Polysulfide Sealants

1981 ◽  
Vol 54 (2) ◽  
pp. 197-210 ◽  
Author(s):  
N. D. Ghatge ◽  
S. P. Vernekar ◽  
S. V. Lonikar
Keyword(s):  
Building Industry ◽  
Stress And Strain ◽  
Ship Building ◽  
Fuel Tanks ◽  
Liquid Polymers ◽  
Pot Life ◽  
Weather Resistance ◽  
Polymer Fillers ◽  
Thickening Agents ◽  
Polysulfide Polymer

Abstract Sealants based on polysulfide liquid polymers are widely used in a number of applications. These sealants are solvent and chemical resistant, having good flexibility and adherence to many substrates such as steel, aluminum, glass, concrete, wood, etc. These are used to line fuel tanks of aircraft and to seal fuel tanks and rivetted joints in aircraft. These sealants, being water resistant, are widely used in ship building to seal decks and planking. Since these sealants have good weather resistance and can withstand stress and strain, they are widely used in the building industry. They are found to be very satisfactory in modern curtain walls and in sealing windshields of motorcars. Their use in airfield and runway constructions is well known. These sealants generally have a two-pot system consisting of (i) a base caulk containing a liquid polysulfide polymer, fillers, plasticizers, adhesive promotors, thickening agents, accelerators or retarders and (ii) a curing agent. Sometimes accelerators and retarders are used as a third pot system to regulate the pot life of caulking compounds.

scholarly journals COMPARATIVE STUDY OF STRESSES AND STRAINS THAT OCCUR IN STRUCTURAL ELEMENTS MADE OF COMPOSITE MATERIALS CONSIDERING THE MODEL WITH AND WITHOUT LAYERS

2016 ◽  
Vol 18 (4) ◽  
Author(s):  
FLORENTINA TOCU ◽  
COSTEL IULIAN MOCANU
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Mechanical Characteristics ◽  
Building Industry ◽  
Careful Study ◽  
Structural Elements ◽  
Ship Building ◽  
Isotropic Plates ◽  
Layer Composite ◽  
Collective Experience

<p>Fibreglass-reinforced polyester (GRP) is the most widely used composite material in the ship building industry and requires careful study in point of mechanical characteristics. This article presents the collective experience related to behaviour in different situations of GRP loading. We considered three cases manufacturing for GRP: layers with mechanical characteristics for each layer, composite (the material is considered isotropic but with layers and same mechanical properties for all layers), and isotropic plates.</p>

Educating Maritime Engineers for a Globalised Industry: Bridging the Gap Between Industry and Universities

2012 ◽  
Author(s):  
Ingrid M. V. Andersen ◽  
Ulrik D. Nielsen
Keyword(s):  
Engineering Students ◽  
Building Industry ◽  
Maritime Industry ◽  
Large Share ◽  
Ship Building ◽  
The Past ◽  
The Future ◽  
Technical University ◽  
Made In

In Denmark, the maritime engineering competences requested by the industry have changed in the past one to two decades. The typical naval architects do no longer find them selves working in the ship-building industry but rather in the industry of ship operators, consultancies, class societies, etc. This means that universities educating maritime engineers need to reflect the changes in the curricula for their maritime engineering students. Topics and issues regarding this matter have recently been addressed in a survey made in the Danish maritime industry. The survey concludes that the demand for maritime engineers in the industry is considerably larger than the output from the technical universities. Moreover, it sets forth a series of recommendations to the industry as well as to the universities to facilitate meeting the demand for maritime engineers in Denmark in the future. The recommendations are outlined together with work commenced at the Technical University of Denmark (DTU) to update the curricula for DTU’s maritime engineering students. Thus, DTU offers an education reflecting a large share of the recommendations in the curricula.

The 1983 CAD/CAM Survey: Why It’s Still Relevant, What It Said

1987 ◽  
Vol 3 (02) ◽  
pp. 87-94
Author(s):  
Richard L. Diesslin
Keyword(s):  
Cross Section ◽  
Building Industry ◽  
User Experiences ◽  
Shipbuilding Industry ◽  
Ship Building ◽  
Computer Technologies ◽  
Cad Cam ◽  
Industry Survey ◽  
The U.S

The response to the CAD/CAM shipbuilding industry survey of 1983 was quite comprehensive. The survey included an invaluable cross section of shipyards and design agencies of all sizes, levels of sophistication, and type of production. It remains the most significant study of its kind in recent years. Eighteen shipyards and four design agencies participated. In addition, nine visits were made, eight to shipyards and one to a design agency. This paper summarizes the findings of the CAD/CAM survey, which studied the application of computer technologies (CT's) to manufacturing in the U.S. ship building industry. Six major CT areas are evaluated across 79 specific shipyard functions; then the software in use is evaluated based on user experiences. Finally, computer technologies are evaluated based on their qualitative benefits and problems. Highlights from the shipyard visits are outlined, voids in the shipbuilding industry's application of CT are presented, and recommendations and conclusions are cited based on survey findings.

Nesting of Complex 2-D Parts Within Irregular Boundaries

1996 ◽  
Vol 118 (4) ◽  
pp. 615-622 ◽  
Author(s):  
H. J. Lamousin ◽  
W. N. Waggenspack ◽  
G. T. Dobson
Keyword(s):  
Convex Hull ◽  
Computational Efficiency ◽  
Offshore Platform ◽  
Building Industry ◽  
Complex Profile ◽  
Ship Building ◽  
Shaped Part ◽  
Irregular Boundaries ◽  
Complex Parts ◽  
Placement Procedure

An algorithm is outlined for the nesting of complex parts onto resources with irregular boundaries. The algorithm adapts Albano and Sapuppo’s technique for nesting irregular profiles on rectangular resources using a novel placement procedure. Several techniques for improving computational efficiency are also described, including complex profile simplification using a modified convex hull strategy. The enhanced algorithm is applied to the nesting of irregular parts on both rectangular resources and within irregular shaped part voids as applied to the offshore platform and ship building industry.

scholarly journals An Efficient Heuristic Approach for Irregular Cutting Stock Problem in Ship Building Industry

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Yan-xin Xu
Keyword(s):  
Complete Solution ◽  
Packing Problem ◽  
Industrial Applications ◽  
Cutting Stock Problem ◽  
Cutting Stock ◽  
Building Industry ◽  
Real Problem ◽  
Ship Building ◽  
Irregular Shapes ◽  
Better Than

This paper presents an efficient approach for solving a real two-dimensional irregular cutting stock problem in ship building industry. Cutting stock problem is a common cutting and packing problem that arises in a variety of industrial applications. A modification of selection heuristic Exact Fit is applied in our research. In the case referring to irregular shapes, a placement heuristics is more important to construct a complete solution. A placement heuristic relating to bottom-left-fill is presented. We evaluate the proposed approach using generated instance only with convex shapes in literatures and some instances with nonconvex shapes based on real problem from ship building industry. The results demonstrate that the effectiveness and efficiency of the proposed approach are significantly better than some conventional heuristics.

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