Cross Sectional Constants and Stress Distributions of Thin-Walled Sections
Abstract
The equivalent beam model is widely used for predicting strength and vibration of a ship hull in a preliminary analysis. It can also be used for checking results in a large finite element model and for parametric studies of ship behaviour. This method treats a ship hull as a series of prismatic segments connected together. Each segment has its sectional properties, real and virtual masses. The program SCRAP was developed for calculation of cross sectional constants and estimation of mass properties. It prepares input data files for the finite element programs VAST and TORSON and interprets the analytical results. SCRAP can be only used for some specific sections at the present time. For arbitrarily oriented sections it may give and incorrect shear centre and warping constant and thus the wrong stress distributions. This report presents the mathematical derivations of the equations used for the calculation of cross sectional constants and stress distributions of thin-walled sections. As an improvement over the current SCRAP program, these equations are applicable to any shape of cross section, both open and closed, and are independent of the orientation of the cross section. A computer-oriented step-by-step procedure based on these equations is outlined. Several examples are also presented to verify the procedure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1992
- Accession Number
- ADA249886
Entities
People
- Thomas S. Hu
Organizations
- Defence Research and Development Canada