TY - CHAP A1 - Zerbst, Uwe A1 - Madia, Mauro A2 - Yadroitsev, I. A2 - Yadroitsava, I. A2 - Du Plessies, A. A2 - McDonald, E. T1 - Structural integrity II: fatigue properties T2 - Fundamentals of laser powder bed fusion of metals N2 - If a component is cyclically loaded, its load carrying capacity is considerably lower than in the monotonic loading case. This general observation applies in particular to L-PBF parts. The causes of this are mainly material defects such as pores and unwelded regions (Chapter 8) and a pronounced surface roughness in the as-built condition (Chapter 9). In addition, effects due to the anisotropy of the microstructure (Chapter 6) and a complex residual stress pattern (Chapter 7) play an important role. A consequence is that common strategies of fatigue assessment cannot be transferred to L-PBF applications without modifications. Due to the inhomogeneity of the material, the determination of representative material properties and the transfer to the component is a problem, and this is also the case with regard to the consideration of defects, surface roughness and residual stresses. The chapter gives a brief introduction to these problem areas. PB - Elsevier Inc. CY - Amsterdam KW - Fatigue crack propagation stagesdefects KW - Fatigue strength KW - Fatigue life KW - Fracture mechanics PY - 2021 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/52854 AN - OPUS4-52854 SN - 978-0-12-824090-8 SP - 377 EP - 394 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany