Compressive Shear Strength vs Tensile Lap Shear Strength
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Mechanical Engineering Forum
Posted by: pschranz ®

08/19/2010, 19:21:16

Hello,

I have an application that requires adhesive bonding of two hard coat anodized A356-T6 aluminum tubular parts, one inserted in the other, with a maximum diametrical clearance of 0.0045". The assembly is exerted to torsional forces which it must resist.

My first attempt was using Loctite 601, however this did not hold well at all and the parts slipped with respect to each other within 5 minutes of use. I don't know exactly what the load is, but it is a bicycle seat post application, therefore the load being on the order of the weight of a person.

I was next recommended to use Eccobond-104. Looking at the respective data sheets, they have comparable shear strengths, however the Loctite measures compressive shear strength and the Emerson-Cumming product measures tensile lap shear strength.

Thanks,
Paul








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: Compressive Shear Strength vs Tensile Lap Shear Strength
: Compressive Shear Strength vs Tensile Lap Shear Strength -- pschranz
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Mechanical Engineering Forum
Posted by: Kelly Bramble ®

08/20/2010, 08:14:47

With a nominal clearance of .0045 diameter and .0025 radius, you're going to need somthing less viscous than Loctite 610 or ecobond 104.

These products are not meant to secure components with large gaps amd significant loading. The Loctite is typically used on threaded features and the Ecobond epoxy is a generally used on semiconductor componenets and substrates.

Seems to me that a knurled surface with a thicker epoxy to bond or design a mechanism that can grip and secure the tubular components together like a bicycle seat.








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