Simulation of ductile fracture in welded tubular connections using a simplified damage plasticity model considering the effect of stress triaxiality and Lode angle

Ma, Xinxu; Wang, Wei; Chen, Yiyi; Qian, Xudong

doi:10.1016/j.jcsr.2015.07.023

Cited by 29 publications

(9 citation statements)

References 29 publications

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“…For S690 steel, a=0.040, b=0.800 and c=2.500 were used. Since the net section resistance of all the specimens was dominated by tensile failure of the material near the bolt hole, the adopted fracture model excluding the influence of lode angle [38][39][40], which quantifies the influence of the shear action on the fracture behaviour, is reasonable. To determine the damage-evolution index, a linear method was assumed to simulate the material deterioration until complete stiffness loss.…”

Section: Modelling Techniquesmentioning

confidence: 99%

Net section resistance of bolted S690 steel angles subjected to tension

Yam

Jiang

et al. 2020

Thin-Walled Structures

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Section: Modelling Techniquesmentioning

confidence: 99%

Net section resistance of bolted S690 steel angles subjected to tension

Yam

Jiang

et al. 2020

Thin-Walled Structures

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“…Ma et al [86] proposed a modification of the Xue model [87] based on damage plasticity, which takes into account shear loading, and applied it to the tubular connections, Figure 15. The authors propose a simplified calibration procedure for the model, aimed at more convenient engineering usage.…”

Section: Application Of Micromechanical Models In Fracture Analysis Of Welded Structuresmentioning

confidence: 99%

“…It is worth mentioning that this simplification is motivated by the Rice-Tracey approach [24], which once again proves its importance and applicability almost 50 years after publication. The authors state that they successfully predicted the sequence of failure, which is observed in the welded connection during the experiments, [86]. In a recent article, Liu et al [88] considered the fracture of tubular welded joints (similar configuration as the one shown in Figure 15, left-hand side) using a modification of the GTN model which takes into account void shearing.…”

Section: Application Of Micromechanical Models In Fracture Analysis Of Welded Structuresmentioning

confidence: 99%

An overview of application of micromechanical models in ductile fracture analysis of welded joints

Rakin

Medjo

Gubeljak

et al. 2020

Theor appl mech (Belgr)

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Fracture of welded joints has been an important research and industrial topic for a long time, having in mind the key role of welded joints in ensuring the safe operation and integrity of welded structures. This work contains an overview of application of micromechanical models to ductile fracture of welded joints. The main benefit of these models, in comparison with the classical fracture mechanics approach, is consideration of the local quantities (stress and strain) in prediction of damage development. The damage is quantified through the value of the damage parameter, which is typically related to the void nucleation, growth and coalescence for ductile fracture of metallic materials, i.e. the description of the material can be related to the actual material behaviour during fracture. Most of the presented studies, including those published by the present authors, are performed on steel as the base material, and the rest deal with aluminium alloys.

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“…Yan et al (2022a) found that neither C f nor the 0.8 f u restriction is necessary for designing HSS rectangular hollow section (RHS) X-joints in tension based on the experimental data presented in (Becque and Wilkinson, 2017; Björk and Saastamoinen, 2012; Feldmann et al, 2016; Tuominen and Björk, 2017; Yan et al, 2022a). The mechanical behaviour of joints beyond the experimental configuration is commonly studied using a verified finite element (FE) model (Björk and Saastamoinen, 2012; Huang et al, 2021; Kim et al, 2019; Lan et al, 2019, 2021; Lee and Kim, 2018; Lee et al, 2017; Liu et al, 2018; Ma et al, 2015; Mohan and Wilkinson, 2022; Tuominen and Björk, 2017; Xin et al, 2021). As the joints fail by a fracture in the heat-affected zone (HAZ) or in the base material (BM), it is essential to conduct an advanced numerical study considering both the stress-strain relationship of HAZ and the material damage model.…”

Section: Introductionmentioning

confidence: 99%

“…Different damage models have been implemented in the fracture simulation of welded joints in recent years (Huang et al, 2021; Liu et al, 2018; Ma et al, 2015; Mohan and Wilkinson, 2022; Xin and Veljkovic, 2021). Ma et al (2015) extended a damage-mechanics-based model to predict PSF in hollow section joints, considering the effect of the stress triaxiality and the Lode angle.…”

Section: Introductionmentioning

confidence: 99%

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

Yan

Xin

Mela

et al. 2022

Advances in Structural Engineering

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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 damage model accurately predicts the behaviour of the fracture zone and provides the necessary information to improve design rules for welded high-strength steel (HSS) RHS X-joints based on parametric studies using validated model. In this paper, the parameters of the Gurson-Tvergaard-Needleman (GTN) damage model are calibrated for the base material (BM) and the heat-affected zone (HAZ) of butt-welded cold-formed RHS connections, no fracture appeared in the weld. A computational homogenisation analysis is carried out using representative volume element (RVE) models to calibrate the pressure-dependent yield surface parameters of the GTN damage model, considering the different combinations of the accumulated initial hardening strain and the void volume fraction (VVF) due to a varying stress triaxiality. The critical and final VVFs are calibrated against tensile coupon tests. Finally, the GTN damage models calibrated for BM and HAZ are used in the fracture simulation of nine welded cold-formed RHS X-joints in monotonic tension. The FE model successfully predicts the experimental load-displacement relationships and fractured zone, indicating the calibrated GTN models could effectively be used in parametric study of welded cold-formed RHS X-joints. Finally, possible improvements to the used FE model are outlined for future studies.

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Simulation of ductile fracture in welded tubular connections using a simplified damage plasticity model considering the effect of stress triaxiality and Lode angle

Cited by 29 publications

References 29 publications

Net section resistance of bolted S690 steel angles subjected to tension

Net section resistance of bolted S690 steel angles subjected to tension

An overview of application of micromechanical models in ductile fracture analysis of welded joints

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

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