Mr. Soliman,
The easiest test to determine the correct strength properties (and grade) of the bolts is to perform hardness testing on the cross section of the failed bolts. The average hardness on the cross section can be converted to an approximate value of ultimate tensile strength (UTS). If your budget allows, you may also perform a chemical analysis and microstructural analysis, which will tell you if your material is correct and in the proper microstructural condition. Additionaly, you can have the fracture surfaces of the bolts examined with an SEM that can search for failure mechanisms like hydrogen embrittlement but this is getting more expensive.
Regards,
Jeremy Zibin, PEng
From: Chandra Bhusan Tripathi <cbt@rediffmail.com>
To: Mohamed.Soliman@WorleyParsons.com
Cc: materials-welding@googlegroups.com
Sent: Tue, March 30, 2010 1:40:52 AM
Subject: Re: [MW:4632] Bolts failure
You can send damaged bolt for tensile testings. Sometime the bolts also fails due to over tightening. Please check with the manufacturer for correct tightening torque.
On Tue, 30 Mar 2010 11:38:16 +0530 wrote
>
Dear all ,
Ihavea casefor the bolts and nutGrade 8.8 ,Carbon steel material according to EN 20 898.Those bolts and nuts are failedduring the tightening and some of the nuts are loose .
What tests can becarried out to ensure the soundness of those bolts .
Best Regards
M.S
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