激光冲击金属箔板微复合成形的研究

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1、万方数据激光冲击金属箔板微复合成形的研究纳米压痕测试实验结果表明激光冲击后零件的纳米硬度、塑性及弹性模量均得到了提高。最后，基于ANSYS／LS．DYNA有限元软件平台对激光搭接冲击微压印与微落料的复合成形和激光冲击软模微冲裁与微落料的复合成形过程进行了数值模拟。采用Johnson．Cook和Mooney．Rivlin本构模型分别模拟了金属试样和聚氨酯橡胶软模的动态响应行为，经过数值模拟发现上述材料模型可以很好的预测试样的动态响应行为。讨论了两种工艺条件下复杂零件的成形过程、应变的变化、Z轴坐标变化历程及工件在不同部位

2、的厚度减薄情况。数值模拟与实验结果对比发现，模拟结果与实验的结果吻合度较高，说明了数值模型的正确性以及可靠性。激光冲击金属箔板微复合成形是一种新型的微成形加工工艺，本文研究为高性能复杂零件的成形的实际应用奠定了理论基础和实验指导。关键词：激光冲击，微成形，复合成形，微压印，微落料，微冲裁，数值模拟II万方数据江苏大学硕士学位论文ABSTRACTLasershockmicro-formingISanewmethodforthemanufactureofmicrometalparts，whichhasmanyadvanta

3、gessuchashighefficiency,lowcostandlongfatiguelifetime．However,theexistinglasershockmicroformingissingleprocessandtheformedpiecesaremostlymicropits，holesorsimplemicro-bendingparts，andthemultiprocessofcomplexpartshasnotbeeninvolvedyet．Therefore，researchonlasershoc

4、kmicrocompoundformingofmetalfoilhasimportanttheoreticalandpracticalvalue．SupportedbytheprojectofNationalNaturalScienceFoundationofChina”basicresearchonmicro—formingofmetalfoilbylaserdrivenflyer”，thisthesisbuildsanexperimentalplatformforthemicrocompoundformingofm

5、etalfoilbylasershock．Asystematicresearchhasbeenconductedonthemicrocompoundformingofmetalfoilbylasershock．Andthemainworkandresearchresultsareasfollows：Firstly,manycriticalbasictheoriesassociated、析mlasershockcompoundformingofmetalfoil，suchastheforceeffectmechanism

6、oflaserinducedplasma，formingmechanismandthecalculatedmethodofpeakpressureoflaserinduced，hasbeenresearchedinthisthesis．Inaddition，italsodescribesthetreatmentoffluiddynamicsandcharacteristicsofwavepropagationindifferentimpedancemedia．Atlast，itrevealsthedynamicyiel

7、dstrengthofmaterialsunderhighstrainrateandthepropagationcharacteristicsoftheworkpieceintemalstresswave．Secondly,themicrocompoundembossingandblankingofmetalfoilbylasershockWasconductedoncopperfoilswith17pminthicknessbySpitLight2000Nd—YAGlaser,whichresearchedtheef

8、fectsoflaserenergiesonthepropertiesofformedpartsunder50％overlappingrate．Thesurfacetopographyandsurfaceroughnessoftheformedpartswereconsistentwitllthatofmicrodie．Andth