Publications

Publications

Uncertainty Quantification of Stresses in a Cracked Pipe Elbow Weldment

This paper, as Part II of a three-part series, focuses on quantifying uncertainty in finite element analysis by using a two-step method. It employs a 4-parameter logistic function and nonlinear least squares algorithm to estimate and extrapolate results to infinite degrees of freedom, demonstrated across four engineering problems. The study also highlights the superior performance of the hexa-27 element using a super-parametric approach.

EFFECT OF MESH QUALITY IN FINITE ELEMENT ANALYSIS OF CRACK-TIP STRESSES IN A CIRCUMFERENTIAL SURFACE

Robert Rainsberger Jeffrey T. Fong, Pedro V. Marca

This paper investigates errors and uncertainties in Finite Element Method (FEM) simulations, specifically focusing on those arising from mesh density and mesh quality. The authors propose a super-parametric method to generate mesh families and apply a nonlinear least squares fit using a 4-parameter logistic distribution to estimate the most accurate solution and its uncertainty. This approach allows for the ranking of solutions based on an "uncertainty metric".

Refined 3D Finite Element Modeling of Partially Restrained Connections Including Slip

A.M. Citipitioglu, R.M. Haj-Ali, D.W. White

This paper introduces a sophisticated parametric 3D FEM approach for analyzing partially-restrained bolted steel beam-column connections. It examines how varying geometrical and material parameters, including critical aspects like bolt pretension and slip, influence the connection's complex nonlinear behavior. The developed versatile modeling technique, which employs parametric meshing, enables accurate prediction and extensive parametric studies for a broad spectrum of connection designs.

Damping Modeling Strategy for Naval Ship System

Young S. Shin and Ilbae Ham

This report explores various damping modeling strategies crucial for naval ship structural design, addressing shock, vibration, and noise. It emphasizes the equivalent modal damping method for structural dynamic analysis and a methodology for estimating structural and material damping using single element models and experimental data, making it applicable to complex naval ship systems.

Investigation of Close Proximity Underwater Explosion Effects on a Ship-Like Structure

Keith G. Webster

This thesis investigates the effects of close proximity underwater explosions on ship-like structures using experimental finite element model tests and the Multi-Material Arbitrary Lagrangian/Eulerian method. It examines the propagation of pressure waves through fluid and their transmission to structures, while also highlighting the limitations of current methodologies in predicting long-term explosion effects.