Maintenance can represent a significant portion of the cost in asset intensive organisations, as breakdowns have an impact on capacity, quality and operation. However, formulation maintenance strategy depends number factors, including down time, reliability characteristics redundancy assets. Consequently, balance between preventive (PM) corrective (CM) for minimising costs varies organisations Nevertheless, there are some rules thumb PM CM, such 80/20 rule. Studies relationship CM practice...

Railway traffic has increased over the last decade and it is believed to increase further with movement of transportation from road rail, due increasing energy costs demand reduce emissions. As a result need railway capacity, more efficient effective operation maintenance required. To manage assets effectively within business objectives, results activities must be measured monitored. Performance indicators are developed support infrastructure managers in decision making, but they often ad...

Peridynamics is a nonlocal formulation of solid mechanics capable unguided modelling crack initiation, propagation and fracture. based upon integral equations, thereby avoiding spatial derivatives, which are not defined at discontinuities, such as surfaces. Rice's J-contour firmly established expression in classic continuum mechanics, used fracture characterizing parameter for both linear nonlinear elastic materials. A corresponding J-integral has previously been derived peridynamic...

Purpose Value driven maintenance (VDM) is a fairly new management methodology based on four value drivers and the formula of net present (NPV) to calculate different strategies. However, dependability engineering assets needs be assessed in order make an estimation NPV. Therefore, purpose this paper critically analyse standardised indicators find most essential for Terminology containing performance killers are common field asset management, but not many publications can found their detailed...

The system of performance measurement maintenance function should cover all processes related to it within the organization. There must be an interconnection between different indicators, so numbers can interpreted in order reach a good conclusion for decision making. This premise implies hierarchy indicators needed dual way. First, will require segmented according areas influence rest organization, posed by interactions with finance department, human resources, purchasing, and, course,...

The maintenance performance measurement is often faced with a lack in knowledge about the real function of department within organizations, and consequently absence appropriate targets emanating from global mission vision. These facts bring metrics not adapted to needs, which has strong load human factor without roadmap amount data be collected, their processing use decision making. This article proposes model where qualitative quantitative methods are combined order complement advantages...

Railway traffic has increased over the last decade due to its fuel efficiency and need reduce emissions. The railway infrastructure performance needs be measured allow assets managed effectively against set objectives. Various systems are used collect store data on traffic, failures, inspections, track quality, etc. However, these often in an ad hoc manner, partly because of weaknesses traditional measurement systems. This paper proposes a link effect model which is focused areas continuous...

The assessment and analysis of railway infrastructure capacity is an essential task in management carried out to meet the required quality demand transport. For sustainable dependable management, it important assess limitation from point view performance. However, existence numerous performance indicators often leads diffused information that not a format suitable support decision making. In this paper, we demonstrated use fuzzy inference system for aggregating selected relate maintenance...

Abstract In this work, the essential work of fracture (EWF) method is introduced for a peridynamic (PD) material model to characterize toughness ductile materials. First, an analytical derivation path-independence PD J -integral provided. Thereafter, classical and are computed on number crack problems, subsequent investigation how it performs under large scale yielding thin sheets. To represent highly nonlinear elastic behavior, new adaptive bond stiffness calibration modified bond-damage...

In reliability and maintenance engineering, availability can be described as the ability of an item to in a state perform required function at given time. Availability is commonly measure between zero one, where one means probability available for use time 100%. measured many areas, such electronics, information technologies, military equipment, electrical grids industry. Various indicators related railways have been examined by academia However, there some ambiguity about how define rail...

Railway traffic has increased over the last decade and it is believed to increase further with movement of transportation from road rail, due increasing energy costs demand reduce emissions. To manage assets effectively within business objectives, effect maintenance activities must be measured monitored. Performance indicators are continuously identified developed support infrastructure managers in decision making, but they often ad-hoc seldom standardised. In this paper, about 130...

In this study, near-surface cracks in a railhead are inspected thoroughly using phased array ultrasonic testing (PAUT). This research finds an alternative technique to inspect for because the conventional non-destructive method rail inspection lacks capacity crack profile. study shows that PAUT can determine not only depth but also profile, so inspector estimate stage of growth and how propagates. information is valuable maintainer as one considerations deciding thickness metal remove when...

The friction forces between the wheel and rail depend on a number of variables including third body layer at wheel–rail interface, profiles, train dynamics. significantly influences damage mechanisms wheel-rail especially wear, rolling contact fatigue (RCF), corrugations other surface defects that then require maintenance. introduction additional constituents interface in form an additive with anti-wear anti-crack properties can reduce wear RCF. In general, such also reduces friction....

Rail issues such as corrugation, rolling contact fatigue, noise and wear have been increasing with the increase in railway traffic. The application of top-of-rail friction modifiers (TOR-FMs) is claimed by their manufacturers industry to be a well-established technique for resolving above-mentioned issues. There are various methods applying at wheel–rail interface, among which stationary wayside systems recommended TOR-FM when distance few kilometres covered. also claim that using equipment,...

Railways are large, geographically dispersed assets, consisting of numerous systems, subsystems and components, for which considerable amounts data indicators generated monitoring their operation maintenance. Proper assessment maintenance performance is essential sustainable competitive rail transportation. Composite (CIs), or indices, can simplify the measurement by summarising overall a complex asset into single figure, making it easier to interpret than multiple plots. In this article, CI...

Abstract The J -integral is in its original formulation expressed as a contour integral. was, however, found cumbersome early on to apply the finite element analysis, for which method more directly applicable -area integral was later developed. In previous study, we -contour function of displacements only, make peridynamics (Stenström and Eriksson Int Fract 216:173–183, 2019). this article extend work include by deriving it obtain alternative calculating well. properties area are then...

Abstract In peridynamics, boundary effects generally appear due to nonlocality of interparticle forces; in particular, end are found 1D bars. a previous work by Eriksson and Stenström ( J Peridyn Nonlocal Model 2(2):205–228, 2020), simple method remove certain types bars, or homogenize such was presented for bars with constant micromodulus. this work, which is continuation the homogenizing procedure applied linear, “triangular,” For examples studied, common practice, linear elastic behavior...

The measurement of maintenance performance is often faced with a lack in knowledge about the real function department within organisations, and consequently appropriate targets from global mission vision are absence. Measurement metrics not adapted to needs, which have strong human factor; nor there roadmap amount data be collected, their processing or how they used decision making. This article proposes model where qualitative quantitative methods combined complement advantages both.