Hi,
I am designing a pressure vessel (waste heat boiler) with EN code - EN12953 and flexible tubesheet design to be verified by FEA using EN code 13445.
Few questions:
1. For design by rule - for shell thickness - I am using PVelite but it has built in EN13445 code not EN12953. Is there a...
Hi,
I am running a static 2d axisymmetric analysis in different versions of Ansys and getting different results wrt deformation and stresses although everything is the same - model, boundary conditions, loads etc.
I am using APDL for the analysis. Just for information a legacy element BEAM 3...
Hi,
I am doing an evaluation with the thermal conditions (expansion coefficient) on - same temperature for the whole assembly - and other without thermal conditions - meaning that a constant temperature is given in both load cases, but thermal expansions are off (using APDL snippet) in the...
Hi,
I am doing an evaluation with the thermal conditions (expansion coefficient on)- same temperature for the whole assembly - and without thermal conditions - meaning that the temperature is given but thermal expansions are off (using APDL snippet.
When I see the equivalent stress for the...
HI,
I have a flexible tubesheet forging for which I am evaluating the stresses on the small fillet radii region of the forging to satisfy the global plastic collapse as per ASME Sec VIII Div 2 part 5
I have made SCL's on the part as shown. The red marked portions of the forging will have...
HI,
If the sum of principal stresses is coming to be negative (considering principal stresses with their respective signs "+ or -") and if this negative value magnitude i.e., absolute value is greater than the limit of 4S, will the local failure criteria be satisfied or not? The code does not...
Hi,
Instead of evaluating the algebraic sum of 3 linearized principal stresses to be less than 4S, if the algebraic sum of 3 principal stresses (not linearized)is calculated using a user defined formula in ANSYS WB i.e. s1+s2+s3 - and found to be less than 4S, is it safe to say that the...
Hi,
I am trying to analyze welds in ansys by modeling the weld as couplings (in a shell model) and postprocessing the data in an excel file to calculate stresses in the weld
In the post processing, I select each node (from a set of coupling having 2 nodes, I select one node) and write out the...
Hi,
I am trying to find the weld stresses (weld shear and weld tension) using the forces output in 3 -directions (Fx, Fy and Fz) using FSUM/PRNLD command in Ansys post-processing.
The mesh (SHELL281, 8 noded quadratic elements) is uniform in size (=10mm) across the model and the weld is...
HI,
I am doing an eigen value buckling analysis using ansys workbench. The FE model is 166° and not 180° (due to some assumptions).
The prestress is the elastic evaluation with primary loads (pressure and deadweight).
Will the multiplier from the 166° model be equivalent to the 360° model...
Hi,
In an elastic-plastic analysis, the required factored load combinations from table 5.5 of ASME Sec VIII Div2 part 5, the table has temperature (T) as one of the load cases in a load case combination e.g. 0.88*beta*(P+Ps+D+T).
So, when factoring the temperature, I have used the factor on...
Hi,
I have run an elastic analysis where the stresses were over the allowable stress values at some local zones (where local membrane > 1.5S). So, in order to see whether these stresses redistribute when yielding occurs I have gone for an elastic plastic analysis using the ANSYS plugin ASME...
thread794-492743
Hi,
In continuation of the thread mentioned here, I have a question. When we are evaluating the deformations in an elastic plastic analysis, what value of deformations do we say we are allowed to go upto if nothing is specified by the user of the vessel? I know that the...
Hi,
I have a question regarding the local failure criteria using the elastic plastic analysis using 5.3.3.1.
The operating temperature of a vessel that I am analyzing is 465°C and the design temperature is 495°C.
So while I am using the value of m2 from table 5.7 for "ferritic steels" it...
Hi,
I do not know if someone else has also encountered this but recently in ANSYS 2019R3 I have experienced different reaction force values (at the displacement boundary condition) for a pressure vessel with two different mesh element order under mesh tab of workbench- 1)program controlled and...
Hi,
I am doing a Finite element evaluation of a perforated tubesheet (U-tube exchanger -thick tubesheet currently) for a superheater and want to optimize it.
I am making use of Annex 5-E of ASME div 2 part 5 of modeling an equivalent solid plate. Since the loading is not axis symmetric so I...
Hi,
I have a top cover assembly wherein I have a tube (with a notch), a ring which sits in the notch, lower loose flange and top flange and bolts to connect these flanges.
I am trying to analyze the stresses in the assembly for temperature (T) and pressure load (P). Needless to mention I need...
Hi All,
We are looking for training in ASME section VIII Div. 2 part 5 with a little overview of Div. 1 before going to Div.2 part 5 training.
In short training should cover prerequisites (if there is) for Div.2 part 5 training (Div.1 ?) apart form the Div.2 part 5 itself.
Any help would be...
Hi,
I am trying to find out the no. of cycles an equipment can withstand with respect to the strain range (in %).
So I have simulated (in ANSYS) full load (temp.) and then unload (ambient) for 5 loops i.e 5 loading and 5 unloading which makes 10 steps.
Now I want to see the plot of strain...
Hi,
I am evaluating tubesheet of a reformer and have got the design temperature of the tubesheet and primary plus secondary stresses (application of pressure and temp. profile). Now while comparing with the allowable value of Sps as given in 5.5.6.1 (d) , I should take the larger of the two...
