PSI - Issue 18

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 18 (2019) 823–836

25th International Conference on Fracture and Structural Integrity Estimation of Component Fatigue Lives under Service Load-Time Functions Using an Advanced Transfer Methodology for the Transition from Specimen to Component Related Material Behaviour Matthias Hell a* , Rainer Wagener b a Research Group System Reliability, Adaptive Structures and Machine Acoustics, TU Darmstadt, Magdalenenstr. 4, 64289 Darmstadt, Germany b Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstr. 47, 64289 Darmstadt, Germany Due to steadily shortening product development cycles, the design and validation of new products mainly takes place in a virtual environment. The structural durability and a reliable lightweight design is the key target to be achieved during the product development process. A fatigue assessment has therefore to be included in the product design process from the very beginning. Because prototypes are usually not available during early product development stages, it is necessary to estimate the component behaviour by transferring material properties, which have been determined by fatigue tests on material specimens with standardized geometry, to the component geometry. In order to enable a reliable statement about the structural durability based on these simplified tests, different influencing factors have to be considered. Some of the major influencing factors on fatigue are the component size and geometry, the boundary conditions of the loading and the load-time function, and a possible location and load history dependency of the material behaviour. The presented work will discuss those influences and how they can be treated by simplified approaches during the assessment of the component fatigue strength. 25th International Conference on Fracture and Structural Integrity Estimation of Component Fatigue Lives under Service Load-Time Functions Using an Advanced Transfer Methodology for the Transition from Specimen to Component Related Material Behaviour Matthias Hell a* , Rainer Wagener b a Research Group System Reliability, Adaptive Structures and Machine Acoust cs, TU Darmstadt, Magdalenenstr. 4, 64289 Da stadt, Germany b Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstr. 47, 64289 Darmstadt, Germany Abstract Due to steadily shortening product development cycles, the desi n and validation of new products mainly takes place in a virt al en ir n e t. The structural dur bility and a reliable lightweight design is the key target to be achieved during the product development process. A fatigue assessment has ther fore to be includ d in the product design process from the very beginning. Because prototypes are usu lly not available during early product development stages, it is nec ss ry to estimate t e component b haviour by transferring material properties, which have een determined by fatigue tests on material specimens with standardized geometry, to the compone t g ometry. In order to enable a reliable stat ment about the structural durability b sed on thes si plified tests, different influencing factors have to be considered. Some of the ajor influencing factors on fatigue are the component size and geometry, the boundary conditions of the loading and the load-time function, and a possible location and load history dependency of the materi l behaviour. T e presented work will discuss those influences and how they can be treated by simplified approaches during the assessment of the component fatigue strength. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: fatigue assessment; size effects; load sequence effects; cyclic stresss-strain behaviour Keywords: fatigue assessment; size effects; load sequence effects; cyclic stresss-strain behaviour

1. Introduction 1. Introduction

Designing competitive products, which adhere to steadily growing restrictions regarding energy consumption and overall product costs, requires a lean virtual product development process, which exploits the full potential of the material regarding fatigue behaviour and lightweight construction. At the same time, changes in materials feed stocks Designing competitive products, which adhere to steadily growing restrictions regarding energy consumption and overall product costs, requires a lean virtual product development process, which exploits the full potential of the material regarding fatigue behaviour and lightweight construction. At the same time, changes in materials feed stocks

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.232