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  1. mikycampo

    Best books for acoustic beginner

    I'm a beginner in acoustics engineering. Someone can help me chose a good "for dummies" intro book? Thanks Michele
  2. mikycampo

    ASME 2007 SECTION VIII - DIV 2 - Fatigue assessment 5.5.4

    Dear all, i'm reading the new ASME 2007 sec VIII div 2 code and i'm facing some problems with the elastic-plastic stress analysis. In particular, chapter 5.5.4 describes two method to perform fatigue calculation in an elastic-plastic stress analysis: the "cycle-by-cycle analysis" and the...
  3. mikycampo

    Micro and macro residual stress due to machining

    In a manufacturing chain, Macro-scale residual stresses are introduced in a speciman by heat treatment, welding or other manufacturing process occuring before machining. These residual stresses are self-equilibrated before starting material layers removal in machining. When material has been...
  4. mikycampo

    Wood milling forces

    Dear all, I need to check stresses in a wood milling machine. I search on my books but I've data only for steel as milled material. I'd use the following formula to compute tangential forces acting in the milling cutter: FT = ksm * (va/(z*n)) * sqrt(p/D) * B where va: cutter/piece advancing...
  5. mikycampo

    differences between harmonic analysis ans spectrum analysis

    Dear All, can someone explain me the theoretical difference between an HARMONIC RESPONSE ANALYSIS and a SPECTRUM ANALYSIS? I'm going to analyse a piping system subject to acoustic inducted forces, given to me in Force-vs-frequency form. Thanks again, Michelebold
  6. mikycampo

    structural verification

    Finally, if I've understand, I must check for allowable stress in three separate cases: 1. dead weight + internal pressure (primary stress) and check my stress intenity levels with Sh 2. thermal, imposed displacement and constraints (secondary s.) and check my stress intensity level with Sh...
  7. mikycampo

    structural verification

    Dear BigInch, My explanation was quite bad (my english is quite bad). You understand correctly my answer: I'd like to know "loads and forces from other causes" as stated in 301.6. In my analysis, I've considered TOGETHER dead loads, live loads(quake and wind in my application), internal...
  8. mikycampo

    structural verification

    Thanks BigInch, I've red several times my code and now your answer, but I cannot find the combination "op.pressure + op.temperature" in stress verification. On the contrary, the combination "op.pressure + op.temperature" must be used in supports' loads and foundations' loads calculation. is it...
  9. mikycampo

    structural verification

    I'm doing a structural verification of a piping system. Is it correct to check for allowable stresses in separeted cases: deadweight+prssure nad thermal loads? I mean: i've checked if maximum stress intensity is under the allowable stress for deadweight+pressure and than in a separate analysis...
  10. mikycampo

    astm a694 f60

    dear all, i cannot find mechanical properties of ASTM A694-f60 steel i need: allowable stress (20°C) yield strength (20°C) ultimate tensile strength (20°C) young modulus thanks michele
  11. mikycampo

    Nozzle to Vessel flexibility simulation

    Thanks. But in your formula I don't know what is "I" parameter! Last question: from the end of the "virtual element" to the axis of vessel (simulated by beam/pipe elements) do you think I must provide a rigid element? Bye Michele
  12. mikycampo

    Nozzle to Vessel flexibility simulation

    Thanks C2it, I don't use a plate elements model, because i've more than 50 different nozzle / vessel connections and it will become too expensive for me to make a model for each nozzle. Thanks for Kellogg formula, but same data lakcs: - which section must have the virtual element? - which...
  13. mikycampo

    Nozzle to Vessel flexibility simulation

    thanks a lot for the answer. Where I can find, in the web, the formulas to design the equivalent beam to simulate the shell/nozzle flexibility? Or how I can use the bs5500 annex G formulas: i've red them a lot of times but i cannot understand how to evaluate the parameters to give to a beam...
  14. mikycampo

    Nozzle to Vessel flexibility simulation

    Dear all, i'm analysing the flexibility of a petrolchemical plant using ansys piping capabilities. The model includes some vessels connected by piping systems. I've modeled the vessel and the pipes with PIPE16 and PIPE18 elements. My problem is how to simulate the beams connecting the axis of...
  15. mikycampo

    Piping stress Analysis with ANSYS

    Dear all, I must perform a piping stress analysis in order to evaluate the ground reactions and the nozzle forces in a complete piping model. I'l use ANSYS. Someone can indicate me some tutorials or guides to learn how to model my piping system? There's any examples to benchmark my procedures...
  16. mikycampo

    internal pressure can influence natural frequencies in a steel pipe?

    thanks a lot everybody! There's someone that have used ansys pipe elements with internal pressure to do a modal analysis, experiencing a variation in first six frequency, increasing the internal pressure in a simple catilvered pipe? thanks again
  17. mikycampo

    internal pressure can influence natural frequencies in a steel pipe?

    dear collegues, i cannot understand if internal pressure can influence steel pipe natural frequencies. i've modeled a steel pipe in ansys using PIPE16 elements and solid elements. I've fixed supported both the models in one end. For each model, i've made two simulation: with and without...

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