R03MS and R005MS approaches

As mentioned in The R1MS approach, the R1MS approach was developed for sheet thicknesses between 8 and 40 mm. When the original R1MS approach was developed, the selection of R = 1 mm was based on measurements of typical radii, published in literature. However it was found that in particular for weld roots, the radius of R = 1 mm often constrained the geometry. [1] Based on ideas from fracture mechanics and supported by high-resolution photography of the seam welds (as shown in the following figure) [1, 3], it was found that even at the weld toe, much smaller radii are needed to describe the weld accurately. We therefore developed similar approaches with different radii, depending on the sheet thickness. An overview is given in the following table, Overview of the Recommended RxMS Approach, Depending on the Used Sheet Thickness.

Sheet Thickness [mm]	Radius [mm]
0.5–2	0.05
2–20	0.3
20–100	1

3D CAD Model of a Seam Weld, Based on High-Resolution Photography

Using a radius as small as R = 0.05 mm not only fits into the geometric reality of seam welds, it also avoids introducing too large gaps between the sheets, which for example in overlap joints create large bending moments and stresses. [1]

Of course, the effect of such a small radius on fatigue is quite different from that of a large radius. In addition to the radius, size effects also play a role when considering the space into which a small crack can grow, and the highly stressed area along the weld seam. All of these effects are accounted for in the different stress-life curves associated with the different radii. [1]

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R03MS and R005MS approaches, Simcenter 3D 2021.1 Series

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