Local Buckling-Induced Forming Method to Produce Metal Bellows

Zhang, Tianyin; Li, Dongqing; Xu, Tianjiao; Sui, Y F; Han, Xianhong

doi:10.1186/s10033-023-00852-2

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…These values are significantly lower than those of bulk Cu (~ 400 W/mK) and Cu-12 wt.% graphene (~ 525 W/mK) processed by spark-plasma sintering [15]. The significantly lower values are attributed to the thermal contact resistance between each powder particle along the heat conduction path [16]. Typically reported thermal contact resistances between Cu to Cu particles are in the range of ~10 -4 ~ 10 -5 m 2 K/W, while between graphite to graphite this is in the range of ~10 -5 m 2 K/W under ambient pressure [17].…”

Section: Resultsmentioning

confidence: 98%

Measurement of effective thermal conductivity of composite powders of 2D materials and metals for additive manufacturing

Lee,

Koutsioukis,

Jafari

et al. 2024

J. Phys.: Conf. Ser.

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Laser Powder Bed Fusion (LPBF), a promising additive manufacturing technique for composites of 2D materials and metals, requires knowledge of thermophysical properties, such as the thermal conductivity of powder, for process optimization. In this study, we measured the effective thermal conductivity of the most representative Cu-graphene composite powder in the field of heat transfer applications. To measure thermal conductivity, we propose a differential scanning calorimetry (DSC) method to measure the thermal resistances of a powder bed under steady-state heat flow conditions. We observe that the thermal conductivity of a composite powder is 1,000 times lower than that of the bulk metal without 2D material addition; e.g., exhibiting ~ 0.30 W/mK in Cu-1wt.% graphene powder. Furthermore, we discuss powder size and morphology impact on thermal conductivity influencing the number of contact points and thermal contact resistance. Our findings contribute to understanding the thermal conductivity of composite powders in a powder bed and aid in optimizing LPBF processes.

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Section: Resultsmentioning

confidence: 98%

Measurement of effective thermal conductivity of composite powders of 2D materials and metals for additive manufacturing

Lee,

Koutsioukis,

Jafari

et al. 2024

J. Phys.: Conf. Ser.

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“…If the material properties, loading conditions, and geometric structures are different, the principal stress states suffered are different in plastic instability. The deformation instability of metal materials will be manifested in the form of local necking [ 3 , 4 , 5 ], buckling [ 6 , 7 , 8 ], wrinkling [ 9 , 10 , 11 ], etc. Since there are different process parameters, such as forming temperature, friction conditions, forming equipment, process route, etc., the change law of the same instability characteristic is also different.…”

Section: Introductionmentioning

confidence: 99%

Theory, Method and Practice of Metal Deformation Instability: A Review

Wan

Yao

et al. 2023

Materials

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Deformation instability is a macroscopic and microscopic phenomenon of non-uniformity and unstable deformation of materials under stress loading conditions, and it is affected by the intrinsic characteristics of materials, the structural geometry of materials, stress state and environmental conditions. Whether deformation instability is positive and constructive or negative and destructive, it objectively affects daily life at all times and the deformation instability based on metal-bearing analysis in engineering design has always been the focus of attention. Currently, the literature on deformation instability in review papers mainly focuses on the theoretical analysis of deformation instability (instability criteria). However, there are a limited number of papers that comprehensively classify and review the subject from the perspectives of material characteristic response, geometric structure response, analysis method and engineering application. Therefore, this paper aims to provide a comprehensive review of the existing literature on metal deformation instability, covering its fundamental principles, analytical methods, and engineering practices. The phenomenon and definition of deformation instability, the principle and viewpoint of deformation instability, the theoretical analysis, experimental research and simulation calculation of deformation instability, and the engineering application and prospect of deformation instability are described. This will provide a reference for metal bearing analysis and deformation instability design according to material deformation instability, structural deformation instability and localization conditions of deformation instability, etc. From the perspective of practical engineering applications, regarding the key problems in researching deformation instability, using reverse thinking to deduce and analyze the characteristics of deformation instability is the main trend of future research.

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Numerical Simulation of Mechanical Bulging Process of a Large Three-Layer Rectangular Bellow

Jiang,

Meng,

et al. 2024

Springer Proceedings in Mathematics &Amp; Statistics

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Local Buckling-Induced Forming Method to Produce Metal Bellows

Cited by 5 publications

References 20 publications

Measurement of effective thermal conductivity of composite powders of 2D materials and metals for additive manufacturing

Measurement of effective thermal conductivity of composite powders of 2D materials and metals for additive manufacturing

Theory, Method and Practice of Metal Deformation Instability: A Review

Numerical Simulation of Mechanical Bulging Process of a Large Three-Layer Rectangular Bellow

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