Fatigue strength of laser-welded foam-filled steel sandwich beams

被引：16

作者：

Karttunen, Anssi T. ^{[1
]}

Kanerva, Mikko ^{[1
,2
]}

Frank, Darko ^{[1
]}

Romanoff, Jani ^{[1
]}

Remes, Heikki ^{[1
]}

Jelovica, Jasmin ^{[1
]}

Bossuyt, Sven ^{[1
]}

Sarlin, Essi ^{[2
]}

机构：

[1] Aalto Univ, Dept Mech Engn, POB 14300, Aalto 00076, Finland

[2] Tampere Univ Technol, Dept Mat Sci, POB 589, Tampere 33101, Finland

来源：

MATERIALS & DESIGN | 2017年 / 115卷

基金：

芬兰科学院;

关键词：

Sandwich panels; Ultimate strength; fatigue strength; Hybrid structure; Scanning electron microscopy; BENDING RESPONSE; SHEAR STIFFNESS; T-JOINTS; PANELS; FRACTURE;

D O I：

10.1016/j.matdes.2016.11.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Laser stake-welded steel sandwich panels are widely used in engineering due to their high stiffness-to-weight ratios. The welds are thinner than the plates they join so that there are two crack-like notches on each side of a weld. As a consequence, the welded joints are susceptible to fatigue. In this study, as a remedy to the fatigue problem, low-density H80-grade Divinycell polyvinylchloride foam is bonded adhesively to the voids of stakewelded web-core sandwich beams. The foam reduces shear-induced stresses in the stake-welds. The choice of Divinycell H80 is founded on earlier J-integral-based finite element fatigue assessments of sandwich panels. Empty and the H80-filled sandwich beams are tested in three-point-bending for stiffness, ultimate strength and fatigue (load ratio R= 0.05). The failure modes in the weld joint region are studied using scanning electron microscopy. The experimental results showthat the filling increases the stiffness of the sandwich beams by a factor of three while the weight is increased only by 6%. The ultimate strength is increased by 2.7 times. As for the fatigue behavior, the slope increases from m= 4.508 of empty panels tom= 7.321 of filled panelswhile the load level at 2 million cycles increases by a factor of 8.5. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：64 / 72

页数：9

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