Aleksander Marek

Aleksander Marek
University of Southampton

Doctor of Philosophy

About

17
Publications
2,793
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225
Citations
Introduction
I am a Research Fellow at the University of Southampton working on measuring mechanical deformation of cells/biological tissues under ultrasonic loading (UltraSurge - https://www.gla.ac.uk/research/az/ultrasurge/). My interests are mainly in the fields of experimental mechanics and modelling behaviour of material parameters and combining the two in an innovative way.

Publications

Publications (17)
Research Proposal
Full-text available
This Special Issue of Materials is devoted to experimental research and computational analysis of eco- and biomaterials. Biomaterials belong to the family of materials of biological origin, which includes, inter alia, wood-based materials, corrugated cardboard, but also synthetic and natural materials that may come into direct contact with organic...
Article
Full-text available
The standard edge crush test (ECT) allows the determination of the crushing strength of the corrugated cardboard. Unfortunately, this test cannot be used to estimate the compressive stiffness , which is an equally important parameter. This is because any attempt to determine this parameter using current lab equipment quickly ends in a fiasco. The b...
Preprint
The standard edge crush test (ECT) allows to determine the crushing strength of the corrugated cardboard. Unfortunately, this test cannot be used to estimate the compressive stiffness, which is an equally important parameter. It is because, any attempt to determine this parameter using current lab equipment quickly ends in a fiasco. The biggest obs...
Article
Full-text available
This article focuses on the derivation of simplified predictive models for the identification of the overall compressive stiffness and strength of corrugated cardboards. As a representative example an unsymmetrical 5-ply sample (with E and B flute) was used in this study. In order to exclude unreliable displacement measurement in the standard edge...
Preprint
Full-text available
The article focuses on derivation of simplified predictive models for identification of overall compressive stiffness and strength of corrugated cardboards. As a representative example an unsymmetrical 5-ply sample (with E and B flute) was used in this study. In order to exclude unreliable displacement measurement in the standard edge crush test, t...
Chapter
We present a new method for controllable loading of cell models in an ultrasonic (20 kHz) regime. The protocol is based on the inertial-based ultrasonic shaking test and allows to deform cells in the range of few mm/m to help understand potential consequences of repeated loading characteristic of ultrasonic cutting.
Article
Full-text available
Current high strain rate testing techniques typically rely on the split-Hopkinson bar (SHB). The early response in an SHB test is corrupted by inertia making it difficult to accurately characterise the transition from elasticity to plasticity for metals. Therefore, a new test method is required. This article is the second in a two part series which a...
Article
Full-text available
Current high strain rate testing procedures generally rely on the split Hopkinson bar (SHB). In order to gain accurate material data with this technique, it is necessary to assume the test sample is in a state of quasi‐static equilibrium so that inertial effects can be neglected. During the early portion of an SHB test, it is difficult to satisfy t...
Article
Full-text available
In this work, the sensitivity-based virtual fields have been applied to identify two anisotropic plasticity models (Hill48, Yld2000-2D) using a deep-notched tensile test performed on flat samples of cold-rolled sheet of DC04 steel. The material was characterised using the standard protocol to obtain the reference sets of parameters. Deformation dat...
Article
The Virtual Fields Method (VFM) is a well established inverse technique used to identify the constitutive parameters of material models using heterogeneous full-field strain data. When VFM is employed to retrieve the coefficients of advanced plasticity models, including non linear hardening and anisotropy, however, the procedure may become computat...
Article
Full-text available
The virtual fields method is an approach to inversely identify material parameters using full-field deformation data. In this work, we extend the sensitivity-based virtual fields to large deformation anisotropic plasticity. The method is firstly generalized to the finite deformation framework and then tested on numerical data obtained from a finite...
Thesis
Extraction of material parameters from full-field measurements is an increasingly important part of experimental mechanics. Due to development of full-field techniques, such as digital image correlation, new types of mechanical tests are being developed that lead to a more efficient investigation of materials behaviour. One of the popular technique...
Conference Paper
Full-text available
In this work, a characterisation method involving a deep-notched specimen subjected to a tensile loading is introduced. This specimen leads to heterogeneous states of stress and strain, the latter being measured using a stereo DIC system (MatchID). This heterogeneity enables the identification of multiple material parameters in a single test. In or...
Article
Full-text available
The virtual fields method (VFM) is an approach to inversely identify material parameters using full-field deformation data. In this manuscript, a new set of automatically-defined virtual fields for non- linear constitutive models has been proposed. These new sensitivity-based virtual fields reduce the influence of noise on the parameter identificat...
Article
Full-text available
The numerical modeling of plates with periodic corrugation requires some efforts to be made in terms of careful and precise discretization of the complicated structure. This automatically generates very computationally expensive models. One of the most popular methods of model simplification is analytical or numerical homogenization. The main goal...
Conference Paper
Full-text available
Homogenization of corrugated cardboards plays an important role in computer aided design of cardboard packages. The numerical analysis performed on a full structural model gives very precise results however is computational costly and therefore impractical in industrial applications. Thanks to adopted model simplifications an engineer responsible f...
Conference Paper
Full-text available
Paperboard products are widely used for many years by various industries, ranging from a paper-based aseptic liquid packages to book covers. In many of its applications it has to be folded in order to form a particular shape of a package or a book. A single and a multiply pa-perboard can and should be creased before folding. Ideally, the paperboard...

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Projects

Projects (2)
Project
Ultrasurge is a project looking into utilising ultrasound in surgery. Supported by a programme grant from EPSRC for over £6m in funding, Ultrasurge will last 5 years and look into a series of interelated themes around the effect of ultrasound on tissue, the miniaturisation of ultrasound transducers, and using external robots to direct ultrasound tipped robot tentacles to the surgery site within the body. The programme is led by Prof Margaret Lucas at the University of Glasgow with teams based at the Universities of Birmingham, Edinburgh, Leeds and Southampton.
Project
The objective of the present project is to lay the foundations of a new era in dynamic testing of materials based on the availability of digital imaging technology to provide full-field deformation measurements at very high speeds. One can then use this information in conjunction with efficient numerical inverse identification tools such as the Virtual Fields Method to design novel test procedures to identify material parameters at high rates. The underpinning novelty is to exploit the inertial effects developed in high strain rate load. These have hitherto been regarded as undesirable in conventional testing. However, in the identification process they can play the role of a volume distributed load cell for which readings are embedded in the full-field deformation measurements. The idea is ground breaking as it has the potential to lift the current major limitations of high strain rate test, i.e. small specimen and constant velocity. The present proposal aims at providing a platform to develop this methodology for many different types of situations in terms of materials, loading configuration and strain rate range. The project has the potential to revolutionize high strain rate testing of materials and hence enhance our knowledge of material behaviour. This will in turn benefit many sectors of engineering and society in the long term.