Damage Mechanics
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Recent papers in Damage Mechanics
The earthquake of the 9th of July 1998 that hit in the central group of the Azores archipelago greatly affected the islands of Faial, Pico and São Jorge, reaching a magnitude of Mw 6.2 with the epicentre located about 15km northeast of... more
In order to design structural components using composite materials a deep understanding of the material behaviour and its failure mechanisms is necessary. To create a better understanding of the initiation, growth and interaction of the... more
Buckling structures that cannot be simply understood in the frame of continuum elastic theory have been observed by atomic force microscopy on gold films, 630 nm thick, deposited by sputtering method on silicon substrates. X-ray... more
An improved gradient-enhanced approach for softening elasto-plasticity is proposed, which in essence is fully nonlocal, i.e. an equivalent integral nonlocal format exists. The method utilises a nonlocal field variable in its constitutive... more
The effects of nanoclay inclusion on cyclic fatigue behavior and residual properties of carbon fiber-reinforced composites (CFRPs) after fatigue have been studied. The tension-tension cyclic fatigue tests are conducted at various load... more
Geometrical models needed for finite element discretization of plain-weave fabric-reinforced composites are developed from measurements taken on photomicrographs of single lamina and laminated composites. Then, a meso-level damage model... more
The use of self-organizing maps and artificial neural networks for structural health monitoring is presented in this paper. The authors recently developed a nonparametric structural damage detection algorithm for extracting damage indices... more
This article addresses several issues in damage micromechanics for microcracked brittle or quasi-brittle solids, with major attention paid on summarizing some recent works of the present authors. First, we discuss the methods for... more
This study deals with the creep damaging processes of two polyethylene (PE) resins. One is a ductile material while the other is a brittle one. Scanning electron microscopic (SEM) observations as well as chemical analysis are used to... more
A 1.91-mm thick circular polycarbonate plate of 115 mm diameter was impacted by a spherical steel projectile of 6.98 mm diameter at its center. Subsequent impacts were made at 10, 20, 30, 40, and 50 mm radii of the plate. Dent dimensions... more
In the next generation nanoelectronics and SiC based electronic packaging, current density and temperature gradient will be larger in orders of magnitude. Electromigration and thermomigration are considered to be major road blocks leading... more
Aim of the paper is the study of the cyclic behavior of reinforced concrete beams taking into account the compression and tensile softening in the concrete material, the Baushinger effect in the steel and an adequate bond-slip law for the... more
Для более точной оценки прочности эксплуатируемых железобетонных конструкций необходимо использовать модели с дискретным расположением арматурных стержней с учетом реальных характеристик сцепления арматуры с бетоном, определяемых, как... more
This paper provides a historical review of the literature on the effects of radiation-induced displacement damage in semiconductor materials and devices. Emphasis is placed on effects in technologically important bulk silicon and silicon... more
excellent ideas, advice and support were invaluable for the completion of this work and I render thanks to them. I would like to express my gratitude to Carlos Dávila for his continuous interest in the work and his valuable comments and... more
This book is written for people who wish to learn MATLAB for the first time. The book is really designed for beginners and students. In addition, the book is suitable for students and researchers in various disciplines ranging from... more
Structural health monitoring (SHM) and vibration-based structural damage detection have been a continuous interest for civil, mechanical and aerospace engineers over the decades. Early and meticulous damage detection has always been one... more
It is very significant to investigate the shot peening mechanism in ensuring a good resistance to fatigue and stress corrosion. This paper reviews the recent advancements in shot peening process. Emphasis is put on the application of... more
To achieve safety and reliability in pipelines installed in seismic and permafrost regions, it is necessary to use linepipe materials with high strength and ductility. The introduction of dual-phase steels, e.g., with a bainite and... more
This review addresses possible adaptation strategies in rice production to abiotic stresses that will aggravate under climate change: heat (high temperature and humidity), drought, salinity, and submergence. Each stress is discussed... more
excellent ideas, advice and support were invaluable for the completion of this work and I render thanks to them. I would like to express my gratitude to Carlos Dávila for his continuous interest in the work and his valuable comments and... more
Reformer furnaces are used in petrochemical industry to produce hydrogen. Their most critical components are radiant tubes, where extreme temperature and pressure conditions required the deployment of high alloyed austenitic HP grade... more
In this paper the representation of geological conditions in a numerical simulation model is considered. By the expression ''geological conditions'' we mean the 3D volume geometry of the geological formations, the spatial variability... more
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with... more
This study focuses on the description of damage and failure behaviour of triaxial braided carbon/epoxy composites under tension. The tensile tests were instrumented with optical surface strain and acoustic emission measurements. Damage... more
This paper presents a 3-D failure model for predicting the dynamic material response of composite laminates under impact loading. The formulation is based on the Continuum Damage Mechanics (CDM) approach and enables the control of the... more
We present a compendium of optocoupler radiation test data including data on neutron, proton and heavy ion displacement damage (DD), single event transients (SET) and degradation due to total ionizing dose (TID). Proton data includes... more
At the present time, life acceleration factors for solder joints made of SnAgCu (SAC) ternary alloys between accelerated tests and field use conditions are not well understood. Further, the cycle time for accelerated testing of Pb-free... more
The origins of the enhanced ac hot-carrier stress damage are examined in this paper. The enhancement in hotcarrier stress damage under ac stress conditions observed with respect to damage under dc stress conditions can fully be explained... more
In this work a novel methodology for fracture toughness characterization by means of the small punch test (SPT) is presented. Notched specimens are employed and fracture resistance is assessed through a critical value of the notch mouth... more
International Fracture Mechanics Summer Schools have been held from 1980 and have attracted a large number of well-known specialists and participants. Monographs published after every school have been the most effective references in... more
Rail corrugation wear is one of the most important types of track wear in the railroad industry. The most common cases of rail corrugation that have been documented in the literature were classified by Grassie [1] in six categories,... more
Neurodegenerative diseases constitute a worldwide health problem. Metals like iron and copper are essential for life, but they are also involved in several neurodegenerative mechanisms such as protein aggregation, free radical generation... more
The wear resistance at high temperature of different high speed steels (HSS) for rolls is evaluated on the basis of a tribological test aimed at reproducing the damage mechanisms occur during hot rolling. The test is positively used to... more
Compression-after impact (CAI) strength Room and high temperatures CAI damage mechanisms CAI test and Impact energy a b s t r a c t
In this paper, a continuum viscoplastic model including damage effects is used to describe the creep deformation and damage mechanisms of P92 steel in the temperature range 550-750 C. In a first step, the results of creep tests performed... more
Form change due to wear and plastic deformation on a rail can reduce the service life of a track. The purpose of this investigation was to study the development of these damage mechanisms on new and 3-year-old rails in a commuter track... more