Patrick Larour
YOU?
Author Swipe
View article: Advanced Cut-Edge Characterization Methods for Improved Sheared-Edge Damage Evaluation in High-Strength Sheet Steels
Advanced Cut-Edge Characterization Methods for Improved Sheared-Edge Damage Evaluation in High-Strength Sheet Steels Open
This study investigates shear cutting of high-strength steel sheets, a process known to negatively impact the forming and fatigue properties of the material. The localized deformation near the cut edges imposes sheared-edge damage, especia…
View article: Advanced Cut Edge Characterization Methods for Improved Sheared Edge Damage Evaluation in High-Strength Sheet Steels
Advanced Cut Edge Characterization Methods for Improved Sheared Edge Damage Evaluation in High-Strength Sheet Steels Open
This study investigates shear cutting of high-strength steel sheets, a process known to negatively impact the forming and fatigue properties of the material. The localized deformation near the cut edges imposes sheared edge damage, especia…
View article: The influence of cut edge heterogeneity in complex phase steel sheet edge cracking: An experimental and numerical investigation
The influence of cut edge heterogeneity in complex phase steel sheet edge cracking: An experimental and numerical investigation Open
This study investigated how geometrical variations along the perimeter of sheared edges influenced the formability of advanced high-strength steel sheets during hole expansion. A combined numerical and experimental approach was employed, b…
View article: Numerical modelling of shear cutting in complex phase high strength steel sheets: A comprehensive study using the Particle Finite Element Method
Numerical modelling of shear cutting in complex phase high strength steel sheets: A comprehensive study using the Particle Finite Element Method Open
The study examines the shear cutting process of Advanced High Strength Steel using the Particle Finite Element Method. Shear cutting, a crucial process in sheet metal forming, often leads to microcracks and plastic deformation that degrade…
View article: Analysis of experimental scattering sources in local ductility measurement from flat tensile test sample fracture surfaces
Analysis of experimental scattering sources in local ductility measurement from flat tensile test sample fracture surfaces Open
Local formability measurement from fracture surfaces out of flat sheet tensile test samples is increasingly gaining momentum for AHSS automotive sheet steel grades characterization. A newly released VDA 238-110 test standard specifies the …
View article: Using the particle finite element method for predicting edge-cracking in complex phase high-strength steel sheets
Using the particle finite element method for predicting edge-cracking in complex phase high-strength steel sheets Open
Advanced High-strength steel (AHSS) sheets enable lightweight designs by reducing material thickness while retaining necessary structural properties. However, their high strength often complicates forming operations and increases vulnerabi…
View article: Competing failure modes in hole expansion testing of AHSS sheets
Competing failure modes in hole expansion testing of AHSS sheets Open
To identify limit edge strains of AHSS sheets, a multitude of parameter identification tests can be conducted. Among these, hole expansion tests (HET) using different punch geometries are most common. Herein, sheets of two AHSS grades were…
View article: Sheared edge formability characterization of cold-rolled advanced high strength steels for automotive applications
Sheared edge formability characterization of cold-rolled advanced high strength steels for automotive applications Open
Edge cracking has become a limiting factor in the use of some advanced high strength steels (AHSS) for high-performance automotive applications. This fact has motivated the development of a multitude of experimental tests for edge formabil…
View article: Stretch flangeability of AHSS automotive grades versus cutting tool clearance, wear, angle and radial strain gradients
Stretch flangeability of AHSS automotive grades versus cutting tool clearance, wear, angle and radial strain gradients Open
Stretch flangeability tests are performed on cold rolled AHSS automotive steel grades for crack sensitivity evaluation. The ISO16630 tests procedure is used with different cutting edge conditions including cutting clearance, cutting tool w…
View article: A critical assessment of notched tensile tests for formability mapping of AHSS sheets
A critical assessment of notched tensile tests for formability mapping of AHSS sheets Open
The influences of specimen geometry during the determination of local ductility have recently been investigated, using the fracture surfaces of standardized tensile tests specimens. Among the shortcomings of these specimens was the rather …
View article: Reduction of Young’s modulus for a wide range of steel sheet materials and its effect during springback simulation
Reduction of Young’s modulus for a wide range of steel sheet materials and its effect during springback simulation Open
Springback is among the key issues to be addressed in order to facilitate the application of AHSS in the automotive body. Since numerical simulations have become a standard tool during process design in automotive panel production, advance…
View article: Local formability assessment of AHSS steels with shear cut tensile tests
Local formability assessment of AHSS steels with shear cut tensile tests Open
As an alternative to the ISO16630 hole expansion test, the punched tensile test is increasingly popular for edge crack characterization of AHSS advanced high strength steels. In this investigation the reduction of area as well as thickness…
View article: Edge crack sensitivity versus tensile local ductility of AHSS sheet steels
Edge crack sensitivity versus tensile local ductility of AHSS sheet steels Open
There is a growing interest in correlating usual tensile testing results with edge crack sensitivity testing from punched ISO16630 hole expansion ratio HER (10mm shear cut hole, 12% clearance, conical expansion tool). A new kind of tensile…
View article: Experimental issues in the instrumented 3 point bending VDA238-100 test
Experimental issues in the instrumented 3 point bending VDA238-100 test Open
The instrumented 3-point bending test according to VDA238-100 test standard is increasingly used within the steel and automotive industry. Originally developed for aluminum hemming characterization, this bending test has been shown to be a…
View article: Local fracture strain measurement in AHSS uniaxial flat tensile tests considering specimen geometry and fracture morphology
Local fracture strain measurement in AHSS uniaxial flat tensile tests considering specimen geometry and fracture morphology Open
The local formability of AHSS sheet steels can be estimated by means of the relative average reduction of cross section area (or thickness) at fracture in flat tensile specimens. A 2D/3D characterization of tensile fracture shapes is perfo…
View article: Characterizing axial crash foldability of AHSS & UHSS sheets by means of L-profile compression tests
Characterizing axial crash foldability of AHSS & UHSS sheets by means of L-profile compression tests Open
Small-scale crash tests of crash boxes have established themselves as an assessment tool for high strength materials for their application in crash-relevant structures in the automotive body. However, when investigating UHSS grades it can …
View article: Influence of single hat crash box flange triggering and impactor top plate welding strategy on axial crash foldability of AHSS & UHSS sheets
Influence of single hat crash box flange triggering and impactor top plate welding strategy on axial crash foldability of AHSS & UHSS sheets Open
Axial crash tests are usually performed in order to assess the crash foldability of AHSS & UHSS sheets in the framework of a material homologation process. With a real component like single hat column geometry with RSW flange welded and MA…
View article: Influence of cutting tool stiffness on edge formability
Influence of cutting tool stiffness on edge formability Open
For the evaluation of the forming behaviour of cut edges of AHSS the Hole Expansion Test (HET) standardized in the ISO 16630 is generally used. However, the observed Hole Expansion Ratio (HER) is prone to significant scatter. One reason fo…
View article: Influence of specimen geometry on measures of local fracture strain obtained from uniaxial tensile tests of AHSS sheets
Influence of specimen geometry on measures of local fracture strain obtained from uniaxial tensile tests of AHSS sheets Open
Enhanced formability mapping, based on parameters derived from uniaxial tensile tests, has been proposed in order to distinguish between local versus global formability of AHSS sheets. The assessment of fracture surfaces represents the bas…
View article: Reduction of cross section area at fracture in tensile test: measurement and applications for flat sheet steels
Reduction of cross section area at fracture in tensile test: measurement and applications for flat sheet steels Open
This contribution deals with the use of maximum thinning and reduction of sample cross section area at fracture after tensile testing and applications for industrial flat sheet steels. Although included in all usual tensile testing standar…
View article: Press-hardening of zinc coated steel - characterization of a new material for a new process
Press-hardening of zinc coated steel - characterization of a new material for a new process Open
Press-hardening of zinc-coated PHS has been limited to the indirect process until a pre-cooling step was introduced before the hot forming to prevent liquid metal embrittlement. Even though that's only a minor change in the process itself …