Design of a Fatigue-Resistant Press Used to Contain 3,000 Kips of End Load as a Result of High Pressure Cyclic Testing of Open-Ended Cylinders
Abstract
To determine the safe service life of cannon tubes, several samples must be cyclically tested to failure. Since testing these large diameter, open- ended cylinders requires pressures as high as 100 Ksi, the fatigue-loading conditions on the testing equipment are very demanding. One method for reacting the very high-end loads associated with testing these open-ended cylinders is through the use of an external press. The press design discussed in this report deals with the design procedures involved in developing an infinite life press that can react end loads as high as 3000 kips. This press design involves the use of two low deflection platens connected by two high strength posts. To design an infinite life threaded post, several methods of fatigue life enhancement can be applied. The most effective method of life extension is to preload the threaded post producing a high mean stress, but reducing the alternating stress or stress amplitude. This avenue of enhancement became the method of choice. Producing sufficient preload on a post with a diameter of 7 inches and a length of 115 inches by mechanical means requires torque-producing equipment presantly available. By using electric heating elements inserted at the center of the posts, the posts can be expanded and the preload applied. Safe service life, Soderberg criteria, Stress amplitude, Alternating press
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1994
- Accession Number
- ADA279921
Entities
People
- Joseph A. Kapp
- Michael J. Audino
Organizations
- United States Army Armament Research, Development and Engineering Center