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Fabian Welschinger

Fabian Welschinger
Bosch · Department of Corporate Research

About

26
Publications
3,493
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3,052
Citations

Publications

Publications (26)
Article
It is challenging to predict the material degradation and crack initiation of short fiber reinforced thermoplastics (SFRT) components with high computation efficiency and low parameter identification effort. To achieve that, this work utilizes a hybrid method combining micro- and macro-mechanical approaches to describe the damage-coupled material b...
Chapter
Short-fiber reinforced materials show material degradation under fatigue loading prior to failure. To investigate these effects, we model the constituents by an isotropic fatigue damage model for the matrix material and isotropic linear-elastic material model for the fibers. On the microscale we compute the overall material response for cell proble...
Article
Characterizing short-fiber reinforced polymers under high-cycle fatigue loading is a tedious experimental task. To reduce the necessary experiments to a minimum, we introduce a computational strategy involving a mean-stress dependent fatigue-damage model for the stiffness degradation in short-fiber reinforced polymers. The key challenge in these ma...
Article
Under fatigue-loading, short-fiber reinforced thermoplastic materials typically show a progressive degradation of the stiffness tensor. The stiffness degradation prior to failure is of primary interest from an engineering perspective, as it determines when fatigue cracks nucleate. Efficient modeling of this fatigue stage allows the engineer to moni...
Article
Short fiber reinforced thermoplastics (SFRT) are widely used for automotive components. One of the significant challenges in designing industrial SFRT components is an efficient prediction of their mechanical response under mechanical and thermal loads. In this work, an anisotropic temperature-dependent elasto-viscoplastic model is implemented usin...
Article
This paper revisits the topic of mean field homogenization for short fiber reinforced composite materials. A short glass fiber reinforced thermoplastic polyamide 6.6 with a fiber mass fraction of 35% is used as an example material for which microstructural analyses and experimental tests were performed. We cover a set of common models: the Self-Con...
Article
In this work, we investigate a model for the anisotropic and loading-direction dependent stiffness degradation of short-fiber reinforced thermoplastics subjected to high-cycle fatigue loading. Based upon the variational setting of generalized standard materials, we model the stiffness degradation of the matrix in cycle space by a simple isotropic f...
Article
Full-text available
Experimental studies of Chebbi et al. [1] on fatigue loading of fiber‐reinforced polymers have shown that there is a phase of stable stiffness decrease prior to growing fatigue cracks. Modeling this stiffness degradation is an essential step in understanding fatigue effects of these materials. The constitutive behavior of short‐fiber reinforced pol...
Article
As a result of the injection molding process, short glass fiber reinforced thermoplastics (SFRT) exhibit complex microstructures with fibers of different length and orientation as well as spatially varying fiber volume fractions. Their mechanical and functional performance can therefore only be predicted and ensured based on precise knowledge of sa...
Article
To predict the nonlinear mechanical behavior of components made of short fiber-reinforced plastics (SFRP) under long term and cyclic loading, coupled process and component simulations are required. The injection molding process leads to locally varying fiber orientations within the component. This varying microstructure [1] significantly influences...
Article
The effective elastic properties of a short glass fiber reinforced thermoplastic are estimated using different mean field homogenization schemes. The material's inherently complex microstructure is resolved by means of high resolution x‐ray tomography scans and utilizing a single fiber segmentation algorithm. This raw microstructural data is then d...
Conference Paper
Epoxy based polymers are widely used in the semiconductorindustry as thermal or/and electrical interfaces and as encapsulating material. In the automotive industry epoxy molding compounds are often used to protect not only singleIC packages but also the entire electronic control units (ECUs) or power modules. Fracture processes in mold materials us...
Thesis
The thesis addresses the development of a variational-based framework for gradient-type standard dissipative solids. A focus lies on the design of theoretical and computational approaches towards the description of length-scale effects in inelastically deforming solids. A strong emphasis is put on a unifying theoretical and numerical treatment of t...
Article
The computational modeling of failure mechanisms in solids due to fracture based on sharp crack discontinuities suffers in situations with complex crack topologies. This can be overcome by diffusive crack modeling, based on the introduction of a crack phase field as outlined in [1, 2]. Following these formulations, we outline a thermodynamically co...
Article
The computational modeling of failure mechanisms in solids due to fracture based on sharp crack discontinuities suffers in situations with complex crack topologies and for crack initiation in bodies free of defects. This drawback can be overcome by a diffusive crack modeling based on the introduction of a crack phase field. In [1,2], we developed a...
Article
The computational modeling of failure mechanisms in solids due to fracture based on sharp crack discontinuities suffers in situations with complex crack topologies. This can be overcome by a diffusive crack modeling based on the introduction of a crack phase field. Following our recent work [C. Miehe, F. Welschinger, M. Hofacker, Thermodynamically-...
Article
Structural reliability analyses of piezoelectric solids need the modeling of failure under coupled electromechanical actions. However, the numerical simulation of failure due to fracture based on sharp crack discontinuities may suffer in situations with complex crack topologies. This can be overcome by a diffusive crack modeling based on the introd...
Article
The computational modeling of failure mechanisms in solids due to fracture based on sharp crack discontinuities suffers in situations with complex crack topologies. This can be overcome by a diffusive crack modeling based on the introduction of a crack phase-field. In this paper, we outline a thermodynamically consistent framework for phase-field m...
Article
We propose a configurational-force-based framework for h-adaptive finite element discretizations of solids with nonlocal, gradient-type constitutive response. Typical applications are related to gradient-type damage mechanics, strain gradient plasticity and regularized brittle fracture. On the theoretical side, we outline a general incremental vari...
Article
The paper performs a comparative study of variational-based brittle fracture with its gradient-type regularization, and outlines aspects of the numerical implementations of both approaches. The latter smoothes out sharp displacement discontinuities of cracks. On the side of discrete crack modeling, we propose a variational framework of configuratio...
Article
We propose a variational framework for the description of rate–independent nonlocal materials with microstructure and outline details of its numerical implementation. On the theoretical side, we focus on a multifield approach to microstructural dissipative mechanisms. To this end, the current state of the evolving microstructure is described by glo...
Article
We investigate a variational setting of nonlocal materials with microstructure and outline aspects of its numerical implementation. Thereby, the current state of the evolving microstructure is described by independent global degrees in addition to the macroscopic displacement field, so-called order parameters. Focussing on standard-dissipative mate...

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