PSI - Issue 16

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 16 (2019) 19–26

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers The work pr sents the an lysis of fatigue characteristics and differences betw en fatigue characteristics prepared with consid ration of the assumptions of small and large defo mations theories in the calculations. This is especially important with high-r ista ce materials, elastic-plastic materials nd th se working in the low-cycl fatigue conditions. It has been conclud d, s a result of the analysis that, irrespectively of mat rial, fatigue limit exponent and fatigue limit coefficient at tension compression increases, in terms of the absolute value, for finite deformations; whereas, a plastic fatigue deformation exponent and plastic fatigue deformation coefficient decreases in terms of the absolute value. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” The application of the theory of large deformations in uniaxial tension-compression of selected metals Andrzej Kurek a , Justyna Koziarska a , Tadeusz Łagoda a * , Karolina Łago da b a Opole University of Technology, Faculty of Mechanical Engineering, ul. Mikołajczyka 5, 45 -271 Opole, Poland b Wrocław University of Science and Technology, Faculty of Mechanical Engineering, ul. Łukasiewicza 5 -7, 50- 370 Wrocław, Poland 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” The applica ion f the theory f larg deformation in uniaxial tension-compression of selected metals Andrzej Kurek a , Justyna Koziarska a , Tadeusz Łagoda a * , Karolina Łago da b a Opole University of Technology, Faculty of Mechanical Engineering, ul. Mikołajczyka 5, 45 -271 Opole, Poland b Wrocław University of Science and Technology, Faculty of Mechanical Engineering, ul. Łukasiewicza 5 -7, 50- 370 Wrocław, Poland Abstract The work presents the analysis of fatigue characteristics and differences between fatigue characteristics prepared with consideration of the assumptions of small and large deformations theories in the calculations. This is especially important with high-resistance materials, elastic-plastic materials and those working in the low-cycle fatigue conditions. It has been concluded, as a result of the analysis that, irrespectively of material, fatigue limit exponent and fatigue limit coefficient at tension compression increases, in terms of the absolute value, for finite deformations; whereas, a plastic fatigue deformation exponent and plastic fatigue deformation coefficient decreases in terms of the absolute value. Keywords: deformations; logarithmic and engineering deformations; tension-compression Abstract

Keywords: deformations; logarithmic and engineering deformations; tension-compression

1. Introduction

1. Introduction

The results from materials tensile tests are used in finding the elastic and plastic properties of the materials tested. Thus, inter alia, the following is obtained: Young’s Modulus, original material yield strength, final strength, section coefficient, etc. The results from materials tensile tests are used in finding the elastic and plastic properties of the materials tested. Thus, inter alia, the following is obtained: Young’s Modulus, original material yield strength, final strength, section coefficient, etc.

* Corresponding author. Tel.: +48-77-449-8415 E-mail address: t.lagoda@po.opole.pl * Corresponding author. Tel.: +48-77-449-8415 E-mail address: t.lagoda@po.opole.pl

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. 10.1016/j.prostr.2019.07.017