Author
Thomas Feser
Bio: Thomas Feser is an academic researcher from German Aerospace Center. The author has contributed to research in topics: Bolted joint & Bearing (mechanical). The author has an hindex of 6, co-authored 14 publications receiving 91 citations.
Papers
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TL;DR: In this article, a numerical simulation method to appropriately represent relevant failure mechanisms of carbon fiber reinforced plastic (CFRP) components subjected to dynamic crash loads is presented. And the capability of current state-of-the-art technologies for the simulation of progressive crushing is identified.
33 citations
TL;DR: In this article, two continuum damage models with different underlying assumptions are investigated to assess their predictive capabilities and limitations with respect to progressive intra-laminar damage in notched IM7/8552 CFRP composite laminates under tension.
33 citations
TL;DR: In this article, experimental as well as numerical studies on two different crashworthy designs are presented, and the first concept aims to absorb the crash energy by crushing of CFRP components below a reinforced cargo cross beam in combination with further energy absorbing devices in the lower side shell.
Abstract: Due to their inherently brittle behaviour, carbon fibre reinforced plastics (CFRP) structures demand for a specific design to achieve appropriate crash energy absorption compared to classical metallic fuselage designs. In this paper, experimental as well as numerical studies on two different crashworthy designs are presented. The first concept aims to absorb the crash energy by crushing of CFRP components below a reinforced cargo cross beam in combination with further energy absorbing devices in the lower side shell. The feasibility of this concept was in the meantime proven by tests at the coupon and structural element level. An alternative crash concept making use of energy absorption in so-called tension absorbers in the passenger and cargo floor structure was developed and assessed with the focus on a reduction of structural mass in combination with improved concept robustness. This paper provides a summary of the performed research work and discusses the context of the concept development. De...
18 citations
TL;DR: In this paper, the authors investigate three different material models based on continuum damage mechanics (CDM) within two commercial finite element (FE) software packages, ABAQUS/EXPLICIT and LS-DYNA, to identify FE-code and material model-independent capabilities, limitations and challenges of physically-based axial crush simulation of composite structures without the use of non-physical parameters for model calibration.
Abstract: The finite element (FE) simulation of industrial size composite structures under crush loading is a challenging task. Currently, the vast majority of these simulations employ non-physical “tweaking” parameters that are undesirable and limit the confidence in their predictive capabilities. This paper investigates three different material models based on continuum damage mechanics (CDM) within two commercial FE software packages, ABAQUS/EXPLICIT and LS-DYNA, to identify FE-code and material model-independent capabilities, limitations and challenges of physically-based axial crush simulation of composite structures without the use of non-physical parameters for model calibration. In particular, we show that the commonly applied crack band scaling in CDM-based material models is not suitable for the simulation of axial crushing where the dominant mode of failure is fragmentation.
14 citations
TL;DR: In this paper, experimental tests are performed on pin-loaded joints in a widely-used carbon fiber/epoxy composite, with varying stacking sequence, pin diameter and laminate thickness.
11 citations
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TL;DR: In this paper, a series of experimental tests are carried out to explore the crushing behaviors of hybrid tubes in comparison with the corresponding individual tubes made of single material, and numerical simulations are performed for the H-II hybrid tubes to provide further insights into their underlying energy-absorbing mechanisms.
100 citations
TL;DR: A novel approach for damage characterization through machine learning is presented where theoretical knowledge of failure and strain-softening is linked to the macroscopic response of quasi-isotropic composite laminates in over-height compact tension tests, demonstrating the effectiveness of machine learning to reduce experimental efforts forDamage characterization in composites.
67 citations
TL;DR: In this article, the impact behavior of composite adhesive joints with ductile epoxy adhesive was investigated under quasi-static and impact conditions, and numerical models were developed with cohesive elements in ABAQUS® software.
59 citations
TL;DR: In this paper, an innovative chamfer external trigger was introduced to guide the 2D braided tube to make the material fully destroyed in the impact process, the innovative trigger restricts the space of tube under compression by a semi-circle cavity.
51 citations
TL;DR: In this article, the authors developed a numerical framework for the simulation of damage in composite structures using explicit time integration, where Lagrange polynomials are used to represent the displacement field through the thickness of each ply, resulting in a layer-wise element model.
Abstract: The objective of the current work is the development of a numerical framework for the simulation of damage in composite structures using explicit time integration. The progressive damage is described using a Continuum Damage Mechanics (CDM) based material model, CODAM2, in which the damage initiation and progression are modelled using Hashin's failure criteria and crack-band theory, respectively. The structural modelling uses higher-order theories based on the Carrera Unified Formulation (CUF). The current work considers 2D-CUF models where Lagrange polynomials are used to represent the displacement field through the thickness of each ply, resulting in a layer-wise element model. Numerical assessments are performed on coupon-level specimens, and the results are shown to be in good agreement with reference numerical predictions and experimental data, thus verifying the current implementation for progressive tensile damage. The capability of the proposed framework in increasing the polynomial expansion order through the ply thickness, and its influence on the global behaviour of the structure in the damaged state, is demonstrated. The advantages of using higher-order structural models in achieving significant improvements in computational efficiency are highlighted.
37 citations