Stress intensity approach for spot-welded and similar lap joints

Fatigue strength and reliability of structural components in railroad commercial vehicles are usually decided by spot weld. Thus, it is very important to develop a fatigue design method for spot welded multi-lap joints in railroad commercial vehicles. The objective of this paper is to provide an integrated fatigue design criterion for spot-welded multi-lap joints used in the body of railroad commercial vehicles. Based on finite element analysis, the fatigue life data for spot-welded multi-lap joints is correlated in terms of the maximum stress intensity factor, K θ max , that is the fracture mechanical parameter. From the results, using Δ K θ max - N f relationship, a proper fatigue life design rule independent on geometric variables and material properties for components having spot welded multi-lap joints can be established.

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Microstructure and Mechanical Properties of Resistance-Spot-Welded AISI-1008 Steel Lap Joints Using Multiwalled Carbon Nanotubes as an Interlayer

Journal of Materials Engineering and Performance ◽

10.1007/s11665-021-05687-3 ◽

2021 ◽

Author(s):

Tanmoy Das ◽

Sushanta Kumar Panda ◽

Jinu Paul

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Multiwalled Carbon Nanotubes ◽

Lap Joints ◽

Multiwalled Carbon ◽

Resistance Spot ◽

Microstructure And Mechanical Properties ◽

Spot Welded

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Spot Weldability Assessment of Similar and Dissimilar Steel Sheets for Light Weight Automobile Body

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.306-308.899 ◽

2006 ◽

Vol 306-308 ◽

pp. 899-904

Author(s):

Dong Ho Bae ◽

Won Seok Jung ◽

J.B. Heo

Keyword(s):

Stainless Steel ◽

Fatigue Strength ◽

Lap Joints ◽

Vehicle Body ◽

Rolled Steel ◽

Cold Rolled Steel ◽

Steel Sheets ◽

Automobile Body ◽

Cold Rolled ◽

Spot Welded

An effective way to reduce the weight of vehicle body seems to be application of new materials, and such trend is remarkable. Among the various materials for automobile body, stainless steel sheets and cold rolled steel sheets are under the interests. However, in order to guarantee reliability of new material and to establish the long life fatigue design criteria for body structure, it is necessary to assess spot weldability and fatigue strength of spot welded lap joints fabricated under optimized spot welding condition. In this paper, spot weldability of stainless steel sheets, STS301L and STS304L, and cold rolled steel sheets, SPCC and SPCD. Fatigue strength of lap joints spot welded between similar and dissimilar materials were also assessed.

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