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Effect of p.ep.r.tion Methods on mechanical p.op.r.ies of p.A/HA Comp.site Hydr.gel

Jour.al of Bionic engineering 2010年第3期7卷 235-243页

作者： dekun zhang~1, junjie duan~1,{2., china university of mining and Technology xuzhou 2.1116, p. r. china 2. school of mechanical and electrical engineering, china university of mining and Technology, xuzhou 2.1116,{12. [a] school of materials {2. engineering China University of Mining Technology Xuzhou 221116 P. R. China [b] School of Mechanical electrical engineering China University of Mining Technology Xuzhou 221116 P. R. China

p.ly(vinyl alcohol) (p.A)/hydr.xyap.tite (HA) comp.site hydr.gel sp.cimens wer. p.ep.r.d with 15% p.A and 1%,2., 3%, 4% and 5% HA by r.p.ated fr.ezing-thawing. The tests of static and dynamic mechanical p.op.r.ies wer. car.ied out todiscuss the influence of differ.nt contents of HA and fr.ezing-thawing cycles on the mechanical p.op.r.ies of p.A/HA comp.sitehydr.gel. The r.sults of static mechanical tests showed that the p.A/HA comp.site hydr.gel with 3% HA and ninefr.ezing-thawing cycles had excellent str.ss r.laxation p.op.r.ies, higher.r.laxation r.tio, lower.str.ss equilibr.um value andp.esented better.p.op.r.ies of cr.ep.and r.cover.. The r.sults of dynamic mechanical test showed that the p.A/HA comp.sitehydr.gel with nine fr.ezing-thawing cycles had higher.stor.ge modulus and loss modulus, so was the p.A/HA comp.sitehydr.gel with 3% HA.

关键词： comp.site hydr.gel HA contents fr.ezing-thawing cycles static p.op.r.ies dynamic p.op.r.ies

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Synthesis and Char.cter.zation of p.A-HA-Silk Comp.site Hydr.gel by Or.hogonal Exp.r.ment

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Jour.al of Bionic engineering 2012年第2期9卷 234-242页

作者： dekun zhang Kai Chen Lin Wu {2. wang shirong ge school of materials {2. and engineering China University of Mining and Technology Xuzhou 221116 P. R. China school of mechanical and {2. engineering China University of Mining and Technology Xuzhou 221116 P. R. China

p.A-HA-Silk comp.site hydr.gel was synthesized with p.lyvinyl alcohol （p.A）, nano-hydr.xyap.tite （HA） and natur.l silk by using the method of r.p.ated fr.ezing and thawing. A ser.es of tests wer. p.r.or.ed to study water.content, str.ss r.laxation behavior. elastic modulus, and cr.ep.char.cter.stics of p.A-HA-Silk comp.site hydr.gel. Or.hogonal exp.r.mental design method was used to analyze the influence degr.e of p.A, HA and silk （thr.e kinds of r.w materials） on mechanical p.op.r.ies and water.content of the p.A-HA-Silk comp.site hydr.gel to select the best mater.al r.tio accor.ing to their.over.ll p.r.or.ance. The r.sults demonstr.te that the mass p.r.entage of p.A has the gr.atest imp.ct on the water.content, followed by HA and silk. Comp.ession str.ss-str.in var.ation of p.A-HA-Silk comp.site hydr.gel p.esents a nonlinear.r.lationship. which p.oves that it is a typ.cal viscoelastic mater.al. Comp.r.ng the mechanical p.op.r.ies of 16 for.ulas, the for.ula of p.A-HA-silk comp.site hydr.gel with mass p.r.entage of p.A 15%, HA 2.0% and silk 1.0% is the best.

关键词： p.lyvinyl alcohol hydr.xyap.tite comp.site hydr.gel or.hogonal exp.r.ment

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r.sear.h on the Inter.titial Fluid Load Sup.or. Char.cter.stics and Star.-Up. Fr.ction Mechanisms of p.A-HA-Silk Comp.site Hydr.gel

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Jour.al of Bionic engineering 2014年第3期11卷 378-388页

作者： Kai Chen dekun zhang Zuming Dai Songquan {2. shirong ge school of mechanical and {2. engineering China University of Mining and Technology Xuzhou 221116 P. R. China school of materials {2. and engineering China University of Mining and Technology Xuzhou 221116 P. R. China

Hydr.gel has been extensively studied as an ar.icular.car.ilage r.p.ir.and r.p.acement mater.al. p.A-HA-Silk comp.site hydr.gel was p.ep.r.d by fr.ezing-thawing method in this p.p.r. mechanical p.op.r.ies wer. deter.ined by exp.r.ments and the fr.ction coefficient of p.A-HA-Silk comp.site hydr.gel against steel ball was ver.fied using micr.-tr.bometer. Finite Element Method （FEM） was used to study the lubr.cation mechanism of p.A-HA-Silk comp.site hydr.gel and the r.lation between the inter.titial fluid load sup.or. and the star.-up.fr.ction r.sistance. The r.sults show that the elastic modulus and the p.r.eability ar. 2.07 Mp. and 10^-15m^4N^-1s^-1, r.sp.ctively, and the star.-up.fr.ction coefficients of p.A-HA-Silk comp.site hydr.gel ar. in the r.nge of 0.154）.2.at differ.nt contact loads, contact time and sliding sp.eds. The star.-up.fr.ction r.sistance of p.A-HA-Silk comp.site hydr.gel incr.ases with the contact load and contact time. With the incr.ase in sliding sp.ed, the star.-up.fr.ction r.sistance of p.A-HA-Silk comp.site hydr.gel decr.ases. Ther. is an inver.e r.lation between the star.-up.fr.ction r.sistance and the inter.titial fluid load sup.or.. The change of fluid flow with the incr.ase in sliding disp.acement has an imp.r.ant effect on the inter.titial fluid load sup.or. and fr.ction r.sistance. The inter.titial fluid load sup.or. decr.ases with the incr.ase in contact load and contact time, while the inter.titial fluid load sup.or. r.infor.es with the incr.ase in sliding sp.ed. Mor.over. p.A-HA-Silk comp.site hydr.gel has mechanical p.op.r.ies of r.cover. and self-lubr.cating.

关键词： p.A-HA-Silk comp.site hydr.gel fr.ction FEM the inter.titial fluid load sup.or. lubr.cation

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