Cyclic torsion very high cycle fatigue of VDSiCr spring steel at different load ratios |
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| Affiliation: | 1. Institute of Physics and Materials Science, BOKU, Peter-Jordan-Str. 82, A-1190 Vienna, Austria;2. Robert Bosch GmbH, Corporate Sector Research and Advance Engineering, Materials and Process Engineering Metals, P.O. 300240, 70442 Stuttgart, Germany;1. University of Natural Resources and Life Sciences, Institute of Physics and Materials Science, Peter-Jordan-Straße 82, 1190 Vienna, Austria;2. Technical Data Analysis, Inc.(TDA), 3190 Fairview Park Drive, Suite 650, Falls Church, VA 22042, USA;3. US Naval Air System Command, Patuxent River, MD, USA;1. Technical Data Analysis, Inc., 3190 Fairview Park Drive, Suite 650, Falls Church, VA 22042, USA;2. Materials Science and Engineering Department, and Engineering Science and Mechanics Department (Jointly Appointed), Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;3. University of Natural Resources and Life Sciences, BOKU, Vienna, Austria;4. US Naval Air System Command, Patuxent River, MD 20670, USA;1. Institute of Physics and Materials Science, BOKU, Peter Jordan Str. 82, A 1190 Vienna, Austria;1. ESTSetúbal, Instituto Politécnico de Setúbal, Campus do IPS, Estefanilha, 2914-508 Setúbal, Portugal;2. LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;3. ISEL, Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro, 1, 1959-007 Lisboa, Portugal |
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| Abstract: | Cyclic torsion fatigue tests with superimposed static torsion loads are performed with VDSiCr spring steel with shot-peened surface in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regime. Fatigue properties are investigated at load ratios R = 0.1, R = 0.35 and R = 0.5 up to limiting lifetimes of 5 × 109 cycles with a newly developed ultrasonic torsion testing method. Increasing the load ratio reduces the shear stress amplitude that the material can withstand without failure. Fatigue cracks are initiated at the surface in the HCF regime. In the VHCF regime, cracks are preferentially initiated internally in the matrix, below the surface layer with compression residual stresses, and less frequently at the surface. Cyclic and mean shear stresses with 50% survival probability in the VHCF regime are presented in a Haigh diagram. Linear line approximation delivers a mean stress sensitivity of M = 0.33 for load ratios between R = ?1 and R = 0.5. |
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| Keywords: | Cyclic torsion Load ratio VDSiCr spring steel Ultrasonic fatigue Very high cycle fatigue |
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