Search results for "Forensic engineering"
showing 10 items of 116 documents
Thermo‐Hydro‐Mechanical Model and Caprock Deformation Explain the Onset of an Ongoing Seismo‐Volcanic Unrest
2021
Acknowledgments The authors are grateful to the Editor, Prof. Ben‐Zion Yehuda, and the reviewers: Prof. Micol Todesco and an anonymous reviewer, whose comments and recommendations have significantly improved the quality of this work. The authors acknowledge the financial support of the Petroleum Technology Development Fund (PTDF) Nigeria for this research. The comparison of our models with monitoring data was made possible by the outstanding efforts of the staff at the INGV‐Osservatorio Vesuviano, who provide weekly information about geophysical parameters at the Campanian volcanoes (http://www.ov.ingv.it/ov/en/bollettini/272-campi-flegrei-bollettini-settimanali.html). The authors are parti…
Measurement of residual stresses by the hole-drilling method: Influence of hole eccentricity
1979
The hole-drilling method is a semidestructive technique which allows the measurement of residual stresses. In this method, a source of error is due to the misalignment between the hole and rosette centres. This paper presents a theoretical analysis of the influence of such misalignment on the strains measured by the rosette. Formulae which give the residual stresses taking account of the hole eccentricity are derived. Finally, the errors, which affect the residual stresses when the eccentricity is neglected, are evaluated for some commercial strain-gauge rosettes especially developed for the hole-drilling method.
Flying laser spot thermography for the inspection of aerospace grade Fibre Metal Laminates
2017
This work analyses a Non Destructive Testing approach for the detection of interlayer disbonds in aerospace grade Fibre Metal Laminates (FMLs). The NDT setup consists of a continuous laser, focused and moved over the material surface, while an IR thermal camera acquires its thermal footprint. A numerical model of the NDT setup is presented, where the material thermal response is analysed to evaluate the features of the defects signatures. In particular, the response from various types of FMLs is evaluated.
Maximum Water Temperature Limit in Open-Water Swimming Events
2014
Removal of failed crown and bridge
2011
Crown and bridge have life span of many years but they fail for a number of reasons. Over the years, many devices have been designed to remove crowns and bridges from abutment teeth. While the removal of temporary crowns and bridges is usually very straightforward, the removal of a definitive cast crown with unknown cement is more challenging. Removal is often by destructive means. There are a number of circumstances, however, in which conservative disassembly would aid the practitioner in completing restorative/endodontic procedures. There are different mechanisms available to remove a failed crown or bridge. But there is no information published about the classification of available syste…
Analysis of a Collapsed Long-Span Reinforced Concrete Roof in South Italy: Design Mistakes and Material Degradation
2020
In 2004, during ordinary maintenance work, consisting of waterproofing a building located in the south of Italy, the long-span (14.5 m) in situ RC roof partially collapsed. The building, constructed in 1950, was in service as a cinema until 1967 and then utilized as a school until 1985. Lastly, it was a hotel until 2000. In 2004, when the building was not in service and was undergoing maintenance work, it partially collapsed under dead load. After the collapse, which involved a large portion of the roof, several beams, and two columns, the Italian court nominated an official technical consultant to investigate the direct and related causes of the failure. After the main causes were identifi…
Structural Analysis, Retrofitting Design, and In Situ Control of Permanently Damaged Long-Span Timber Beams of a Historical Building in the South of …
2020
AbstractIn 2018, under service conditions, excessive deflections were observed in the long-span timber beams of the first floor of the former Saint Elisabeth Monastery in Palermo (Italy). The build...
Metal pins fired from unmodified blank cartridge guns and very small calibre weapons - technical and wound ballistic aspects
1998
Blank cartridge guns are generally regarded as being harmless and are not considered to be firearms in most countries. A comparison of the legal situations in Germany and Austria concerning weapons is given. There have been several reports of serious injuries and even fatalities due to these weapons. Ballistic experiments show that even unmodified blank cartridge guns and very small calibre weapons can fire wire nails and can inflict potentially fatal injuries even at distances of 50 cm. Two serious injuries inflicted by metal pins fired from a blank cartridge gun and a very small calibre weapon are reported. These cases suggest that such weapons should also be considered handguns in the le…
Expert witness in paternity testing in Germany.
2003
In Germany, paternity testing can be ordered by a judge as well as by private persons. In the case of private counselling, the expert has the duty to inform the parties on all medical, legal and ethical aspects. Informed consent must be given by each individual included in an exploration of family relationships. Due to the rapid progress of DNA typing in even minute amounts after polymerase chain reaction amplification, genotypes of short tandem repeat systems can be elicited by extraction from single cells. Therefore, the number of unlawful investigations of paternal relationships is steadily increasing. Here the requirements for paternity testing laboratories and sanctions for unlawful ex…
Positron Microscopy Studies of Wear Tracks on a Copper Surface
2014
Positron microscopy was used for studies of defects induced by ball indentation or sliding on the surface of well-annealed copper samples. A focused positron beam of 24.5-keV energy was used to scan the deformed region of the indenter impression, and measurements of the annihilation line parameter were performed. In the case of ball indentation, the measured defect distribution correlates well with the von Mises stress distribution of the Hertz contact and the von Mises yield criterion. For the wear track produced by pin on disc dry sliding, an asymmetric defect distribution near the wear track is observed. It indicates the presence of a tangential force that additionally deforms the sample.