152 research outputs found
Toughening mechanisms and damage propagation in Architected-Interfaces
We investigate fracture properties of architected interfaces and their
ability to maintain structural integrity and provide stable damage propagation
conditions beyond the failure load. We propose theoretical and numerical
frameworks to evaluate the fracture properties of architected interfaces
sandwiched between two (face) materials. The microscopic geometries of these
interfaces are chosen as 2D cells--pillar, tetrahedron, and hexagon--as well as
their 3D counterparts--namely, pillar array, octet truss, and Kelvin cell. Our
model, both numerical and analytical, exhibits a high level of accuracy in
predicting the compliance before failure and failure loads. Novel results are
obtained during the damage propagation regime, indicating fulfilment of the
so-called fail-safe design. Some of the cell geometries unfold during fracture,
thus increasing the failure load and ensuring stable and controlled damage
propagation conditions
On Micropolar Elastic Foundations
The modelling of heterogeneous and architected materials poses a significant
challenge, demanding advanced homogenisation techniques. However, the
complexity of this task can be considerably simplified through the application
of micropolar elasticity. Conversely, elastic foundation theory is widely
employed in fracture mechanics and the analysis of delamination propagation in
composite materials. This study aims to amalgamate these two frameworks,
enhancing the elastic foundation theory to accommodate materials exhibiting
micropolar behaviour. Specifically, we present a novel theory of elastic
foundation for micropolar materials, employing stress potentials formulation
and a unique normalisation approach. Closed-form solutions are derived for
stress and couple stress reactions inherent in such materials, along with the
associated restoring stiffness. The validity of the proposed theory is
established through verification using the double cantilever beam
configuration. Concluding our study, we elucidate the benefits and limitations
of the developed theory by quantifying the derived parameters for materials
known to exhibit micropolar behaviour. This integration of micropolar
elasticity into the elastic foundation theory not only enhances our
understanding of material responses but also provides a versatile framework for
the analysis of heterogeneous materials in various engineering applications
Plasmids of Psychrotolerant Polaromonas spp. Isolated From Arctic and Antarctic Glaciers – Diversity and Role in Adaptation to Polar Environments
Cold-active bacteria of the genus Polaromonas (class Betaproteobacteria) are important components of glacial microbiomes. In this study, extrachromosomal replicons of 26 psychrotolerant Polaromonas strains, isolated from Arctic and Antarctic glaciers, were identified, sequenced, and characterized. The plasmidome of these strains consists of 13 replicons, ranging in size from 3,378 to 101,077 bp. In silico sequence analyses identified the conserved backbones of these plasmids, composed of genes required for plasmid replication, stable maintenance, and conjugal transfer. Host range analysis revealed that all of the identified plasmids are narrow-host-range replicons, only able to replicate in bacteria of closely related genera (Polaromonas and Variovorax) of the Comamonadaceae family. Special attention was paid to the identification of plasmid auxiliary genetic information, which may contribute to the adaptation of bacteria to environmental conditions occurring in glaciers. Detailed analysis revealed the presence of genes encoding proteins potentially involved in (i) protection against reactive oxygen species, ultraviolet radiation, and low temperatures; (ii) transport and metabolism of organic compounds; (iii) transport of metal ions; and (iv) resistance to heavy metals. Some of the plasmids also carry genes required for the molecular assembly of iron–sulfur [Fe-S] clusters. Functional analysis of the predicted heavy metal resistance determinants demonstrated that their activity varies, depending on the host strain. This study provides the first molecular insight into the mobile DNA of Polaromonas spp. inhabiting polar glaciers. It has generated valuable data on the structure and properties of a pool of plasmids and highlighted their role in the biology of psychrotolerant Polaromonas strains and their adaptation to the environmental conditions of Arctic and Antarctic glaciers
Towards Activity Context using Software Sensors
Service-Oriented Computing delivers the promise of configuring and
reconfiguring software systems to address user's needs in a dynamic way.
Context-aware computing promises to capture the user's needs and hence the
requirements they have on systems. The marriage of both can deliver ad-hoc
software solutions relevant to the user in the most current fashion. However,
here it is a key to gather information on the users' activity (that is what
they are doing). Traditionally any context sensing was conducted with hardware
sensors. However, software can also play the same role and in some situations
will be more useful to sense the activity of the user. Furthermore they can
make use of the fact that Service-oriented systems exchange information through
standard protocols. In this paper we discuss our proposed approach to sense the
activity of the user making use of software
Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview
The development of new adhesives has allowed to expand the application of bonding into the most diverse industrial fields. This review article presents the commonly used experimental methods for the investigation of mechanical performance of adhesively bonded joints in the aerospace, wind energy, automotive and civil engineering sectors. In these sectors, due to their excellent intrinsic properties, composite materials are often used along with conventional materials such as steel, concrete and aluminium. In this context, and due to the limitations that the traditional joining techniques present, adhesive joints are an excellent alternative. However, standardized experimental procedures are not always applicable for testing representative adhesive joints in these industries. Lack of relevant regulations across the different fields is often overcome by the academia and companies’ own regulations and standards. Additional costs are thus mitigated to the industrial sectors in relation with the certification process which effectively can deprive even the biggest companies from promoting adhesive bonding. To ensure continuous growth of the adhesive bonding field the new international standards, focusing on actual adhesive joints’ performance rather than on specific application of adhesive joints are necessary.This work was supported by the European Cooperation in Science and Technology [CA 18120]
Structure of the Full-Length Major Pilin from Streptococcus pneumoniae: Implications for Isopeptide Bond Formation in Gram-Positive Bacterial Pili
The surface of the pneumococcal cell is adorned with virulence factors including pili. The major pilin RrgB, which forms the pilus shaft on pathogenic Streptococcus pneumoniae, comprises four immunoglobulin (Ig)-like domains, each with a common CnaB topology. The three C-terminal domains are each stabilized by internal Lys-Asn isopeptide bonds, formed autocatalytically with the aid of an essential Glu residue. The structure and orientation of the crucial N-terminal domain, which provides the covalent linkage to the next pilin subunit in the shaft, however, remain incompletely characterised. We report the crystal structure of full length RrgB, solved by X-ray crystallography at 2.8 Å resolution. The N-terminal (D1) domain makes few contacts with the rest of the RrgB structure, and has higher B-factors. This may explain why D1 is readily lost by proteolysis, as are the N-terminal domains of many major pilins. D1 is also found to have a triad of Lys, Asn and Glu residues in the same topological positions as in the other domains, yet mass spectrometry and the crystal structure show that no internal isopeptide bond is formed. We show that this is because β-strand G of D1, which carries the Asn residue, diverges from β-strand A, carrying the Lys residue, such that these residues are too far apart for bond formation. Strand G also carries the YPKN motif that provides the essential Lys residue for the sortase-mediated intermolecular linkages along the pilus shaft. Interaction with the sortase and formation of the intermolecular linkage could result in a change in the orientation of this strand, explaining why isopeptide bond formation in the N-terminal domains of some major pilins appears to take place only upon assembly of the pili
Insight into heavy metal resistome of soil psychrotolerant bacteria originating from King George Island (Antarctica)
The presence of heavy metals in Antarctica is an emerging issue, especially as (bio)weathering of metal-containing minerals occurs and human influence is more and more visible in this region. Chemical analysis of three soil samples collected from the remote regions of King George Island (Antarctica) revealed the presence of heavy metals (mainly copper, mercury, and zinc) at relatively high concentrations. Physiological characterization of over 200 heavy metal-resistant, psychrotolerant bacterial strains isolated from the Antarctic soil samples was performed. This enabled an insight into the heavy metal resistome of these cultivable bacteria and revealed the prevalence of co-resistance phenotypes. All bacteria identified in this study were screened for the presence of selected heavy metal-resistance genes, which resulted in identification of arsB (25), copA (3), czcA (33), and merA (26) genes in 62 strains. Comparative analysis of their nucleotide sequences provided an insight into the diversity of heavy metal-resistance genes in Antarctic bacteria
Mode II fracture energy in the adhesive bonding of dissimilar substrates: carbon fibre composite to aluminium joints
The end-notched flexure (ENF) test calculates the value of mode II fracture energy in adhesive
bonding between the substrates of same nature. Traditional methods of calculating
fracture energy in the ENF test are not suitable in cases where the thickness of the adhesive
is non-negligible compared with adherent thicknesses. To address this issue, a specific
methodology for calculating mode II fracture energy has been proposed in this paper. To
illustrate the applicability of the proposed method, the fracture energy was calculated by
the ENF test for adhesive bonds between aluminium and a composite material, which considered
two different types of adhesive (epoxy and polyurethane) and various surface treatments.
The proposed calculation model provides higher values of fracture energy than
those obtained from the simplified models that consider the adhesive thickness to be zero,
supporting the conclusion that the calculation of mode II fracture energy for adhesives with
non-negligible thickness relative to their adherents should be based on mathematical models,
such as the method proposed in this paper, that incorporate the influence of this thickness
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