Nanotechnologies. Materials specifications. Guidance on specifying nano-objects

2015 ◽  
Keyword(s):  
Materials Specifications

Some Aspects of Modern Aircraft Materials

1955 ◽  
Vol 59 (535) ◽  
pp. 494-501 ◽  
Author(s):  
H. Sutton
Keyword(s):  
Alloying Elements ◽  
List Type ◽  
Type Number ◽  
Current Standard ◽  
British Standard ◽  
Points Of View ◽  
Testing Schedule ◽  
Wartime Experience ◽  
Materials Specifications

Wartime experience with aircraft steels emphasised the desirability of a complete revision of specifications for aircraft steels from both the technical and inspectional points of view. This was undertaken in association with the steel makers and the Society of British Aircraft Constructors under the aegis of the British Standards Institution. The aims were(i)To reduce the number of basic types of steels to a minimum, consistent with satisfying the demands of aircraft engineers.(ii)To transfer as many materials from the D.T.D. series of specifications to the B.S. Aircraft series.(iii)To prepare an Inspection and Testing Schedule, which would exist separately from the Materials Specifications, but applicable to all steels in whatever form they may be required.(iv)To achieve a degree of economy in alloying elements, again without detriment to the satisfying of designer's requirements.The Inspection and testing schedule was issued as British Standard S100 in January 1949, but significant difficulties in its full application appeared in practice and it was not until the second half of 1952 that agreement was reached to put into practice the current standard 2 S100.

From Thesis to Teaching: The Practice of Using Rocks in Architecture and the Challenge of "Making it Different"

2020 ◽  
Vol 848 ◽  
pp. 157-164
Author(s):  
Risale Neves
Keyword(s):  
Access To Information ◽  
Natural Materials ◽  
Technological Data ◽  
The Subject ◽  
The Creation ◽  
Materials Specifications ◽  
Lack Of Knowledge

About 20 years ago, the lack of knowledge of the Brazilian architects about the use of rocks as natural materials was being commented which may have contributed to the problems of the stone coatings of buildings in several cities, compromising their original features and the beauty of many works. Professionals did not seek technological data on rocks and students were not instructed on such subjects in classrooms. The choice of these materials was supposedly empirical. Between 2010 and 2012 it was possible to obtain access to information about the contents of materials teaching in the architecture courses of Brazil, and also to inquire whether or not there was knowledge by architects active in the market on the subject, interviewing 64 professionals in 13 states from the country. The architects would be authors of architectural projects of large buildings and responsible for the materials specifications. Conclusion: there is no teaching directed to the use of rocks in Architecture in the country courses and architects never learned formally about such subject, fact that justified in a doctorate thesis proposal, the creation of the first discipline on the subject in the Course of Architecture and Urbanism of the Federal University of Pernambuco, UFPE, Brazil.

Quality Control and Service Performance

1964 ◽  
Vol 86 (4) ◽  
pp. 451-464
Author(s):  
H. Thielsch
Keyword(s):  
Heat Treatment ◽  
Quality Control ◽  
Service Performance ◽  
Current Standard ◽  
Considerable Confusion ◽  
Final Inspection ◽  
Writing Practice ◽  
Materials Specifications

Quality control requirements are discussed as they pertain to (a) materials specifications; (b) fabrication specifications including welding, heat-treatment, and cleaning; and (c) final inspection specifications. Current standard and specification writing practice is resulting in considerable confusion among the users of these specifications. Realistic levels of quality control commensurate with service requirements need to be established. Lack of recognition of service requirements has resulted in excessively tight quality control requirements. Excessive repairs have led to more serious defect conditions not detectable by the normal inspection requirements involved.

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