In this paper, we consider an  i.e., multiple step-stress accelerated life testing (ALT) experiment with unequal duration of time . It is assumed that the time to failure of a product follows Rayleigh distribution with a log-linear relationship between stress and lifetime and also we assume a generalized Khamis-Higgins model for the effect of changing stress levels. Taking into account that the...

INTRODUCTION The proposition of specifying, designing, or constructing a new system or one or more of its sub-elements (e.g., production articles, assemblies, components, or constituent materials) is one that is common and familiar to most engineers. Admittedly, no one engineer is involved in all aspects of bringing a new system from product definition through deployment, but rather, each is mo...

colour is one of the most important quality factors that can influence and determine the shelf life of canned chicken kebab. colour change is considered as unsuitable distasteful to consumers, indicating the end of a product's shelf life. in this study quality aspects of samples were examined over one month intervals after being prepared and while being stored under accelerated (44 °c) con...

Abstract: To ensure the rail transportations safety, evaluation of fatigue behavior of the rail steel is necessary. High cycle fatigue behaviour of a rail steel was the subject of investigation in this research using fracture mechanics. Finite element method (FEM) was used for analyzing the distribution of the stresses on the rail, exerted by the external load. FEM analysis showed that the ...

Very low failure rates, down to 10 FIT are now currently expected by electronic system manufacturers. In the same time, severe conditions of utilisation are common in most of industrial and commercial applications, like automotive sector for example. In order to assess this reliability “challenge”, process control, design and technological solutions have to be optimised to guarantee almost no d...