domingo, 15 de outubro de 2017

Specimen Shape

This week, the team started to work on the specimen shape that will be used in tension tests and metallography. The specimens will be made of molten aluminum, wich will be put in the foundry mold.

To model the specimen shape, the team searched for some reference dimensions and decided to use those in the ASTM E8 / E8M – 16a - Standard Test Methods for Tension Testing of Metallic Materials.

Besides, those dimensions must include how much the molten aluminum will contract during its crystallising. So, each dimension were calculated according to the contract relation 0,13mm/cm, used for aluminum parts of up to 120cm.
The new dimensions are:

Figure 1 - Specimen dimensions
Source: Own.


Also, one of the members went to the junkyard and got an alluminium alloy that comes from bus floor finishes. This will be one of the alluminum alloys used to manufacture the specimen.


Figure 2 - One of the members at the junkyard 


Source: Own.




Figure 3 - Some aluminum samples

Source: Own


Bibliography:


AMERICAN SOCIETY FOR TESTING AND MATERIALS. ASTM E8 / E8M – 16a: Standard Test Methods for Tension Testing of Metallic Materials. West Conshohocken, PA, 2016


CHIAVERINI, V. Tecnologia Mecânica. Processos de Fabricação e Tratamentos. Volume II. Editora Makron Books. 1986.


Posted by: Luana Andril.

Nenhum comentário:

Postar um comentário