.ously,and the coup.e gear. with laser.textur.ng bionics non-smooth sur.ace wer. wear.ble r.latively.

关键词： fatigue strength ser.ice lives laser.textur.ng bionics sur.ace dentifor. er.or gear.dir.ction er.or

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Jour.al of bionic engineering 2020年第6期17卷 1239-1250页

作者： Daobing Chen Honglie Song Qingp.ng liu Jie Gan yang liu keyu Che' Chong wang Shifeng Wen yan Zhou Chunze yan Junqiu Zhang Yusheng Shi zhiwu han State key laboratory of Mater.al p.ocessing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China The key laboratory of bionic engineering(Ministr. of Education) Jilin UniversityChangchun 130022China Ap.lied Mechanics laboratory Deparment of Engineering MechanicsTsinghua UniversityBeijing 100083China Faculty of engineering China University of GeosciencesWuhan 430074China

Due to its r.al-time contr.l,high folding r.tio,and str.ctur. self-locking,flexible lar.e cur.atur. self-folding devices have br.ad ap.lication p.osp.cts,such as foldable human imp.ants,flexible electr.nics,and flexible *** by this backgr.und,flexible lar.e cur.atur. folding butter.ly(p.lyur. eudamip.us)p.oboscises wer. studied in this *** folding r.tio of the p.oboscises was about *** cur.atur. of coiled p.oboscises r.nged fr.m about 150 m_1 to 880 m The exter.al and inter.al str.ctur.s of the p.oboscises wer. studied by different *** main str.tegies for.lar.e-cur.atur. folding of p.oboscises wer. identified:a gr.dual decr.ase in thickness,a lower.elastic modulus,and(most imp.r.antly)lar.e number. of r.gular.cor.ugated cr.cks ar.anged on the *** cor.ugated cr.cks can effectively accommodate the coiled str.in and p.ovide sp.ce for.the lar.e cur.atur. folding of ***,a 4D p.inted coiled samp.e with cor.ugated cr.cks was fabr.cated to mimic the p.oboscises str.tching ***-cur.atur. folding str.tegies,based on these p.oboscises,p.ovide insights for.the biomimetic design of ar.ificial highly folded comp.nents.

关键词： butter.ly p.oboscis lar.e cur.atur. folding cor.ugated cr.ck 4D p.inting bionic