Accession Number : ADA299093

Title :   An Analysis Into the Uncertainty of Stiffened Panel Ultimate Strength.

Descriptive Note : Trident scholar project rept.,

Corporate Author : NAVAL ACADEMY ANNAPOLIS MD

Personal Author(s) : Vroman, Robert H.

PDF Url : ADA299093

Report Date : 15 MAY 1995

Pagination or Media Count : 125

Abstract : The objective of this project is to determine the level of uncertainty associated with the ultimate strength predictions generated by the standard design algorithm used in stiffened panel design of ship structures. This investigation into the modes of ultimate failure of stiffened panels is divided into three approaches: experimental tests of grillages in the USNA Ship Structures Laboratory, analysis of historical stiffened panel test data found in the literature, and non-linear finite element analysis. By comparing the predicted failure stress and deflections between the various methods, the level and areas of uncertainty can be recognized and quantified. Three tests were conducted in the USNA Ship Structures Laboratory. The data from these tests were compared to the historical tests found in the literature. A statistical data analysis was conducted to determine the most important factors influencing the modeling bias associated with stiffened panel ultimate strength. The non-linear finite element analysis of the USNA grillage was able to model the buckling of the panel but could not solve for the post-buckling behavior. Further experimental tests and finite element models need to be tested in order to confirm the validity of some of the predicted values and the overall reliability of the method. (AN)

Descriptors :   *PANELS, *COMPRESSIVE STRENGTH, *SHIP STRUCTURAL COMPONENTS, TEST AND EVALUATION, COMPRESSION, STRESS STRAIN RELATIONS, DATA BASES, MATHEMATICAL MODELS, ALGORITHMS, UNCERTAINTY, TENSILE STRENGTH, STRESS ANALYSIS, EXPERIMENTAL DESIGN, FINITE ELEMENT ANALYSIS, STATIC LOADS, STRUCTURAL MECHANICS, DEFORMATION, DISPLACEMENT, STATISTICAL DATA, STIFFENING, DEFLECTION, RELIABILITY, MATHEMATICAL PREDICTION, RESIDUAL STRESS, BUCKLING, NONLINEAR ANALYSIS, FAILURE(MECHANICS), BIAS, SHIP HULLS, AXIAL LOADS, SURFACE TENSION, NORMAL DISTRIBUTION.

Subject Categories : Marine Engineering
      Mechanics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE