Analysis of Bending a Square Ceramic Plate under Strong Rotation
Abstract
The U.S. Army has a continuing interest in smart weapons systems. Among them are projectiles employing independent logic. Smart weapons use printed circuitry with chips supplying the smarts for the system's autonomic functions. Experience has shown that considerable thought is required to design circuits that remain effective when subjected to severe environmental conditions. Launch conditions can place a projectile's components under axial loads as high as 40,000 g's, with spin rates up to 270 r/s and balloting loads up to 2,000 g's. Although short in duration, these loads can break even the most robust design. Unfortunately, when failure occurs, it is not obvious that a loading mechanism caused the problem, hence, making it difficult to make design corrections. This report gives a simplified technique to determine if spin loading can break an internally housed chip. In particular, radial loading on the sense-and-destroy armor missile (SADARM) projectile's 68000 chip is examined. The methods employed here offer a quick means to eliminate potential problems, without employing sophisticated finite element techniques. Thin-plate theory is assumed adequate for determining stress levels in this chip, which is located off the rotation axis. Approximations for the chip's loading and boundary conditions are considered. Computational results are presented and examined.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2000
- Accession Number
- ADA383257
Entities
People
- Don Carlucci
- Gene R. Cooper
- Stephen A. Wilkerson
Organizations
- United States Army Research Laboratory