TY - JOUR

T1 - Investigations of the Influence of a Superimposed Oscillation on the Fatigue Strength

AU - Behrens, Bernd Arno

AU - Hübner, Sven

AU - Rosenbusch, Daniel

AU - Müller, Philipp

N1 - Funding information: The authors gratefully acknowledge the financial support of the German Research Foundation (DFG) within the transregional collaborative research center TCRC73 “Manufacturing of complex functional components with variants by using a new sheet metal forming process—Sheet Bulk Metal Forming” project A7–116817829 (“Dynamic Process Forces”).

PY - 2020/9/23

Y1 - 2020/9/23

N2 - Within the scope of the transregional collaborative research centre TCRC73, the effects of an oscillation superimposed forming process for the production of a demonstrator component are investigated. Previous studies in this field were limited to a consideration of the process-related parameters such as the influence of the plastic work and the friction or the component-related parameters such as the influence of the surface quality and the mold filling. This research concentrates on the consideration of the mechanical vibration resistance of components that were manufactured superimposed oscillated. For this purpose, Wöhler tests are conducted in which the fatigue strength of superimposed oscillation pre-stretched test samples and oscillation-free pre-stretched test samples are investigated. First, Wöhler curves are generated in the tensile threshold range for tensile samples made out of the steels DC04 and DP600. Subsequently, tensile specimens are pre-stretched superimposed oscillated and oscillation-free. These specimens are subjected to a tensile threshold load until they break. The influence of the superimposed oscillation forming on the long-term fatigue of components is derived from the comparison of the bearable load cycles. Investigations of the microstructure of the specimens are conducted in order to draw conclusions about the influence on the long-term strength.

AB - Within the scope of the transregional collaborative research centre TCRC73, the effects of an oscillation superimposed forming process for the production of a demonstrator component are investigated. Previous studies in this field were limited to a consideration of the process-related parameters such as the influence of the plastic work and the friction or the component-related parameters such as the influence of the surface quality and the mold filling. This research concentrates on the consideration of the mechanical vibration resistance of components that were manufactured superimposed oscillated. For this purpose, Wöhler tests are conducted in which the fatigue strength of superimposed oscillation pre-stretched test samples and oscillation-free pre-stretched test samples are investigated. First, Wöhler curves are generated in the tensile threshold range for tensile samples made out of the steels DC04 and DP600. Subsequently, tensile specimens are pre-stretched superimposed oscillated and oscillation-free. These specimens are subjected to a tensile threshold load until they break. The influence of the superimposed oscillation forming on the long-term fatigue of components is derived from the comparison of the bearable load cycles. Investigations of the microstructure of the specimens are conducted in order to draw conclusions about the influence on the long-term strength.

KW - Fatigue strength

KW - Pre-strain

KW - Superimposed oscillation

UR - http://www.scopus.com/inward/record.url?scp=85091363859&partnerID=8YFLogxK

U2 - 10.3390/met10101274

DO - 10.3390/met10101274

M3 - Article

AN - SCOPUS:85091363859

VL - 10

SP - 1

EP - 10

JO - Metals

JF - Metals

SN - 2075-4701

IS - 10

M1 - 1274

ER -