Aluminium mating resistance

[julio]

Could someone give me datas on mating resistance of aluminium under pressure of a tightened screw
The material is die-cast aluminium ref :
Al-Si8 Cu3Fe according ISO3522
A380.0 / SC84A according to ASTM B85

 

[CoryPad]

If your term "mating resistance" is the same as allowable surface pressure, then you can use the relationship:

p_G &[ignore]asymp[/ignore]; R_M

where

p_G = allowable surface pressure
R_M = ultimate tensile strength

This relationship was derived by U. Arz et al. in Konstruktion 7-8 (2002), 38-42".

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[hrehman7]

Another good source should be VDI2230 Feb'03, pg 119 which provided allowable surface pressure limits for some materials inclduing GK-AlSi9Cu3 (220MPa), GD-AlSi9Cu3 (290MPa). GK is gravity die casting and GD is pressure die casting.

 

[kenvlach]

See pages 42-43 in Aluminium: Physical Properties, Characteristics and Alloys from the European Aluminium Association:

http://www.eaa.net/education/TALAT/lectures/1501.pdf

"Bearing
The ultimate bearing or crushing strength of aluminium is as difficult to define, test, or relate to tensile properties as it is with other metals. Bearing must, however, often be a criterion in the design of riveted or bolted structures, and a bearing yield stress is widely recognized; this is arbitrarily defined as the pressure (per unit effective bearing area) exerted by a pin at a round hole that will permanently deform the hole by 2% of its original diameter (Figure 1501.05.06). This stress, for most alloys, approximates in value to the ultimate tensile stress. The ultimate bearing strength of most aluminium alloys is about 1.8 times the U.T.S."

The figure on p. 43 shows Compression, Shear, Bearing Strength and Brinell Hardness for Aluminium Alloys 1200, 3103, 5251, 5083, 6062, 7004, 2014 and 7075 (increasing strength order).