Design and test of continuous fabrication process for high-strength nanocellulose based long-fiber

2020 ◽  
Author(s):  
Hyun Chan Kim ◽  
Pooja S. Panicker ◽  
Lindong Zhai ◽  
Qin Yu Zhu ◽  
Jaehwan Kim
Keyword(s):  
High Strength ◽  
Fabrication Process ◽  
Continuous Fabrication

Analysis of Causes for Cracking of Chinese Large High-Strength Steel Spheric Tank and Suggestion About Its Prevention

2007 ◽  
Author(s):  
Xuedong Chen ◽  
Rong Yuan ◽  
Bing Wang ◽  
Tiecheng Yang ◽  
Pingjin Li ◽  
...  
Keyword(s):  
Failure Analysis ◽  
High Strength Steel ◽  
Field Survey ◽  
High Strength ◽  
Fabrication Process

In recent ten years, a number of cracking cases were reported on the in-service high-strength steel spheric tank made of 07MnCrMoVR and 07MnNiCrMoVDR steels (CF-62 steel for short) which were developed in China independently. Based on field survey, actual vessel inspection and failure analysis, it is pointed out that the quality of the steels, the problems existing in design and fabrication process and incompleteness of relevant standards are the major cause of cracking. Recommendations for cracking prevention of the high-strength steel spheric tank made of Chinese CF-62 steel are proposed.

Fabrication Process for a High Strength 9Cr-2W Steel Sheet

2010 ◽  
Vol 638-642 ◽  
pp. 2263-2267
Author(s):  
Tae Kyu Kim ◽  
Chang Hee Han ◽  
Sung Ho Kim ◽  
Chan Bock Lee
Keyword(s):  
Heat Treatment ◽  
Cold Rolling ◽  
Process Parameters ◽  
Carbon Concentration ◽  
Room Temperature ◽  
Steel Sheet ◽  
High Strength ◽  
Tensile Tests ◽  
Fabrication Process ◽  
Martensitic Steels

This study deals with the fabrication of high strength ferritic/martensitic steels by a control of both the carbon concentration and the fabrication process parameters. The 9Cr-2W steels containing a carbon concentration of 0.05, 0.07 and 0.11 wt% were normalized at 1050oC for 1 h, followed by a tempering at 550 and 750oC for 2 h, respectively. The results of the tensile tests at room temperature indicated that the tensile strengths were increased with an increase of the carbon concentration from 0.05 wt% to 0.07 wt%, but no more increase was observed when the carbon concentration was increased further up to 0.11%. After a cold rolling from a 4 mm to a 1 mm thickness without/with an intermediate heat treatment and a final heat treatment, the results of the tensile tests exhibited that superior tensile properties were obtained when the fabrication processes were composed of a tempering at 550oC, and a cold rolling with several intermediate heat treatments. These results could be attributed to the finely distributed precipitates in the partially recrystallized matrix. The optimized carbon concentration and the controlled fabrication process parameters are thus suggested to fabricate a high strength 9Cr-2W steel sheet.

scholarly journals Custom TMJ Hemi-joint Fabrication Process

2008 ◽  
Vol 2 (2) ◽  
Author(s):  
Joel L. Kuhlmann ◽  
Sean McEligot
Keyword(s):  
Temporomandibular Joint ◽  
Mayo Clinic ◽  
Fused Deposition Modeling ◽  
High Strength ◽  
Fabrication Process ◽  
Implant Design ◽  
3D Cad ◽  
Fused Deposition ◽  
Joint Disorder ◽  
Unique Shape

Temporomandibular joint disorder afflicts 10 million Americans, many of whom have osteoarthritis of the temporomandibular joint (TMJ). This condition can inflict severe pain and disrupt the lives of sufferers in many ways. Partial or total replacement of the temporomandibular joint is a last resort treatment option. Surgeons at Mayo Clinic believe a new hemijoint implant design coupled with unique surgical technique can improve joint kinematics and reduce pain. They are currently investigating a patent-pending implant design in a series of patient trials. The Division of Engineering at Mayo Clinic has developed a novel process for fabricating TMJ implants for this study. Computed Tomagraphy (CT) images of the surgical site are first converted into a 3D computer model of the mandibular fossa and condyle area. A fused deposition modeling process is used to create a plastic model of the anatomy, and the surgeons use that model to create a wax mold of the implant. The wax mold is laser scanned to create a 3D CAD model that can be machined with a standard four axis milling machine out of implant grade CoCrMo material. Because of the unique shape of the implant, the machining takes place in two phases, with the implant being refixtured between machining phases using a high strength industrial adhesive. Finally, the implant is polished, inspected, passivated and sterilized for surgery. This fabrication process has allowed Mayo Clinic surgeons to quickly and accurately test their unique implant design.

Inspection and Testing of Serially Produced Pressure Vessels

2005 ◽  
Author(s):  
Ian Roberts ◽  
Guy Baylac ◽  
Erik Zeelenberg
Keyword(s):  
Pressure Vessels ◽  
Fabrication Process ◽  
Continuous Fabrication

The vast majority of applications of EN 13445-5:2002 will be for individually designed pressure vessels, but there will be a significant sector of serially produced pressure vessels, built in a continuous fabrication process to a single design. This paper presents Annex A of EN 13445-5 which addresses inspection and testing of these pressure vessels and gives the thinking and rationale behind these requirements.

Continuous fabrication process for double sided micro/nanopatterns

2014 ◽  
Vol 18 (sup5) ◽  
pp. S5-21-S5-24
Author(s):  
M. K. Kwak ◽  
C. W. Park
Keyword(s):  
Fabrication Process ◽  
Continuous Fabrication

scholarly journals Ultra-Porous Nanocellulose Foams: A Facile and Scalable Fabrication Approach

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1142 ◽  
Author(s):  
Carlo Antonini ◽  
Tingting Wu ◽  
Tanja Zimmermann ◽  
Abderrahmane Kherbeche ◽  
Marie-Jean Thoraval ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Weight Ratio ◽  
High Strength ◽  
Mechanical Tests ◽  
Immiscible Liquid ◽  
Absorption Capacity ◽  
Fabrication Process ◽  
High Porosity ◽  
Oil Absorption ◽  
Environmental Pressures

Cellulose nanofibril foams are cellulose-based porous materials with outstanding mechanical properties, resulting from the high strength-to-weight ratio of nanofibrils. Here we report the development of an optimized fabrication process for highly porous cellulose foams, based on a well-controlled freeze-thawing-drying (FTD) process at ambient pressure. This process enables the fabrication of foams with ultra-high porosity, up to 99.4%, density of 10 mg/cm3, and liquid (such as oil) absorption capacity of 100 L/kg. The proposed approach is based on the ice-templating of nanocellulose suspension in water, followed by thawing in ethanol and drying at environmental pressures. As such, the proposed fabrication route overcomes one of the major bottle-necks of the classical freeze-drying approach, by eliminating the energy-demanding vacuum drying step required to avoid wet foam collapse upon drying. As a result, the process is simple, environmentally friendly, and easily scalable. Details of the foam development fabrication process and functionalization are thoroughly discussed, highlighting the main parameters affecting the process, e.g., the concentration of nanocellulose and additives used to control the ice nucleation. The foams are also characterized by mechanical tests and oil absorption measurements, which are used to assess the foam absorption capability as well as the foam porosity. Compound water-in-oil drop impact experiments are used to demonstrate the potential of immiscible liquid separation using cellulose foams.

Fabrication technique using a core and cavity mold of a hybrid composite ballistic helmet

2021 ◽  
Vol 21 (3) ◽  
pp. 623-629
Author(s):  
M.S.A.M. Alim ◽  
F. Mustapha ◽  
M.N. Abdullah ◽  
M.T.H. Sultan ◽  
M.K.H. Muda
Keyword(s):  
Room Temperature ◽  
Impact Resistance ◽  
Weight Ratio ◽  
High Strength ◽  
Fabrication Process ◽  
Mold Design ◽  
Molding Process ◽  
Thermoset Resin ◽  
Shaping Process ◽  
Curing Methods

Material used for helmet technology has transformed moderately little since the introduction of aramids, which ballistic helmets still uses woven aramids with a thermoset resin system. Most widely used strengthening material for ballistic helmet is Kevlar fibers which comprise outstanding impact resistance and high strength to weight ratio. For Kevlar reinforcement and resin shaping process, composite materials uses molding process in the fabrication methods. The most vital fabrication method is the hand lay-up process. Hand lay-up process normally consists of laying a dry fabric layer by hand onto a mold to shape into desirable design and shape. After the lay-up process is done, resin is then applied to the dry plies. There are several accessible curing methods and the most commonly used method is to let the product to cure at room temperature. This paper presents the fabrication process of ballistic helmet using a hand lay-up fabrication process with a core and cavity mold. This paper also describes the helmet mold design, materials and processing methods.

scholarly journals Continuous Fabrication of Wide-Tip Microstructures for Bio-Inspired Dry Adhesives via Tip Inking Process

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Sung Ho Lee ◽  
Cheol Woo Park ◽  
Moon Kyu Kwak
Keyword(s):  
Continuous Process ◽  
Reversed Phase ◽  
Fabrication Process ◽  
New Method ◽  
Dry Adhesive ◽  
Microstructure Fabrication ◽  
High Durability ◽  
Dry Adhesives ◽  
Process System ◽  
Continuous Fabrication

In this paper, we report a new method for continuous fabrication of dry adhesives composed of microstructures with mushroom-shaped ends. Conventional mushroom microstructure fabrication is performed with a simple molding technique using a reversed phase master. In a typical fabrication process, thin- and wide-tip portions may be ripped during demolding, making it difficult to use in a continuous process. It is also difficult to apply the mushroom structure master to a continuous process system in roll form. Here, a continuous fabrication process was developed by applying the method of fabricating a wide tip using a tip inking method after forming a micropillar. Through the continuous process, the dry adhesive was successfully fabricated and the durability was measured with a reasonable pull-off strength (13 N/cm2). In addition to the reasonable adhesion, high durability is guaranteed, and fabricated dry adhesives are expected to be used in various fields.

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