Mats Sigvant
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View article: Prediction of sheet metal part production robustness using advanced tribological models, thermo-mechanical modelling and stochastic FE-simulations
Prediction of sheet metal part production robustness using advanced tribological models, thermo-mechanical modelling and stochastic FE-simulations Open
The automotive industry is currently facing increasing sustainability demands in order to reduce the environmental impact of their businesses and products. As a part of these demands, reduced amount of scrapped parts in current production …
View article: Integrating Stamping Tool Temperature Effects into Early-Stage Process Design: Insights from an Industrial Benchmark
Integrating Stamping Tool Temperature Effects into Early-Stage Process Design: Insights from an Industrial Benchmark Open
Reducing the CO2 footprint has become a key objective in the manufacturing sector, with the automotive industry being no exception. A significant portion of a car body consists of stamped components, making the reduction of CO2 emissions i…
View article: Uncertainty quantification for conical hole expansion test of DP800 sheet metal
Uncertainty quantification for conical hole expansion test of DP800 sheet metal Open
The hole expansion ratio (HER) observed in a standardized hole expansion test (HET) is commonly used to determine the edge fracture of steel sheets. A large variation of the measured HER restricts the practical application of the method. T…
View article: Investigation of Temperature Impact on Friction Conditions in Running Production of Automotive Body Components
Investigation of Temperature Impact on Friction Conditions in Running Production of Automotive Body Components Open
During the running production of automotive body components drifts in the process window is seen causing problems with non-conforming parts. Up until now, these drifts have been counter-acted based on the knowledge and experience of the pr…
View article: Creating a Virtual Shadow of the Manufacturing of Automotive Components
Creating a Virtual Shadow of the Manufacturing of Automotive Components Open
Within the automotive industry, there is an increasing demand for a paradigm shift in terms of which materials are used for the manufacturing of the automotive body. Global climate goals are forcing a rapid adaption of new, advanced, susta…
View article: Optimizing Reverse-Engineered Finite Element Models for Accurate Predictions of Experimental Measurements
Optimizing Reverse-Engineered Finite Element Models for Accurate Predictions of Experimental Measurements Open
This study investigates the challenges of reverse engineering in finite element modelling of sheet metal forming, specifically for the Volvo XC90 front door inner component. Advanced models incorporating anisotropic behaviour of steel and …
View article: An evaluation method for experimental necking detection of automotive sheet metals
An evaluation method for experimental necking detection of automotive sheet metals Open
In sheet metal stamping, the occurrence of strain localization in a deformed sheet is considered a failure. As so, sheet metal’s formability is conventionally evaluated using the Forming Limit Diagram (FLD), which separates the principal s…
View article: Three Industrial Cases of Sheet Metal Forming Simulations with Elastic Dies
Three Industrial Cases of Sheet Metal Forming Simulations with Elastic Dies Open
Previous research and experience points to many advantages if sheet metal forming is simulated with elastic dies. Some areas that are enabled by simulations with elastic dies are virtual spotting, improved digital twins, and improved produ…
View article: An overview of Methods for Simulating Sheet Metal Forming with Elastic Dies
An overview of Methods for Simulating Sheet Metal Forming with Elastic Dies Open
Sheet metal forming (SMF) simulations are traditionally carried out with rigid active forming surfaces. This means that the elasticity and dynamics of presses and die structures are ignored. The only geometries of the tools included in the…
View article: Material variability effects on automotive part production process
Material variability effects on automotive part production process Open
The current efforts to reduce the carbon footprint throughout the chain in the automotive industry by increased use of recycled materials poses new challenges for materials production and their use. The increase of steel scrap fraction in …
View article: Proposal of a New Tool for Pre-Straining Operations of Sheet Metals and an Initial Investigation of CR4 Mild Steel Formability
Proposal of a New Tool for Pre-Straining Operations of Sheet Metals and an Initial Investigation of CR4 Mild Steel Formability Open
With the increased focus on reducing carbon emissions in the automotive industry, more advanced materials are introduced to reduce the vehicle weight, and more complex component geometries are designed to both satisfy customer demands and …
View article: Friction and lubrication modelling in sheet metal forming: Influence of local tool roughness on product quality
Friction and lubrication modelling in sheet metal forming: Influence of local tool roughness on product quality Open
To improve the accuracy of forming simulations, advanced friction models are increasingly used in the industry. These models account for the physical properties of the sheet, tool and lubrication and describe the tribological conditions du…
View article: Failure Prediction of Automotive Components Utilizing a Path Independent Forming Limit Criterion
Failure Prediction of Automotive Components Utilizing a Path Independent Forming Limit Criterion Open
An area in the automotive industry that receives a lot of attention today is the introduction of lighter and more advanced material grades in order to reduce carbon emissions, both during production and through reduced fuel consumption. As…
View article: An industrial application case to predict galling in hot stamping processes
An industrial application case to predict galling in hot stamping processes Open
Severe tool wear is an unwanted phenomenon which occurs widely during hot stamping processes due to extreme process conditions like high temperatures and the absence of lubricant. Galling is a wear mechanism in the form of adhesive wear in…
View article: On the mechanics of edge cracking and the reliable determination of edge formability limits
On the mechanics of edge cracking and the reliable determination of edge formability limits Open
Blanked edge surfaces are rough and hardened. They therefore lead to inhomogeneous deformation on the edge, which can trigger localization within the shear affected zone (up to few mm from the edge). The size and extent of these phenomena …
View article: Application of an Advanced Friction Model in Hot Stamping Simulations: A Numerical and Experimental Investigation of an A-Pillar Reinforcement Panel from Volvo Cars
Application of an Advanced Friction Model in Hot Stamping Simulations: A Numerical and Experimental Investigation of an A-Pillar Reinforcement Panel from Volvo Cars Open
Although hot stamping is now an established method, numerical analysis of the process is still a challenge. In industrial applications, process engineers use sophisticated models which consider complex physical effects including phase tran…
View article: New press deflection measuring methods for the creation of substitutive models for efficient die cambering
New press deflection measuring methods for the creation of substitutive models for efficient die cambering Open
Cost and time for die tryout are significant within the car industry, and elastic deflections of dies and presses are most commonly not considered during the virtual die design and forming simulation phase. Because of this, active surfaces…
View article: Towards Improving Process Control in Sheet Metal Forming: A Hybrid Data- and Model-Based Approach
Towards Improving Process Control in Sheet Metal Forming: A Hybrid Data- and Model-Based Approach Open
Ability to predict and control involved parameters and hence the outcome of sheet metal forming processes demand holistic knowledge of the product/-process parameter influences and their contribution in shaping the output product quality. …
View article: Accurate sheet metal forming modeling for cost effective automotive part production
Accurate sheet metal forming modeling for cost effective automotive part production Open
Recent implementations of accurate material and tribology models in finite element codes for sheet metal forming process development have the potential to reduce development time and the associated development costs significantly. Adoption…
View article: On the Failure Prediction of Dual-Phase Steel and Aluminium Alloys Exposed to Combined Tension and Bending
On the Failure Prediction of Dual-Phase Steel and Aluminium Alloys Exposed to Combined Tension and Bending Open
The interest in accurate prediction of failure of sheet metals in the automotive industry has increased significantly over the last two decades. This paper aims to evaluate two failure prediction approaches implemented in the commercial Fi…
View article: Simulation of Sheet Metal Forming using Elastic Stamping Dies
Simulation of Sheet Metal Forming using Elastic Stamping Dies Open
Simulation of sheet metal forming is one of the major applications of LS-DYNA. Today, a majority of the forming industry is using Finite Element models to design the stamping dies in order to prevent excessive thinning, wrinkling and produ…
View article: Introductory study of sheet metal forming simulations to evaluate process robustness
Introductory study of sheet metal forming simulations to evaluate process robustness Open
The ability to control quality of a part is gaining increased importance with desires to achieve zero-defect manufacturing. Two significant factors affecting process robustness in production of deep drawn automotive parts are variations in…
View article: Data-driven modelling in the era of Industry 4.0: A case study of friction modelling in sheet metal forming simulations
Data-driven modelling in the era of Industry 4.0: A case study of friction modelling in sheet metal forming simulations Open
With growing demands on quality of produced parts, concepts like zero-defect manufacturing are gaining increasing importance. As one of the means to achieve this, industries strive to attain the ability to control product/process parameter…
View article: Strategies for increasing the accuracy of sheet metal forming finite element models
Strategies for increasing the accuracy of sheet metal forming finite element models Open
Accurate modelling of sheet metal forming can contribute significantly to reduction of lead time and development costs in manufacturing industries. The current way to improve the finite element model accuracy is to combine advanced constit…