This video isn't the most scientific and mixing proper amounts properly factors in, there is one clear winner

 

 

Edited December 5, 20178 yr by Ron Dudelston
tags added

I did some research last year on "strength of joints."  That also translates into strengths of adhesives.   One flaw with all these tests is they only test one type of stress, of which there are five:

1. Compression (pushing together)
2. Tension (pulling apart)
3. Shear (force at 90 degrees to the joint) -- This is one of the ASTM tests for glue.
4. Racking (force applied in rotation to the joint) (The test shown), also the one Matthias Wandel uses for most of his tests)
5. Cleavage (force applied by a wedge)

Glues have different properties.   For example CA glue is very strong in tension (remember the ads where the guy puts it on his helmet and raises himself up with a cable?) but very weak in shear (so you can use it as a make-shift thread lock (which will shear when you put on a wrench or screwdriver).

One of the reasons I haven't tried the DAP glue sample for turning- may be too much shear force.

Because the bolt head had some dimension (3/4" ?), wouldn't you get tension at the top of the bolt head, compression at the bottom, and shear across the head/block interface?  The test seems to be a mixed-mode method, but I'd accept the rank order of successes for what we do.  The failures seemed to be in the glue, because the test blank surfaces didn't seem scored as the camera panned by.  (But then I guess metal glue doesn't work by penetration.)

Edited July 22, 20179 yr by PeteM

i want the shop.  you can have the glue. 

Edited July 23, 20179 yr by p_toad

On 7/22/2017 at 9:56 AM, PeteM said:

Because the bolt head had some dimension (3/4" ?), wouldn't you get tension at the top of the bolt head, compression at the bottom, and shear across the head/block interface?  The test seems to be a mixed-mode method, ...

Racking