Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. struclearner

    Spacer's Dimensions used in a Bolted Joint

    Hello LittleInch, Thanks for your time for the response. The spacer is a cylindrical part used between bolt head and first member of the joint to increase the length of the bolt, where clamped members are not thick enough for a proper Joint and Bolt stiffness ratio. The washer is used between...
  2. struclearner

    Spacer's Dimensions used in a Bolted Joint

    How the spacer's dimensions i.e. Outer diameter and thickness (Inner diameter) used in bolted joints, are determined or is there a standard/recommendation for the sizes of the spacers with respect to bolt size. Any reference to the technical literature/book is highly appreciated. Thanks & Regards.
  3. struclearner

    Reaction Force Distribution in ANSYS Workbench!

    In ANSYS Workbench, the Reaction Force of a support can be determined by the Probe tool, which gives the total Reaction Force. Some FEA programs give the Reaction Force distribution on the nodes of the support of FE model. Is there a way to find Reaction Force distribution on Nodes in ANSYS...
  4. struclearner

    Time Domain Test Data Interpretation in Frequency Domain!

    When a certain value of test data repeats or reoccur during the test, in Frequency domain, how this will be stated. Frequency is usually referred as Number of Time/Unit Time, but the value occurrence in Time domain is not per unit time it is during the test whole time. For example, in strain...
  5. struclearner

    Beams Modeling Bolts “Behavior” Options

    Thank You very much, NRP99 for the explanation and detail reply. The modeling of Bolt Beam connection to Head/Nut Interfaces through beams of certain cross sections gives the forces/displacement determination in ANSYS Workbench, I am not sure at this point, what will be usage of it. NASTRAN...
  6. struclearner

    Torque of Bolt with Spacer in a Bolted Joint

    Are the bolts with spacers in Bolted Joint tightened to their maximum torque? The Clamping Force is transferred to members through spacer interface area with upper member. This does not cause high stresses due to less interface area due to spacer. Thanks for your help.
  7. struclearner

    Beams Modeling Bolts “Behavior” Options

    In Ansys, when the bolted joint is modelled by using Beam Elements, there is options of defining the Beams as, Deformable, Rigid and Beam. If I understand correctly, this is the area stiffness, where Beam is connected to the members of the joint, that is at bolt head and nut interfaces...
  8. struclearner

    Fracture Strain Value Exceeding 1 from a Tension Test

    When quoted Fracture Strain Ɛf value from a Tension Test is greater than 1, it means the change in length is larger than original length of the test specimen. Shigley’s Mechanical Engineering Design, Tenth Edition, book has following Fracture Strain Ɛf values listed in Table A-22 on page 1051...
  9. struclearner

    Q8T6_ANG Keyword on NASTRAN Statement

    Dears, I am getting User Warning Message 5276 "ELEMENT 2055575 HAS TOO MUCH CURVATURE AND MAY YIELD POOR ANSWERS", The tolerance may be adjusted with Q8T6_ANG keyword on the NASTRAN statement. The analysis job is not completed after the number of warnings exceeds a certain number. How the...
  10. struclearner

    G Loads for Half Symmetric FE Model

    Thanks, FEA Way
  11. struclearner

    G Loads for Half Symmetric FE Model

    G (Gravity/Acceleration) load, for Half FE Model, utilizing the symmetry of the structure, will be the same as for full model, because the g loads produce inertia force calculated from F = ma, on the structure. I appreciate, your inputs and valuable suggestions, if this is not the case.
  12. struclearner

    Book to Understand PSD and FFT for Time Domain Data to Frequency Domain Conversion!

    Dears, I appreciate your help by referring to a very basic and preliminary book to understand the conversion of Time Domain data to Frequency domain data, different algorithms for the purpose and their explanation along with plenty of solved examples, also explaining the...
  13. struclearner

    Alternating Stresses for Fatigue Calculation: Same Stress Component or Stress with higher magnitude?

    To calculate Fatigue using alternating stresses, from two loading conditions, if Max. Principal Stresses from one load is selected, for the second load, same Max. Principal Stresses would be selected or the stress component with higher magnitude will be selected, if Min. Principal Stress value...
  14. struclearner

    Coupling of Translational Mass Components, What This Mean?

    Dears, While reading the MSC/NASTRAN, "Linear Static Analysis" User' Guide, came across the following sentence, "The principal mass axes are axes that have no coupling between the translational mass components." What is the concept/meaning of "Coupling between Translational Mass Components."...
  15. struclearner

    Spring Elements (CELASi) in NASTRAN

    Dears, NASTRAN has 4 different Spring Elements, CELAS1, CELAS2, CELAS3 and CELAS4. One difference between these elements is, how these are defined, by mentioning to PID or specifying K (Stiffness) values. I could not find the mentioning of any other difference between these elements in NASTRAN...
  16. struclearner

    Different Spring Elements (CELASi) in NASTRAN

    Dears, NASTRAN has 4 different Spring Elements, CELAS1, CELAS2, CELAS3 and CELAS4. One difference between these elements is, how these are defined, by mentioning to PID or specifying K (Stiffness) values. I could not find the mentioning of any other difference between these elements in NASTRAN...
  17. struclearner

    Normal Modal Analysis Deformation Values after Displacement Normalization

    I was able to get correct Normalization Eigenvectors by maximum deformation by using PCG Lanczos Eigen Slover in ANSYS Workbench. The other program has only Lanczos listed in the solver option, it gives the deformation values less than unity for some modes after using Normalization by Max...
  18. struclearner

    Normal Modal Analysis Deformation Values after Displacement Normalization

    Dears, When the Normal Modes from FEA Modal analysis are normalized by displacement, the maximum displacement in a mode is used to get the unit value and the relative displacement values at the other areas of the structure. Is this possible that the maximum deformation values after normalization...
  19. struclearner

    Vibration analysis of Structure attached to Rotating Machinery

    Dears, How the speed in rpm of a rotating machinery like an engine or motor can be used to compare the natural frequency of an attached structure. For example, what could be the excitation of a bracket with natural frequency in the range of say, 10 Hz to 50 Hz, attached to the engine, which is...
  20. struclearner

    Yield to Tensile Strengths Ratio Threshold Values for Ductile Materials

    'Ductility is usually expressed as a percent elongation in a 2-in gage length. A ductile material has a value greater than 5% and a brittle material less than 5%." Reference Machine Design Theory and Practice Aaron D. Deutschman Walter J. Michels Charles E. Wilson

Part and Inventory Search

Back
Top