Recent content by mcclain

davefitz, You observations would be consistent with the realization that Al Gore's "An Inconvenient Truth" was simply an infomercial for his carbon offset business in Europe. I think he made about $180 mil.

You should move this question to "Mechanical Acoustics/Vibration engineering". They live for this stuff.

I'm partial to Building Better Products with Finite Element Analysis by Adams and Askenazi. Pub: OnWard Press

http://www.fgg.uni-lj.si/kmk/esdep/master/wg11/toc.htm should show how to analyse this connection if you choose to go that way. Note that the highest loaded bolt pair in tension will be the pair at H1, given the general thicknesses indicated (see Figure 15 in the introduction section of Lecture...

Keep in mind that the "apparent" tensile strength of a bolt is considerably less due to the added torsional stress during torqueing, i.e., torqued tension vs. direct tension. See KulaK, Guide to Design Criteria for Bolted and Rivets, AISC 2001.

I meant, Are there any text books devoted to finite element analysis of pressure vessels?

Are there any test books devoted to finite element analysis of pressure vessels?

After you calculate your length of thread engagement required for thread shear strength (I recommend FED-STD-H28) be sure and add in allowances for tolerances and chamfers, etc. Your design length of engagement may be as much as 150% or more of the required length of engagement. Good luck, Mark

Could there have been some post curing during the wet conditioning?

Gent, Engineering with Rubber, indicates an empirical relationship between Shore hardness and initial Young's modulus.

The method you are using is applicable in situations whereby your stress is a "secondary stress". Per ASME "secondary stress: a normal stress or shear stress developed by the constraint of adjacent material or by self-constraint of the structure. Its basic characteristic is that it is...

"so my stress concentrations after the nonlinear analysis are lower than the yield but are higher than the allowable" Are the stress allowables applicable for stress results from an elastic - plastic analysis? Regarding stress concentrations, remember that with an elastic plastic analysis...

You could program the direct stiffness method as described in Dawson, T.H., Offshore Structural Engineering, Prentice-Hall, Inc. 1983.

According to Peery, D.J., Aircraft Structures, McGraw - Hill, 1959: "Many uncertainties exist concerning the stress distribution in fittings. Manufacturing tolerances are such that bolts never fit the holes perfectly, and small variations in dimentions may affect the stress distribution. An...

Should the buckling point be the minimum of the sencond derivative, i.e., the point with the sharpest downward concavity on the load shortining curve?