Finite element modeling of the contact of elements preloaded with a bolt and externally loaded with any force

Grzejda, Rafał

doi:10.1016/j.cam.2021.113534

Cited by 22 publications

(14 citation statements)

References 35 publications

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“…The normal force generates the contact pressure which causes surface stresses [ 46 , 47 ]. These, in turn, can cause deformations, including plastic ones [ 48 ]. If the surfaces move in relation to each other, fragments of the material may be “torn” from them—this is called adhesive wear.…”

Section: Resultsmentioning

confidence: 99%

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Borawski

2022

Materials

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The braking system is one of the most important components in any motor vehicle. Its proper function in emergency situations may save road users’ lives. Today, as vehicles have more and more power at their disposal, leading to increased acceleration and maximum speed, the issue of effective braking is particularly important. It must also be noted that brakes are used in harsh conditions (water and salt, especially during winter), and must provide appropriate durability (on average, circa 30,000 km). For these reasons, many institutions conduct research aimed, among other things, at minimizing fading. However, this study looked into a different matter, focusing on how the operating conditions mentioned above, including the lifespan of brakes, impact the tribological properties of the friction pair. To achieve this, samples from brake pads were obtained (both brand new and used). Next, using a pin-on-disc tribological test, it was shown that the pads have lower coefficients of friction and abrasive wear rates. The results indicated that both parameters change in a manner that is dependent on how long the brake system has been in use.

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Section: Resultsmentioning

confidence: 99%

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Borawski

2022

Materials

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“…In this study, we examined the multi-bolted connection that is presented in Figure 1. The tested connection consisted of two plates (2) and (3), fastened with seven special bolts with a thread profile of M10 × 1.25 (5) and high hexagonal nuts (4). The joined plates (2 and 3) were welded to the upper plate (1) and to the base (6).…”

Section: Bolted Connection and Bolt Calibrationmentioning

confidence: 99%

“…In the case of multi-bolted connections, the presence of two states of load and deformation should be considered. The first is the initial tightening of the connection [ 5 ], and the second concerns the loads and deformations in the exploitation state of the connection. The results of experimental tests of the tightening process of the selected asymmetric multi-bolted connection were described in a previous study [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of an Asymmetric Multi-Bolted Connection under Monotonic Loads

2021

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This article describes the experimental studies of a preloaded asymmetric multi-bolted connection in the exploitation state. The construction of two stands were introduced: for bolt calibration and for evaluating the bolt forces in a multi-bolted connection. The bolts were tightened in a specific optimal sequence, in three passes, monitoring the force values in the bolts using a calibrated strain gauge measuring system. The studies were conducted for the selected multi-bolted connection on an Instron 8850 testing machine. The measurement data were saved in MATLAB R2018b Simulink. The measurement results were analysed statistically and are presented via charts showing the distributions of the normalised values of the bolt forces as a function of the linearly increasing and decreasing exploitation loads. We show that the forces in individual bolts, after unloading the multi-bolted connection, change in relation to the initial values of their preload.

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“…The most important factor during the working equipment exploitation is reliability. Many research works are focused on improvements of commonly used parts, and their connections to the other part of the construction [ 37 , 38 , 39 , 40 , 41 ], however, a significant gap still remains in this field. It is very important to assure a proper schedule of the exact equipment exploitation, service, and diagnostic operations.…”

Section: Introductionmentioning

confidence: 99%

Wear Analysis of Additively Manufactured Slipper-Retainer in the Axial Piston Pump

et al. 2022

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Additive manufacturing (AM) of spare parts is going to become more and more common. In the case of hydraulic solutions, there are also some applications of AM technology related to topological optimization, anti-cavitation improvements, etc. An examination of all available research results shows that authors are using specialized tools and machines to properly prepare AM spare parts. The main aim of this paper is to analyze the influence of quick repair of the damaged slipper-retainer from an axial piston pump by using an AM spare part. Hence, it was prepared with a 100-h test campaign of the AM spare part, which covers the time between damage and supply of the new pump. The material of the slipper-retainer has been identified and replaced by another material—available as a powder for AM, with similar properties as the original. The obtained spare part had been subjected to sandblasting only to simulate extremely rough conditions, directly after the AM process and an analysis of the influence of the high surface roughness of AM part on wear measurements. The whole test campaign has been divided into nine stages. After each stage, microscopic measurements of the pump parts’ surface roughness were made. To determine roughness with proper measurements, a microscopical investigation was conducted. The final results revealed that it is possible to replace parts in hydraulic pumps with the use of AM. The whole test campaign caused a significant increase in the surface roughness of the pump’s original parts, which was worked with the AM spare slipper-retainer: (1) from Ra = 0.54 µm to Ra = 3.84 µm in the case of two tested pistons; (2) from Ra = 0.33 µm to Ra = 1.98 µm in the case of the slipper-retainer. Despite significant increases in the surface roughness of the pump’s parts, the whole test campaign has been successfully finished without any damages to the other important parts of the whole hydraulic test rig.

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Finite element modeling of the contact of elements preloaded with a bolt and externally loaded with any force

Cited by 22 publications

References 35 publications

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Experimental Studies of an Asymmetric Multi-Bolted Connection under Monotonic Loads

Wear Analysis of Additively Manufactured Slipper-Retainer in the Axial Piston Pump

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