The challenges in predicting the fatigue life of dissimilar brazed joints and initial finite element results for a tungsten to EUROFER97 steel brazed joint

Hamilton, Niall Robert; Robbie, Mikael Brian Olsson; Wood, JodiAnne T.; Galloway, Alexander; Katramados, Ioannis; Milnes, J.

doi:10.1016/j.fusengdes.2011.04.027

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…The stresses are not symmetric because of the constraint on the bottom surface, which is similar to that found by Hamilton N.R. et al [24]. The result proves that the present FEM is right and can be used to predict the residual stress in the complex lattice truss sandwich structure.…”

Section: Resultssupporting

confidence: 85%

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Comparison of Brazed Residual Stress and Thermal Deformation between X-Type and Pyramidal Lattice Truss Sandwich Structure: Neutron Diffraction Measurement and Simulation Study

Jiang¹,

Wei

Luo

et al. 2015

High Temperature Materials and Processes

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This paper uses finite element method and neutron diffraction measurement to study the residual stress in lattice truss sandwich structure. A comparison of residual stress and thermal deformation between X-type and pyramidal lattice truss sandwich structure has been carried out. The residual stresses are concentrated in the middle joint and then decreases gradually to both the ends. The residual stresses in the X-type lattice truss sandwich structure are smaller than those in pyramidal structure. The maximum longitudinal and transverse stresses of pyramidal structure are 220 and 202 MPa, respectively, but they decrease to 190 and 145 MPa for X-type lattice truss sandwich structure, respectively. The thermal deformation for lattice truss sandwich panel structure is of wave shape. The X-type has a better resistance to thermal deformation than pyramidal lattice truss sandwich structure. The maximum wave deformation of pyramidal structure (0.02 mm) is about twice as that of X-type (0.01 mm) at the same brazing condition.

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Section: Resultssupporting

confidence: 85%

“…With the development of computer technology, finite element method (FEM) has been widely used to predict the residual stress distribution in the brazing structure [24].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Brazed Residual Stress and Thermal Deformation between X-Type and Pyramidal Lattice Truss Sandwich Structure: Neutron Diffraction Measurement and Simulation Study

Jiang¹,

Wei

Luo

et al. 2015

High Temperature Materials and Processes

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“…Whilst to fully capture the stress state in a real dissimilar material joint the brazed layer and joining process must be accounted for [18], a simple joint approximation with an abrupt interface between two dissimilar materials can still be informative in terms of gaining an understanding of the features of the stress field in the region of a dissimilar material interface and the key relationships in material properties driving the mechanics and hence failure in the joint. The stress state at the interface of an abrupt change in material properties using both a theoretical approach and finite element analysis (FEA) has been the topic of much previous research [19][20][21]; however it is pertinent to understand the key features of the stress state that will form of the basis of future discussion.…”

Section: Stress State In An Elastic Dissimilar Materials Jointmentioning

confidence: 99%

“…When trying to predict the stress in real dissimilar material joint the residual stresses due to joint manufacture will have to be taken into account [18,33]. The presence of these residual stresses has been the topic of previous research [12,15,33] and stress relief will be problematic due to the mechanical properties of the adjoined materials.…”

Section: Manufacturing Residual Stressesmentioning

confidence: 99%

The metallurgy, mechanics, modelling and assessment of dissimilar material brazed joints

Hamilton

Wood

Galloway

et al. 2013

Journal of Nuclear Materials

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At the heart of any procedure for modelling and assessing the design or failure of dissimilar material brazed joints there must be a basic understanding of the metallurgy and mechanics of the joint. This paper is about developing this understanding and addressing the issues faced with modelling and predicting failure in real dissimilar material brazed joints and the challenges still to be overcome in many cases. An understanding of the key metallurgical features of such joints in relation to finite element modelling is presented in addition to a study of the mechanics and stress state at an abrupt interface between two materials. A discussion is also presented on why elastic singularities do not exist based on a consideration of the assumption of an abrupt change in material properties and plasticity in the vicinity of the joint. In terms of modelling real dissimilar material brazed joints; there are several barriers to accurately capturing the stress state in the region of the joint and across the brazed layer and these are discussed in relation to a metallurgical study of a real dissimilar material brazed joint. However, this does not preclude using a simplified modelling approach with a representative braze layer in design and failure assessment away from the interface. In addition modelling strategies and techniques for assessing the various failure mechanisms of dissimilar material brazed joints are discussed. The findings from this paper are applicable to dissimilar material brazed joints found in a range of applications; however the references listed are primarily focused on work in fusion research and development

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“…Tungsten and its alloys tend to cause incomplete fusion during fusion welding because of their high melting point and thermal conductivity. The joining of tungsten alloys has been achieved by several procedures: brazing [5,6,7], diffusion bonding [8,9,10] and laser brazing [11]. Among them, high temperature brazing seems to be the most suitable method because of its limited influence on properties of base materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal

Qiu

Ruan

et al. 2019

Materials

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In this paper, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD) were used to comprehensively analyze the microstructure and brazing performance of a CuAgTi filler metal with braze tungsten heavy alloys. The association of microstructure, wettability and shear strength of brazing joints was also investigated. With the addition of Ti, the Ti3Cu4 phase appeared in the microstructure of filler metal. Ti is active element that promotes the reaction of filler with tungsten. Therefore, the Ti element is enriched around tungsten and forms a Ti2Cu layer at the interface, leaving a Cu-rich/Ti-poor area on the side. Remaining Ti and Cu elements form the acicular Ti3Cu4 structure at the center of the brazing zone. The wettability of filler metal is improved, and the spreading area is increased from 120.3 mm2 to 320.9 mm2 with the addition of 10 wt.% Ti. The shear strength of joint reaches the highest level at a Ti content of 2.5 wt.%, the highest shear strength is 245.6 MPa at room temperature and 142.2 MPa at 400 °C.

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The challenges in predicting the fatigue life of dissimilar brazed joints and initial finite element results for a tungsten to EUROFER97 steel brazed joint

Cited by 9 publications

References 19 publications

Comparison of Brazed Residual Stress and Thermal Deformation between X-Type and Pyramidal Lattice Truss Sandwich Structure: Neutron Diffraction Measurement and Simulation Study

Comparison of Brazed Residual Stress and Thermal Deformation between X-Type and Pyramidal Lattice Truss Sandwich Structure: Neutron Diffraction Measurement and Simulation Study

The metallurgy, mechanics, modelling and assessment of dissimilar material brazed joints

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal

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