Now showing items 21-40 of 43

    • Fracture mechanics based modelling of failure in advanced high strength steels 

      Jonsén, Par; Frómeta Gutiérrez, David; Casellas Padró, Daniel (2017)
      Conference report
      Open Access
      In the last decade, the favorable properties of the press hardening process for advanced high strength steel (AHSS) have increased the demands concerning passenger safety and lightweight design. AHSS show excellent mechanical ...
    • Fracture resistance of advanced high-strength steel sheets for automotive applications 

      Frómeta Gutiérrez, David; Lara, Antoni; Grifé, Laura; Dieudonné, Thomas; Dietsch, Pascal; Rehrl, Johannes; Suppan, Clemens; Casellas Padró, Daniel; Calvo Muñoz, Jessica (2021-01-03)
      Article
      Open Access
      The fracture resistance of different advanced high strength steel (AHSS) sheets for automotive applications is investigated through conventional tensile tests, fracture toughness measurements and hole expansion tests. ...
    • Fracture toughness characterization of advanced high strength steels by means of the essential work of fracture 

      Llobet Lorenzo, Alberto; Casellas Padró, Daniel; Riera Colom, María Dolores; Prado Pozuelo, José Manuel (2008)
      Conference report
      Restricted access - publisher's policy
      Fracture toughness cannot be readily measured in metal sheet because the small thickness in which they are used (1-3 mm). In this sense the essential work of fracture (EWF) has been successfully applied to determine ...
    • Fracture toughness to understand stretch-flangeability and edge cracking resistance in AHSS 

      Casellas Padró, Daniel; Lara, Antoni; Frómeta Gutiérrez, David; Gutierrez Castillo, David; Molas Busquets, Sílvia; Pérez Caro, Lluís; Rehrl, Johannes; Suppan, Clemens (2016-10-20)
      Article
      Open Access
      The edge fracture is considered as a high risk for automotive parts, especially for parts made of advanced high strength steels (AHSS). The limited ductility of AHSS makes them more sensitive to the edge damage. The ...
    • Geometry of nanoindentation cube-corner cracks observed by FIB tomography: Implication for fracture resistance estimation 

      Cuadrado Lafoz, Nuria; Seuba, J.; Casellas Padró, Daniel; Anglada, M.; Jiménez Piqué, Emilio (Elsevier, 2015-09-01)
      Article
      Open Access
      When indenting a brittle material with a sharp indenter, cracks can be generated at the corners of the imprint. From the length of these cracks, the fracture resistance can be estimated. This technique is simple and allows ...
    • Hard cutting of tailored hardened 22MnB5 

      Laumann, Till; Picas Anfruns, Ingrid; Grané, Marc; Casellas Padró, Daniel; Riera Colom, María Dolores; Valls, Isaac (Technischen Universität Graz, 2010)
      Conference report
      Restricted access - publisher's policy
      In the present work, the feasibility of creating low strength zones in flanges of tailored hardened 22MnB5 is evaluated by means of the combining high and low thermal conductivity tool materials. Finite Element (FE) ...
    • High temperature scratch testing of hard PVD coatings deposited on surface treated tool steel 

      Pujante, Jaume; Vilaseca, Montserrat; Casellas Padró, Daniel; Riera Colom, María Dolores (2014-09-15)
      Article
      Open Access
      Scratch testing is one of the most usual characterisation techniques for systems with thin hard coatings. Scratch tests are performed at run at room temperature, due to the risk of degradation of the indenter diamond tip ...
    • Identification of fracture toughness parameters to understand the fracture resistance of advanced high strength sheet steels 

      Frómeta Gutiérrez, David; Parareda, Sergi; Lara, Antoni; Molas Busquets, Sílvia; Casellas Padró, Daniel; Jonsén, P.; Calvo Muñoz, Jessica (2020-04-15)
      Article
      Restricted access - publisher's policy
      The fracture toughness of four advanced high strength steel (AHSS) thin sheets is evaluated through different characterization methodologies, with the aim of identifying the most relevant toughness parameters to describe ...
    • Journal of Physics: Conference Series 

      Calvo Muñoz, Jessica; Frómeta Gutiérrez, David; Molas Busquets, Sílvia; Casellas Padró, Daniel (Institute of Physics (IOP), 2017)
      Article
      Open Access
      Lightweight designs and demanding safety requirements in automotive industry are increasingly promoting the use of Advanced High Strength Steel (AHSS) sheets. Such steels present higher strength (above 800 MPa) but lower ...
    • Micro-mechanical damage in tool steels analyzed by acoustic emission technique 

      Picas Anfruns, Ingrid; Martínez González, Eva; Casellas Padró, Daniel; Romeu Garbí, Jordi (2012-12-30)
      Article
      Restricted access - publisher's policy
      The carbides in tool steels act as hard particles and dictate the wear resistance. The origin of failure of these steels is mostly related with the carbide cracking, as a nucleation site of final cracks. This paper shows ...
    • Micromecanismos de daño sub-superficiales inducidos por indentación esférica en aceros herramientas recubiertos 

      Ramírez Sandoval, Giselle; Jiménez Piqué, Emilio; Mestra Rodríguez, Álvaro Miguel; Vilaseca, Montse; Casellas Padró, Daniel; Llanes Pitarch, Luis Miguel (2013)
      Conference report
      Restricted access - publisher's policy
    • Microstructural effects on fracture toughness of ultra-high strength dual phase sheet steels 

      Frómeta Gutiérrez, David; Cuadrado Lafoz, Nuria; Rehrl, Johannes; Suppan, Clemens; Dieudonné, Thomas; Dietsch, Pascal; Calvo Muñoz, Jessica; Casellas Padró, Daniel (2021-01-20)
      Article
      Open Access
      The influence of the microstructure on the fracture toughness of two industrially processed 1000 MPa dual-phase (DP) steel grades is investigated. Crack initiation and propagation resistance are evaluated by means of the ...
    • Microstructural effects on the fatigue crack nucleation in cold work tool steels 

      Picas Anfruns, Ingrid; Cuadrado, Núria; Casellas Padró, Daniel; Goez, Alexey; Llanes Pitarch, Luis Miguel (2010-04)
      Article
      Restricted access - publisher's policy
      Crack nucleation mechanisms in two types of cold work tool steels were evaluated under monotonic and cyclic loading conditions. The effect of the microstructural constituents: the primary alloy carbides and the tempered ...
    • Modelización y simulación de la compactación de una pieza pulvimetalúrgica 

      Riera Colom, María Dolores; Casellas Padró, Daniel; Prado Pozuelo, José Manuel (2001)
      Conference report
      Open Access
      En la industria del conformado, el diseño y el control de los procesos se han basado en la experiencia y, a menudo, se ha considerado un arte. La aplicación de los métodos numéricos reduce el coste del diseño y del propio ...
    • New tool to evaluate the fracture resistance of thin high strength metal sheets 

      Frómeta Gutiérrez, David; Lara, Antoni; Parareda Oriol, Sergi; Grifé, Laura; Casellas Padró, Daniel (Institute of Physics (IOP), 2020-11-19)
      Article
      Open Access
      Fracture toughness has become a key property to predict the fracture performance of high strength metal sheets (edge cracking resistance, crash failure behaviour, local formability, etc.). However, the measurement of the ...
    • On the correlation between fracture toughness and crash resistance of advanced high strength steels 

      Frómeta Gutiérrez, David; Lara, Antoni; Molas Busquets, Sílvia; Casellas Padró, Daniel; Rehrl, Johannes; Suppan, Clemens; Larour, Patrick; Calvo Muñoz, Jessica (2019-01-01)
      Article
      Restricted access - publisher's policy
      Automotive industry players have devoted large efforts to identify the material parameters governing the crash resistance of Advanced High Strength Steels (AHSS). Such knowledge is essential to improve impact performance ...
    • R-Curve approach to describe the fracture resistance of tool steels 

      Picas Anfruns, Ingrid; Casellas Padró, Daniel; Llanes Pitarch, Luis Miguel (2016-06)
      Article
      Open Access
      This work addresses the events involved in the fracture of tool steels, aiming to understand the effect of primary carbides, inclusions, and the metallic matrix on their effective fracture toughness and strength. ...
    • Sheet failure prediction during forming of advanced high strength steels 

      Gutiérrez, D.; Hernández, R.; Riera Colom, María Dolores; Lara, Toni; Casellas Padró, Daniel; Prado Pozuelo, José Manuel (2013)
      Conference report
      Open Access
      The automotive industry has increased significantly the use of advanced high strength steels (AHSS) in many structural components of vehicles, with the aim to reduce weight and also increase safety. The high resistance ...
    • Simulación de la compactación de polvo metálico: efecto del estado tensional de la matriz de compactación 

      Riera Colom, María Dolores; Casellas Padró, Daniel; Prado Pozuelo, José Manuel (2001)
      Conference report
      Open Access
      En este trabajo se presenta una primera simulación mediante el programa de elementos finitos ABAQUS de un proceso completo de compactación en frío de polvo metálico. El análisis comprende la colocación en la matriz de un ...
    • Simulation of hot stamping processes 

      Riera Colom, María Dolores; Coussirat Núñez, Miguel Gustavo; Guardo Zabaleta, Alfredo de Jesús; Valls, I; Casellas Padró, Daniel (Grips' Media Gmbh, 2008)
      Conference report
      Restricted access - publisher's policy
      Hot stamping is a thermo-mechanical technique that enables to give to a metallic blank the desired geometry and properties in a single step, where deformation at high temperature, phase transformations and heat transfer ...