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排序方式: 共有200条查询结果,搜索用时 15 毫秒
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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
3.
Omar Hatamleh Iris V. Rivero Jed Lyons 《Journal of Materials Engineering and Performance》2007,16(5):549-553
The effects of laser, and shot peening on the residual stresses in friction stir welds (FSW) has been investigated. The surface
residual stresses were measured at five different locations across the weld in order to produce an adequate residual stress
profile. The residual stresses before and after sectioning the coupon from the welded plate were also measured, and the effect
of coupon size on the residual stress relaxation was determined and characterized. Measurements indicate that residual stresses
were not uniform along the welded plate, and large variation in stress magnitude could be exhibited at various locations along
the FSW plate. Sectioning resulted in significant residual stress relaxation in the longitudinal direction attributed to the
large change in dimensions in this direction. Overall, laser and shot peening resulted in a significant reduction in tensile
residual stresses at the surface of the specimens. 相似文献
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Friction stir welding (FSW), which has several advantages over the conventional welding processes, is a solid-state welding
process where no gross melting of the material being welded takes place. Despite significant advances over the last decade,
the fundamental knowledge of thermomechanical processes during FSW is still not completely understood. To gain physical insight
into the FSW process and the evaluation of the critical parameters, the development of models and simulation techniques is
a necessity. In this article, the available literature on modeling of FSW has been reviewed followed by details of an attempt
to understand the interaction between process parameters from a simulation study, performed using commercially available nonlinear
finite element (FE) code DEFORM. The distributions of temperature, residual stress, strain, and strain rates were analyzed
across various regions of the weld apart from material flow as a means of evaluating process efficiency and the quality of
the weld. The distribution of process parameters is of importance in the prediction of the occurrence of welding defects,
and to locate areas of concern for the metallurgist. The suitability of this modeling tool to simulate the FSW process has
been discussed. The lack of the detailed material constitutive information and other thermal and physical properties at conditions
such as very high strain rates and elevated temperatures seems to be the limiting factor while modeling the FSW process. 相似文献
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In this study, the very high cycle fatigue (VHCF) properties of 7050-T7451 aluminum alloy and its friction stir welding (FSW) butt welds have been investigated. The results show that the failure of FSW joints still occurs at 7.0 × 108 cycles. The fatigue properties of the FSW joints are superior to those of the base material, especially in the super long life regime. Most fatigue cracks initiate at the thermo-mechanically affected zone and heat affected zone on the advancing side of the FSW joints, and the susceptibility of these zones to fatigue is attributed to the metallurgical heterogeneity. 相似文献