Fatigue strength and residual stress of groove-rolled products

Kim, W.; Kawai, Ken-ichi; Koyama, Hiroshi; Miyazaki, Daisuke

doi:10.1016/j.jmatprotec.2007.03.124

Cited by 24 publications

(8 citation statements)

References 2 publications

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“…One of the major reasons is the difficulty to quantify the residual stress locally acting on the thread root. Hagiwara et al (Hagiwara et al, 1989) tried to measure the residual stress on the bolt thread root by using X-ray diffraction method and Heyn-Bauer method, and Kim et al (Kim et al, 2007) has tried to quantify the residual stress at the groove-rolled product by direct measurement and estimation using 3D FE analysis. However, we are still not able to answer the simple question how much the residual stress is generated on the bolt thread root by thread rolling process.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the residual stress on the thread root generated by thread rolling process

Furukawa

Hagiwara

2015

Mechanical Engineering Journal

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Yoshimoto had been presented a hypothesis concerning the fatigue strength of a bolt in bolt/nut assembly using Ishibashi's hypothesis on the relationship between the fatigue notch factor and the local stress distribution on the first thread root of a bolt mated with nut. By using Yoshimoto's hypothesis, the effect of the manufacturing process (sequence or order of thread rolling and heat treatment processes) on the fatigue strength can be explained in connection with the axial residual stress at the first thread root of a bolt as a change of mean stress level. However, this hypothesis has not yet been verified quantitatively since the axial residual stress which may exist locally around the thread root could neither be measured nor estimated with sufficient accuracy. This study aims to quantify the axial residual stress on the thread root generated by thread rolling process. For this purpose, a method for simulating thread rolling process by using 3D elastic-plastic FEM was proposed to estimate the axial residual stress distribution by using precisely determined material property. Calculated results for two types of test specimens, one is grooved specimen with larger root radius and the other is leadless bolt specimen having the same thread profile as M10×1.25 bolts, show that the axial compressive residual stress of 1000 MPa level is generated at the root of the specimens. Finally, the validity of the simulation was confirmed through the X-ray stress measurement for grooved specimen, and the fatigue tests for leadless bolt specimen.

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Section: Introductionmentioning

confidence: 99%

Estimation of the residual stress on the thread root generated by thread rolling process

Furukawa

Hagiwara

2015

Mechanical Engineering Journal

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“…Kumar et al (2004) and Milad et al (2008) state that for austenitic stainless steel unstable austenite partially transforms into martensite, greatly increasing the mechanical strength and hardness. Kim et al (2007) have studied exactly this relation and their results showed good agreement between numerically predicted plastic strain and experimentally obtained hardness values.…”

Section: Introductionmentioning

confidence: 56%

Predicting plastic deformation and work hardening during V-band formation

Müller

Barrans

Blunt

2011

Journal of Materials Processing Technology

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V-Band Clamps are manufactured using a cold roll forming process consisting of six passes which plastically deform an initially flat strip by bending to produce the band's V-section. In this paper a new method of validating numerically predicted plastic deformation in a cold formed metal strip is presented. Tensile testing of samples of the band's material was used to obtain a direct link between plastic strain and work hardness of this particular material. Using this correlation, the equivalent plastic strain (PEEQ) values predicted by finite element simulations were converted into hardness values.These values were compared to experimental work, in which samples of each pass of the roll forming process were taken to determine the work hardness in the cross section of the V-band using a microhardness machine. The error in strain predicted by the numerical method and hardness obtained by testing was found to be between 0.4% and 16.9%. This error was mainly due to uncertainty in material properties and the accuracy of the measurement technique. Compared to the more classical approach of measuring strain distribution with strain gauges, this method is more precise and accurate, as it is able to pick up even small changes in strain distribution.

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“…6 These forming processes can save the material 7 and improve the performances of component. 8,9 The rolling process of threads has widely applied to manufacture connectors and fasteners. The methods of the rolling process mainly include rolling with flat dies and round dies (two or three).…”

Section: Introductionmentioning

confidence: 99%

The importance of forming parameters on rolling process and the performances of component in forming long threads

Zhang

Fan

Dong

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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The axial self-infeed rolling process is an advanced and efficient process to form long threads such as lead screw and thread shaft. The experiments of axial self-infeed rolling process for the stainless steel were conducted with three blank diameters, forming speeds and two lubrication conditions. The effects of forming speed, blank diameter and lubrication condition on forming torque, microhardness and tooth height of forming threads were analyzed by the design of experiment and analysis of variance. And the characteristics of forming torque, microhardness distribution and tooth height were investigated. The results revealed the forming torque was more influenced by the blank diameter and the forming speed than the lubrication condition. The tooth height was sensitive to all these factors and the microhardness only was affected by the blank diameter.

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Fatigue strength and residual stress of groove-rolled products

Cited by 24 publications

References 2 publications

Estimation of the residual stress on the thread root generated by thread rolling process

Estimation of the residual stress on the thread root generated by thread rolling process

Predicting plastic deformation and work hardening during V-band formation

The importance of forming parameters on rolling process and the performances of component in forming long threads

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