Two-Scale Thermomechanical Simulation of Hot Stamping

Two-Scale Thermomechanical Simulation of Hot Stamping
Author: Neumann, Rudolf
Publisher: KIT Scientific Publishing
Total Pages: 270
Release: 2017-10-27
Genre: Technology (General)
ISBN: 3731507145

Hot stamping is a hot drawing process which takes advantage of the polymorphic steel behavior to produce parts with a good strength-to-weight ratio. For the simulation of the hot stamping process, a nonlinear two-scale thermomechanical model is suggested and implemented into the FE tool ABAQUS. Phase transformation and transformation induced plasticity effects are taken into account. The simulation results regarding the final shape and residual stresses are compared to experimental findings.

Deep material networks for efficient scale-bridging in thermomechanical simulations of solids

Deep material networks for efficient scale-bridging in thermomechanical simulations of solids
Author: Gajek, Sebastian
Publisher: KIT Scientific Publishing
Total Pages: 326
Release: 2023-08-25
Genre:
ISBN: 3731512785

We investigate deep material networks (DMN). We lay the mathematical foundation of DMNs and present a novel DMN formulation, which is characterized by a reduced number of degrees of freedom. We present a efficient solution technique for nonlinear DMNs to accelerate complex two-scale simulations with minimal computational effort. A new interpolation technique is presented enabling the consideration of fluctuating microstructure characteristics in macroscopic simulations.

Thermomechanical Modeling and Experimental Characterization of Sheet Molding Compound Composites

Thermomechanical Modeling and Experimental Characterization of Sheet Molding Compound Composites
Author: Lang, Juliane
Publisher: KIT Scientific Publishing
Total Pages: 250
Release: 2023-06-28
Genre:
ISBN: 3731512327

The aim of this work is to model and experimentally characterize the anisotropic material behavior of SMC composites on the macroscale with consideration of the microstructure. Temperature-dependent thermoelastic behavior and failure behavior are modeled and the corresponding material properties are determined experimentally. Additionally, experimental biaxial damage investigations are performed. A parameter identification merges modeling and experiments and validates the models.

Thermomechanical Mean-Field Modeling and Experimental Characterization of Long Fiber-Reinforced Sheet Molding Compound Composites

Thermomechanical Mean-Field Modeling and Experimental Characterization of Long Fiber-Reinforced Sheet Molding Compound Composites
Author: Kehrer, Maria Loredana
Publisher: KIT Scientific Publishing
Total Pages: 204
Release: 2019-06-13
Genre: Technology & Engineering
ISBN: 3731509245

A discontinuous fiber-reinforced thermoset material produced by the Sheet Molding Compound process is investigated. Due to the process-related fiber orientation distribution, a composite with an anisotropic microstructure is created which crucially affects the mechanical properties. The central objectives are the modeling of the thermoelastic behavior of the composite accounting for the underlying microstructure, and the experimental characterization of the pure resin and the composite material.

Modeling martensitic phase transformation in dual phase steels based on a sharp interface theory

Modeling martensitic phase transformation in dual phase steels based on a sharp interface theory
Author: Ruck, Johannes
Publisher: KIT Scientific Publishing
Total Pages: 220
Release: 2021-05-07
Genre: Technology & Engineering
ISBN: 3731510723

artensite forms under rapid cooling of austenitic grains accompanied by a change of the crystal lattice. Large deformations are induced which lead to plastic dislocations. In this work a transformation model based on the sharp interface theory, set in a finite strain context is developed. Crystal plasticity effects, the kinetic of the singular surface as well as a simple model of the inheritance from austenite dislocations into martensite are accounted for.

A computational multi-scale approach for brittle materials

A computational multi-scale approach for brittle materials
Author: Ernesti, Felix
Publisher: KIT Scientific Publishing
Total Pages: 264
Release: 2023-04-17
Genre: Technology & Engineering
ISBN: 3731512858

Materials of industrial interest often show a complex microstructure which directly influences their macroscopic material behavior. For simulations on the component scale, multi-scale methods may exploit this microstructural information. This work is devoted to a multi-scale approach for brittle materials. Based on a homogenization result for free discontinuity problems, we present FFT-based methods to compute the effective crack energy of heterogeneous materials with complex microstructures.

Biaxial Characterization and Mean-field Based Damage Modeling of Sheet Molding Compound Composites

Biaxial Characterization and Mean-field Based Damage Modeling of Sheet Molding Compound Composites
Author: Schemmann, Malte
Publisher: KIT Scientific Publishing
Total Pages: 194
Release: 2018-11-09
Genre: Automobile industry and trade
ISBN: 3731508184

The focus of this work lies on the microstructure-based modeling and characterization of a discontinuous fiber-reinforced thermoset in the form of sheet molding compound (SMC). A microstructure-based parameter identification scheme for SMC with an inhomogeneous fiber orientation distribution is introduced. Different cruciform specimen designs, including two concepts to reinforce the specimens' arms are evaluated. Additionally, a micromechanical mean-field damage model for the SMC is introduced.

Homogenization and materials design of mechanical properties of textured materials based on zeroth-, first- and second-order bounds of linear behavior

Homogenization and materials design of mechanical properties of textured materials based on zeroth-, first- and second-order bounds of linear behavior
Author: Lobos Fernández, Mauricio
Publisher: KIT Scientific Publishing
Total Pages: 224
Release: 2018-07-09
Genre: Materials
ISBN: 3731507706

This work approaches the fields of homogenization and of materials design for the linear and nonlinear mechanical properties with prescribed properties-profile. The set of achievable properties is bounded by the zeroth-order bounds (which are material specific), the first-order bounds (containing volume fractions of the phases) and the second-order Hashin-Shtrikman bounds with eigenfields in terms of tensorial texture coefficients for arbitrarily anisotropic textured materials.

Finite Element Simulation of Hot Stamping

Finite Element Simulation of Hot Stamping
Author: Deepak Ravindran
Publisher:
Total Pages: 37
Release: 2011
Genre:
ISBN:

Abstract: Hot stamping is a relatively new and upcoming technology in the automotive industry used for the manufacturing of lightweight crash resistant parts with ultra high strength. The Finite Element (FE) simulation of hot stamping has to consider the combined effects of thermal, mechanical and microstructural fields. As a result, simulation of hot stamping is a complex process and requires detailed information on various factors such as material properties, process parameters and the right choice of software code. This report presents a complete list of all the important material properties and process parameters required for FE simulation of hot stamping. A sample part geometry was obtained from an industrial partner of the Center for Precision Forming at The Ohio State University and FE simulations of the part were carried out using the FE code DEFORM. The modeling and results of these simulations are presented in this report. Based on the results, a new methodology has been proposed that makes use of two different FE codes namely, DEFORM and PAM-STAMP in order to combine the advantages of the two in simulating hot stamping processes.

Comprehensive Materials Processing

Comprehensive Materials Processing
Author:
Publisher: Newnes
Total Pages: 5485
Release: 2014-04-07
Genre: Technology & Engineering
ISBN: 0080965334

Comprehensive Materials Processing, Thirteen Volume Set provides students and professionals with a one-stop resource consolidating and enhancing the literature of the materials processing and manufacturing universe. It provides authoritative analysis of all processes, technologies, and techniques for converting industrial materials from a raw state into finished parts or products. Assisting scientists and engineers in the selection, design, and use of materials, whether in the lab or in industry, it matches the adaptive complexity of emergent materials and processing technologies. Extensive traditional article-level academic discussion of core theories and applications is supplemented by applied case studies and advanced multimedia features. Coverage encompasses the general categories of solidification, powder, deposition, and deformation processing, and includes discussion on plant and tool design, analysis and characterization of processing techniques, high-temperatures studies, and the influence of process scale on component characteristics and behavior. Authored and reviewed by world-class academic and industrial specialists in each subject field Practical tools such as integrated case studies, user-defined process schemata, and multimedia modeling and functionality Maximizes research efficiency by collating the most important and established information in one place with integrated applets linking to relevant outside sources