Subject	Bending vs tensile test.
Posted by	Schmeal (NV) on August 07, 2017 at 6:00 PM
	This message has been viewed 403 times.
In Reply To	Anyone have a RameyZ idler stud? Long or short... posted by LitlElvis on August 07, 2017 at 11:40 AM
Message	I didn't think the material properties provided the benefit of the Ramey Z stud, it was the fact it had a shoulder to limit the bending deflection. A tensile test is just going to compare different materials with the same cross-section. Wouldn't a bending test be more appropriate? I've never seen one break so I don't know what the primary failure mode is. Since the belt tension pushes up on the pulley I assume it would be a bending/shear problem, not a tensile load problem. If that were the case the aluminum threads would fail before the stud failed in axial direction. ------------------------------------------------- Work on your own car, and don't half ass it.
Follow Ups	Anyone have a RameyZ idler stud? Long or short... - LitlElvis 11:40:04 08/07/17 Bending vs tensile test. - Schmeal (NV) 18:00:31 08/07/17 I personally think most idler stud failures have been - LitlElvis 20:33:33 08/07/17 Has anyone had the Ramey Z stud fail? - ZXRider 21:33:52 08/07/17 Yes, I think you are correct (n/m) - LitlElvis 21:57:42 08/07/17 I recall seeing one failure posted (n/m) - black300zx 11:31:30 08/08/17 whats the rate of thermal expansion for the stud vs idler - gt300zxtt(SoMD) 09:16:43 08/09/17 They are all steel so... - Schmeal (NV) 13:41:54 08/09/17 Re: I personally think most idler stud failures have been - Schmeal (NV) 13:38:23 08/09/17 Where are you getting the YTS of 130ksi? - ZXRider 16:29:31 08/09/17 I'm assuming a "9T" is equivalent to a SAE grade 8 - Schmeal (NV) 17:00:03 08/09/17 Got it. Quick search online puts the "9T" at around 150ksi - ZXRider 17:12:27 08/09/17 i've got a set i didn't use. i decided to use new oem - slayer fan 18:13:18 08/07/17 My concern always what appeared to be tool - black300zx 18:45:23 08/07/17 I have a pair of what I think are early production. - Adam675 22:07:26 08/07/17 http://www.importpartspro.com/raz30upidst.html (n/m) - cjack3 22:46:47 08/07/17 Re: http://www.importpartspro.com/raz30upidst.html - cjack3 22:48:24 08/07/17 Are they permanently discontinued? (n/m) - BoneZ (MD) 02:50:11 08/08/17 Might want to verify that they are not knock-offs - Doug71zt(CAN) 00:00:23 08/09/17 Any clue which vendor that might have been? (n/m) - ZXoltan 13:12:13 08/09/17 In recent fallout of Ramey studs, Z1 has made their own!!! - Joel@Z1 15:18:13 08/09/17 Fallout? Please define fallout. (n/m) - ZXRider 16:52:10 08/09/17 Re: In recent fallout of Ramey studs, Z1 has made their own!!! - Bad Fish 17:12:33 08/09/17 I remember this and had the same thoughts - ZXoltan 20:15:00 08/09/17 Maybe Z1 will donate a set for Brett to test (n/m) - ZXoltan 20:17:38 08/09/17
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