Bearing failure and influence factors analysis of metal-to-composite bolted joints at high temperature

Abdus, Salam; Cheng, Xiaoquan; Huang, Wenjun; Ahmed, Altaf; Hu, Renwei

doi:10.1007/s40430-019-1797-5

Cited by 8 publications

(6 citation statements)

References 26 publications

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Section: Peak Stress and Strainmentioning

confidence: 99%

“…As shown in Figure 9, Sr was always less than 1.0 under all VTC conditions, which means that the mechanical strength of grouting material in high-geothermal environments decreased to different degrees compared to normal conditions. That is why some engineering problems like failures in advanced pipe grouting or anchorage systems usually occur a long time after construction in high-geothermal tunnels [28][29][30]. According to the relative peak strength, values of Sr under the conditions of different curing factors were obtained, and the higher the temperature, the lower the relative humidity, the more the compressive strength of grouting material declined.…”

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confidence: 99%

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Mechanical Characteristics of Cement-Based Grouting Material in High-Geothermal Tunnel

Wang

Jiang

et al. 2020

Materials

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The cement-based grouting materials used for practical purposes in high-geothermal tunnels are inevitably affected by humidity and high temperature, leading to the deterioration of mechanical properties. Based on the characteristics of changing high temperatures and two typical conditions of hot-humid and hot-dry environments in high-geothermal tunnels, many mechanical strength tests were carried out on the grouting material cured under different environmental conditions. The study results indicated that high temperature and low relative humidity were unfavorable to the development of mechanical characteristics of grouting material, but the coupling effect of two factors could improve the strength at early ages and reduce the degradation of long-term strength. As the curing temperature exceeded 56.3 °C, the humidity effect on strength played a more important role in recovering the strength of grouting material damaged by high temperature. Temperature had more significant impact on the relative peak stress while the relative humidity had greater influence on the relative peak strain. A calculation compressive constitutive model was prospered, which considering both temperature and relative humidity. The study results may provide much valuable experimental data and theoretical supporting for the design of compression constitutive of cement-based grouting material in high-geothermal tunnel.

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Section: Peak Stress and Strainmentioning

confidence: 99%

mentioning

confidence: 99%

Mechanical Characteristics of Cement-Based Grouting Material in High-Geothermal Tunnel

Wang

Jiang

et al. 2020

Materials

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“…In mechanical assembly process, heating by oven and cooling by liquid nitrogen are common ways to realize the bearing heat bilges cold shrink in order to make the bearing ring satisfy the requirement of the interference fit assembly. As the heating of the bearing ring is not very accurate in practical engineering, we can only know that the heating temperature is generally within the range of 70-220 °C, and the heating process is generally within 20 min [35][36][37], and there are uneven heating conditions. For the heating phenomenon caused by the failure of other parts of the mechanical structure, there is also a large temperature range.…”

Section: Experiments Systemmentioning

confidence: 99%

Effect of grease on bearing vibration performance caused by short-time high-temperature exposure

Xiong

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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A short-time high-temperature environment is a common working condition in the use of bearings; it can occur as rapid heating before interference assembly of a bearing, or in a quick shutdown due to failure and heating of other parts of equipment. However, the current research mainly focuses on the influence of long-term high temperatures on bearing lubrication. In this paper, the 6204DDU ball bearing with lithium soap/mineral oil (paraffin base type) grease and fatty acid soap/mineral oil (refined white oil) grease (white grease) is investigated. The recovery performance of the two greases after a short-time high temperature is studied. It is found that a large number of fractures occur in the soap fibre of the white grease after 20 min exposure in 140 °C temperature environments, while lithium grease remains in a good working condition. The vibration velocity with white grease decreases during a temperature falls from 110 °C to the heated balanced temperature, while the vibration velocities with lithium grease is without significant fluctuations. Before and after heating, the vibration velocities in middle frequency band of rolling bearings with lithium grease and white grease increase with the increase in preload, but it is the opposite in the high frequency band except for white grease after heating condition. Infiltration with a small amount of water or oil can greatly affect the performance of white grease. Water can emulsify the white oil and accelerates the oxidation of white grease. The structure of the L-AN32 oil contaminant is different from that of white oil, resulting in uneven dispersion of saponified crystals and obvious flocculent agglomeration is presented.

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“…Research on the subject has been mostly restricted to limited comparisons of the bolted FRP joints' shear, bearing, and tensile performances. [18][19][20][21] It is well established from previous studies that the drilling process of fastener holes results in various damage formations such as matrix cracking, delamination, and fiber breakage for FRPs. [2,22,23] Moreover, the resulting damage formations can propagate to a more dangerous extent under dynamic loading and seriously weaken the BCJs' damage tolerance and reliability.…”

Section: Introductionmentioning

confidence: 99%

Assessment of damage tolerance of bolted composite structures via “bearing‐after‐impact” tests

Kaybal

2022

Polymer Composites

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Although bolted composite joints are mainly designed to resist bearing loading, dynamic loading such as low‐velocity impact can also be a severe threat because of its potential to reduce joint reliability. Surprisingly, it is still unclear how bolted composite joints perform after the dynamic loading, and its effect on the damage tolerance is unknown likewise. This study aims to evaluate experimentally the bearing‐after‐impact (BAI) damage tolerance of bolted glass‐fiber (GF) reinforced epoxy composite joints. For this, the GF/epoxy composite laminates were assembled in single‐lap shear joints firstly, and the bolted composite joints were subjected to low‐velocity impact tests at various energy levels from 3 to 10 J. Following that, standardized bearing tests were carried out to determine the damage tolerance of the laminated composites following the impact. Nanoclay fillers were also added to the epoxy matrix to improve damage tolerance. After the low‐velocity impact loading, the bearing strength diminishes by almost 22% for the bolted composite joints, while the reduction in damage tolerance is effectively limited with the nanoclay addition. However, as the impact energy increases, the efficiency of the nanofiller declines. Increased impact energy results in changes in failure modes, and nanofillers improve damage tolerance with additional nano‐scale toughness‐increasing mechanisms.

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Bearing failure and influence factors analysis of metal-to-composite bolted joints at high temperature

Cited by 8 publications

References 26 publications

Mechanical Characteristics of Cement-Based Grouting Material in High-Geothermal Tunnel

Mechanical Characteristics of Cement-Based Grouting Material in High-Geothermal Tunnel

Effect of grease on bearing vibration performance caused by short-time high-temperature exposure

Assessment of damage tolerance of bolted composite structures via “bearing‐after‐impact” tests

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