Piotr Bartkowski

Piotr Bartkowski
Warsaw University of Technology · Faculty of Automotive and Construction Machinery Engineering

About

10
Publications
956
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38
Citations
Introduction

Publications

Publications (10)
Article
Full-text available
This article describes the cyclic loading of jammed granular systems represented by vacuum-packed particles in compression and tension, focusing on the influence of the properties of the granular material on the mechanical response. A jammed granular system is represented by a cylindrical sample filled with polymer granules (vacuum-packed particles...
Article
Vacuum-packed particle (VPP) systems have been recently used in the development of smart structures due to their ability to actively change material stiffness through the mechanism of granular jamming. By altering the strength of the vacuum pressure applied to the particles, the material can be proportionally and reversibly transitioned from a liqu...
Article
Full-text available
Jammed granular systems, also known as vacuum packed particles (VPP), have begun to compete with the well commercialized group of smart structures already widely applied in various fields of industry, mainly in civil and mechanical engineering. However, the engineering applications of VPP are far ahead of the mathematical description of the complex...
Article
Recently, post‐SPD shaping processes have attracted attention because of the limited amount of data available on this topic. In this paper, the formability of commercially pure aluminum plates with an ultrafine‐grained microstructure processed by Incremental ECAP (I‐ECAP) up to 8 passes is discussed. The formability is evaluated experimentally usin...
Article
This paper investigates cylindrical samples made of vacuum packed particles. Such structures are composed of granular media placed in a hermetic encapsulation where, in the final stage, a partial vacuum is generated. The main advantage of such a structure is that the underpressure value makes it possible to control the global physical properties of...
Article
Full-text available
In this work the experimental test of Vacuum Packed Particles (VPP) under 3-point bending are presented. VPP it is the structure compose of grains inside the plastomer coating. When the pressure inside is equal or higher than zero structure behave like a liquid, otherwise like a elasto-plastic solid. Three types of grain material and different valu...
Article
Full-text available
In the paper a proposal of granular damper prototype has been introduced. The granular damper works on the basis of a core made of Vacuum Packed Particles. Idea of Vacuum Packed Particles consists of placing loose granular grains into a hermetic envelope, wherein in the next stage a partial vacuum is generated. The difference between an atmospheric...
Article
Full-text available
In this paper a new air-bag prototype suitable for protecting valuable objects mounted on the drone is presented. The paper provides a complimentary study involving both numerical simulations and experimental study. The experimental research results are presented for typical air-bag's textile material and were used as a base for the material model...
Article
Full-text available
The conceptual design of smart crash energy absorber made of Vacuum Packed Particles (VPP) is presented in this work. This structure is composed of granular material inside a plastomer sleeve. The absorber can change the flexural stiffness and as a result the amount of dissipated energy depending on the impact conditions. The special properties of...
Chapter
In this paper the authors would like to introduce a new air-bag’s prototype suitable for protecting valuable objects mounted on the drones. The experimental research results are presented for typical air-bag’s textile material. Laboratory tests were a base for the material’s model calibration process. The numerical simulations for proposed air-bag’...

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