A New Approach to Modeling the Ductile Cast Iron Microstructure for a Finite Element Analysis

Basurto-Hurtado, Jesus A.; Pérez-Soto, Gerardo I.; Osornio-Ríos, Roque Alfredo; Domínguez-González, Aurelio; Morales-Hernandez, Luis A.

doi:10.1007/s13369-018-3465-y

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…To put it plainly, the meaning of connection point has drawn huge attention from numerous researchers who concentrate on a wide scope of controls. On the opposite side, the FEA or Finite Element Analysis is a solid method that has been utilized by numerous specialists [20]. So, this study provides an insight into the FEA method for patient-specific and biomedical applications.…”

Section: Literature Reviewmentioning

confidence: 99%

Archive of Mechanical Engineering

Asiri

2021

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Functionally Graded Materials (FGM) are extensively employed for hip plant component material due to their certain properties in a specific design to achieve the requirements of the hip-joint system. Nevertheless, if there are similar properties, it doesn't necessarily indicate that the knee plant is efficiently and effectively working. Therefore, it is important to develop an ideal design of functionally graded material femoral components that can be used for a long period. A new ideal design of femoral prosthesis can be introduced using functionally graded fiber polymer (FGFP) which will reduce the stress shielding and the corresponding stresses present over the interface. Herein, modal analysis of the complete hip plant part is carried out, which is the main factor and to date, very few research studies have been found on it. Moreover, this enhances the life of hip replacement, and the modal, harmonic, and fatigue analysis determines the pre-loading failure phenomena due to the vibrational response of the hip. This study deals with the cementless hip plant applying the finite element analysis (FEA) model in which geometry is studied, and the femoral bone model is based in a 3D scan.

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Section: Literature Reviewmentioning

confidence: 99%

Archive of Mechanical Engineering

Asiri

2021

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“…Creep became a concern above approximately 425 • C [32]. Basurto-Hurtado et al [33] proposed a novel methodology for generating geometric models that represent the microstructure of ductile cast iron (DCI). The approach involves using image processing algorithms to extract the contours of graphite nodules and employing Bezier curves to smooth the geometric models.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fracture Toughness Prediction of Ductile Cast Iron under Thermomechanical Treatment

Abdellah,

Alharthi,

Alfattani

et al. 2024

Metals

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Temperature has a great influence on the mechanical properties of ductile cast iron or nodular cast iron. A thermomechanical treatment was carried out at various elevated temperatures of 450 °C, 750 °C and 850 °C using a universal testing machine with a tub furnace. Specimens were held at these temperatures for 20 min to ensure a homogeneous temperature distribution along the entire length of the specimen, before a tensile load was applied. Specimens were deformed to various levels of uniform strain (0%, 25%, 50%, 75%, and 100%). These degrees of deformation were measured with a dial gauge attached to a movable cross plate. Three strain rates were used for each specimen and temperature: 1.8×10−4 s−1, 9×10−4 s−1 and 4.5×10−3 s−1. A simple analytical model was extracted based on the CT tensile test geometry and yield stress and a 0.2% offset strain to measure the fracture toughness (JIC). To validate the analytical model, an extended finite element method (XFEM) was implemented for specimens tested at different temperatures, with a strain rate of 1.8×10−4 s−1. The model was then extended to include the tested specimens at other strain rates. The results show that increasing strain rates and temperature, especially at 850 °C, increased the ductility of the cast iron and thus its formability. The largest percentage strains were 1 and 1.5 at a temperature of 750 °C and a strain rate of 1.8×10−4 s−1 and 9×10−4 s−1, respectively, and reached their maximum value of 1.7 and 2.2% at 850 °C and a strain rate of 9×10−4 s−1 and 4.5×10−3 s−1, respectively. In addition, the simple and fast analytical model is useful in selecting materials for determining the fracture toughness (JIC) at various elevated temperatures and different strain rates.

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“…Several authors [15,[19][20][21][22][23][24] have conducted finite element analysis (FEA)-assisted studies to examine ADIs and DCIs at the microscopic level. FEA simulations aim to determine the lifetime of a component by understanding the failure mechanisms of the material, including factors influencing fatigue, such as stress intensity factors.…”

Section: Introductionmentioning

confidence: 99%

A Bidimensional Finite Element Study of Crack Propagation in Austempered Ductile Iron

França,

Assumpção,

Luersen

et al. 2023

CMC

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Austempered ductile iron (ADI) is composed of an ausferritic matrix with graphite nodules and has a wide range of applications because of its high mechanical strength, fatigue resistance, and wear resistance compared to other cast irons. The amount and size of the nodules can be controlled by the chemical composition and austenitizing temperature. As the nodules have lower stiffness than the matrix and can act as stress concentrators, they influence crack propagation. However, the crack propagation mechanism in ADI is not yet fully understood. In this study, we describe a numerical investigation of crack propagation in ADIs subjected to cyclic loading. The numerical model used to calculate the stress intensity factors in the material under the given conditions is built with the aid of Abaqus commercial finite element code. The crack propagation routine, which is based on the Paris law, is implemented in Python. The results of the simulation show that the presence of a nodule generates a shear load on the crack tip. Consequently, even under uniaxial tensile loading, the presence of the nodule yields a non-zero stress intensity factor in mode II, resulting in a deviation in the crack propagation path. This is the primary factor responsible for changing the crack propagation direction towards the nodule. Modifying the parameters, for example, increasing the nodule size or decreasing the distance between the nodule and crack tip, can intensify this effect. In simulations comparing two different ADIs with the same graphite fraction area, the crack in the material with more nodules reaches another nodule in a shorter propagation time (or shorter number of cycles). This suggests that the high fatigue resistance observed in ADIs may be correlated with the number of nodules intercepted by a crack and the additional energy required to nucleate new cracks. In summary, these findings contribute to a better understanding of crack propagation in ADIs, provide insights into the relationship between the presence of nodules and the fatigue resistance of these materials, and support studies that associate the increased fatigue resistance with a higher number of graphite nodules. These results can also help justify the enhanced fatigue resistance of ADIs when compared to other cast irons.

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A New Approach to Modeling the Ductile Cast Iron Microstructure for a Finite Element Analysis

Cited by 6 publications

References 21 publications

Archive of Mechanical Engineering

Archive of Mechanical Engineering

Mechanical Properties and Fracture Toughness Prediction of Ductile Cast Iron under Thermomechanical Treatment

A Bidimensional Finite Element Study of Crack Propagation in Austempered Ductile Iron

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