Reliability-based approach for structural integrity assessment of a bucket wheel excavator

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-01-16 DOI:10.1016/j.tafmec.2025.104849

Ana Petrović , Nikola Momčilović , Aleksandar Sedmak , Branislav Đorđević , Dorin Radu , Vesna Milošević-Mitić , Aleksandar Bogojević

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引用次数: 0

Abstract

Existing studies dealing with structural strength of bucket wheel excavators (BWE) include a traditional approach that does not take into account the whole structural response of the object, but only considers the maximum response at the single location. To solve this issue, this paper proposes assessment of the structural response of BWE SchRs 630 that separates structural from mechanical failures, and predicts the reliability of the design. Firstly, stress results from finite element analysis for different loading scenarios are obtained. Three loading scenarios are included: (i) working load and steel weight (deadweight); (ii) steel weight; (iii) steel weight and inertial forces induced by slew drive breaking. In that way the whole in-service cycle of the BWE would be covered. Stresses and the yield criteria are treated as random variables in order to produce their probability density functions, which are compared to evaluate structural response. Monte Carlo method is used for the calculation of the structure’s probability of failure and consequently, reliability and reliability index. That means that the whole structure response is described using one single value − probability of failure. Also, the analysis has shown that the probability of failure starts to rise more rapidly for the reduction factor (RF) below the 0.6–0.7 range. This study confirms design code recommendation value for the criterion of yield stress limit reduction factor RF = 0.67. In addition, assessment of potential cracks was performed to obtain overall structural integrity assessment (OSIA) of the structure. Based on those results, reliability can be increased by small local improvements.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.