document

A transientanisotropic gradientenhanced damage model with displacement smoothing for failure analysis in quasibrittle materials

Amani, J. (author)

It is widely recognized in engineering fracture mechanics that integral and differential forms of nonlocal damage models with a constant internal length scale suffer from an incorrect representation of failure mechanisms either by spurious damage growth or by incorrect damage initiation and propagation. In this regard, in this thesis, a...

doctoral thesis 2023

document

Analysis of thermoplastic composites and conduction welded joints

Tijs, B.H.A.H. (author)

Thermoplastic composites enable new manufacturing techniques such as conduction welding to make the aviation industry more sustainable, while at the same time, provide great benefits to cost-efficient high-volume production. One of the benefits of welding is that it reduces the amount of mechanical fasteners required. Fastener-free joining also...

doctoral thesis 2023

document

Heat-affected zone in welded cold-formed rectangular hollow section joints

Yan, R. (author)

High-strength steel (HSS) has higher strength but lower ductility than mild steel. The cross-section of the structural members may be reduced using HSS instead of mild steel, provided the buckling of elements does not govern the failure. The reduced member size benefits the environment and economy by means of less energy consumption, less carbon...

doctoral thesis 2023

document

The importance of accounting for large deformation in continuum damage models in predicting matrix failure of composites

Tijs, B.H.A.H. (author), Dávila, C. G. (author), Turon, A. (author), Bisagni, C. (author)

The work presented in this paper investigates the ability of continuum damage models to accurately predict matrix failure and ply splitting. Two continuum damage model approaches are implemented that use different stress–strain measures. The first approach is based on small-strain increments and the Cauchy stress, while the second approach...

journal article 2023

document

Comparative numerical study to simulate masonry with bed joint reinforced repointing

Ho Lee, Ka (author), Mehrotra, A.A. (author), Esposito, R. (author)

Bed joint reinforced repointing is a retrofitting technique for unreinforced masonry structures that is commonly applied in the Netherlands to repair settlement-induced damage. Using this technique, the bed joints of masonry walls are reinforced with steel rebars that are embedded in a high strength repair mortar. Due to the increase of...

journal article 2023

document

Investigation on the effect of interface properties on compressive failure behavior of 3D woven composites through micromechanics-based multiscale damage model

Zheng, T. (author), Guo, Licheng (author), Sun, Ruijian (author), Wang, Tongtong (author), Hong, Changqing (author), Benedictus, R. (author), Pascoe, J.A. (author)

In this paper, the effect of interface properties on the compressive failure behavior of 3D woven composites (3DWC) is investigated by incorporating a micromechanics-based multiscale damage model (MMDM). The correlation between the mesoscopic stress of yarns and microscopic stress of constituents is established by defining a stress...

journal article 2023

document

Unfolding the Early Fatigue Damage Accumulation for Cross-ply Laminates

Li, X. (author)

Fatigue damage of composite laminates has attracted considerable attention from research community and industry, in view that laminated structures are inevitable to suffer from fatigue loading during their service life. It is rather complicated to understand and explain, what governs the initiation, accumulation, interaction (synergy or...

doctoral thesis 2022

document

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Braun, Moritz (author), Dörner, Alfons (author), ter Veer, Kane F. (author), Willems, Tom (author), Seidel, Marc (author), Hendrikse, H. (author), Høyland, Knut V. (author), Fischer, Claas (author), Ehlers, Sören (author)

Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider the effects of ice loading and its stochastic nature on the...

journal article 2022

document

Experimental and numerical evaluation of conduction welded thermoplastic composite joints

Tijs, B.H.A.H. (author), Doldersum, M.H.J. (author), Turon, A. (author), Waleson, J. E.A. (author), Bisagni, C. (author)

The capability of joining two thermoplastic composite parts by welding is a key technology to reduce the weight and cost of assembled parts and enables high volume manufacturing of future aeronautical structures made of thermoplastic composite materials. However, there is not much experimental understanding of the mechanisms involving welded...

journal article 2022

document

Fracture simulation of welded RHS X-joints using GTN damage model

Yan, R. (author), Xin, Haohui (author), Mela, Kristo (author), El Bamby, H. (author), Veljkovic, M. (author)

A welded rectangular hollow section (RHS) X-joint exposed to tension loading has three typical fracture-related failure modes: Punching shear failure (PSF), Brace failure (BF), and Chord side wall failure (CSWF). Prediction of these failure modes by finite element (FE) simulations requires modelling of the material damage. An appropriate...

journal article 2022

document

Ductile fracture simulation of cold-formed high strength steel using GTN damage model

Yan, R. (author), Xin, Haohui (author), Veljkovic, M. (author)

The use of high strength steel (HSS) cold-formed hollow section is of significant interest in the construction sector due to competitive costs. The accurate simulation of ductile fracture failure at the micro and macro scale is critical for improving the validity of predicting structural behaviour of HSS cold-formed hollow sections and welded...

journal article 2021

document

Push-out behaviour of demountable injected vs. blind-bolted connectors in FRP decks

Csillag, Fruzsina (author), Pavlovic, M. (author)

The main challenge for realizing competitive hybrid steel-FRP structures, such as bridges, carparks, is to make the steel and FRP components work together. In this study shear resistance, stiffness and ductility of three types of demountable bolted shear connectors are examined. Two blind-bolted M20 shear connectors and a novel, injected...

journal article 2021

document

Fracture simulation of a demountable steel-concrete bolted connector in push-out tests

Yang, F. (author), Liu, Yuqing (author), Xin, H. (author), Veljkovic, M. (author)

Many bolted connectors were proposed for use in steel-concrete composite structures over the past few decades. This is because using bolted connectors could make the assembly and disassembly of steel-concrete composite structures more convenient and reusing the dismantled structural components could also improve structural sustainability. Lots...

journal article 2021

document

Deducing the physical characteristics of an impactor from the resultant damage on aircraft structures

Massart, Philippe F.R. (author), Dhanisetty, V.S.V. (author), Kassapoglou, C. (author), Verhagen, W.J.C. (author), Curran, R. (author)

This paper proposes an analytical model that uses historical damage dimension data to deduce physical impactor characteristics (size and energy) that has caused a certain resulting damage. Maintenance tasks occur in operations due to impact, however the source of the damage caused in the event remains in most cases unknown. Consequently, by...

journal article 2020

document

Ductile damage model calibration for high-strength structural steels

Yang, F. (author), Veljkovic, M. (author), Liu, Yuqing (author)

Numerical analyses incorporating appropriate damage models provide an opportunity to predict the strength and deformation capacity of steel structures. This paper presents a practical calibration for the ductile damage model of S355 and high-strength steel S690Q, S700MC, S960Q based on tensile coupon test results. A combined linear and power...

journal article 2020

document

Switch Panel Structural Performance (SP2)

Hiensch, E.J.M. (author)

doctoral thesis 2019

document

From sequentially linear analysis to incremental sequentially linear analysis: Robust algorithms for solving the non-linear equations of structures of quasi-brittle materials

Yu, C. (author)

It is difficult to accurately predict the strength of masonry and concrete structures. The most widely used method for simulating their behaviour is finite element analysis with the Newton-Raphson method and arch length control. However, the Newton-Raphson method can diverge and not produce a result, for example in bifurcations or during snap...

doctoral thesis 2019

document

Fatigue crack initiation prediction using phantom nodes-based extended finite element method for S355 and S690 steel grades

Xin, H. (author), Veljkovic, M. (author)

The assessment of fatigue crack initiation behavior of steel structures is essential and important especially to improve the application of high strength steel in construction. For a complete understanding of fatigue endurance, it is necessary to combine the phenomenological damage model with finite element numerical approach. In this paper,...

journal article 2019

document

Moisture damage susceptibility of asphalt mixtures: Experimental characterization and modelling

Varveri, Aikaterini (author)

A well-functioning, long-lasting and safe highway infrastructure network ensures the mobility of people and facilitates the transport of goods, promoting thus environmental, economic, and social sustainability. The development of sustainable highway infrastructure requires, among other activities, the construction of pavement systems with...

doctoral thesis 2017

document

Macroscopic modelling of self-healing thermoset materials

Mergheim, J. (author), Steinmann, P. (author)

The present contribution introduces a phenomenological model for self-healing polymers. Self-healing polymers are a promising class of materials which mimic nature by its capability to autonomously heal micro-cracks. Self-healing in the here considered system is accomplished by integrating microcapsules filled with a healing agent and a...

conference paper 2013