Browsing by Autor "Lisa Scheunemann"

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A numerical study of the effect of phase evolution on residual stresses during cooling
(Wiley, 2021) Sonja Uebing; Dominik Brands; Lisa Scheunemann; Jörg Schröder
Abstract The consideration of residual stresses in forming processes is a promising opportunity to influence the final component's properties in a positive manner. Instead of their minimization, a targeted application of residual stresses can extend life time or durability and enhance manufacturability of metallic components. For this reason, detailed experimental and numerical analyses are an object of current research. Here, the cooling process is simulated in order to analyze the influence of the microscopic phase evolution on the macroscopic stress distribution in a cylinder with eccentric hole made of steel 100Cr6.
Numerical analysis of residual stresses on microscale and mesoscale in hot bulk forming parts under specific cooling
(Wiley, 2019) Sonja Uebing; Dominik Brands; Lisa Scheunemann; Mohammad Sarhil; Rainer Niekamp; Christoph Kock; Alexander Chugreev; Bernd‐Arno Behrens; Jörg Schröder
Abstract The adjustment of targeted residual stress states is important in order to improve the properties of a component. Here, especially hot forming processes offer a meaningful potential since a number of parameters such as deformation state, temperature profile or cooling media can be adapted independently. This publication presents first simulation steps for the calculation of residual stresses on microscale and mesoscale. As a first application, the microscopic phase transformation from austenite to martensite due to a cooling process is considered. The arising mesoscopic eigenstrain distributions are used in the solution of an elasto‐plastic two‐scale boundary value problem to gain resulting residual stress states.
On the evolution of residual stresses due to cooling considering martensitic phase transformation
(Wiley, 2021) Sonja Uebing; Dominik Brands; Lisa Scheunemann; Jörg Schröder
Abstract The direct consideration of residual stresses can positively influence the properties of a component and offers a new perspective compared to the typical strategy of avoiding residual stresses. Instead of minimizing residual stresses in forming processes, their consideration can positively influence the properties of the final component. For instance, the targeted adjustment of residual stresses can extend the service life or durability and improve the manufacturability of metal components. This is investigated in current research using experimental and numerical analyses on a cylindrical component with eccentric hole made of steel 100Cr6. Here, the cooling process after hot bulk forming is simulated to analyze the influence of microscopic phase evolution on the macroscopic stress distribution. For this purpose, different variants of the microstructural evolution described by a random process are compared.