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In the May/June 2011 issue of Rotoworld magazine there was an article discussing proposed updates to AS/NZS4766:2006 for polyethylene storage tanks. I have not been able to discover if any of those proposals regarding underground tanks have been adopted. They seem very conservative to me...

Hello forum members, I use FEMAP and NX Nastran Advanced NonLinear (Sol 601). I have been experimenting with large displacement and large strain options and see in the documentation thst various measures for stress and strain are used in the element formulations (Green-LaGrange, 2nd...

Hello forum members, FEMAP 11.1 occasionally gives Windows error and closes when analysis (SOL 101) is started. This has happened to me on two different machines, one running Windows 7, the other XP, both 64 bit, with the same file. I then exported the file as a FEMAP neutral, Version 11.0.1...

Hello forum members, I have been running test cases using shell-to-shell contacts where the shells are off-set from the contact surface. The NX linear contact solution 101 behaves as I expect: it will compensate for shell thickness and also for the shell offset using the Z-offset setting...

I am performing FEA on an assembly that includes rotomoldings with inserts. I have found some data for pull out forces for injection molded inserts but not for rotomolded parts. I am thinking of using the injection molded data reduced by a fairly large amount to compensate for different...

Hello forum members, I'm considering buying a new workstation. I use FEMAP and NX Nastran and often run non-linear Solution 106 problems. I was looking at the Dell 7600 with 8-core processors. (I currently use 4-cores.) Will NX Nastran use the 8 cores? I would probably get 64 Gigs of RAM...

I have been trying to find a listing of the constraint equations created when the CYSYMGEN command is added to my input files created in FEMAP. Most of the problems I've run with cyclic symmetry give reasonable results but sometimes results are far from what I would expect and I would like to...

I often analyze models created in SolidWorks for which my clients have done a preliminary analysis using the Simulation Express program included with SolidWorks. Sometimes I am asked why our results differ if we both are using solid elements. Does anyone know what kind of tetrahedron element...

Hello forum members, I have been experimenting with creep analyses in FEMAP 10.3.1b with NASTRAN NX. I have been using very simple models to gain insight into how the program works. I create an analysis set in FEMAP and then use the "Preview Input" option to create two subcases with different...

I have been doing Finite Element Analyses of a part and have been trying to find creep information for LLDPE. My client has already asked his supplier and got no help. (In fact supplier said "there is no change with time in the modulus") Temperature will not be elevated and I'm looking for 5...

I have molded a lot of CPVC, but I haven't worked with it since about 1990. I found molding it to be challenging, requiring meticulous attention to processing and screw geometry selection. A client has been told by a supplier that changes have been made in some CPVC formulations since then that...

Hello forum members, How much preload do you recommend for support pillars in a mold? Jerzy

I am working with a client who has taken in-house about 15 molds that had been built and run off shore. They have 100 mm locating rings; his presses have 4.000 locating holes in the platen. The rings vary from simple types to more complex recessed sprue, three-plate types. These molds will be...

I am running some initial samples on three molds using a heat-stabilized grade of nylon 6/6 colored with a light grey color concentrate. I have never run this grade of nylon before, but for over fifteen years I have used the same concentrate with a heat-stabilized grade of nylon 6 to mold many...

Does anyone know if this on-line magazine is being published? I paid for a subscription and received the initial issue, but the link to the site has appeared to be dead for quite a while. Thanks Jerzy

I'm considering an application which might require sequential gating (using valved hot runner gates) using the fluoropolymer ETFE. Has anyone used hot runners with this resin? Thanks Jerzy

I work with some people who use CFdesign to aid in pump design. They are looking to upgrade their computer (currently dual-processor 2.5 Ghz Xeon CPU's with SCSI drives). What would run analyses faster: two Dual Core Intel Xeon 5160 3.00 Ghz processors or two Quad Core Intel E5320 1.86 GHz...