Microstructural and interface geometrical influence on the mechanical fatigue property of aluminum/high-strength steel lap joints using resistance element welding for lightweight vehicles: Experimental and computational investigation

In the fabrication process of medicine tablets, working speed of the tablet compressing is an important factor to realize the high fabricating efficiency together with the low cost. Thus, a number of loadings would be applied with very high frequency to tips of a couple of compressing punches. Sometimes, the tablet compressing speed exceeds 150 tablets per second. Due to such a circumstance, the very high cycle loadings are applied to the tips of the compressing punches making medicine tablets. The high strength steel of KNS-ES was specially designed and fabricated for the particular use as the compressing punches. In this study, very high cycle fatigue tests were performed in the loading type of rotating bending in order to obtain the fundamental S-N property of this steel. Based on experimental results, the S-N property in giga-cycle regime was discussed including the effect of the residual stress on the S-N properties. Consequently, the duplex S-N curves were clearly found, but the surface-induced fractures were often found in the fatigue data belonging to the second S-N curve in the longer life region.

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Effect of Bridge Pad Contact Edge on Fretting Fatigue Property in High Strength Steel

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2002.2.0_487 ◽

2002 ◽

Vol 2002.2 (0) ◽

pp. 487-488

Author(s):

Taisuke AKIYAMA ◽

Yasuo OCHI ◽

Takashi MATSUMURA ◽

Kiyotaka MASAKI

Keyword(s):

High Strength Steel ◽

Fatigue Property ◽

High Strength ◽

Fretting Fatigue

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Tensile Stress Analyses through Digital Image Correlation of Single Lap Joints of High Strength Steel and Aluminum Alloy Using Adhesive Bonding

Materials Science Forum ◽

10.4028/www.scientific.net/msf.879.363 ◽

2016 ◽

Vol 879 ◽

pp. 363-368 ◽

Cited By ~ 2

Author(s):

P.A.M.G.P. Bamberg ◽

Uwe Reisgen ◽

B. Marx ◽

J.D.V. Barbosa ◽

R.S. Coelho

Keyword(s):

Aluminum Alloy ◽

Stress State ◽

Digital Image Correlation ◽

Digital Image ◽

High Strength Steel ◽

Dissimilar Materials ◽

High Strength ◽

Lap Joints ◽

Image Correlation ◽

Single Lap Joints

Structural adhesives methods for joining multi material sheets have been focus of studies and researches for the last years. The most common and widely known type of test is the tensile test of single lap joints (SLJ). However, there are opportunities for analyzing the mechanical performance of such method in SLJ with materials of different properties, such as ductile structural aluminum alloys and high strength steels. It’s also known that the stress state of SLJ, when stressed longitudinally, generates secondary forces. One of them is known as cleavage force which initially leads to the failure of bonded joints. The aim of this work is to analyze the stress state of similar and dissimilar materials SLJ submitted to tensile stresses and also the influence of some variables, such as overlap length, adhesive film thickness and adherend yield limit, over the stress strength of the samples. As adherend materials it was selected the structural aluminum alloy AA 5083 H111 and the high strength steel DP600. At the end of this work it is expected to understand the proper stress state of the SLJ when using similar and dissimilar materials, identifying stress concentrators that bring the structure to fail, using the Digital Image Correlation (DIC) method. It was discovered that the yield strength associated with the overlap length highly influences the SLJ strength, by leading it to a close to pure adhesive shear stress state.

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The Study of Fatigue Life of the Crack of Weld Bead

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.324-325.467 ◽

2006 ◽

Vol 324-325 ◽

pp. 467-470 ◽

Cited By ~ 1

Author(s):

Dong Xia Li ◽

Ying Mei ◽

Fang Jia ◽

Bao Chun Jia

Keyword(s):

Fatigue Life ◽

High Strength Steel ◽

Welded Joint ◽

Fatigue Property ◽

High Strength ◽

Fatigue Tests ◽

Weld Bead ◽

Steel Weld ◽

Weld Joints ◽

Important Basis

The effects of multiple repairing-weld and TIG-dressing on the fatigue property of high strength steel weld joints used in platform have been investigated. Through the fatigue tests on high strength steel welded joint samples, the life estimating formula is obtained after each time of repairing weld and TIG-dressing. The S-N curve and the equation after repairing weld and TIG-dressing are given. The work in this paper offers an important basis for the multiple repairing-weld of platforms.

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