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
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.
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