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5篇 您的检索式:作者名="M.Hofmann"
    题名 作者 年代 出处 被引量
1Effects of welding speed on the multiscale residual stresses in frictionstir welded metal matrix composites显示文摘The effects of welding speed on the macroscopic and microscopic residual stresses(RSes) in friction stir welded 17 vol.% SiCp/2009 Al-T4 composite plates were studied via neutron diffraction and an improved decoupled hierarchical multiscale modeling methods. Measurements showed that the macroscopic and total RSes had the largest variations in the longitudinal direction(LD). Increasing the welding speed led to higher values of measured LD macroscopic and total RSes in the matrix. The welding speed also significantly influenced the distributions and magnitudes of the microscopic RSes. The RSes were predicted via an improved hierarchical multiscale model, which includes a constant coefficient of friction based thermal model. The RSes in the composite plates before friction stir welding(FSW) were computed and then set as the initial states of the FSW process during modeling. This improved decoupled multiscale model provided improved predictions of the temperature and RSes compared with our previous model.X.X.Zhang L.H.Wu H.ANDra W.M.Gan M.Hofmann D.Wang D.R.Ni B.L.Xiao Z.Y.Ma 2019Journal of Materials Science & Technology2019,35,5:4
2Microscopic stresses in carbon nanotube reinforced aluminum matrix composites determined by in-situ neutron diffraction显示文摘One of the most desired strengthening mechanisms in the carbon nanotube reinforced aluminum matrix composites(CNT/Al)composites is the load transfer strengthening mechanism(LTSM).However,a fundamental issue concerning the LTSM is that quantitative measurements of load partitioning in these composites during loading are very limited.In this study,in-situ neutron diffraction study on the tensile deformation of the 3 vol.%CNT/2009 Al composite and the unreinforced 2009 Al alloy was conducted.The{311}and{220}diffraction elastic constants(DECs)of the 2009 Al alloy were determined.Using those DECs the average stress in the 2009 Al matrix of the composite was calculated.Then the average stress in the CNTs was separated by using the stress equilibrium condition.Computational homogenization models were also applied to explain the stress evolution in each phase.Predicted results agree with experimental data.In the present case,the average stress in the CNTs reaches 1630 MPa at the yield strength of the composite based on linear regression of the measured data,which leads to an increment of yield strength by about 37 MPa.As the result of this work,an approach to quantify load partitioning in the CNTs is developed for the CNT/Al composites,which can be applied to optimize the mechanical properties of the composites.X.X.Zhang J.F.Zhang Z.Y.Liu W.M.Gan M.Hofmann H.Andrä B.L.Xiao Z.Y.Ma 2020Journal of Materials Science & Technology2020,54,19:4
3三维重建CT在创伤学中的诊断优势显示文摘三维重建在骨骼检查方面意义越来越大,权衡其优点和诊断上的困难,目前已发现它对一定适应证有明显优势。F.P.J.Billet W.G.H.Schmitt B.Gay M.Hofmann M.Huber 刘建斌 1992放射学实践1992,7,1:3
4Bound exciton and donor–acceptor pair recombinations in ZnO显示文摘B. K.Meyer H.Alves D. M.Hofmann W.Kriegseis D.Forster F.Bertram J.Christen A.Hoffmann M.Stra?burg M.Dworzak U.Haboeck A. V.Rodina 2004phys stat sol (b)2004,,2:1
5查看详情显示文摘M.S.Dresselhaus A.Jorio M.Hofmann G.Dresselhaus and R.Saito 0,,:1
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