共查询到20条相似文献,搜索用时 218 毫秒
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INSITUTEMOBSERVATIONOFINITIATIONANDPROPAGATIONOFCRACKSINNiAlFeINTERMETALLICSY.X.Lu;C.H.Tao;J.W.Zhang;M.L.XueandD.Z.Yang(Beiji... 相似文献
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INVESTIGATIONS ON THE FORMATION OF INITIAL CRACKS IN THERMAL BARRIER COATINGS PREPARED BY EB-PVD 总被引:2,自引:0,他引:2
INVESTIGATIONSONTHEFORMATIONOFINITIALCRACKSINTHERMALBARRIERCOATINGSPREPAREDBYEB-PVDS.K.Gong;L.Deng;F.S.LiuandH.B.Xu(Departmen... 相似文献
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DETERMINATION OF MICROCRACK BOUNDARY RESULTING FROM ROCK BLASTING WITH SEISMIC TRAVELTIME TOMOGRAPHY
Zhang JichunDepartment of Underground Eng Geotechnical Eng Southwest Jiaotong University Chengdu P. R. ChinaSong LinpingInstitute of Acoustics Lab of Modern Acoustics Nanjing University Nanjing P. R. China 《中国有色金属学会会刊》1998,(1)
DETERMINATIONOFMICROCRACKBOUNDARYRESULTINGFROMROCKBLASTINGWITHSEISMICTRAVELTIMETOMOGRAPHY①ZhangJichunDepartmentofUndergroundE... 相似文献
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PREDICTIONOFBLOCKCAVINGRATEUSINGSUBCRITICALCRACKGROWINGVELOCITYChaoPing;PanChangliang;SunZongqi;LuoLi(DepartmentofResourcesEx... 相似文献
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KINETICS OF LEACHING SPHALERITE WITH PYROLUSITE SIMULTANEOUSLY BY MICROWAVE IRRADIATION 总被引:5,自引:0,他引:5
Peng Jinhui Liu Chunpeng Department of Metallurgy Kunming University of Science Technology Kunming 《中国有色金属学会会刊》1997,(3)
KINETICSOFLEACHINGSPHALERITEWITHPYROLUSITESIMULTANEOUSLYBYMICROWAVEIRRADIATION①PengJinhui,LiuChunpengDepartmentofMetalurgy,Ku... 相似文献
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EFFECTOFMICROSTRUCTUREONFATIGUECRACKINITIATIONOFSHOTPEENEDCOPPERANDBRASSK.W.Xu;N.S.HuandJ.W.He(State-KeyLaboratoryforMechanic... 相似文献
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INTERACTIONOFPARTICLESWITHASOLIDIFIEDINTERFACEDURINGSOLIDIFICATIONOFMETALMATRIXCOMPOSITEREINFORCEDWITHPARTICLESCHUShuangjie;W... 相似文献
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INFLUENCESOFSULPHUREOUSIMPURITYANDMICROSHRINKAGEONHACBEHAVIOROFSUPER-STRENGTHSTEELS.K.He;G.S.WangandS.N.Wang(Beijinginstitute... 相似文献
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SOLUTIONCHEMISTRYOFELECTROKINETICBEHAVIOROFCARBONATEMINERALSHuYuehua;LuoLin;QiuGuangzhou(DepartmentofMineralEngineering,Centr... 相似文献
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对广泛用于铸件缩孔、缩松预测的判据G/T<K经验公式(常数K没有任何物理意义)进行了理论推导,得出判据的理论公式为对其物理意义进行了讨论,从理论上解释了判据对厚大型件取上限值,而薄壁件取下限值的原因。文章给出了该判据的应用实例。 相似文献
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利用Niyama判据对重力铸造铝合金摩托车车轮进行了缩孔、缩松预测.根据Niyama判据式G/√R探讨了影响缩孔、缩松的因素,并根据这些影响因素采取相应的工艺措施,消除或减轻了铸件的缩孔、缩松倾向. 相似文献
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通过采用构造插值函数以及对数值模拟过程中局部网格的进一步细化,一方面把修正的等液面收缩量法与网格细化进行结合,有效地提高了缩孔的预测精度,另一方面G/T~(1/2)判据与网格细化的综合运用,一定程度上实现了缩松预测中量的概念,是对铸件缩孔缩松数值模拟方法的有效补充。 相似文献
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介绍清华大学开发的计算机三维数值凝固模拟软件FT—Star的功能及其在二重集团公司的工艺性试验和应用研究。解决了软件实际应用于铸钢件凝固过程中出现的一些问题,摸索出一些计算经验和规律。对不同铸钢件如何恰当地剖分网格、确定缩孔缩松判据参数、优化补贴工艺设计等都进行了深入研究,保证了计算机数值模拟结果的精确、可靠。实现了铸造缩孔缩松缺陷的预测,避免过去靠经验来进行铸造工艺设计,使工艺设计更具有科学性,大大降低了铸造生产成本。 相似文献
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Shrinkage porosity exists more or less in heavy castings, and it plays an important role in the fatigue behavior of cast materials. In this study, fatigue tests were carried out on the QT400-18 cast iron specimens containing random degrees of shrinkage porosity defect. Experimental results showed that the order of magnitude of life scattered from 103 to 106 cycles when the shrinkage percentage ranged from 0.67% to 5.91%. SEM analyses were carried out on the shrinkage porosity region. The inter-granular discontinuous, micro cracks and inclusions interfered with the fatigue sliding or hindering process. The slip in shrinkage porosity region was not as orderly as the ordinary continuous medium. The shrinkage porosity area on fracture surface(SPAFS) and alternating stress intensity factor(ASIF) were applied to evaluate the tendency of residual life distribution; their relationship was fitted by negative exponent functions. Based on the intermediate variable of ASIF, a fatigue life prediction model of nodular cast iron containing shrinkage porosity defects was established. The modeling prediction was in agreement with the experimental results. 相似文献
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用有限元法对22t钢锭凝固过程进行了模拟,计算中采用了Galerkin方法和八节点等参数单元,同时考虑钢锭和锭模界面上初期紧密接触和后期气隙形成过程中界面热阻的变化。建立的模型具有通用性,能够处理各种不同类型的边界条件和变热物性参数,用等效凝固收缩量法预测钢锭冒口部位缩孔的位置和大小,用经适当修正后的G/(?)参数(G-温度梯度,R-冷却速度)预测钢锭内部缩松。计算温度与实测温度基本吻合。 相似文献