Calculating Contained Firing Facility (CFF) Explosive Firing Zones

Lyle, J. W.

Lawrence Livermore National Laboratory

关键词: Stresses;    Lawrence Livermore National Laboratory;    Roofs;    Cameras;    36 Materials Science;   

DOI  :  10.2172/15005420
RP-ID  :  UCRL-ID-132204-REV-2
RP-ID  :  W-7405-ENG-48
RP-ID  :  15005420

美国|英语

来源: UNT Digital Library

【 摘 要 】

Revision 1 of this document presented a method of calculating the CFF explosive firing zones that was based upon the peak average pressure on the various elements of the firing chamber as explosive weights and locations are changed. That document was reviewed internally at LLNL and reviewed by the design contractor of the facility. The contractor's responses generally confirmed the validity of the peak average pressure method, but noted that the shearing stresses at haunches may exceed the design values when explosive charges are moved towards comers. The concept of a dynamic load factor is introduced in the dynamic analysis section of Reference 5. A method is shown there whereby the response of the major elements of construction can be calculated from the knowledge of the peak average blast pressure averaged over the surface considered. the length of the pulse, and the natural period of vibration of the element. Quazi Hossain also suggested this method of analysis in Reference 2. The major elements of the Firing Chamber are the four walls, floor, roof slab, camera room overlay structure, inclined plate, bullnose, and the two doors. Except for the bullnose, their response has been calculated for a number of explosive weights and locations and compared with the design calculations. This has led to a more conservative drawing of the firing zones. As suggested by the contractor the shearing stresses at a wall-haunch comer were calculated as a function of charge location and compared with the design calculations.