Fatigue strength of vascomax 350
Fatigue strength of vascomax 350
(OP)
Hi,
I need to calculate the fatigue strength of vascomax 350 material.
I have referred Machine design Hand book, Author-Shigley
The data provided and example calculation is for material having Ultimate strength less than 200ksi.
The Ultimate strength of vascomax 350 is 350ksi .
Please help me calculating the fatigue strength for the material.
Mainly I require the true stress at fracture (σ'F) for the material.
Thanks,
Ana
I need to calculate the fatigue strength of vascomax 350 material.
I have referred Machine design Hand book, Author-Shigley
The data provided and example calculation is for material having Ultimate strength less than 200ksi.
The Ultimate strength of vascomax 350 is 350ksi .
Please help me calculating the fatigue strength for the material.
Mainly I require the true stress at fracture (σ'F) for the material.
Thanks,
Ana





RE: Fatigue strength of vascomax 350
You can perform a literature search using the free sites Google Scholar and Scirus.
MIL-HDBK-5 has data for maraging steels in the 250 and 280 (300) conditions.
You could pay to have actual testing performed.
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Fatigue strength of vascomax 350
a simple yahoo for "vascomax" found allvac.com, with a very nice data sheet for these steels, including your 350 alloy, and including a generic fatigue curve.
geez, i wish people would do alittle digging before asking for info that is readily available !
RE: Fatigue strength of vascomax 350
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Fatigue strength of vascomax 350
i'd use the available data (cautiously) ... it's enough to make you think about fatigue stresses >120ksi.
RE: Fatigue strength of vascomax 350
visited the Allvac.com and found the fatigue strength.
they have tested using the "R R Moore Rotating Beam Fatigue test".(image attached)
But when we refer Mil-HDBk-5, they simply refer S-N curve.
But in here they have mentioned "R R Moore Rotating Beam Fatigue test".
I am confused.
Please explain
RE: Fatigue strength of vascomax 350
RE: Fatigue strength of vascomax 350
As you have mentioned that S-N curve provided in the catalogue is based on the "R R Moore Rotating Beam Fatigue test".
Could you please explain about the curves obtained in Mil-Hdbk-5 i.e how have they plotted this curve?
Thanks,
Paramathma
RE: Fatigue strength of vascomax 350
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Fatigue strength of vascomax 350
i was browsing and found this site about the material. I'll make sure I do my homework before asking a question here. I would say the state the same things as were said when to much info is asked for.
RE: Fatigue strength of vascomax 350
i assume you're building a landing gear, possibly an engine truss. the problem with ultra high strength steel is that whilst fatigue May be acceptable, damage tolerance Sucks. landing gear is about the only place you could reasonably expect to utilise this type of steel, due to damage tolerance requirements. possibly you could essentially make the part disposable (long threshold, very short repeat = replace the part after the threshold life) ... operators may not be particularly happy with that approach.
knowing noting more about your problem, you've got enough data to design the part and have some confidence that when you come to fatigue test it it might not blow-up in your face.
RE: Fatigue strength of vascomax 350
This site is courtesy of meteng.
http:/