Re: [MW:5388] CTOD

Hi, If your project spec calls for it do it. DNV OS F108 talks about pipeline CTOD Nandeesha     --- On Fri, 4/6/10, ali asghari <asgharialigl@gmail.com> wrote: From: ali asghari <asgharialigl@gmail.com> Subject: Re: [MW:5385] CTOD To: materials-welding@googlegroups.com Date: Friday, 4 June, 2010, 4:19 AM Dear Mr.Mahendra Reddy Thank you for useful informations. but when it is prefered rather than charpy impact test? in which documents say the acceptance criteria & how the results shall be omterpretated? regards On Thu, Jun 3, 2010 at 7:54 PM, mahendra reddy <mahendra.mog@gmail.com> wrote: Crack Tip Opening Displacement test or CTOD is one of a family of fracture mechanics tests that measures the resistance of a material to growing a crack. Similar tests (i.e., da/DN, K1C, KEE, and J1C) can determine fracture resistance of a material, but CTODis particularly suited to pipeline and drilling equipment. The CTOD test is used to determine the fracture mechanics properties of ductile materials and can be thought of as the simulated opening of a pre-existing fatigue crack prior to fracture. The data that result from this opening can be used for critical defect assessment, in which the critical defect size can be determined. The CTOD Test Process Please note that the following is a simplified version of the CTOD test process and does not cover all aspects of the test, such as personalized testing specifications. A CTOD test can be broken into 4 main steps: 1.      Machining of the test specimen (Sample Machining); 2.      Fatiguing of the specimen within specified limits (Pre-Cracking); 3.      Breaking of the specimen under controlled conditions (Fracture); 4.      Post analysis of the specimen and resultant data to obtain the CTOD value (Data Analysis). rgds m.m.reddy On Thu, Jun 3, 2010 at 6:07 PM, Eng/ Mostafa Kamel Hussein <mkh_200@yahoo.com> wrote: DEAR ALL,   WHAT IS MEANT BY CTOD? AND HOW CAN I USE IT?   REGARDS,   SaSa -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- M.M.REDDY QA/QC INSPECTOR (MECHANICAL) METHANOL PLANT DAMIATTA - EGYPT 0020168194532 -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.