Notched tensile bars of a high strength structural steel were loaded to void coalescense. The resuIts show that the damage curve determined using radially loaded specimens is not valid for specimens under nonradial loading. The results of the experiments with different load histories of notched tensile bars show, that a single parameter criterion like a damage parameter is not sufficient to des...

The behavior of plain woven fabric composites is studied using three-dimensional finite elements which allows detailed modeling of the geometric complexities and spatial material variations within the fabric. Damages in the composite constituents viz. yarn and pure matrix are modeled on a continuum basis and related to their material constitutive behavior. The 3D constitutive laws describing pu...

Ultrasonic fatigue tests (UFT) are used to study the life behavior of metallic components undergoing a very high number cycles (typically ≥107−109 cycles) under relatively low mechanical loads. By soliciting specimens at 20 kHz, ultrasonic machines indispensable for monitoring damage growth and failures in reasonable amount time. As accumulates specimen, specimen’s free-end exhibits nonlinear d...

The installation of long-term structural health monitoring (SHM) system on super-tall buildings, long span bridges and large space structures has become a worldwide trend since last decade to monitor loading conditions, to detect damage, to assess structural safety and to guide maintenance during their service life. The core part of an SHM system is the function of data processing and structura...

This paper presents a method for uncertainty analysis of prognostics with a focus on electronics subject to random vibration. First we identify uncertainty sources and types: measurement uncertainty, parameter uncertainty, failure criteria uncertainty, and future usage uncertainty. Next, we present an approach to determine the uncertainty in a prognostic analysis. Our approach utilizes a sensit...

While silicon has several properties making it an attractive material for structure-based laser-driven acceleration, its optical damage threshold, a key parameter for high-gradient acceleration, has been unknown. Here we present measurements of the optical damage threshold of crystalline silicon for ultrafast pulses in the mid-infrared. The wavelengths tested span a range from the telecommunica...

sustainability of water supply networks should be based on the risks of water hammer phenomenon. the purpose of this study is to provide a new approach to the analysis of water hammer phenomenon in the water supply network. by conventional methods, the damage because of water hammer is estimated based on the maximum pressure at nodes. however, during this phenomenon continuation and changing of...

A 3D finite element (FE) analysis technique using ABAQUS is chosen to explore the dynamic behavior of a beam under impact load. A beam, for which the impact dynamic test was conducted by Kishi (2004), is selected to develop a solid element FE model. FE analyses were performed implementing ABAQUS Explicit (2004) programming tool to predict the dynamic responses under the pressure amplitude intro...

The hepatoprotective activity of juice of Saccharum officinarum was investigated against paracetamol (acetaminophen) induced liver damage in rats. Paracetamol (PCM) is analgesic, antipyretics drugs available as an over the counter (OTC) medication which cause hepatotoxicity as higher doses. Paracetamol at 3gm/kg induced liver damage in rats manifested by statically increased serum alanine amino...

This paper concerns fatigue studies of polypropylene/glass-®bre thermoplastic composites produced from a bi-directional woven cloth of co-mingled E-glass ®bres and polypropylene ®bres with a ®bre volume fraction Vf of 0.338. The e€ect of lay-up design and load conditions on fatigue performance were investigated. The S-N curves, the rise in the temperature of the specimens, and the loss of sti€n...