Dimensional analysis of superplastic bulge forming

García-Barrachina, L.; Gámez, Antonio J.; Marcos, M.

doi:10.1016/j.promfg.2017.09.020

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…The HHCRSP might be seen as an extension of vehicle routing problem (VRP) augmented by many unusual side constraints that are specific to the HHD context (Cissé et al , 2017). Consequently, it is unlikely that a single standard version modeling the HHCRSP will be suitable to the wide spectrum of situations posed by the health-care systems, which might be partially explained by the many differences existing across countries' policies and regulations (Grenouilleau et al , 2019; Emiliano et al , 2017).…”

Section: Related Research Workmentioning

confidence: 99%

“…To the best of the authors' knowledge, the HHCRSP was first considered by Fernandez et al (1974), who investigated the daily routing of nurses in a rural county in the UK. Nowadays, the HHCRSP is often divided into several levels, where decisions are separated into strategic, tactical and operational (Gutiérrez and Vidal, 2013; Maya Duque et al , 2015; Emiliano et al , 2017). In general, it can be said that the HHCRSP often mixes the design of the health-care providers and services network, decisions about staff dimensioning and workforce scheduling problems, with some form of routing that might span several time periods (Castillo-Salazar et al , 2016).…”

Section: Related Research Workmentioning

confidence: 99%

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A network flow-based model for operations planning in home health care delivery

Castaño

Velasco

2020

IJLM

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PurposeTo solve the problem, a mathematical model is proposed; it relies on a directed acyclic graph (DAG), in which arcs are used to indicate whether a pair of appointments can be assigned to the same route or not (and so to the same care worker). The proposed model aims at minimizing the personnel required to meet daily demand and balancing workloads among the workers while considering the varying traffic patterns derived from traffic congestion.Design/methodology/approachThis paper aims at providing solution approaches for addressing the problem of assigning care workers to deliver home health-care (HHC) services, demanding different skills each. First, a capacity planning problem is considered, where it is necessary to define the number of workers required to satisfy patients' requests and then, patients are assigned to the care workers along with the sequence followed to visit them, thus solving a scheduling problem. The benefits obtained by permitting patients to propose multiple time slots where they can be served are also explored.FindingsThe results indicate that the problem can be efficiently solved for medium-sized instances, that is, up to 100 daily patient requests. It is also indicated that asking patients to propose several moments when they can receive services helps to minimize the need for care workers through more efficient route allocations without affecting significantly the balance of the workloads.Originality/valueThis article provides a new framework for modeling and solving a HHC routing problem with multiskilled personnel. The proposed model can be used to identify efficient daily plans and can handle realistic characteristics such as time-dependent travel times or be extended to other real-life applications such as maintenance scheduling problems.

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Section: Related Research Workmentioning

confidence: 99%

Section: Related Research Workmentioning

confidence: 99%

A network flow-based model for operations planning in home health care delivery

Castaño

Velasco

2020

IJLM

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“…Diffusion bonding involves complex boundary migration and plastic deformation [8][9][10][11]. While most works currently focused on the superplasticity of steels and ferrous alloys [12][13][14][15], very limited research has investigated the diffusion bonding process [16][17][18]. The microstructure evolutions during the DB would certainly determine the mechanical behaviors of the formed parts [19]; thus, the purpose of this study was to explore the effect of initial materials on the bonding joints microstructures.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Zhang

Jiang

et al. 2022

Metals

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Superplastic forming and diffusion bonding (SPF/DB) has been recognized as a viable manufacturing technology. However, the basic understanding of grain size and its effects on the quality of diffusion bonds is still limited. In this study, a certain type of SP700 alloy with different grain sizes is bonded at superplastic temperature. The experimental results indicate that the same materials, if coarse-grained, may not readily bond under identical conditions of pressure, temperature, and time. This type of bonding is possible because of the presence of many grain boundaries in fine-grained materials that act as short-circuit paths for diffusion. In addition, grain-boundary migration is also faster in fine-grained than in coarse-grained materials. Fractographic studies show that the dimples on the coarse-grained specimen have large dimensions compared with that in the fine-grained material, indicating that heterogeneous deformation develops in the coarse-grained specimen during tension.

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Superplastic forming analysis techniques

García-Barrachina¹,

Gámez²

2021

Advanced Welding and Deforming

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Dimensional analysis of superplastic bulge forming

Cited by 4 publications

References 16 publications

A network flow-based model for operations planning in home health care delivery

A network flow-based model for operations planning in home health care delivery

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Superplastic forming analysis techniques

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