Analysis of fatigue crack growth in cylinder head bolts of gasoline engine based on experimental data

Aliakbari, Karim; Mamaghani, Tohid Akbarpour

doi:10.1007/s40430-020-02326-1

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…The effect of crack depth ratios and aspect ratios on SIFs was taken into consideration. Recently, Aliakbari and Mamaghani [ 28 ] studied the SIFs of the cylinder head bolts of a four-cylinder gasoline engine imposed by premature failure. The SIF on the short crack length was confirmed to be much more important than the SIF in longer cracks, while the crack existence to a depth of 0.35 mm was the failure source of premature fracture.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Shi

Zhou²,

You

et al. 2023

Materials

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Bolted spherical joints, due to their prominent merits in installation, have been widely used in modern spatial structures. Despite significant research, there is a lack of understanding of their flexural fracture behaviour, which is important for the catastrophe prevention of the whole structure. Given the recent development to fill this knowledge gap, it is the objective of this paper to experimentally investigate the flexural bending capacity of the overall fracture section featured by a heightened neutral axis and fracture behaviour related to variable crack depth in screw threads. Accordingly, two full-scale bolted spherical joints with different bolt diameters were evaluated under three-point bending. The fracture behaviour of bolted spherical joints is first revealed with respect to typical stress distribution and fracture mode. A new theoretical flexural bending capacity expression for the fracture section with a heightened neutral axis is proposed and validated. A numerical model is then developed to estimate the stress amplification and stress intensity factors related to the crack opening (mode-I) fracture for the screw threads of these joints. The model is validated against the theoretical solutions of the thread-tooth-root model. The maximum stress of the screw thread is shown to take place at the same location as the test bolted sphere, while its magnitude can be greatly reduced with an increased thread root radius and flank angle. Finally, different design variants related to threads that have influences on the SIFs are compared, and the moderate steepness of the flank thread has been found to be efficient in reducing the joint fracture. The research findings could thus be beneficial for further improving the fracture resistance of bolted spherical joints.

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Section: Introductionmentioning

confidence: 99%

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Shi

Zhou²,

You

et al. 2023

Materials

View full text Add to dashboard Cite

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“…Xing et al [19] investigated the stability of the tunnels under different in situ lateral stress ratios by estimating the rock mass properties using the Hoek-Brown equation. Moreover, K. Aliakbari et al [20,21] used a numerical method. In the process of tunneling using TBM, the mucking speed of the rock and soil in front of the face largely determines the advance rate of the machine because the accumulation of the rock and soil could cause a drop in the tunneling speed or even the capture of TBM.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparison Study of the Radial and Non-Radial Support Schemes in the Deep Coal Mine Roadways under TBM Excavation by the 3-D Equivalent Continuum Approach

Ding

Gao

et al. 2022

Applied Sciences

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In recent years, TBM has been widely applied in deep coal mining to lift the TBM tunneling efficiency and avoid accidents, and more flexible support schemes are expected and required. This research aims to evaluate the performance of the two different support schemes and to study the law of the support effect. A three-dimensional continuum model was established based on the available geological information, and the support effect at the three-dimensional level was studied by changing the support spacing and was assessed in term of the stress, displacement, failure zone, bolt force distributions, and axial deformation behavior of the tunnel. The results show that no matter what the geological condition was, the support of the non-radial support was a little lower than that of the radial support, and with a worse geological condition, the non-radial support had a better performance in the stabilizing tunnel. Additionally, the law of the support effect was found. The interlapping of the support influence domain was the essence of the increase in the support effect. Finally, according to the support law, the appropriate support spacing is found, which is smaller than 50% of the support influence domain length.

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“…In order to analyze the fatigue failure of the cylinder head, some other researchers [15][16][17][18] focused on numerical simulation methods. However, in practical engineering problems, the simulation of cylinder head fatigue life needs a long calculation time.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction analysis of high-intensity marine diesel engine cylinder head based on fast thermal fluid solid coupling method

Zhang

Cui

Liang

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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Due to the complex structures and severe working conditions, including the erosion of high-temperature gas and alternating combustion pressure, the thermal-mechanical fatigue is more likely to occur on the loading surface, which will also have serious impacts on the reliability of marine diesel engine. Herein, based on the three-dimensional fluid-solid coupling analysis, a highly effective four-zone heat transfer model is proposed for analyzing the rules of fatigue life of a new-type high power density diesel engine cylinder head, which can greatly simplify the calculation process of thermal fluid-solid coupling and improve the analysis efficiency by 95%. The accuracy of the model is verified by the temperature field test (with the maximum error of 5.6%) and mechanical fatigue test (with the maximum error of 4.1%). The influence law of operating conditions such as in-cylinder pressure and temperature on high cycle fatigue (HCF) and low cycle fatigue (LCF) life is analyzed. Therefore, the generalized Eying model is obtained, which can establish a direct relationship among the cylinder head fatigue life, average gas temperature as well as maximum combustion pressure, potentially providing the reliability evaluation and optimization design for the diesel engine. KeywordsMarine diesel engine • Cylinder head • Heat transfer boundary • Fatigue life • Reliability T w Temperature of wall. [K] y i Dimensionless heat transfer coefficient. [-] Mean effective roughness. [µm]* Yi Cui

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Analysis of fatigue crack growth in cylinder head bolts of gasoline engine based on experimental data

Cited by 15 publications

References 32 publications

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

A Comparison Study of the Radial and Non-Radial Support Schemes in the Deep Coal Mine Roadways under TBM Excavation by the 3-D Equivalent Continuum Approach

Fatigue life prediction analysis of high-intensity marine diesel engine cylinder head based on fast thermal fluid solid coupling method

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