# Iskw

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1. ## How do I obtain axial force & moment ?

Dear Sirs, I am now comparing the result of stress analysis done by 1-d element (by AutoPIPE) and 2-d element (by Hypermesh) on same model. According to the result, I got almost same result on model's deformation (displacement). So I thought it was successfully completed, then next I compared the other calculation result. However, as for the Axial force and Z-aixs moment, I couldn't find any similar result between the result of 1-d and 2-d. I assumed that axial force at certain position of pipe in 1-d is equal to the summation of "Element force" of "one lap" of 2-d pipe element, but the result was wrong. How do I obtain the axial force in 2-d model which is equal to that obtained in 1-d model ? Currently I was referring the "global system's XX direction" of "Element forces [2d]" but was I referring the wrong output ?
2. ## How to model pipe's guide support ?

This is an additional question. As for displacement, ASME's example and Hyperworks's output were almost same. (except the Y-displacement at Node 20) Therefore, I assumed my model and analysis went well, then I thought other output such as stress, axial forces, and moments were same value. (refer to below screenshot) However, other value such as axial forces and bending moments are quite different from HyperWorks's output. Am I comparing the wrong value ?? I think axial force (each X-axis and Y-axis) can be compared by ELFORCE(each XX and YY). In hyperworks, following SI unit were used: mm, ton, N, MPa My hm model and fem and h3d are attached fr your reference. above result can be referred in Subcase 1: Gr+Press+Mass+Thermal Thank you. Meshedmodel.hm Meshedmodel.fem Meshedmodel.h3d
3. ## How to model pipe's guide support ?

Dear Mr. Rahul, Thank you so much for your reply. The problem is the vertical support at node No. 20 in ASME analysis example. Firstly I tryied linear static analysis by simply attaching SPC with DoF of (2) in order to fix only the vertical(Y-axis) movement. However, the result was not the same as the ASME example's result. Please see the below screenshot. What I really have to create is vertical constraint at Node 20's grobal position, but above SPC is vertical constraint of "local" (i.e. element's) position. Therefore the SPC's position was moved to X-axis forward because of thermal expansion, but I want to create the vertical constraint which are not affected pipe's deformation. The reason why I want to analyse by non-linear is that the element stress of this example depends on the structure's deformed position. following is the image of what I want to do.
4. ## How to model pipe's guide support ?

Dear Sirs, I'm trying to solve the pipe stress analysis according to the example ASME B 31.3 appendix S Fig.301.1, shown in below URL. LINK: ASME B31.3 pipe analysis example (page 21 & 22) I made the most of the pipe model except the pipe support at the node No.20. No.20 support is the constraint of vertical (Y-axis) movement of the pipe, so firstly I made the SPC with dof of "13456" aroud the pipe, but the analysis result showed unexpected movement. My SPC is fixing the vertical movement of "node on pipe surface", but I have to made is fixing vertical movement of all pipe elements passing through at the node 20. Therefore I have to made some constraint at the node No. 20 in global coordinates, not at the node on the pipe surface. Please refer to the attached .hm model. I assume this is non-linear analysis, but I have'nt done such analysis so I dont know what to do. I would appreciate any advice. Thank you in advance. Nonlinear.hm

6. ## OS-1085: Linear Steady State Heat Convection Analysis

I 've downloaded the captioned tutorial pdf and .fem deck data from Altair Connect. Importing "Thermal.fem" finished sucessfully, but, At Step 5, There is no node numbered "4679". (I searched the node by ID, but HW shows "No change. Total selected 0." ) I would like to know how to find it or if there is specific setting of importing the .fem file. I am using Hypermesh v14. Thanks in advance,
7. ## How to show bending stress of the shell element ?

Thanks all ! What I want has been achieved by creating the result of { Z1(or Z2) - Mid } layer's von mises stress in "derived results"
8. ## How to show bending stress of the shell element ?

Sorry for confusion. Please find attached picture. In this picture, the (1) shows the mises stress at the middle of the thickness of shell element. (2) shows the mises stress at the each surface of the shell element. in other words, the mises stress value of Z1 and Z2. The stress value of (2) is consists of (membrane + bending) stress, so I thought that I can extract the bending stress (3) from (2) - (1). As for an individual element, I can obtain the (3) value by hand calculation, but I want to get the contour plot of the (3) = (2) - (1) at whole model. Or is there any direct method to plot the contour of the bending stress ?
9. ## How to show bending stress of the shell element ?

As far as I understand, the mises stress at the middle of the shell element is membrene stress, and the mises stress at the surface of the shell element is sum of the membrene stress and bending stress. and the hyperview can show the stress of the mid layer and both surface layer of the elements.(Z1, Z2, or Max) How can I show the contour plot of only the bending stress of the element ? I mean that I want to get the contour plot of value of ((Z1, Z2 or Max) - Mid layer ). Thanks for your help in advance.
10. ## How to add pressure on the cylindrical solid element?

Sorry but I only have a HyperMesh 13. and additionaly, the second screenshot was wrong (The whole inside of cylinder is red) because it was just the component color, not the contour of stress distribution. the contour of shell element shows similar distribution that the solid element shows. I am sorry for the confusion. The screenshot has been revised.
11. ## How to add pressure on the cylindrical solid element?

Hello. I did the analysis according to the above method. I have some questions. 1. The analytical value of tensile stress and its distribution of the solid elements are close to the theoretical value. However, the tensile stress that of at the shell element are bit different from the theoretical value, and its distribution is also different from theory. ( Please refer to the following picture.(these 2 shows the stress of YY direction in grobal coordinate system) ) Can I ignore (exclude) the stress and its distributions of the shell element because it is just a "dummy" element ? If I cannot, is any constraints or settings needed ? Upper: Stress value and distribution at solid element Lower: Stress value and its distribution at shell element (inside of cylinder) Theoretical stress value: 78 MPa Analytical stress value(without shell): 72MPa Analytical stress value(with shell): 91MPa 2. Is this the only way to add the pressure on the solid element ? (Createing dummy shell element on the solid element, and add the pressure on the them) Red face: Shell element extracted from Solid element Blue arrow: Inner pressure Brown element: solid element
12. ## Error during element quality check (PENTA)

Hi. I am analyzing cylindrical pressure vessel with fillet at the inner bottom corner. (Pls see attached picture) During the analysis using Optistruct, it stopped and the error message said that "Element # 2575, element type PENTA" the element was at the tip of the fillet. I know removing the fillet is the one of the best way to gain the quality of elements, but I want to analyze the exact model with fillet. Please tell me how to solve this problem. In above picture, brown is solid element and blue is shell element extracted from the face of the solid element in order to add a inner pressure. I am using HyperWorks ver.13. Thank you.
13. ## How to add pressure on the cylindrical solid element?

Dear Mr.Rahul and Mr. Prakash. Thank you for your advice. Calculation was finished properly by addring PSHELL property and material to extracted element. To Mr Rahul, Thank you for your update. it worked. Picking face of solid element is available only with HyperWorks 14 ? I am using HW 13. Best regards,
14. ## How to add pressure on the cylindrical solid element?

Dear Mr. Rahul, Thank you for your assistance. I am using Optistruct so I sent .fem file (and also .hm, .h3d file for your information.) to your dropbox. Best regards,
15. ## How to add pressure on the cylindrical solid element?

Note: about question no.2, I added the property of solid element to the extracted component, but the result did not change.
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