Numerical analysis of a railroad bolt hole fracture problem

Mayville, Ronald A.; Stringfellow, Richard

doi:10.1016/0167-8442(95)00026-b

Cited by 29 publications

(22 citation statements)

References 1 publication

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“…These are the main cause of failures at boltholes in fishplate-joined rails [14]. An example of the history of the shear force at a bolthole during a wheel passage is given in Figure 7 [16]. Note that shear stresses play a major role in rails with cracks where they cause mixed mode loading conditions such as illustrated in Figure 8.…”

Section: Shear Stressesmentioning

confidence: 99%

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Introduction to the damage tolerance behaviour of railway rails – a review

Zerbst¹,

Lundén

Edel

et al. 2009

Engineering Fracture Mechanics

174

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Despite substantial advantages in material development and in periodic non-destructive inspection together with periodic grinding and other measures in order to guarantee safe service, fatigue crack propagation and fracture is still in great demand as emphasised by the present special issue. Rails, as the heart of the railway system, are subjected to very high service loads and harsh environmental conditions. Since any potential rail breakage includes the risk of catastrophic derailment of vehicles, it is of paramount interest to avoid such a scenario. The aim of the present paper is to introduce the most important questions regarding crack propagation and fracture of rails. These include the loading conditions: contact forces from the wheel and thermal stresses due to restrained elongation of continuously welded rails together with residual stresses from manufacturing and welding in the field, which is discussed in Section 2. Section 3 provides an overview of crack-type rail defects and potential failure scenarios. Finally the stages of crack propagation from initiation up to final breakage are discussed.

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Section: Shear Stressesmentioning

confidence: 99%

“…Static rail shear force at the first bolt hole in a rail during wheel passage (when the joint slightly loosens, this stress distribution changes) (according to [16]). …”

Section: Figurementioning

confidence: 99%

Introduction to the damage tolerance behaviour of railway rails – a review

Zerbst¹,

Lundén

Edel

et al. 2009

Engineering Fracture Mechanics

174

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“…Comparisons with other rail fatigue data suggest that the Jensen data represent rail properties associated with fatigue lives in the first-percentile range. 5 The calculations for the fatigue life of joint bars are carried out using Miner's Law expressed as…”

Section: Fatigue Life Estimatesmentioning

confidence: 99%

“…The Jensen fatigue properties for rail steel are incorporated into this equation by assuming the following values: N 0 = 10 7 cycles, S 0 = 32,000 lb/in 2 , S U = 130,000 lb/in 2 , and k =0.14. The mean and alternating stresses in Equation (13) are calculated from 5 First-percentile life means the time at which one percent of a large population of rails can be expected to have formed a sharp, visible crack. …”

Section: Fatigue Life Estimatesmentioning

confidence: 99%

“…For example, particular attention has been given to the formation and growth of an internal rail defect called a detail fracture [1,2]. Although research has been conducted to examine bolt-hole cracking [3,4,5], the structural integrity of bolted rail joints has not been studied as thoroughly as that in CWR. The emphasis on defects in continuous welded rail stems, in large part, from the increasing trend in the railroad industry to replace bolted joint rail with CWR.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the Fatigue Life of Railroad Joint Bars

Talamini

Jeong

Gordon

2007

ASME/IEEE 2007 Joint Rail Conference and Internal Combustion Engine Division Spring Technical Conference

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This paper investigates the influence of physical track conditions in the vicinity of a rail joint on the fatigue life of the joint bars. Recent derailments due to broken joint bars, such as the Minot, ND accident in January 2002, have highlighted the need for better understanding of the effects of joint conditions on premature joint bar failure. Fatigue life estimates can be used to guide the selection of inspection intervals for joint bars in service. Engineering approximations are used to infer the dynamic load factor at a rail joint due to joint characteristics including: • rail end gap; • joint efficiency (looseness); • track stiffness (vertical foundation modulus). A three-dimensional finite element analysis of a rail joint is conducted and the dynamic load is applied to develop an estimate of the live (bending) stresses at the joint due to passing wheels. These stresses are then used to estimate the fatigue life of the joint bars. The methodology is demonstrated for 132RE rail with companion joint bars. The effect of thermal expansion (or the temperature difference below the rail neutral temperature) is investigated. Typical wheel loads and railcar speeds are considered and results are presented for a baseline a joint condition.

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Experimental Investigation Into the Condition of Insulated Rail Joints by Impact Excitation

et al. 2015

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This paper presents a feasibility study to determine if the health condition of Insulated Rail Joints (IRJs) can be assessed by examining their dynamic response to impact excitation. First, a reference dynamic behavior is defined in the frequency domain of 50-1200 Hz based on field hammer test measurements performed on a IRJ baseline (i.e., a set of IRJ without visible damage). Then, measurements on IRJs with different damage states are compared to the IRJ baseline response via the frequency response function (FRF) based statistical method. Three cases of IRJs are analyzed: a IRJ with a broken fastening, a IRJ with a damaged insulation layer and a IRJ with a rail top with plastic deformation. Combining hammer test measurements, hardness measurements and pictures of the IRJs, two frequency bands were identified as characteristic for damaged IRJs. In the identified high frequency band (1000-1150 Hz), the measured dynamic response with both a vehicle-borne health monitoring system and hammer tests shows a clear difference between the damaged IRJs and the IRJ baseline. Furthermore, different damage types may be able to be identified by examining the dynamic responses in the identified mid-frequency band (420-600 Hz). Further analysis over a larger number of IRJs may complete and support the promising results so that the information can be employed for the condition assessment and monitoring of IRJs.

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Numerical analysis of a railroad bolt hole fracture problem

Cited by 29 publications

References 1 publication

Introduction to the damage tolerance behaviour of railway rails – a review

Introduction to the damage tolerance behaviour of railway rails – a review

Estimation of the Fatigue Life of Railroad Joint Bars

Experimental Investigation Into the Condition of Insulated Rail Joints by Impact Excitation

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