Strength Assessment of a Pressurized Thick-Walled Cylinder Using Structural-Thermal Coupled Finite Element Analysis

2007 ◽  
Author(s):  
John Feldhacker ◽  
Zhong Hu ◽  
Fereidoon Delfanian
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Damage ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Thick Wall ◽  
Firing Process ◽  
Surface Erosion ◽  
Element Analysis ◽  
Strength Assessment

Upon analysis, thick wall cylinders designed for use in cannon barrel applications experience thermal and mechanical loading very near their fatigue limit. Chief factors in determining the lifetime of a cannon barrel involve internal thermal and mechanical damage caused by projectile firing. The most significant damage experienced in the cannon barrel is surface crack propagation which aids in surface erosion and fatigue failure. Adequate knowledge of these failure phenomena and the ability to predict the lifetime of gun barrels will greatly increase the successful application of their designs. This study will investigate three-dimensional stress of a pressurized thick cylinder using computer simulation based on structural-thermal coupled finite element analysis. The effects of high temperature and high pressure, as well as nonlinear material behavior, on stress-strain distribution during the firing process will be evaluated. This computer-based stress analysis will prove to be a valuable tool for assessing strength and forecasting the lifetime of cannon barrels.

Finite Element Analysis on Nitinol Medical Applications

2002 ◽  
Author(s):  
Xiao-Yan Gong ◽  
Alan R. Pelton
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Element Analysis ◽  
Highly Nonlinear ◽  
Device Applications ◽  
Specific Material

Nitinol, an alloy of about 50% Ni and 50% Ti, is a very unique material. At constant temperature above its Austenite finish (Af) temperature, under uniaxial tensile test, the material is highly nonlinear and capable of large deformation to the ultimate strain on the order of 15%. This material behavior, known as superelasticity, along with its excellent biocompatibility and corrosion resistance, makes Nitinol a perfect material candidate for many medical device applications. However, the nonlinear material response also requires a specific material description to perform the stress analysis. The user developed material subroutine from HKS/West makes the simulation of the Nitinol devices possible. This article presents two case studies of the nonlinear finite element analysis using ABAQUS/Standard and the Nitinol UMAT.

Creep Life Simulation and Assessment of High Temperature Piping Systems and Components

2012 ◽  
Author(s):  
Brian Rose ◽  
James Widrig
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Temperature ◽  
Creep Behavior ◽  
Material Behavior ◽  
Piping System ◽  
Remaining Life ◽  
Creep Life ◽  
Element Analysis ◽  
Piping Systems

High temperature piping systems and associated components, elbows and bellows in particular, are vulnerable to damage from creep. The creep behavior of the system is simulated using finite element analysis (FEA). Material behavior and damage is characterized using the MPC Omega law, which captures creep embrittlement. Elbow elements provide rapid yet accurate modeling of pinching of piping, which consumes a major portion of the creep life. The simulation is used to estimate the remaining life of the piping system, evaluate the adequacy of existing bellows and spring can supports and explore remediation options.

Static Finite Element Analysis on Cast Shell of a 100 kW Single Screw Expander

2014 ◽  
Vol 694 ◽  
pp. 279-282
Author(s):  
Qi Liu ◽  
Hang Guo ◽  
Wei Wang ◽  
Yu Ting Wu ◽  
Fang Ye ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thick Wall ◽  
Thin Wall ◽  
Element Analysis ◽  
Single Screw ◽  
Shell Design ◽  
Fundamental Research ◽  
Assembly Problem ◽  
Design Pressure

In the process of shell design of a 100kW single screw expander, the fundamental research on the screw chamber walls thickness is still lacking. Thin wall may cause deformation and the damage possibility of the inlet passage. Thick wall will increase the weight of the expander and led to assembly problem and transportation inconvenience. In this paper, static finite element analysis on cast shell of the 100 kW single screw expander was carried out. By calculating stress distribution and deformation of the expander shell under 1.5 times of the design pressure, the authors find the thickness of gate rotor chamber walls and inlet passage walls as 15 mm is acceptable, but the thickness of screw chamber walls should be at least 35 mm.

Finite Element Analysis of a Locked Bolt With an Initial Crack

2009 ◽  
Author(s):  
Jean Paul Kabche ◽  
Mauri´cio Rangel Pacheco ◽  
Ivan Thesi ◽  
Luiz Carlos Largura
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Operating Conditions ◽  
Material Behavior ◽  
Isotropic Hardening ◽  
Stress Concentrations ◽  
Engineering Structures ◽  
Element Analysis ◽  
Micro Cracks ◽  
Non Linear

Bolted connections are largely employed in various types of engineering structures to transfer loads from one member to another. In particular, the off-shore industry has made extensive use of these connections, predominantly at the sub-sea level. In spite of their advantages, bolted joints are critical regions and may become sources of structural weakness due to large stress concentrations. Under severe operating conditions, micro-cracks can develop in the bolt, creating regions of elevated stress which may significantly reduce the integrity of the connection and ultimately lead to failure. This paper presents the three-dimensional finite element analysis of a steel locked bolt assembly aimed to assess the effect of micro-cracks on the structural integrity of the assembly using the commercial finite element package ANSYS. Non-linear contact between the bolt and nut threads is considered, where frictional sliding between components is allowed. A bi-linear isotropic hardening model is used to account for non-linear material behavior. The assembly is loaded by applying a pre-load of fifty percent of the yield stress of the material, according to the API-6A Norm. Two geometric models are investigated: a healthy locked bolt assembly with no initial cracks; and a damaged model, where a circular crack is introduced at the root of the bolt threads. The effect of the crack size is studied by modeling the crack with three different radius sizes. The J-Integral fracture mechanics methodology was used to study the stress concentrations in the damaged model.

FINITE ELEMENT ANALYSIS OF MECHANICAL DAMAGE IN CHICORY (Cichorium intybus L.)

2001 ◽  
pp. 527-530 ◽  
Author(s):  
N. Gillis ◽  
B.E. Verlinden ◽  
P. Van Hecke ◽  
J. De Baerdemaeker ◽  
B.M. Nicolaï
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Damage ◽  
Cichorium Intybus ◽  
Element Analysis
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