Experimental study on behavior of time-related preload relaxation for bolted joints subjected to vibration in different directions

Li, Ying; Liu, Zhifeng; Wang, Yuezhen; Cai, Ligang; Zheng, Mingpo

doi:10.1016/j.triboint.2019.106005

Cited by 41 publications

(13 citation statements)

References 28 publications

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“…The conductance peaks shift left and attain a very high value with an increment of damage level for all the frequency range plotted for incipient damage condition. This may cause due to initial loss of contact stiffness in the vehicular system (see Figure 3(b) and (d)) (Li et al, 2020a(Li et al, , 2020bZhang et al, 2017). In a similar fashion, the conductance plots were obtained for damage scenarios C1, C2, C3, and D, shown in Figures 4 and 5.…”

Section: Experimental Set-upsupporting

confidence: 55%

“…It must ensure that the bolts remained tightened and maintain the preload conditions (Huynh et al, 2018). Also, Failure to replace a worn upper strut mount will cause it to deteriorate very quickly, which will have a knock-on effect on other components, such as the shock absorbers and even the tires (Huynh et al 2018;Li et al, 2020aLi et al, , 2020b. Often, fatigue failure results from the self-loosening of the bolt, which reduces the clamping force acting on the joint (Dahil, 2017;Goodarzi and Khajepour, 2017;Wang et al, 2013bWang et al, , 2013c.…”

Section: Introductionmentioning

confidence: 99%

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Piezo impedance-based monitoring of loosening of bolts: Experimental and numerical study

Moharana

Arun

2021

Journal of Intelligent Material Systems and Structures

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The suspension strut mount plays a crucial role in any vehicular suspension system, where it acts as a connector (bolted) to the vehicular body and suspension strut. The mount’s purpose is to cushion the Vehicular impacts and reduce the jarring effect, noise, and vibration caused due to vehicle movement over the undulated roads. The self-loosening of bolts results because of the up and down impact of the spring cause the jounce bouncer to push and pull action at the mount interface, cause vibrations transmitted to the vehicle camber. Self-loosening leads to damage of mount followed by clunking noises, noisy steering, tire misalignment, and can cause discomfort to the passenger. Therefore, condition monitoring and assessment of an upper strut mount is necessary for vehicles. This paper studies the feasibility of the piezo Impedance-based Structural health monitoring (SHM) technique to monitor the self-loosening bolts in the upper strut mount of the suspension system (MacPherson strut suspension) of passenger car. The piezo coupled signatures were obtained experimentally by loosening all the three bolts (connected to strut bearing) through control torques through a digital torque wrench. All the experimental signatures were acquired with a single PZT patch bonded to the surface of the upper strut mount for loosening bolts with pre-tight loss. Progressive damage scenarios are simulated along with preload loss of either single bolt or all three bolts, respectively. Three different statistical damage indices were evaluated for damage quantification raised due to bolt loosening. A 3D numerical modeling of strut mount is done using ANSYS WORKBENCH, and piezo impedance signatures were acquired (hence converted to admittance) for validating the experimental signatures. In an overall, this study provides an insight into the loss of structural integrity due to the self-loosening of suspension bolts, which can be threatful to vehicular integrity.

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Section: Experimental Set-upsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Piezo impedance-based monitoring of loosening of bolts: Experimental and numerical study

Moharana

Arun

2021

Journal of Intelligent Material Systems and Structures

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“…Figure 1 shows the changes in the lactic acid-load curve when the riding load is in the 2nd to 7th grades in the 3 GXT before and after the two-stage training of the CG and DG groups. 6 After the first stage of NT, the lactic acid-load curve in GXT of the two experimental groups did not shift to the right, on the contrary, the BLa of the CG group increased when riding 130W, 170W, 210W and 330W (increase by 12.5%, 30.4%, 17.2% and 10.7% respectively); After the second stage of SIT, the lactic acid-load curve in the GXT of the two experimental groups shifted significantly to the right, among them, the DG group moved more to the right in the 170W~290W area, and BLa decreased by 32%, 30%, 21.1%, and 16.4% at the 4 time points, respectively.…”

Section: Aerobic Capacitymentioning

confidence: 99%

Effect of Different Interval Speed Training on Athlete Reaction

Chen

2022

Rev Bras Med Esporte

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Introduction: High-intensity Intermittent Training (HIIT) ranked first in the ACSM “2013 Global Training Methodology Survey”. Objective: To explore the influence of different speed training intervals on athlete reaction speed. Methods: Sixteen male bicycle athletes were randomly divided into two groups. The two groups then completed a six-week training routine (NT). The two groups then completed a six-week training routine , started 6 weeks of Sprint Interval Training (SIT) (a total of 12 lessons), with SIT instead of Normal Training (NT) live endurance training, and another training remains unchanged. Results: After 6 weeks of NT, Pmax GXT in the CG and DG groups decreased by 0.7% and 1.7%, respectively,as compared to the pre-training numbers. The difference was not statistically significant (P>0.05). And after 6 weeks of SIT, Pmax GXT increased significantly (P<0.05) in both experimental groupss,with increases of 9.2% and 10.2% for the CG and DG groups, respectively. Conclusions: The results show that intermittent training can effectively improve the aerobic metabolism of short-haul cyclists. As the power bicycle load and the training intensity and volume of the deceleration intermittent training program increase, the more significant the changes in aerobic capacity that can result in adaptability. Level of evidence II; Therapeutic studies - investigation of treatment results.

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“…For the support surface, the distribution of frictional force is more complicated, and the equivalent frictional diameter of the load bearing surface is obtained by the equivalent resistance torque method. 23 Equivalent resistance torque can be expressed as follows:…”

Section: Theoretical Relationship Between Tightening Torque and Preloadmentioning

confidence: 99%

Research on bolt pre-tightening and relaxation mechanism under transverse load

Gao

Gong

Tian

et al. 2014

Advances in Mechanical Engineering

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In order to predict the bolt’s stress distribution under the pre-tightening state and the loosening process under the transverse load, a 3D model considering the bolt thread structure was established by finite element method (FEM). In this study, the looseness effect of transverse load amplitude, the friction coefficient of the bolt head load bearing surface and the thread contact surface are mainly studied. The result indicated that the stress under bolt pre-tightening is mainly concentrated on the contact part of the bolt’s head and bar. At the contact area of the load threads at one end and the transition part between the bolt bar and the thread, the stress and axial direction of the thread part are offset. Under the transverse displacement load, the sliding of the bolt can be divided into three stages: full contact, viscous contact, and full slip. The numerical model of bolt relaxation obtained in this paper can provide reference for the application, checking and prediction of threaded fasteners.

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Experimental study on behavior of time-related preload relaxation for bolted joints subjected to vibration in different directions

Cited by 41 publications

References 28 publications

Piezo impedance-based monitoring of loosening of bolts: Experimental and numerical study

Piezo impedance-based monitoring of loosening of bolts: Experimental and numerical study

Effect of Different Interval Speed Training on Athlete Reaction

Research on bolt pre-tightening and relaxation mechanism under transverse load

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