Printed pressure housings for underwater applications

Breddermann, K.; Drescher, Philipp; Polzin, Christian; Seitz, Hermann; Paschen, Mathias

doi:10.1016/j.oceaneng.2015.12.033

Cited by 25 publications

(14 citation statements)

References 18 publications

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“…Although the literature reports numerous complex theoretical treatments, there is a lack of implementation in real and diverse applications [21], and there are few validations of the proposed theories. The cases presented in the state-of-the-art literature do not fit the results obtained herein (Section 5) because of the non-negligible discrepancy in the constraints and the production process (e.g., [7]). A similar problem, which was found to be inherent in the difficult task of associating a coefficient with a type of constraint, was discussed in [27].…”

Section: Introductionmentioning

confidence: 67%

“…In underwater robotics [6], the more commonly used geometry is spherical rather than a flat surface because the distribution of stress on the surface is homogeneous, and the hydrodynamic drag is reduced. The hull material is another fundamental aspect to consider since the production process can introduce non-negligible peculiarities [7,8]. In this case, the use of PolyMethyl MethAcrylate (PMMA) as a material allows for an appropriate balance between inexpensiveness, optical properties, and mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Hull Design Methods for Unmanned Underwater Vehicles

Meschini

Ridolfi

Gelli

et al. 2019

JMSE

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This paper describes design methods for the plastic hull of an Unmanned Underwater Vehicle (UUV), with a particular focus on its cylindrical body and nearly spherical domes at the ends. With the proposed approach, the methodologies reported in the literature were compared, and suitable modifications and improvements were investigated and implemented to extend the classical theories and data to this case study. The investigated underwater vehicle, named FeelHippo, was designed and assembled by the Department of Industrial Engineering of the University of Florence. Its main hull is composed of an extruded PMMA (PolyMethyl MethAcrylate) cylinder and two thermoformed PMMA domes. Breakage of the hull results in destructive phenomena, namely, yielding and buckling. An experimental campaign and FEM (Finite Element Method) analysis were carried out to complete the theoretical study, and the collapse pressures were compared with the derived design values. In conclusion, the proposed innovative method is a lean and effective technique for designing underwater hull domes and predicting the collapse pressures.

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Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Pressure Hull Design Methods for Unmanned Underwater Vehicles

Meschini

Ridolfi

Gelli

et al. 2019

JMSE

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“…The peak corresponding to vitamin E was quantified (m/z 429.373), revealing a linear evolution (R 2 = 0.9948) of the intensity as a function of the amount of vitamin E [36]. Hence, migration assessments of vitamin E from the LDPE could be carried out and compared with an official method prescribed by EU regulations [2]. According to the official EU method, the food simulant (95% ethanol which simulates fatty food) must be analyzed by LC-MS after contact with the plastic sample.…”

Section: Semi-quantitationmentioning

confidence: 99%

“…Polymers are mainly petroleum-based and usually contain additives that ensure their mechanical properties and attractive appearance are retained, but also improve their life-time and lower processing costs [1,2,3,4]. Polymers are omnipresent in everyday life, used in clothing to electronics, and in medical equipment to food packaging.…”

Section: Introductionmentioning

confidence: 99%

Potential of Liquid Extraction Surface Analysis Mass Spectrometry (LESA—MS) for the Characterization of Polymer-Based Materials

Issart

Szpunar

2019

Polymers

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Liquid extraction surface analysis mass spectrometry (LESA -MS) is a direct analysis method suitable for the analysis of polymers. It is based on a fast and efficient extraction of polymer components, such as non-intentionally added species (NIAS), post-polymerization residues, or additives, and residues resulting from specific uses followed by their MS detection. In comparison with batch methods, it is a “green” method, using negligible volumes of organic solvents, and it is cost-effective, avoiding lengthy sample preparation procedures. It can be used for the detection of known molecules (targeted analysis), identification of unknown species (exploratory analysis requiring MS/MS) and semi-quantative analysis, if standards are available. The to-date applications of LESA-MS in the field of polymer science are reviewed and critically discussed taking into account the hands-on experience from the authors’ laboratory. Future possibilities of LESA applications are highlighted.

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“…It not only has the advantage of reducing manufacturing costs but also gives designers greater freedom. Breddermann et al [12] investigated the possibility of building pressure housings in the AM process, and they demonstrated that the housings could be produced even though the reliability still needed to be confirmed.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties

Zhang

et al. 2019

Materials

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Silicon nitride (Si3N4) ceramic materials are increasingly being used in deep-sea pressure-resistant applications because of their high compressive strength-to-weight ratio. In the present study, Si3N4 ceramic floatation spheres with an outer diameter of approximately 101 mm are successfully batch produced and evaluated. The implementation method was to prepare Si3N4 ceramic hemispherical housings and pair them together. In order to improve the safety of the joint, the hemispherical Si3N4 housings were gradually thickened from 1.80 to 2.50 mm at the equator near the joining surface, based on a 3D model with additive manufacturing technology. The weight-to-displacement ratio of the prepared floatation sphere is approximately 0.34 g/cm3. The flexural strength, compressive strength of the material and the collapse strength of a number of Si3N4 floatation spheres were tested to be 1150, 3847, and 205 MPa, respectively, to confirm the reliability of the process. Additional sustained and cyclic hydrostatic pressure tests simulating the full ocean depth working conditions are carried out on several Si3N4 floatation spheres, which perform very well and do not fail.

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Printed pressure housings for underwater applications

Cited by 25 publications

References 18 publications

Pressure Hull Design Methods for Unmanned Underwater Vehicles

Pressure Hull Design Methods for Unmanned Underwater Vehicles

Potential of Liquid Extraction Surface Analysis Mass Spectrometry (LESA—MS) for the Characterization of Polymer-Based Materials

Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties

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