Prediction of Service Life for Machines and Structures

Bolotin, V. V.; Fan, Hui

doi:10.1115/1.2929902

Cited by 60 publications

(77 citation statements)

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“…The total fatigue life was thereby divided into two phases so that the linear damage rule could be applied in each phase of the life. A concept similar to the damage curve approach was proposed by Bolotin (1989) with a mathematical representation which does not necessarily assess the damage on the basis of cycles and is more appropriate for modeling in the continuous-time setting. Therefore, Bolotin's approach is adopted in this research for the development of a continuous-time model with nonlinear damage accumulation.…”

Section: Results Of Simulation Experimentsmentioning

confidence: 99%

“…A cycle-based approach is then used to estimate the fatigue damage from the strain-life CUlVes which are obtained through experiments at different levels of stress and strain amplitudes. The total accumulated damage is computed using the Palmgren-Miner rule [Miner (1945)] and subsequently modified via the damage curve approach [Bolotin (1989)]. …”

Section: Modeling Of Fatigue Damage Dynamicsmentioning

confidence: 99%

See 1 more Smart Citation

Damage-mitigating control of space propulsion systems for high performance and extended life

Ray

Dai

et al. 1993

29th Joint Propulsion Conference and Exhibit

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A major goal in the control of complex mechanical systems such as spacecraft rocket engines, advanced aircraft, and power plants is to achieve high performance with increased reliability, availability, component durability, and maintainability. The current practice of decision and control systems synthesis focuses on improving performance and diagnostic capabilities under constraints that often do not adequately represent the materials degradation. In view of the high performance requirements of the system and availability of improved materials, the lack of appropriate knowledge about the properties of these materials will lead to either less than achievable performance due to overly conservative design, or over-straining of the structure leading to unexpected failures and drastic reduction of the service life. The key idea in this repon is that a significant improvement in service life could be achieved by a small reduction in the system dynamic performance. The major task is to characterize the damage generation process, and then utilize this information in a mathematical form to synthesize a control law that would meet the system requirements and simultaneously satisfy the constraints that are imposed by the material and structural properties of the critical components.The concept of damage mitigation is introduced for control of mechanical systems to achieve high performance with a prolonged life span. A model of fatigue damage dynamics is formulated in the continuous-time setting, instead of a cycle-based representation, for direct application to control systems synthesis. An optimal control policy is then formulated via nonlinear programming under specified constraints of the damage rate and accumulated damage. The results of simulation experiments for the transient upthrust of a bipropellant rocket engine are presented to demonstrate efficacy of the damage-mitigating control concept

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Section: Results Of Simulation Experimentsmentioning

confidence: 99%

Section: Modeling Of Fatigue Damage Dynamicsmentioning

confidence: 99%

Damage-mitigating control of space propulsion systems for high performance and extended life

Ray

Dai

et al. 1993

29th Joint Propulsion Conference and Exhibit

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“…In this case, the one-sided power spectral density, W(f), corresponding to the ARMA (p, q) model is given by8,9 (2) where u~ is the variance of a(t), f is the linear frequency, and i = H.…”

Section: Time Domain Analysismentioning

confidence: 99%

A Survey of Probabilistic Service Life Prediction Methods for Structures

Heller

Thangjitham

1994

Probabilistic Structural Mechanics: Advances in Structural Reliability Methods

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Abstract. This paper presents an overview of some proposed probabilitybased service life prediction methods. Primary concern is focused on the methods that are of interest in service life assessment of an outdoor structure. The survey includes methods for characterizing random load histories, for modeling material deterioration, and for evaluating both instantaneous and progressive probabilities of failure. A numerical example, showing the service life and reliability of a viscoelastic structure under outdoor environmental loadings, is given.

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“…It should be emphasized that the exploration of shelves belongs to the spheres of human activity with the lowest indexes of safety [4]. Crashes and accidents during operation of sea oil producing platforms constitute a great hazard for the staff and lead to considerable financial losses and damage to ecology.…”

Section: Introductionmentioning

confidence: 99%