Prediction of residual stresses and distortions induced by nitriding of complex 3D industrial parts

Depouhon, P.; Sprauel, Jean‐Michel; Mermoz, Emmanuel

doi:10.1016/j.cirp.2015.03.006

Cited by 9 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…If the latter is known, or if it can be estimated with sufficient accuracy, then the computation of stresses and distortions -the direct problem -can be dealt with as an inclusion problem (Mura, 1987). This approach has been successfully applied to a variety of engineering problems as illustrated by Deng et al (2007), Hu et al (2015), and Depouhon et al (2015) where the authors respectively investigated residual stresses and distortions induced by welding, laser peening and thermo-mechanical treatments. In all of these studies, the authors made use of a two-step procedure involving a local analysis to compute eigenstrains followed by a global springback analysis to obtain the final deformed shape.…”

Section: Eigenstrainsmentioning

confidence: 99%

Simulating shot peen forming with eigenstrains

Faucheux

Gosselin

Lévesque

2018

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Shot peen forming is a cold work process used to shape thin metallic components by bombarding them with small shots at high velocities. Several simulation procedures have been reported in the literature for this process, but their predictive capabilities remain limited as they systematically require some form of calibration or empirical adjustments. We intend to show how procedures based on the concept of eigenstrains, which were initially developed for applications in other fields of residual stress engineering, can be adapted to peen forming and stress-peen forming. These tools prove to be able to reproduce experimental results when the plastic strain field that develop inside a part is known with sufficient accuracy. They are, however, not mature enough to address the forming of panels that are free to deform during peening. For validation purposes, we peen formed several 1 by 1 meter 2024-T3 aluminum alloy panels. These experiments revealed a transition from spherical to cylindrical shapes as the panel thickness is decreased for a given treatment, that we show results from an elastic instability.

show abstract

Section: Eigenstrainsmentioning

confidence: 99%

Simulating shot peen forming with eigenstrains

Faucheux

Gosselin

Lévesque

2018

Journal of Materials Processing Technology

View full text Add to dashboard Cite

show abstract

“…Concerning the connecting rod, a specific discretization technique was employed that consisted of generating a regular boundary layer on the external surfaces of the component using pentahedrons (six nodes, isoparametric, six integration points), while the interior of the body was discretized employing tetrahedrons (four nodes, isoparametric, one integration point) (see Figure 3) [28]. This strategy enabled the model to better grasp stresses and displacements along the contact regions, thanks to the high number of integration points these elements offer compared to standard tetrahedrons and the regular thickness of the boundary layer [29,30]. The average element size was 0.75 mm, and it was homogeneous along the surface of the domain, while a coarsening factor was used for the discretization of the inner volume of the conrod.…”

Section: The Finite Element Modelmentioning

confidence: 99%

“…integration point) (see Figure 3) [28]. This strategy enabled the model to better grasp stresses and displacements along the contact regions, thanks to the high number of integration points these elements offer compared to standard tetrahedrons and the regular thickness of the boundary layer [29,30]. The average element size was 0.75 mm, and it was homogeneous along the surface of the domain, while a coarsening factor was used for the discretization of the inner volume of the conrod.…”

Section: The Finite Element Modelmentioning

confidence: 99%

Finite Element Analysis of the Influence of the Assembly Parameters on the Fretting Phenomena at the Bearing/Big End Interface in High-Performance Connecting Rods

Renso,

Barbieri,

Mangeruga

et al. 2023

Lubricants

View full text Add to dashboard Cite

Fretting fatigue is a well-known and dangerous damage mode that occurs on the mating surfaces of mechanical components, mainly promoted by a combination of stress distribution, contact pressure distribution, and relative sliding (micro)motion between the surfaces. However, predicting this mechanism is challenging, necessitating specific studies for each assembly due to variable influences. This article presents a methodology for evaluating fretting fatigue damage at the contact between a titanium connecting rod big end and the bearing, adopting the Ruiz parameter as a quantifying damage index. For this purpose, a thermal-structural finite element model is prepared. In particular, the machining and assembly of the split conrod big end are simulated, considering thermal effects. A full engine cycle is first simulated, and results are used for identifying critical instants to be considered for accurate yet computationally efficient calculations. The dependence of fretting fatigue on three factors is studied: bearing crush, bolts tightening torque, and friction coefficient between the big end and the bearing. In summary, the damage increases with a higher crush and friction, while tightening torque has marginal effects. Following a 20% increase in crush height, a corresponding 10% rise in the Ruiz parameter is observed. Conversely, reducing the crush height by 20% leads to an approximately 8% decrease in the Ruiz parameter. When the influence of the bolt preload is taken into account, only a marginal 1% increase of the Ruiz parameter is recorded despite a 30% rise in preload. Evaluating the impact of the friction coefficient on the Ruiz parameter reveals an almost linear relationship. These findings suggest that adjusting the screw preload can enhance the hydrodynamic behavior of the bearing without exacerbating fretting. Furthermore, exploiting the linear correlation between Ruiz and the friction coefficient allows for the generalization of results obtained with specific coefficient values. This methodology can, therefore, serve as a valuable reference for adjusting different variables during the initial design phases of a four-stroke internal combustion engine’s dismountable connecting rod.

show abstract

“…При термообработке низко-и среднелегированных сталей часто возникают такие дефекты термической обработки, как неполная закалка, которые могут быть связаны с недогревом стали или недостаточной интенсивностью охлаждения при закалке. Неоднородная структура стали перед азотированием негативно влияет на стабильность результатов азотирования и размеров деталей после ИПА [11]. При получении нестабильных результатов азотирования, которые характеризуются точечными вылетами значений микротвердости после азотирования, был проведен количественный анализ микроструктуры.…”

Section: ключевые слова: роликовинтовая передача электромеханическийunclassified

Technological features of nitrogening thread surfaces of critical parts of electromechanical drive

Ivanenko¹,

Тулькова²,

Уваров³

2018

Izv. vysš. učebn. zaved., Priborostr.

View full text Add to dashboard Cite

Prediction of residual stresses and distortions induced by nitriding of complex 3D industrial parts

Cited by 9 publications

References 7 publications

Simulating shot peen forming with eigenstrains

Simulating shot peen forming with eigenstrains

Finite Element Analysis of the Influence of the Assembly Parameters on the Fretting Phenomena at the Bearing/Big End Interface in High-Performance Connecting Rods

Technological features of nitrogening thread surfaces of critical parts of electromechanical drive

Contact Info

Product

Resources

About