Hi.
according to ASME Viii Div2 Figure 5-1
the criteria for Sum of PL+PB+Q+F is 2x Sa.
I always consider my maximum stress to be less than it.
But in 2017 version, this criteria was just Sa.
Am i right?
Hi,
As you know, in edition 2017 of asme viii-2, it has introduced the classes for vessels which made some challenges for me.
According to edition 2015 part5, I always perform FEA with S.F=2.4 and in E-P analysis, load factor 2.4. But in new edition, it seems that i have to consider my cases in...
Dear friends,
I need help for design a reducing Tee.
As you know according to MSSP-75 (B16. 9) we have to perform a proof test on fittings based on actual tensile strength and nominal pipe thickness.
In my case (Tee 56-30) with pipe line thickness 31.75 the proof test pressure is 300 barg and...
Hi,
According to table 5.5 of ASME VIII-2 we can see two different load factor for Local Criteria (in brief):
1.7*P
2.3*P (in Hydrostatic test)
I want to know since we have Hydrostatic test with 2.3*P and calculating "εL:limiting triaxial strain" in that load case, does it have a meaning to...
Hi,
I decided to perform an E-P analysis according to the ASME VIII-2 part5 criteria so i checked 2 ways to assign a characters to the material:
1-Usign a Non-linear material of ANSYS which used bi-linear isotropic hardening and tangent modulus of 1.45Gpa for structural steel. in this...
Hi,
Consider two analysis of Finite element model:
1-Linear Elastic (Large deformation is off)
2-Elastic-plastic analysis of a same model (large deformation is on)
Which one shows us the real deformation of a component? it is so important for me according to design the sealing zone of...
Dear members,
I use Ansys for Elastic analysis of a part according to ASME VIII-2 Part5 and i have 2 questions:
1- Should i turn of "Nonlinear effects" in Geometry material properties or it automatically use linear analysis if we didn't assign a nonlinear properties (such as Tangent modulus) to...
Dear Friends,
I have installed Ansys 15 on my system although i have Ansys13 too. It doesn't have any problem in analysis but it doen't use the maximum capacity of my cpu (at most 50% although my ansys 13 has been used 100%)
I changed cpu number to 8 in settings but the problem remains.
I want...
Dear Friends,
As you know, in VIII-2 part5 there isn't a clear rule to consider Hydrostatic test in Design of equipment.
But i am working on an equipment which base of design is on Hydrostatic test condition and Design condition is not critical.
Is it possible for me to use Part4 Criteria for...
Hi guys,
I am really confused about what said in VIII-Div2 Part5 about Local stresses and i need your advices.
I decide to analyze a type of flange that you can see in image below which contains a FEA of a slice of flange.
As you see, stress in edge of teeth is more higher than middle of teeth.I...
Dear friends,
I use elastic stress method to perform finite element analysis with Ansys (calculating mem and bending stresses) but i want to use limit load and elastic-plastic analysis too.
I read asme2 part5 more and more but i have a lot of doubt in my knowledge for these methods.
Can anyone...
Dear friends,
I’ve analyzed a part of pressure vessel (quick opening closure) with ANSYS and design it according to ASME VIII Div2 Part5. So I have some questions:
1- In some zones like small fillets and sharp edges (see pic1), there are some local stresses higher than yield strength of...
Dear friends.
Can anyone tell me when should i activate large deformation when using finite element analysis?
I have analyzed a pressure vessel's part (Manhole) with steel structure and trying to find out the real deformation in sealing zone. I don't know which is real deformation: Large def= on...
