层间韧化的碳纤维复合材料层压板的力学性能

1、224Vol.22No.4 20088CHINESE JOURNAL OF MATERIALS RESEARCH August200812331.1000952.1000743.310013I II,.,/33,.,TB3321005-3093(200804-0337-10 Interlaminar toughness and characteristic morphology oflaminated graphite composites interlaminartoughened YI Xiaosu1XU Yahong2CHENG Qunfeng3FANG Zhengping31.Nati

2、onal Key Laboratory of Advanced Composites,Beijing Institute of Aeronautical Materials,Beijing1000952.Research Institute of Aerospace Special Materials&Technology,Beijing1000743.Department of Polymers Science&Engineering,Zhejiang University,Hangzhou310013*Supported by National Key Basic Rese

3、arch and Development Program of China No.2003CB615604,Na-tional Natural Science Foundation of China No.10590356,and National HighTech Research and Develop-ment Program of China No.2007AA03Z541.Manuscript received February2,2008;in revised form March5,2008.*To whom correspondence should be addressed,

4、Tel:(01062496740,Email:xiaosu.yi ABSTRACT The interlaminar toughness like G IC and G IIC of BMI based composite laminates Exsitu toughened was studied as well as the interlaminar microstructure and morphology,impact damage resistance,compression strength after impact,and the typical inplan and outpl

5、an mechanical properties.Based on the Exsitu toughening concept,it is found that a thermoplastic/thermosetting cocontinuous phase is formed by the reactioninduced spinodal phase separation,followed by phase inversion and coarsen-ing in the interlaminar region of composite laminate,which dramatically

6、 improves the interlaminar fracture toughness,impact damage resistance and compression strength after impact.KEY WORDS composites,bismaleimide,interlaminar toughness,phase morphology,impact damage, mechanical properties,(Resin transfer molding,RTM, ,.F2245%(360*(2003CB615604,(10590356(2007 AA03Z541.

7、 200822.200835.:,RTM1.RTMF220.5%,5%,40%,10%. RTM.,(55%.,.,.RTM33822 .,RTM.,2,3.,;, .,RTM.,Cytec,4.,.,(Bis-maleimide,BMI,.(Exsitu511,.12.(Bismaleimide,BMI,RTM13.1(BMI 6421(,1,(PAEK14,15.3K T700 (TORAYG827(HEXCEL ,(160±7g/m2.RTM,RTM1.,(2.2,BMI,12PAEK.1(BMI6421Table1Typical mechanical properties o

8、f BMI6421Physical property BMI6421Tensile strength/MPa67.6Tensile modulus/GPa 2.28Elongation at break/% 1.88Flexural strength/MPa119.5Flexural modulus/GPa 4.12Impact toughness/(kJ/m2 14.31Fig.1Temperaturetime program for the RTM process and curing of the BMI,ES Tm,16., I(HB74021996,G IC,0(DCB;II(HB7

9、4031996G IIC,0(ENF.,.2C V=(/×100%,.(Leica DMRM/E(SEM,Hitachi S3000N., SEM,THF.:,98h,1h, 60.BMS7260,150mm×100mm×4:339 2I(G ICII(G IICTable2Feature and the interlaminar fracture toughness(G IC and G IICof the BMI based laminates in comparisonSampleNo.Toughening concept G IC(J/m2/C v(%G

10、IIC(J/m2/C v(% 1Neat BMI,nontoughened215/11.6510/2.75Concept1,Toughened with216.8%(mass fractionPAEK453/9.13971/3.26Concept2,Toughened with320.2%(mass fractionPAEK627/3.19905/5.373G827/BMITable3The mechanical properties test of G827/BMI compositesMechanical property Layup Specimen size/mm Test stand

11、ard Testing machine0Tensile strength/MPa012230×15GB/T335419990o Tensile modulus/GPaPoisson ratio0Compression strength/MPa012140×6GB/T38562005MTS88050KN,0Compression modulus/GPa MTS Corp.USA Flexural strength/MPa01275×12.5GB/T33562005Flexural modulus/GPaInterlaminar shear strength/MPa0

12、1220×6GB/T335720054mm,+45/0/45/904S, 4.45J/mm.C,.(GB/T3856200I2,I(A,(Aa,PAEK(Ac,PAEK,PAEK.(2B,(2B(a,( 2B(b,B(c,.(2C.(2C(a,;,(Reactioninduced spinodal phase separation17BMI(2C(bC(c,PAEK.,BMI(2C(a.,BMI(2C(bC(c.,PAEK.PAEK, BMI.,(2D(aE(aD(bE(bBMIBMIPAEK,.,234022BMI(C(bC(c(C(bD(aE(a, C(cD(bE

13、(b., PAEK(E(aE(b,.,BMI.,PAEK BMI, PAEK BMI., 1:Non-toughened2:Toughened with16.8%3:Toughened with20.2%PAEK PAEKABCDE2(1:,2:16.8%PAEK,3:20.2%PAEK,(AI,(B,(C,(D,(E(DFig.2Representative of three concept(1:nontoughened,2:Toughened with16.8%PAEK,3:Tough-ened with20.2%PAEK(Athe loaddisplacement plots of th

14、ree concepts(A(a,A(b,A(c,(Boptic photograph of the axial crosssection of three concepts(B(a,B(b,B(c,(CSEMmicrophotograph at the crack tip of three concepts(C(a,C(b,C(c,D(aand D(bis the morphology of fracture surface in Mode I test for concept2and concept3,respectively.E(a, and E(bis the magnication

15、of D(a,D(b,respectively4:341PAEKBMIPAEK,;,PAEK,(2A.PAEKBMI,G ICG IIC(2,.,PAEK .2.2IIII3, ,.PAEK,.II (4,I,.I,II(4a,;,PAEK (4b,4c,BMI(4d,4e,BMIPAEK,PAEK.,I,II,.BMI,PAEK,.III,PAEK,(16.8%BMI0.8µm,(20.2%BMI0.4µm,18.,3(concept 1(concept 2concept 3IIFig.3Loaddisplacement plot of the compositessam

16、ples nontoughened (concept 1and toughened (concept 2and concept 3in Mode IItest 4(1:,2:16.8%PAEK,3:20.2%PAEKFig.4Microscopic representative morphology on the fracture surface in Mode II test.(aNontoughened,(b,dtoughened with 16.8%PAEK,(c,etoughened with 20.2%PAEK,(d,eis the local magnication for the

17、 (b ,c,respectively34222.2.3,(Compression After Impact,CAI,.CAI.5,BMIC.,(5a,;(5b,C(5c,.,.BMI1436mm2(6.,1/2,.,6CAI,C.,CAI( 155MPa,CAI(250 MPa270MPa70%,.,;,C(6.(CAI,CAI.,.,.,.G ICG IIC,.,CAI(2.,(,(CAI.,PAEK,CAI,G IIC PAEK(2.,PAEK,;,I,19.,PAEKCAI.(7,PAEK BMI., 5(a(bCFig.5Appearance of the nontoughened

18、laminate on the face(a,backside(band the Cscan result(c4:3436BMIFig.6Impact damage,compression strength after the impact(CAIresults and the crosssection appearance for nontoughened and the toughened samples344227Fig.7Morphology in comparison between the nontoughened (aand toughened laminates,(band(c

19、are for laminates toughened with 16.8%and 20.%,respectively4Table 4Typical mechanical properties of the composite laminates in comparisonSpecimenMechanical property Nontough Toughened with Toughened with Test standardsened 16.8%PAEK20.2%PAEK0Tensile strength/MPa 1392150015500Tensile modulus/GPa10210

20、5112GB/T33541999Poisson ratio0.320.300.340Compression strength/MPa 1135111710710Compression modulus/GPa101104110GB/T38562005Flexural strength/MPa 168418061749Flexural modulus/GPa 108115113GB/T33562005Interlaminar shear strength/MPa103108104 GB/T335720058Fig.8Microscopic crosssection representative o

21、f intraply region and the graphite ber volume frac-tion in comparison.(aNontoughened,(btoughened with 16.8%PAEK,(ctoughened with 20.2%PAEK5G827/BMITable 5The thickness and V f of G827/BMI laminatesToughened with Toughened with Property Nontoughened16.8%PAEK20.2%PAEKAverage V f /%54.352.552.2Intraply

22、 V f /%55.760.261.3Thickness of the laminate/mm2.052.122.14,CAI.23,PAEK,BMI .2.4,4:345/,(Interleaving20. ,(4,4, ,.(5,(8.,RTM,RTM.31.,(BMI,I G IC IIG IIC,PAEK.2.,BMI,PAEK.I BMI;I, II,PAEK.3.(CAI ,:,.4.,.1F22raptor materials and processes,Highperformance Composites,/military/syst

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