Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Ivan Nedbal is active.

Publication


Featured researches published by Ivan Nedbal.


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2002

The influence of ductile tearing on fracture energy in the ductile-to-brittle transition temperature range

Petr Haušild; Ivan Nedbal; Clotilde Berdin; C. Prioul

The aim of this study is to examine the relationship between fracture energy and the ductile area measured on the fracture surface. Instrumented Charpy tests and fracture toughness tests are performed in the transition temperature range, as well as at lower temperatures. Quantitative fractographic analyses of Charpy specimens reveal a certain proportion of ductile fracture even if the Charpy test is conducted at low temperatures, below the transition temperature. The ductile fracture area situated next to the notch is correlated to fracture energy for all temperatures. In the transition temperature range, fracture energy and the ductile area have a large scatter. Since the limiting event in the development of the ductile area is the initiation of cleavage, the maximum principal stress has been computed in different specimens using the finite element method. It has been shown that the propagating ductile crack does not increase the stress level, but does increase the probability of cleavage fracture through an expansion of the plastic volume where weak points can be found.


Materials Science Forum | 2005

Textural Fractography of Fatigue Failures under Variable Cycle Loading

Hynek Lauschmann; Filip Siska; Ivan Nedbal

A new concept of counting time at fatigue processes is proposed, aimed to reach fractographic compatibility in cases of different loading sequences. Values of cycle effectivity are summarized to give the new reference time. The improvement is shown in application - textural fractography of three specimens loaded by constant cycle, constant cycle with periodic overloading, and a random block, respectively. In contrast to the conventional crack growth rate, the reference crack growth rate is related to common morphologic features of all fracture surfaces.


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2003

Microstructure of a reactor pressure vessel steel close to the zones of ductile tearing and cleavage

M. Karlik; Ivan Nedbal; Jan Siegl


International Journal of Fatigue | 2009

Fatigue crack growth history in damage tolerance design of aircraft structures

Jan Siegl; Ivan Nedbal; Jiří Kunz


Image Analysis & Stereology | 2011

AUTO-SHAPE ANALYSIS OF IMAGE TEXTURES IN FRACTOGRAPHY

Hynek Lauschmann; Ivan Nedbal


Fatigue & Fracture of Engineering Materials & Structures | 2008

Fractographic reconstitution of fatigue crack history -Part II

Ivan Nedbal; Hynek Lauschmann; Jan Siegl; Jiří Kunz


Materials Characterization | 2006

An unifying concept for fatigue: The reference crack growth rate

Hynek Lauschmann; Jan Siegl; Jiří Šumbera; Filip Šiška; Ivan Nedbal


Journal of Alloys and Compounds | 2004

Behaviour of an Fe-28Al-3Cr-Ce alloy under cyclic loading

M. Karlik; Ivan Nedbal; Jan Siegl; J. Prahl


Jsme International Journal Series A-solid Mechanics and Material Engineering | 2002

Statistical Aspects of Brittle Fracture in Low-Alloyed Steels

Bohumír Strnadel; Ivan Nedbal; C. Prioul; Masaki Shiratori


Acta Metallurgica Slovaca - Conference | 2013

CAUSES AND MECHANISMS OF SERVICE FAILURE OF TURBINE BLADES

Jan Siegl; Ivan Nedbal; Jiří Janovec; Pavlína Hájková; Jan Kober

Collaboration


Dive into the Ivan Nedbal's collaboration.

Top Co-Authors

Avatar

Jan Siegl

Czech Technical University in Prague

View shared research outputs
Top Co-Authors

Avatar

Hynek Lauschmann

Czech Technical University in Prague

View shared research outputs
Top Co-Authors

Avatar

Jiří Kunz

Czech Technical University in Prague

View shared research outputs
Top Co-Authors

Avatar

C. Prioul

École Centrale Paris

View shared research outputs
Top Co-Authors

Avatar

Filip Šiška

Czech Technical University in Prague

View shared research outputs
Top Co-Authors

Avatar

M. Karlik

Czech Technical University in Prague

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Masaki Shiratori

Yokohama National University

View shared research outputs
Top Co-Authors

Avatar

Bohumír Strnadel

Technical University of Ostrava

View shared research outputs
Top Co-Authors

Avatar

Filip Siska

Academy of Sciences of the Czech Republic

View shared research outputs
Researchain Logo
Decentralizing Knowledge