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Found 34 results

  1. Hello, In fatigue analysis in Optistruct, Do we also have to multiply the fatigue strength value by 2 while defining FL in MATFAT like we are doing for SRI1 value?(stress range= 2* stress amplitude) e.g if the fatigue strength of a material is 100 MPA then do i have to put 200 for FL in MATFAT? TIA
  2. Hello, I am doing fatigue analysis using SN life approach....I wanted to know what is the effect of frequency of loading cycle on fatigue life and damage? For example if the frequency of load cycle is doubled what will be the life and damage? Thanks in advance.
  3. In SN life fatigue analysis carried out in optistruct, we get output of life and damage only. How to get dispacement and stresses induced due to fatigue loading in output? Thanks in advance.
  4. Hello all, I have done static analysis of the structure using static load case of 971N. I have applied Fully reversible sinusoidal curve (100 cycles) for fatigue analysis in optistruct. SN curve is calculated in optistruct using UTS. After analysis i am getting minimum number of cycle as 1.581e-2 which seems unrealistic. What can be the problem?
  5. I came across in the documentation that the life is calculated using the formula. Sr = SRI1(Nf)b But, even after maintaining the co-efficients, TRTMENT, FINISH and [KF] as 1, the results are off (when compared with the manual calculation using the above mentioned formula) by a random factor (approximately 0.5), for each unique component I take for fatigue analysis (Refer image attached). Why is it so? What is the calculation happening at the back end of the software? Why is the factor 0.5 coming into play?
  6. A propeller shaft experiences opposing torques on its ends, while rotating. What types of analyses are generally carried out on a propeller shaft, apart from static, modal, fatigue? What are the reversing loads to be given in a fatigue analysis? (The only reversing force that comes to my mind is the shaft's self weight, acting sinusoidally. Are there any other reversing loads in a rotating shaft?)
  7. Any Idea, how one can perform fatigue analysis of structural ceramic materials? Thanks.
  8. I was doing fatigue analysis on a model and I cant find the option for cyclic loading while defining the loading history. Also the units of my model are mm,g,s which gives stree units in pascals so should I define everthing in pascals including the ultimate tensile strength? Also in the load time history should the input be time and forces or time and g(acceleration) values?
  9. Hi...I figured out misspelling on hyperworks help "fatigue analysis" On optistruct fatigue analysis help SWT equation is missspelled.
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