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Additionally, the shear strength of the base metal must also be considered φ Rn = 09 x 06 Fy x area of base metal subjected to shear where, Fy is the yield strength of the base metal For example T Elevation Plan T Elevation Plan Strength of weld in shear Strength of base metal = 075 x 0707 x a x Lw x fw = 09 x 06 x Fy x t x LwThe yield strength using the API method is defined as the stress at a strain of 05% elongation This yield strength is less than the ultimate strength of the sample equation represents the allowable manufacturer's tolerance of minus 125% on wall thicknessYield strength collapse Yield strength collapse is based on yield at the inner wall using the Lamé thick wall elastic solution This criterion does not represent a "collapse" pressure at all For thick wall pipes (D/t < 15±), the tangential stress exceeds the yield strength of the material before a collapse instability failure occurs Burst Pressure What It Is And Why It S So Important Corrosion Mate