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) 97–104

© 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 development of mechanical fields befor the crack tip and the appropriate development of the cracking pro ess in S355JR ferritic steel are analyzed . I order t obtain different cracking mechanisms, the tests were carried out in the te perature rang from – 120 0 C to + 20 0 C. Experimental research has been supplemente with the SEM observation of the specimens fractur surface. Specimens modeling and load simulations were performed using the MES in the ABAQUS program. The accurate calibration of the true stress-strain material dependenc was made. The distributions of local stresses and strains i front of th crack were determine for specimens tested at different temperatures and revealed, respectively, different fracture mechanisms. The development of mechanical fields at various stages of specimens loading was analyzed. The stress and strain levels were determined, at w ich different fracture mechanisms (completely brittle, mixed brittle-ductile or completely ductile) realize. © 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” Evolution of the mechanical fields and fracture process of S355JR steel Ihor Dzioba*, Sebastian Lipiec Kielce University of Technology, Aleja Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland The development of mechanical fields before the crack tip and the appropriate development of the cracking process in S355JR ferritic steel are analyzed . In order to obtain different cracking mechanisms, the tests were carried out in the temperature range from – 120 0 C to + 20 0 C. Experimental research has been supplemented with the SEM observation of the specimens fracture surface. Specimens modeling and load simulations were performed using the MES in the ABAQUS program. The accurate calibration of the true stress-strain material dependence was made. The distributions of local stresses and strains in front of the crack were determined for specimens tested at different temperatures and revealed, respectively, different fracture mechanisms. The development of mechanical fields at various stages of specimens loading was analyzed. The stress and strain levels were determined, at which different fracture mechanisms (completely brittle, mixed brittle-ductile or completely ductile) realize. 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” Evolution of the mechanical fields and fracture process of S355JR steel Ihor Dzioba*, Sebastian Lipiec Kielce University of Technology, Aleja Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland Abstract Abstract Keywords: fracture mechanics; calibration of constitutive relation; numerical calculations; stress and strain distribution in crack front.

Keywords: fracture mechanics; calibration of constitutive relation; numerical calculations; stress and strain distribution in crack front.

1. Introduction

1. Introduction

Structural elements made of ferritic steels are widely used in various types of constructions and mechanisms, and are operated in a wide temperatures range. In order to properly design and with the following safe operation of these elements, information about their strength characteristics and resistance to cracking in the range of working Structural elements made of ferritic steels are widely used in various types of constructions and mechanisms, and are operated in a wide temperatures range. In order to properly design and with the following safe operation of these elements, information about their strength characteristics and resistance to cracking in the range of working

* Corresponding author. Tel.: +48 41-342-4303. E-mail address: pkmid@tu.kielce.pl * Corresponding author. Tel.: +48 41-342-4303. E-mail address: pkmid@tu.kielce.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.2019.07.027