Abstract
In the present study, statistical analysis for previously reported cut edge fatigue test results is performed. Experimental fatigue tests are conducted for machined, plasma, and fiber laser-cut S960 edges to verify the effect of yield strength and cut edge quality, and to study the effect of the cutting method on fatigue performance. Experimental fatigue tests were complemented with hardness and residual stress measurements and metallurgical analyses with electron backscatter diffraction (EBSD) to characterize cut edge fatigue properties and to verify statistical analysis findings. The results show that cut edges can be divided into high- and low-quality categories. On the basis of these high- and low-quality categories, material strength, and applied cutting methods, FAT classes and recommended fatigue design practices are proposed.
Highlights
Cutting is an important manufacturing method that has recently been developed to incorporate fiber laser technology
Surface quality was measured with an optical profilometer (Keyence VR-3200), with the results presented in Table 7 together with the FAT classes given as function of plate thickness in EN9013 [25] and further restricted with maximal Rz5 values in EN13001 [3]
Supplementing the statistical analysis with more results of various cutting methods, indicated that the material strength-based approach for FAT classes could not be used without considering defects and cut edge hardness due to the fatigue performance of low quality (LQ) cut edges being found as material independent
Summary
Cutting is an important manufacturing method that has recently been developed to incorporate fiber laser technology. The FAT classes – defined by the EN13001 standard – have been found as more suitable for fatigue strength as sessments than those recommended in previous studies by the IIW Recommendations or Eurocode 3 [1,2] All these design standards, have been found to provide conservative FAT classes, partic ularly for reactive fusion-cut edges with high surface roughness and cut edges with burr attachment. The experimental study concentrates to fiber laser fusion cutting since a lack of fatigue test results was found in the liter ature review and is performed to verify the statistical analysis findings and to establish knowledge of the combined effects of metallurgy, re sidual stresses, and surface quality on the fatigue performance of cut edges
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