ECC-Design Approach-中文

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1、ECCDesignApproachSoutheastUniversity,Nanjing,ChinaMay,2006VictorLiE.BenjaminWylieCollegiateChairProfessorofCivilandEnvironmentalEngineeringProfessorofMaterialsScienceandEngineeringUniversityofMichigan,AnnArbor,MI48105USAPresentationOutline报告提纲ECCMicromechanics细观力学Fiber/MatrixInterfaceTailo

2、ring纤维/基体界面设计MatrixTailoring基体设计TheoryVerifications理论验证2EngineeredCementitiousComposites工程水泥基复合材料WhatisECC?什么是ECCAclassofHPFRCC一种高性能纤维增强水泥基复合材料Strain-hardening应变硬化Lowfibercontent低纤维含量Micromechanicsbaseddesign基于细观力学设计CompositeECC-SteelDeckMiharaBridgeinHokkaido,Japan,20043OverallDesignSchem

3、e设计框架ductility+otherperformances延性＋其他性能Achievinghighperformancethroughcomponenttailoring通过对组份的优化设计获得高性能Fiber纤维Interface界面Matrix基体4CompositeDesignApproach复合设计方法–FlatCrackPropagation平直裂缝的扩展GriffithTypeCrackdm>dpBrokenorsoftening“springs”断裂或软化的弹簧SteadyStateFlatCrack稳态裂缝sssdss

4、ensionSofteningFRC应变软化的FRC20mmDamageStrain-hardeningECC应变硬化的ECC5MicromechanicsBasedDesignforFlatCrackPropagation基于细观力学设计的平直裂缝扩展FiberBridgingPropertiesAcrossCracks纤维在裂缝处桥接CompositeTensileStrain-Hardening复合拉伸应变硬化Micromechanics细观力学Steady-StateCrackAnalysesSpringCapacityAnalyses稳态裂缝分析、弹簧能力分析Fi

5、ber,Matrix,Interface纤维，基体，界面6BridgingFibersasNon-linearSprings非线性弹簧－桥接纤维20mmDamaged=0–100mmSpringLaw(sB-d)ofBridgingFibersCrackBridgingStresssBCrackOpeningdscudp7SteadyStateCrackingAnalyses稳态开裂分析State1状态1State2状态2EnergychangesfromState1to2:Energybalance=>B能量变化能量平衡8EnergyBalanceInterpretati

6、on能量平衡解析BSpringLaw(sB-d)ofBridgingFibers桥接纤维的弹簧定律CrackBridgingStresssBCrackOpeningd裂缝张开位移scusssdpdssDuringsteadystatecrackpropagation_稳定裂缝扩展阶段9ConditionforStrain-Hardening应变硬化条件RHS=crack-tiptoughness裂尖韧性=f(matrixcomposition)LHS=C=f(fiber,interface)>_SpringLaw(sB-d)ofBridgingFiberssBdscudpC

7、MaxComplementaryEnergy最大补充能量B≥GtipECCCompositeDesignBasis复合设计基础_基体组成纤维，界面桥接纤维的弹簧定律10MicromechanicalModelforsB-dCurve细观力学模型RVEsBdp(Le)p(f)PMatrixMatrixFiberLf-LedLeP(Le,d)

8、f=0SingleAlignedFiber单根平直纤维P(Le,f,d)PffzMatrixcrackplaneSingleInclinedFiber单根斜纤维sB-dSprin