A Novel Scheme for Computing Gun Barrel Temperature History and Its Experimental Validation

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Avanish Mishra ◽  
Amer Hameed ◽  
Bryan Lawton
Keyword(s):  
Finite Element ◽  
Temperature Variation ◽  
Experimental Validation ◽  
Temperature History ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Gun Barrel ◽  
Internal Ballistics ◽  
Lumped Parameter ◽  
Over Time

An accurate modeling of gun barrel temperature variation over time is important to assess wear and the number of shot fires needed to reach cook-off. Using lumped parameter methods, an internal ballistics code was developed to compute heat transfer to the gun barrel for given ammunition parameters. Subsequently the finite element method was employed to model gun barrel temperature history (temperature variation over time). Simulations were performed for a burst of nine shots and the results were found to match satisfactorily to the corresponding experimental measurements. Wear or erosion of the barrel during a gun fire is very sensitive toward the maximum bore surface temperature. The proposed scheme can accurately simulate gun barrel temperature history; hence improved wear calculations can be made with it. An important and unique advantage of the developed scheme is that it easily couples internal ballistics simulations with the finite element methods.

A Model for the Prediction of Form Errors in Face Milling and Turning

1999 ◽  
Author(s):  
Luc Masset ◽  
Jean-François Debongnie ◽  
Sylvie Foreau ◽  
Thierry Dumont
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cutting Forces ◽  
Experimental Validation ◽  
Industrial Applications ◽  
Face Milling ◽  
The Finite Element Method ◽  
Form Errors ◽  
Error Computation ◽  
Element Method

Abstract A method is proposed for predicting form errors due to both clamping and cutting forces in face milling and turning. It allows complex tool trajectories and workpiece geometries. Error computation is performed by the finite element method. An experimental validation of the model for face milling is presented. Two industrial applications are produced in order to demonstrate the capabilities of the method.

Seepage and Heat Flow in Soil Freezing

1982 ◽  
Vol 104 (2) ◽  
pp. 323-328 ◽  
Author(s):  
P. E. Frivik ◽  
G. Comini
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seepage Flow ◽  
Soil Freezing ◽  
Temperature Fields ◽  
Laboratory Model ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Freezing And Thawing ◽  
Velocity And Temperature Fields

In this paper we describe a system of computer programs based on the finite element method, which can be used for the calculation of coupled velocity and temperature fields during freezing and thawing of soils in the presence of seepage flow. In the programs, the mass and energy conservation equations are solved simultaneously, without the use of too limiting assumptions. The results of the computations are compared with experimental measurements made on a laboratory model of a soil freezing system, and the agreement between measured and computed values is good.

Non-linear thermal analysis of light concrete hollow brick walls by the finite element method and experimental validation

2006 ◽  
Vol 26 (8-9) ◽  
pp. 777-786 ◽  
Author(s):  
J.J. del Coz Díaz ◽  
P.J. García Nieto ◽  
A. Martín Rodríguez ◽  
A. Lozano Martínez-Luengas ◽  
C. Betegón Biempica
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Finite Element ◽  
Experimental Validation ◽  
The Finite Element Method ◽  
Non Linear ◽  
Hollow Brick ◽  
Element Method

Steady-state multiphysics analysis of stator bar using finite element method

2020 ◽  
pp. 1-14
Author(s):  
José William Ribeiro Borges ◽  
Wellington da Silva Fonseca ◽  
Fernando de Souza Brasil ◽  
Ramon C.F. Araújo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
Thermal Effects ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Insulation System ◽  
State Behavior ◽  
Steady State Behavior ◽  
Element Method

The electrical insulation is one of the main sources of failures in hydro-generators, therefore it is important to research the insulation system of stator bars. In this paper, it is developed a steady-state multiphysics analysis of a stator bar using the Finite Element Method to assess its steady-state behavior in the electrical, magnetic and thermal domains. Different aspects are analyzed in simulations, such as capacitance, mechanical stress and thermal effects. Numerical results are compared with experimental measurements for validation.

scholarly journals Internal ballistics of polygonal and grooved barrels: A comparative study

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110169
Author(s):  
Usiel S Silva-Rivera ◽  
Luis Adrian Zúñiga-Avilés ◽  
Adriana H Vilchis-González ◽  
Pedro A Tamayo-Meza ◽  
Wilbert David Wong-Angel
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Comparative Study ◽  
Experimental Tests ◽  
Loading Conditions ◽  
The Finite Element Method ◽  
Maximum Deformation ◽  
Internal Ballistics ◽  
Internal Deformation ◽  
Element Method

As a parameter important ballistic, the research about polygonal and grooved barrels’ behavior has not been widely carried out. The pressures, velocities, stresses, deformations, and strains generated by the firing of 9 mm × 19 mm ammunition in weapons with polygonal barrels are analyzed numerically and experimentally, compared with those generated in pistols with grooved barrels. The Finite Element Method with equal boundary and loading conditions was used in both types of guns, specifying the actual materials of the projectile and the barrels. Subsequently, experimental tests were carried out on various weapons with 9 mm ammunitions of 115, 122, and 124 gr. The results show that the 9 mm bullet fired in a polygonal barrel undergoes a maximum deformation towards its exterior of 0.178 mm and interior of 0.158 mm, with stress up to 295.85 MPa. Compared with 0.025 mm maximum external deformation and 0.112 mm internal deformation of 9 mm projectiles fired in a grooved barrel, with stress up to 269.79 MPa. The deformation in the polygonal barrel is in a greater area, but the rifling impression left is less deep, making its identification more difficult. Although there are differences in the stresses and strains obtained, similar velocity and pressure parameters are achieved in the two types of barrels. This has application in the development and standardization of new kinds of barrels and weapons.

scholarly journals Study of Metallic Housing of the Adder Gearbox to Reduce the Noise and to Improve the Design Solution

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 912
Author(s):  
Nicoleta Gillich ◽  
Nicolae Sîrbu ◽  
Sorin Vlase ◽  
Marin Marin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Design Solution ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Lower Weight ◽  
Metal Construction ◽  
Element Method

In the manufacture of commercial trucks, used in oil installations or the army, two identical engines are used on a single chassis, whose power is summed by a gearbox, a compact metal construction, which must meet multiple operating requirements. The paper studies the behavior of such an adding box, currently used in manufacturing, and an improved, welded solution that produces less noise and has a lower weight. The finite element method is used for modeling the gearbox in order to analyze stresses and strains and obtain a modal analysis of the system. The results obtained from the calculation are then verified by experimental measurements. The two versions are analyzed in parallel to highlight the advantages of the second version.

A Finite Element Analysis of Friction Damping in a Slip Joint

1999 ◽  
Author(s):  
Weijiang Chen ◽  
Xiaomin Deng
Keyword(s):  
Finite Element ◽  
Dynamic Behavior ◽  
Dry Friction ◽  
Numerical Test ◽  
Structural Models ◽  
Bolted Joints ◽  
Joint Interface ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Lumped Parameter

Abstract Micro-slip along frictional interfaces often provides the dominant damping mechanism in a built-up structure and plays an important role in the dynamic behavior of the structure. This paper presents the results of a finite element study of the effect of dry friction on the damping response of a slip joint. The emphasis of this paper is to understand the evolution of the slip and stick regions along the joint interface during loading and to quantify the amount of energy dissipation during cyclic loading and its dependence on structural and loading parameters. Finite element predictions have been compared to experimental measurements and early analytical predictions in the literature. This study seems to demonstrate the potential of the finite element method in providing adequate “numerical” test data for formulating lumped-parameter structural models that can simulate the nonlinear dynamic behavior of bolted joints.

Experimental validation of a predictive model for numerical simulation of thermo-metallurgical phenomena during electron beam welding

2004 ◽  
Vol 120 ◽  
pp. 599-606
Author(s):  
M. Carin ◽  
Ph. Rogeon ◽  
D. Carron ◽  
Ph. Lemasson ◽  
D. Couedel ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Electron Beam ◽  
Heat Affected Zone ◽  
Experimental Validation ◽  
Electron Beam Welding ◽  
Welding Process ◽  
Experimental Measurements ◽  
Finite Element Code ◽  
Thermal Cycles

In the present work, thermal cycles measured with thermocouples embedded in specimens are employed to validate a numerical thermometallurgical model of an Electron Beam welding process. The implemented instrumentation techniques aim at reducing the perturbations induced by the sensors in place. A comparison between simulations performed on finite element code SYSWELD and the experimental measurements carried out on 16MnNiMo5 steel in the case of a partial penetration is achieved. This comparison is based on thermal cycles and also on microstructural evolutions, shapes of fusion zone (FZ) and heat affected zone (HAZ).

Sign in / Sign up

Export Citation Format

Share Document