S. Kumar  J.‐P. Kruth 《Advanced Engineering Materials》2008,10(8):750-753

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Detleff Schermer Dr.‐Ing.  Ekkehard Fehling Prof. Dr.‐Ing.  Jochen Stürz Dipl.‐Ing. 《Mauerwerk》2008,12(1):13-18

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E. Solórzano  M. A. Rodriguez‐Perez  J. A. de Saja 《Advanced Engineering Materials》2008,10(6):596-602

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Changxin Chen  Yang Lu  Eric S. Kong  Yafei Zhang  Shuit‐Tong Lee 《Small (Weinheim an der Bergstrasse, Germany)》2008,4(9)

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Cheng‐Hung Huang  Kuan‐Yu Chen 《International journal for numerical methods in engineering》2007,69(7):1499-1520

An inverse phonon radiative transport problem with an alternative form of adjoint equation is solved in this study by using conjugate gradient method (CGM) to estimate the unknown boundary temperature distributions, based on the phonon intensity measurements. The CGM in dealing with the present integro‐differential governing equations is not as straightforward as for the normal differential equations; special treatments are needed to overcome the difficulties. Results obtained in this inverse analysis will be justified based on the numerical experiments where two different unknown temperature (or phonon intensity) distributions are to be determined. Finally, it is shown that accurate boundary temperatures can always be obtained with CGM. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

    

T. Michler Dr.‐Ing. 《Materialwissenschaft und Werkstofftechnik》2007,38(1):32-35

The formation of martensite in metastable austenitic stainless steels was investigated. The results showed that the formation of martensite in 304 grade stainless steels due to the exposure to cryogenic temperatures is negligible. The amount of formed martensite is dependent on the chemical composition of the actual heat but for standard grades the amount is not expected to exceed a very few percent. In welds the formation of martensite is not promoted by the presence of δ‐ferrite. The formation of martensite due to cold forming at room temperature can reach around 20 %. Cold forming with subsequent exposure to cryogenic temperatures does not lead to additional formation of martensite due to the exposure to low temperatures. Cold forming at low temperatures leads to the highest amount of martensite formed in metastable stainless steels.  相似文献   

    

G. Biallas Dr.‐Ing.  C. Sick  J. Schneider  K.‐H. Trautmann 《Materialwissenschaft und Werkstofftechnik》2007,38(9):705-711

Biaxial fatigue of friction stir welded stiffened panels Within the framework of the European WelAir project, cruciform specimens made from stiffening FSW overlap joints were fatigued in the DLR biaxial test rig. To resemble the loading situation of pressurized fuselage structures, proportional loading without any phase shift, but with different load ratios λ between the loading components in both directions was applied.Natural crack initiation and subsequent crack growth were governed by the stiffness gradient caused by introducing the stringer. Cracks initiated and propagated at run‐in and run‐out locations in a direction perpendicular to the weld seam. The shortest fatigue life was observed for uniaxial loading in welding direction (λ = 0). An additional stress component perpendicular to the joint line (λ > 0) resulted in a higher number of cycles to failure. Similar to single stringer panels, increasing the load ratio also increased the number of cycles to failure for FSW clip‐stringer structural members, but additionally gives a different location of the fatal crack.  相似文献   

    

C.‐S. Wu  C.‐F. Lin  H.‐Y. Lin  C.‐L. Lee  C.‐D. Chen 《Advanced materials (Deerfield Beach, Fla.)》2007,19(19):3052-3056

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J.‐H. Lee  Y.‐S. Kim  K. Constant  K.‐M. Ho 《Advanced materials (Deerfield Beach, Fla.)》2007,19(6):791-794

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D. Zhao  S.‐J. Seo  B.‐S. Bae 《Advanced materials (Deerfield Beach, Fla.)》2007,19(21):3473-3479

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