Skyhawk989
Aerospace
Hello,
My questions:
1) i have read agma 2OO1 c95 and find the geometry factors somewhat confusing. Difficult to analyze without a computer program or well defined gear tooth profile. Would it be safe to assume that the previous standard agma 218 would still be acceptable? why did they introduce such a tedious method of determining critical points, etc... ?
2) The agma 2OO1 introduces stress concentration factor. For static strength analysis, can i remove this factor? Considering that the root is case hardened, i dont want to remove the factor due to the brittle behavior of the case.
3) is there much difference between specs agma 2OO1 c95 and dO4?
4) The agma stress equations give the stress at the root of tooth on tension side...how about the compression side?
I noticed a very high compressive stress on compression side, especially at larger pressure angles. Should a FEA be performed to assess these stresses? i notice that geometry factor takes this into account to reduce the tension stress, which can be quite abit:
eg. pressure angle = 25, the compressive component (in addition to bending compressive stress) will be tan25* Wt = .466*Wt (which to me is significant even if the case can handle large compressive stresses)...do we simply rely on minimum case depth at root...similar to what Dudley recommends to ensure adequate compressive strength?
thanks
My questions:
1) i have read agma 2OO1 c95 and find the geometry factors somewhat confusing. Difficult to analyze without a computer program or well defined gear tooth profile. Would it be safe to assume that the previous standard agma 218 would still be acceptable? why did they introduce such a tedious method of determining critical points, etc... ?
2) The agma 2OO1 introduces stress concentration factor. For static strength analysis, can i remove this factor? Considering that the root is case hardened, i dont want to remove the factor due to the brittle behavior of the case.
3) is there much difference between specs agma 2OO1 c95 and dO4?
4) The agma stress equations give the stress at the root of tooth on tension side...how about the compression side?
I noticed a very high compressive stress on compression side, especially at larger pressure angles. Should a FEA be performed to assess these stresses? i notice that geometry factor takes this into account to reduce the tension stress, which can be quite abit:
eg. pressure angle = 25, the compressive component (in addition to bending compressive stress) will be tan25* Wt = .466*Wt (which to me is significant even if the case can handle large compressive stresses)...do we simply rely on minimum case depth at root...similar to what Dudley recommends to ensure adequate compressive strength?
thanks