The Effect of Helix on the Nonlinear Analysis of Threaded Connection

Sun, Yu; Liao, Ri Dong

doi:10.4028/www.scientific.net/amr.148-149.1741

Cited by 3 publications

(6 citation statements)

References 6 publications

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Section: Simulations and Experimental Testsmentioning

confidence: 99%

“…Developing a discrete microstructure in the form of a microscopic numerical model is not an easy task, but in some cases can be of crucial importance. An example of such an approach in reality is presented by the authors of the analysis involving the numerical tests of braking system elements [18,21]. The material used to construct the shank of the filter with the studied thread is the Ti8Al1Mo1V titanium alloy with the short-term strength of 937 MPa, yield point of 910 MPa and Young's modulus of 120 GPa.…”

Section: Simulations and Experimental Testsmentioning

confidence: 99%

“…This publication presents detailed results of the numerical and experimental tests involving a shank with a thread and cooperating nut, which are the elements of an aircraft fuel system assembly ( Figure 2). The various aspects of numerical analyses of threaded connection are approached in scientific research [18][19][20][21][22]. Whereas the authors have not encountered a strength analysis of a threaded connection with modelled operational wear and tear in the source literature.…”

Section: Introductionmentioning

confidence: 99%

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The Study of Aircraft Accidents Causes by Computer Simulations

et al. 2020

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Defects in an aircraft can be caused by design flaw, manufacturer flaw or wear and tear from use. Although inspections are performed on the airplane before and after flights, accidents still result from faulty equipment and malfunctioning components. Determining the causes of an aircraft accident is an outcome of a very laborious and often very long investigation process. According to the statistics, currently the human factor has the biggest share within the causal groups. Along with the development of aviation technology came a decline in the number of accidents caused by failures or malfunctions, though such still happen, especially considering aging aircraft. Discovering causes and factors behind an aircraft accident is of crucial significance from the perspective of improving aircraft operational safety. Effective prevention is the basic measure of raising the aircraft reliability level, and the safety-related guidelines must be developed based on verified facts, reliable analysis and logical conclusions. This article presents simulation tests carried out by finite element method and constitutive laboratory tests leading to the explanation of the direct cause of a military aircraft accident. Computer-based simulation methods are particularly useful when it comes to analysing the kinematics of mechanisms and potential stress concentration points. Using computer models enables analysing an individual element failure process, identifying their sequence and locating their primary failure source.

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Section: Simulations and Experimental Testsmentioning

confidence: 99%

Section: Simulations and Experimental Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Study of Aircraft Accidents Causes by Computer Simulations

et al. 2020

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“…Some researchers have used simple axisymmetric models to determine and understand aspects like load and stress distribution between mating threads [5][6][7]. Few studies have created three dimensional finite element models of threaded sections accounting for the helix angle [8][9][10] by rotating a section of the axisymmetric thread about a helix. These studies provided valuable information about the stress distribution on the threads due to axial loading only.…”

Section: Introductionmentioning

confidence: 99%

“…The FEA models used in Refs. [5][6][7][8][9][10][11][12][13][14][15] This paper uses three dimensional finite element analyses to investigate the effect of underhead wedge angle on the torquetension relationship of bolted joints. Results considering a nonparallel under the bolt head are compared to those with parallel contact surfaces.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Process Control for Bolt Tightening in Joints With Nonparallel Contact

Ganeshmurthy

Nassar

2014

Journal of Manufacturing Science and Engineering

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In this paper, 3D finite element analysis (FFA) is used to simulate and evaluate different process control methods that are commonly used for automating the assembly of bolted joints in a mass production environment. The finite element (FF) model takes into account the thread helix angle of a fastener along with parallel and nonparallel contact surfaces under the bolt head. Simulation includes the torque-only and the torque-turn process control methods for achieving a desired level of the bolt preload at initial assembly of the joint. The torque-only process control option is simulated by applying the target torque at which the tightening process is automatically stopped. On the other hand, a torque-turn or torque-angle method is simulated by first applying a low level (threshold) torque, to the bolt head, followed by turning the bolt head by a specified angle of turn in order to achieve the desired bolt tension. The effect of variables such as thread and underhead bearing friction coefficients and bolt hole clearance is investigated. The FEA simulation provided in this study would be helpful in developing a reliable tightening strategy for joints with nonparallel bearing surfaces.

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A numerical investigation into stripping failure of bolt assemblies at elevated temperatures

et al. 2020

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A detailed finite element (FE) study is presented investigating the factors affecting the failure modes of high strength and stainless steel bolt assemblies under tensile force at ambient and elevated temperatures. Axisymmetric FE models incorporating key behavioural aspects including surface interaction and damage modelling of steel at elevated temperatures were developed. In practice, stripping failure is generally undesired because it results in premature failure of the bolt which can deteriorate rotational capacity of connections and hence compromise the robustness of steel frames. Yet, stripping failure has not been previously investigated in the open literature. In this study, the examined stainless steel bolt assemblies displayed an outstanding ductile response even when stripping failure was observed. Parameters that can govern the failure modes of bolt assemblies at elevated temperatures include the thread length in the grip (L t ), and the relative strength and friction between the mating threads. At ambient temperature, stripping was observed at certain L t lengths depending on the nut dimension deviation from the basic profile. The L t stripping failure threshold reduces with temperature for high strength bolt assemblies while the value fluctuates without a discernible pattern for stainless steel types. Increasing the relative strength and friction coefficient can reduce the L t length threshold, with the former having the greatest influence.

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The Effect of Helix on the Nonlinear Analysis of Threaded Connection

Cited by 3 publications

References 6 publications

The Study of Aircraft Accidents Causes by Computer Simulations

The Study of Aircraft Accidents Causes by Computer Simulations

Finite Element Simulation of Process Control for Bolt Tightening in Joints With Nonparallel Contact

A numerical investigation into stripping failure of bolt assemblies at elevated temperatures

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