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ROZPRAWY INŻYNIERSKIE - TRAITE d'INGENIERIE

A QUARTERLY JOURNAL

Abstracts of papers for

Previous issue vol. 59, 4 (2011)

vol. 60, no. 1 (2012)

Contents of issue 1, vol. 60

1. D.-T. Chung, I. Rhee, B.Y. Joo, D.H. Jin, O.K. Rim, K.J. Park: Development of a soft recovery system of supersonic projectiles
2. Ch. Xiaowei, L. Guanjun: Perforation modes of metal plates struck by a blunt rigid projectile
3. B. Haddag, S. Atlati, M. Nouari, C. Barlier, M. Zenasni: Analysis of the cutting parameters influence during machining aluminium alloy A2024-T351 with uncoated carbide inserts
4. J. Struski, K. Wach: Theoretical basis of determining the translation and rotation of steering wheel stub axle
5. G.C. Rana, S. Kumar: Effect of rotation and suspended particles on the stability of an incompressible Walters' (model B') fluid heated from below under a variable gravity field in a porous medium
6. T. Łodygowski, A. Rusinek, T. Jankowiak, W. Sumelka: Selected topics of high speed machining analysis

Dong-Teak Chung, Ihnseok RHEE, Byung Yun JOO, Doo Han JIN, One Kwon RIM, Kwan Jin PARK: Development of a Soft Recovery System of Supersonic Projectiles

An effective and robust soft recovery system for supersonic projectiles is required for the test of intelligent projectiles in development phase. The survivability of the projectiles after initial impact onto the target is the most important requirement of them. A soft recovery system, consisting of multiple equally spaced metal plates, was designed and fabricated. Numerical simulations were performed to estimate the deceleration of the projectile after piercing through a thin steel plate with various speeds. Next, the thickness distribution of the plate for uniform deceleration could be designed. An aluminum foil sensor system was used to measure the arrival time of the projectile onto each plate and multi-channel time recording system for this test was developed. Field tests were done using a rifled barrel gun and a smooth bore gun. Deceleration data were acquired successfully. The trajectories of the projectile after the impact tended to veer off from the initial firing line with an increasing yaw angle. Deceleration increased with the increase of the yaw angle. Field data were used to design a final recovery system to retrieve the projectile with a minimum deceleration and damage.

Key words: soft recovery, projectile, impact, simulation.

Contents

Chen XIAOWEI, Liang GUANJUN: Perforation Modes of Metal Plates Struck by a Blunt Rigid Projectile

The present paper analyzes the possible modes of shear plugging and adiabatic shear plugging in the perforation of metal plates struck by a blunt rigid projectile. The modified ballistic limit and residual velocity under the condition of adiabatic shear plugging are further formulated. Further experimental analyses are conducted on the perforations of Weldox E steel plates in order to discuss the effects of plate thickness and material strength/hardness on the terminal ballistic performance. More experimental evidence confirms the jump of residual velocity at the ballistic limit induced by the structural response of the plate. With increasing the thickness of plate and the material strength, failure modes of the plate may transform from shear plugging to adiabatic shear plugging.

Key words: blunt rigid projestile, metallic plate, perforation, shear plugging, adiabatic shear plugging.

Contents

Badis HADDAG, Samir ATLATI, Mohammed NOUARI, Claude BARLIER, Mohammed ZENASNI: Analysis of the Cutting Parameters Influence During Machining Aluminium Alloy A2024-T351 with Uncoated Carbide Inserts

This work aims to analyze the effect of the cutting parameters on chip segmentation of the aluminium alloy A2024-T351 during machining process. In this work, two parameters are considered: the tool rake angle of the cutting tool and the feed under dry machining. An orthogonal cutting FE model is developed in Abaqus/Explicit for this purpose. A thermo-visco-plastic-damage model for the machined material and thermo-rigid behaviour for the cutting tool have been assumed. At the chip/tool contact zone, the modified Coulomb friction model has been adopted. Thermal effects are considered by taking into account the heat flux generated by visco-plastic strain and also by friction at the tool-workpiece interface. The obtained results showed the effect of the tool rake angle and feed on the cutting force and chip morphology as well as temperature distribution at the tool rake face.

Key words: orthogonal cutting, tool rake angle, feed, FE analysis, cutting force, chio segmentation.

Contents

Józef STRUSKI, Krzysztof WACH: Theoretical Basis of Determining the Translation and Rotation of Steering Wheel Stub Axle

In the paper a theoretical basis of determination of the steering wheel stub axle position and orientation in the suspension movements space, realized by the suspension mechanism are presented. The designed instrument allows measurement of quantities that are needed to compute the translation and orientation of the stub axle and to draw the kinematic characteristics of the suspension.

Key words: passenger car, multi-link suspension, steering wheel translation and orientation.

Contents

G.C. RANA, Sanjeev KUMAR: Effect of Rotation and Suspended Particles on the Stability of an Incompressible Walters' (Model B') Fluid Heated from Below Under a Variable Gravity Field in a Porous Medium

The effect of rotation and suspended particles on the stability of an incompressible Walters' (model B') fluid heated from below under a variable gravity field in a porous medium is considered. By applying a normal mode analysis method, the dispersion relation has been derived and solved numerically. It is observed that the rotation, gravity field, suspended particles, and viscoelasticity introduce oscillatory modes. For stationary convection, the rotation has a stabilizing effect and suspended particles are found to have a destabilizing effect on the system, whereas the medium permeability has a stabilizing or destabilizing effect on the system under certain conditions. The effect of rotation, suspended particles, and medium permeability has also been shown graphically.

Key words: Walters' (model B') fluid, rotation, suspended particles, variable gravity field, pirous medium.

Tomasz ŁODYGOWSKI, Alexis RUSINEK, Timasz JANKOWIAK, Wojciech SUMELKA: Selected Topics Of High Speed Machining Analysis

Some aspects of numerical analysis of problems related to high strain rates with thermal effects are considered. The attention is focused on constitutive modelling that describes the accompanied phenomena like plastic strain localization and softening. The importance of proper formulation of failure criteria is stressed. Also the complexity of computations is discussed.

Key words: high speed machining, numerical simulation, plasticity and softening.

Full text of this issue is available in our webside.

Abstracts for 59, 4, 2011 (previous issue)