View previous topic :: View next topic 
Author 
Message 
sushant_goel Progressive Member
Joined: 15 Sep 2010 Posts: 42

Posted: Thu Oct 11, 2018 9:40 am Post subject: Query about Tata Structura steel mechanical properties 


Hello,
Please refer to the attached extract from Tata Structura steel brochure which states the mechanical properties of YST310. I have the following queries and would be glad if someone could share their knowledge with me.
1. Minimum yield stress (310MPa) and minimum UTS (450MPa) is clear. Why is the allowable axial stress in tension (186MPa), allowable bending stress in T or C (205 MPa), allowable shear stress (140MPa) and bearing stress (232MPa) less than the minimum yield stress value?
2. What is the difference between yield stress and equivalent stress?
3. Equivalent stress is given as 279 MPa. Is it correct to use the values given in point no. 1 in the formula "[(Axial stress)^2+3(Shear stress)^2]^0.5" to derive this value of 279 MPa?
Description: 

Filesize: 
70.17 KB 
Viewed: 
107 Time(s) 

_________________ Sushant Goel
MSc Uni Stuttgart 

Back to top 


sakumar79 ...
Joined: 18 Apr 2008 Posts: 681

Posted: Thu Oct 11, 2018 2:47 pm Post subject: 


Dear Er Sushant Goel,
With reference to your first query, please note that the allowable stress is probably worked out as per old IS 800 in working stress method (for tension, allowable stress is 0.6 fy, etc)
Yours sincerely
Arunkumar


Back to top 


sushant_goel Progressive Member
Joined: 15 Sep 2010 Posts: 42

Posted: Fri Oct 12, 2018 8:09 am Post subject: 


Dear Arun Kumar,
Thanks for rightly pointing out that working stress method has been used to calculate the allowable axial stress in tension (0.60*310=186MPa). I was trying to figure it out using the limit state method.
Regards,
Sushant


Back to top 


u.mukesh General Sponsor
Joined: 26 Jan 2003 Posts: 98 Location: Delhi

Posted: Wed Dec 05, 2018 12:30 pm Post subject: Query about Tata Structura steel mechanical propertie 


Hello Shushant
The permissible stresses are not equal to Yield stresses in any case.For instance axial tensile stress in Working Stress method is 0.6*fy (310x0.6 =186 MPa).
Even in limit state we restrict permissible stresses upto 0.87 fy.
Regards
Mukesh Upadhyay
On Thu, Oct 11, 2018 at 5:12 PM sushant_goel <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:  Hello,
Please refer to the attached extract from Tata Structura steel brochure which states the mechanical properties of YST310. I have the following queries and would be glad if someone could share their knowledge with me.
1. Minimum yield stress (310MPa) and minimum UTS (450MPa) is clear. Why is the allowable axial stress in tension (186MPa), allowable bending stress in T or C (205 MPa), allowable shear stress (140MPa) and bearing stress (232MPa) less than the minimum yield stress value?
2. What is the difference between yield stress and equivalent stress?
3. Equivalent stress is given as 279 MPa. Is it correct to use the values given in point no. 1 in the formula "[(Axial stress)^2+3(Shear stress)^2]^0.5" to derive this value of 279 MPa?
Sushant Goel
MSc Uni Stuttgart
Download Attachments:
Extract from Tata Structura_YST310.PNG

Posted via Email


Back to top 


sushant_goel Progressive Member
Joined: 15 Sep 2010 Posts: 42

Posted: Sun Jul 14, 2019 2:14 pm Post subject: Re: Query about Tata Structura steel mechanical propertie 


Dear Mr Upadhyay,
Thank you very much for responding to my query.
Regards,
Sushant Goel
u.mukesh wrote:  Hello Shushant
The permissible stresses are not equal to Yield stresses in any case.For instance axial tensile stress in Working Stress method is 0.6*fy (310x0.6 =186 MPa).
Even in limit state we restrict permissible stresses upto 0.87 fy.
Regards
Mukesh Upadhyay
On Thu, Oct 11, 2018 at 5:12 PM sushant_goel <forum> wrote:
Quote:  Hello,
Please refer to the attached extract from Tata Structura steel brochure which states the mechanical properties of YST310. I have the following queries and would be glad if someone could share their knowledge with me.
1. Minimum yield stress (310MPa) and minimum UTS (450MPa) is clear. Why is the allowable axial stress in tension (186MPa), allowable bending stress in T or C (205 MPa), allowable shear stress (140MPa) and bearing stress (232MPa) less than the minimum yield stress value?
2. What is the difference between yield stress and equivalent stress?
3. Equivalent stress is given as 279 MPa. Is it correct to use the values given in point no. 1 in the formula "[(Axial stress)^2+3(Shear stress)^2]^0.5" to derive this value of 279 MPa?
Sushant Goel
MSc Uni Stuttgart
Download Attachments:
Extract from Tata Structura_YST310.PNG

Posted via Email 


Back to top 


