Failure analysis of a sugarcane loader rear shaft

Azevedo, Thiago Figueiredo; Sampaio, Weslley Rick Viana; Cãmara, Eduardo César Bezerra; Lima, Gustavo Dória; Silva, Wisnner Franklin dos Santos; Ramos, Simone da Silva

doi:10.1016/j.engfailanal.2019.104326

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…At fracture region 1, as shown in Figure 7b, distinct radial extensions of the radial texture can be observed. Some wear is also present under high magnification, and the microscopic morphology primarily consists of tear contours, indicating that the drive shaft experienced significant bending loads and developed early cracks [39]. In Figure 7c, fracture region 2 exhibits a quasi-cleavage micromorphology, which is a characteristic feature of fatigue crack extension.…”

Section: Fracture Surfacementioning

confidence: 98%

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Huang,

Wang,

et al. 2024

Metals

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This paper investigates the failure mechanism of the rear drive shaft in a modified pickup truck which had operated for about 3000 km. The investigation included macroscopic and microscopic evaluation to document the morphologies of the fracture surface, measurement of the material composition, metallographic preparation and examination, mechanical testing, and finite element modelling and calculations. The results obtained suggest that rotation-bending fatigue was the primary cause of the drive shaft failure. The crack initiation is located in the root of the machined threads on the drive shaft surface and expanded along the side of the machining line surface. The main cause of fatigue cracks is attributable to a high stress concentration owing to a large unilateral bending impact under overload. Meanwhile, the bidirectional torsional force also produces a higher stress concentration and thus accelerates the fatigue crack to expand radially along the surface. Furthermore, the hardness of the central section of the drive shaft was marginally below standard. This deficiency results in harm to the bearings and other mechanical components, as well as expediting the enlargement of cracks. Finite element analysis revealed significant contact stress between the bearing and drive shaft, with stress levels exceeding the fatigue limit stress of the parent material. This highlights the need for reevaluation of the heat treatment process and vehicle loading quality to enhance the drive shaft’s longevity.

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Section: Fracture Surfacementioning

confidence: 98%

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Huang,

Wang,

et al. 2024

Metals

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“…Se o carregamento variável prosseguir, a trinca cresce até atingir o tamanho suficiente para produzir a ruptura final. Em relação às tensões, a mais importante para a propagação das trincas são as tensões de tração (ROSA, 2002;AZEVEDO, 2020).…”

Section: Falhas Estruturais Mecânicas: Modos De Falha Dependentes Do ...unclassified

“…A simulação numérica para análise de causas de falhas tem-se mostrado uma ferramenta poderosa que permite a operação virtual de um sistema em condições controladas e auxilia na observação de causas de falhas muito próximas às condições reais (AZEVEDO, 2020).…”

Section: Método Dos Elementos Finitosunclassified

Análise de falha por fratura de eixo do sistema de rodado de um distribuidor de fertilizante orgânico líquido

Grotto¹,

Meira²,

Walber³

2020

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Este trabalho apresenta uma avaliação de falha por fratura de eixo do sistema de rodado de um implemento agrícola Distribuidor de Adubo Orgânico Líquido (DAOL). É realizada uma avaliação da falha, sob ponto de vista metalúrgico, por meio de avaliações macrográficas, micrográficas, determinação da composição química e dureza do material e microscopia eletrônica de varredura (MEV). Também se apresenta a avaliação da falha à ótica estrutural, através de uma análise de falha por fadiga, utilizando o método dos elementos finitos, determinando coeficiente de segurança e vida do eixo. Determina-se que a característica da fratura corresponde a de uma falha por fadiga, vê-se o ponto de início da falha, avalia-se a região rugosa e a região polida da seção transversal fraturada. Além disso, apresenta-se o valor da vida do eixo em número de ciclos de carga máxima e o coeficiente de segurança para uma falha por fadiga. Palavras-chave: Fadiga. Método dos elementos finitos. Micrografia/macrografia.

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“…Furthermore, the shape of crack morphology was compared with numerical and experimental results. Azevedo [21] claimed that rounding radius in the shaft base was the cause of failure employing finite element simulation of a sugarcane loader rear shaft. Aliakbari analyzed the failure of a ductile iron crankshaft in a compact pickup truck diesel engine and contributed its failure to the low cycle fatigue [22].…”

Section: Introductionmentioning

confidence: 99%

Impact Analysis of Initial Cracks’ Angle on Fatigue Failure of Flange Shafts

Cui

et al. 2022

Coatings

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A fatigue test on the failure mode of flange shafts was conducted. The propagation characteristics of the initial crack at the junction between the shaft and the flange as well as its angle effect were studied. This study developed an analysis program of fatigue crack propagation, based on the APDL (ANSYS Parametric Design Language). It obtained the effective angle interval within which the initial crack is able to propagate. The fitting calculation formula was derived and the results showed that: (1) The initial crack at the junction between the shaft and the flange would propagate in the radial and axial directions; the unstable crack propagation would cause an abrupt fracture of the cross-section, failing connection; and the angle of initial crack was uncertain. (2) The crack followed the I-II-III mixed mode, which was dominated by mode I. An initial crack with a larger angle showed more noticeable II-III characteristics; KII and KIII affected the crack’s propagation angle in the radial and axial directions and they also affected the structure’s surface direction. (3) The deepest point A of the crack was located at the junction between the shaft and the flange. Its crack propagation can be divided into three stages: rapid growth (stage 1), steady decline (stage 2, buffer stage), and instability (stage 3). The initial crack angle not only affected the propagation rate at stage 1 but also influenced the fatigue life distribution of the structure during propagation. The larger the initial crack angle was, the smaller the proportion of buffer stage in the total fatigue life would be. Moreover, the propagation of crack with a larger initial angle reached instability faster after stage 1, which would cause an abrupt fracture of the cross-section. This was unfavorable for deciding the crack detection time or carrying out maintenance and reinforcement. (4) The crack propagation at the junction between the shaft and the flange was determined by the size relation between ΔKI and ΔKth, instead of the effective stress intensity factor. The effective stress intensity factor can partly reflect the law of crack propagation, but cannot serve as the only criterion for crack propagation; it must be combined with the effective angle interval, which was negatively correlated with the crack’s shape ratio, to determine whether the crack would propagate.

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Failure analysis of a sugarcane loader rear shaft

Cited by 11 publications

References 13 publications

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Análise de falha por fratura de eixo do sistema de rodado de um distribuidor de fertilizante orgânico líquido

Impact Analysis of Initial Cracks’ Angle on Fatigue Failure of Flange Shafts

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