Mechanics and modelling of high-frequency mechanical impact and its effect on fatigue

Quilliec, Guénhaël Le; Lieurade, H. P.; Bousseau, Marc; Drissi‐Habti, Monssef; Inglebert, G.; Macquet, Pascal; Jubin, Laurent

doi:10.1007/s40194-012-0013-3

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…The effectiveness of HFMI treatments to improve the fatigue strength of welded details has been proven in many recent experimental and analytical studies (e.g. [9][10][11][12][13][14][15]). These studies have investigated the use of HFMI treatments for application to both existing fatigue deficient weld details and new high-strength steel structures.…”

Section: Introductionmentioning

confidence: 99%

Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

et al. 2014

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The idea of using 3D point clouds obtained with the aid of a handheld 3D laser scanner for the quality assurance of high-frequency mechanical impact (HFMI) treatment is proposed and demonstrated in this paper. The effectiveness of impact treatments for extending the fatigue lives of welded structures has been demonstrated in numerous studies. Guidelines for the proper execution of impact treatments have been developed. A lack of suitable quality assurance (QA) procedures for accepting or rejecting the treatment after completion has been previously identified. In contrast with the existing QA procedures, which are based mainly on controlling inputs and visual inspection, a technology-based, quantitative methodology is developed in this paper. Five welded specimens were subjected to impact treatment at various levels to simulate under-, proper, and over-treatment. A handheld 3D laser scanner was then used to facilitate a point cloud-based method to determine the geometric parameters of the treated weld toe groove, which were then measured manually. The results show that the proposed methodology is successful in identifying the different treatment levels. This approach has a number of advantages over the existing QA methods, including the following: providing quantitative measures, ease of use, and archive-ability.

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Section: Introductionmentioning

confidence: 99%

Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

et al. 2014

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“…Flaking type damage can also be observed in cases of high coverage rates, i.e. two passes or low-speed [20]. -The quantitative measures are directly measurable, such as the indentation depth and groove width, where the indentation depth has proved to be an excellent measure for quality assurance.…”

Section: Developed Algorithm For Post-weld Treatment Quality Inspectionmentioning

confidence: 99%

Development of an Automated System for Adaptive Post-Weld Treatment and Quality Inspection of Linear Welds

Mikkelstrup¹,

Kristiansen²,

Kristiansen³

2021

Preprint

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High-frequency mechanical impact (HFMI) treatment is a well-documented post-weld treatment to improve the fatigue life of welds. Treatment of the weld toe must be performed by a skilled operator due to the curved and inconsistent nature of the weld toe to ensure an acceptable quality. However, the process is characterised by noise and vibrations; hence, manual treatment should be avoided for extended periods of time. This work proposes an automated system for applying robotised 3D scanning to perform post-weld treatment and quality inspection of linear welds. A 3D scan of the weld is applied to locally determine the gradient and curvature across the weld surface to locate the weld toe. Based on the weld toe position, an adaptive robotic treatment trajectory is generated that accurately follows the curvature of the weld toe and adapts tool orientation to the weld profile. The 3D scan is reiterated after the treatment, and the surface gradient and curvature are further applied to extract the quantitative measures of the treatment, such as groove radius, weld toe deviation, and indentation depth and width. The adaptive robotic treatment is compared experimentally to manual and linear robotic treatment. This is done by treating 600 mm weld toe of each treatment type and evaluating the quantitative measures using the developed system. The results showed that the developed system reduced the overall treatment variance by respectively 26.6 % and 31.9 %. Additionally, a mean weld toe deviation of 0.09 mm was achieved; thus, improving process stability yet minimising human involvement.

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“…Figure 4. A significant increase in fatigue life could be determined [2][3][4][5][6][7][8][9][10][11][12][13][14]. For a better comparison the inverse slope m and the FAT value at 2Á10 6 cycles for a failure probability of 50 % according to the equation…”

Section: As-welded Hfmi-treated Predictedmentioning

confidence: 99%

“…The advantages of removing the potential threats of unwanted (tensile) residual stresses and exploiting the beneficial (compressive) residual stresses by mechanical treatments are already known in welding communities. In this context, high frequency hammer peening as post weld treatment is a statistically proven method to increase the fatigue life of welded joints [2][3][4][5][6][7][8][9][10][11][12][13]. During this process, a hardened cylindrical metal pin with a spherical tip impacts the weld toe surface with high frequency and induces local plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

Schubnell

Farajian

Däuwel

et al. 2018

Materialwissenschaft Werkst

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After post weld treatment with high frequency mechanical impact (HFMI) treatment of welds, a significant increase of fatigue life (up to a factor of 10) can be achieved. During the last years numerous experimental tests of welded joints with simple geometry under constant amplitude loading have been performed to quantify the positive effect of high frequency mechanical impact treatment. Due to the lack of methods for the prediction of the high frequency mechanical impact benefits, a widespread use of this process is not the case yet. Furthermore, it is still not clear if the results of these fatigue tests can be transferred to complex geometries and complex loading conditions such as in industrial applications. Therefore, an approach to assess the fatigue life of complex welded structures under variable amplitude loading was developed. For this purpose, high frequency mechanical impact treatment and fatigue load of simple welded specimen made of S690QL steel were simulated with finite element analysis (FEA) firstly. Then, the needed damage parameters for the fatigue life correlation were evaluated from the finite element postprocessing. The calculated life time to crack initiation was in good agreement with the experimental fatigue test results. In the next step, this procedure was implemented on a welded arm of an evacuator of type EW180B of the company Volvo Construction Equipment made of S700MC. The variable amplitude load measured under real service condition was transferred to single constant amplitude load cycles using a rainflow-counting algorithm. By simulation and damage mechanics evaluation of each load cycle the total damage sum could be calculated and compared with the experimental results from Volvo Construction Equipment.Keywords: Fatigue / welding / residual stresses / high frequency mechanical impact (HFMI) / finite element analysis (FEA) Nach einer Schweißnahtnachbehandlung mittels Hochfrequenzhämmern (engl. high frequency mechanical impact treatment (HFMI)) kann eine signifikante Lebensdauerverlängerung des Bauteils (bis zu einem 10-fachen) festgestellt werden. Während der letzten Jahre wurde dieser positive Effekt vielfach experimentell mit einfachen Proben-

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Mechanics and modelling of high-frequency mechanical impact and its effect on fatigue

Cited by 18 publications

References 8 publications

Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

Development of an Automated System for Adaptive Post-Weld Treatment and Quality Inspection of Linear Welds

Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

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