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Anyone have experience with Section 12 Vibration Test of ISO 19879? Seems straight forward but description is a bit confusing: Pressurize to working pressure Apply bending stress level to 25% of the minimum yield strength of the tube. Section 12.2.5 states, "apply a bending load to the...

"right now I'm assuming that the greatest induced moment will be at resonant displacement. So I've estimated the reaction moments based on this and found the stress induced in the tube (assuming 2-D movement)." How did you estimate this induced moment (which leads directly to the stress)? To...

Good discussion on frequency effects. I agree that the first mode is probably the only one you'll need to worry about. The displacements at the higher mode frequencies become significantly less. You have to have displacement to get fatigue. How about his primary goal, predicting the...

Metal Coatings International has a zinc and aluminum flaked coating (called Dacromet) they can apply to capscrews for corrosion protection and very consistent "K" factor (torque tension relationship). I believe the automotive industry uses this coating. I've seen some remarkable data on...

What types of applications have you successfully and not successfully used Belleville washers? I have an application where multiple M20 grade 10.9 capscrews are used to hold a cover on a housing. The external loading into the cover sometimes is high enough to cause the cover to slip...

Be sure the material the dowel is pressed into and reacts against across the joint is strong enough to carry those shear forces. We use a lot of gray iron and nodular iron castings. Our dowels are for location only (centerlines for shafts and bearings). To carry shear load into the mating...

Stresscoat is still available from Stresscoat, Inc Upland, California. 909/981-6990 The stuff is not easy to work with and requires experience to apply. It seems the consistency of batch to batch is spoty. For best results, it requires tightly controlled temperatures to cure and crack...