Effect of Washer Size and Tightening Torque on Bearing Performance of Basalt Fiber Composite Bolted Joints

AbstractMechanical properties of fiber reinforcement that can be obtained by the introduction of basalt fibers in jute fiber-reinforced polyester composites have been analyzed experimentally. Basalt/jute fiber-reinforced hybrid polymer composites were fabricated with a varying fiber percentage by using compression molding techniques. The fabricated composite plates were subjected to mechanical testing to estimate tensile strength, flexural strength and impact strength of the composites. The effect of fiber content on basalt/jute fiber in the composites has been studied. Addition of jute fiber into basalt fiber composite makes it a cost-effective one. Incorporation of basalt fiber into the composites was at approximately 10%, 20%, up to 90%, and the jute fiber percentage was reduced from 90%, 80%, to 10% correspondingly. Mechanical properties were investigated as per ASTM standards. Tensile and flexural strengths were tested by using a computer-assisted universal testing machine, and impact strength by using an Izod impact tester. It has been observed that the addition of jute fiber to the basalt fiber polyester composites enhanced the mechanical properties. Water absorption of hybrid composites was also analyzed and was found to be proportional to fiber percentage.

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Effect of washer size and tightening torque on the performance of bolted joints in composite structures

Composite Structures ◽

10.1016/j.compstruct.2005.02.004 ◽

2006 ◽

Vol 73 (3) ◽

pp. 310-317 ◽

Cited By ~ 93

Author(s):

U.A. Khashaba ◽

H.E.M. Sallam ◽

A.E. Al-Shorbagy ◽

M.A. Seif

Keyword(s):

Composite Structures ◽

Bolted Joints ◽

Tightening Torque

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Parametric Investigation in Pulsed Nd:YAG Laser Cutting of Kevlar-Basalt Fiber Composite

Lasers in Manufacturing and Materials Processing ◽

10.1007/s40516-020-00125-z ◽

2020 ◽

Vol 7 (4) ◽

pp. 373-398

Author(s):

Girish Dutt Gautam ◽

Dhananjay R. Mishra

Keyword(s):

Nd:Yag Laser ◽

Laser Cutting ◽

Fiber Composite ◽

Basalt Fiber ◽

Pulsed Nd:Yag Laser ◽

Parametric Investigation

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Dynamic Characteristics of Plastic Plates With Bolted Joints

Journal of Vibration and Acoustics ◽

10.1115/1.4044865 ◽

2019 ◽

Vol 142 (1) ◽

Author(s):

Akira Saito ◽

Hideyoshi Suzuki

Keyword(s):

Dynamic Characteristics ◽

Vibration Mode ◽

Acrylonitrile Butadiene Styrene ◽

Bolted Joints ◽

Modal Testing ◽

Analytical Models ◽

Plate Motion ◽

Tightening Torque ◽

Modeling Strategy ◽

Torque Values

Abstract This paper discusses the dynamic characteristics of plastic plates with bolted joints. The effects of tightening torque on the modal properties of the plates are investigated. Experimental and numerical modal analyses have been conducted on the plates made of acrylonitrile butadiene styrene (ABS), that are clamped by bolted joints. First, the effect of tightening torque on the vibration mode of the plates is investigated by experimental modal analyses. Modal testing has been conducted for various tightening torque values, and the relationships between the modal parameters and the tightening torques are discussed. Second, the effects of tightening torque on the vibration mode are studied by using analytical models for the bolted joints based on the finite element method (FEM). Based on the comparisons between the experimental and the numerical results, a modeling strategy for the boundary conditions between the plates is introduced and its validity is discussed. From both experimental and numerical studies, it is shown that the natural frequencies of the structures with bolted joints tend to converge to specific values as tightening torque increases. Moreover, it is also shown that when modeling the bolted plates by FEM, the inter-plate motion should be constrained by a boundary condition to properly suppress the out-of-phase motion of the plates.

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Improvement of Axial Tension Distribution of Bolted Joints Tightened by Calibrated Wrench Method From Viewpoint of Quality and Process Control Using Elliptical Confidence Limit

Volume 2A: Advanced Manufacturing ◽

10.1115/imece2019-10524 ◽

2019 ◽

Author(s):

Soichi Hareyama ◽

Ken-ichi Manabe ◽

Satoshi Kobayashi

Keyword(s):

Process Control ◽

Statistical Method ◽

Confidence Limit ◽

Bolted Joints ◽

Independent Random Variables ◽

Tension Stress ◽

Bolted Joint ◽

Tightening Torque ◽

Tension Distribution ◽

Axial Tension

Abstract When tightening a large number of bolted joints, the calibrated wrench method is used. Since this method is indirect, the axial tension varies greatly in many cases. However, the calibrated wrench method is still widely used because of the simplicity of the tool and easy standardization. When the tightening torque and axial tension are considered to be two independent random variables, the axial tension (stress) is distributed within an elliptical confidence limit. Conventionally, it is thought that the shape of this distribution is a rhombus. Considering the permitted limit for a working load (stress) on a bolted joint, the elliptical variation has a larger margin to the yield point than that of a conventional rhombus. On the basis of this feature, we show in this paper that a higher tightening target torque and a higher axial tension can be set than before. By applying the elliptical confidence limit, one can obtain higher tightening torque and initial axial tension than the conventional values within a smaller range of variations. In this study, in the case of tightening a large number of bolted joints at factories and so forth, tightening reliability is considered as a problem associated with quality or process control and a probabilistic statistical method is investigated. Finally, we carry out analysis to establish the optimum tightening torque for bolted joints.

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Study on the flexure performance of fine concrete sheets reinforced with textile and short fiber composites

MATEC Web of Conferences ◽

10.1051/matecconf/201927502006 ◽

2019 ◽

Vol 275 ◽

pp. 02006

Author(s):

Qiao-chu Yang ◽

Qin Zhang ◽

Su-su Gong ◽

San-ya Li

Keyword(s):

Glass Fiber ◽

Fiber Composite ◽

Basalt Fiber ◽

Fiber Composites ◽

Short Fiber ◽

Calcium Carbonate Whisker ◽

Flexural Tests ◽

Short Fiber Composite ◽

Fiber Mesh ◽

Concrete Matrix

In order to study the influences of the contents of short fiber on the mechanical properties of concrete matrix, the properties of compressive, flexure and splitting of concrete matrix reinforced by alkali resistant glass fiber and calcium carbonate whisker were tested. To study the reinforced effect of different scale fibers on the flexure behavior of fine concrete sheets, the flexural tests of concrete sheet of fine concrete reinforced with basalt fiber mesh and short fiber composites were carried out. The results show that the properties of the compressive, flexure and splitting of fine concrete reinforced with appropriate amount of alkali resistant glass fiber and carbonate whisker are improved compared with that of concrete reinforced by one type of fiber. The flexure properties of the concrete sheets are improved obviously when continuous fiber textile and short fiber composite are adopted to reinforce.

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Studies on Mechanical Behaviour of Basalt Fiber Composite

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/377/1/012119 ◽

2018 ◽

Vol 377 ◽

pp. 012119 ◽

Cited By ~ 4

Author(s):

B. Vijaya Ramnath ◽

C. Elanchezhian ◽

J. Aravind ◽

L. Sushil ◽

A. Arun Kumar

Keyword(s):

Mechanical Behaviour ◽

Fiber Composite ◽

Basalt Fiber

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Effect of Polyurethane Surface Treatment on Basalt Fiber Composite

Volume 9: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2013-63512 ◽

2013 ◽

Author(s):

Ting Yang ◽

Mengyuan Liao ◽

Zhenjin Cui ◽

Yuqiu Yang

Keyword(s):

Surface Treatment ◽

Chemical Resistance ◽

Fiber Composite ◽

Low Cost ◽

Basalt Fiber ◽

Woven Fabric ◽

Mechanical And Thermal Properties ◽

Composite Field ◽

Reinforced Fiber ◽

Comparison And Analysis

Nowadays, Basalt fiber is obtained increasing attention worldwide as a kind of promising reinforced fiber in composite field, which has the excellent mechanical properties, chemical resistance, comparative low cost, easily processing and abundance resource. In this paper, polyurethane dispersion (PUD) was employed as the surface treatment for the basalt fiber-woven fabric. Basalt woven fabric was washed by acetone solution following by different pick-up ratio PUD treating. Treated BFRP and virgin one were tested by tensile test with AE equipment, comparison and analysis have been carried out in order to discuss the change of mechanical property by changing the PUD treatment’s pick-up ratio and improved mechanical and thermal properties compared with virgin one.

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ESTIMATIVE OFCORRELATIONS BETWEEN TIGHTENING TORQUE AND ASSEMBLY FORCE OF BOLTED JOINTS THROUGH MEASUREMENTS AND COMPUTATIONAL SIMULATIONS

10.5151/simea2018-pap06 ◽

2018 ◽

Author(s):

João G. Farias ◽

Alex Pizzatto ◽

Vitor Shimada ◽

Thiago Zanotto ◽

Rodrigo Pedroso ◽

...

Keyword(s):

Bolted Joints ◽

Computational Simulations ◽

Tightening Torque

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Identification of Pre-Tightening Torque Dependent Parameters for Empirical Modeling of Bolted Joints

Applied Sciences ◽

10.3390/app11199134 ◽

2021 ◽

Vol 11 (19) ◽

pp. 9134

Author(s):

Yu Tian ◽

Hui Qian ◽

Zhifu Cao ◽

Dahai Zhang ◽

Dong Jiang

Keyword(s):

Experimental Data ◽

Thin Layer ◽

Empirical Equation ◽

Model Updating ◽

Bolted Joints ◽

Empirical Modeling ◽

Bolted Joint ◽

Tightening Torque ◽

Torque Wrench ◽

Interface Parameters

The vibration characteristics of bolted structures are crucially affected by the pre-tightening torque. An approach for identifying the pre-tightening torque dependent stiffness parameters of bolted joints is proposed in this paper. Firstly, the interface of the bolted joint is characterized by the thin layer element with the isotropic material property, and the parameter value of the property is assigned relative to the distance from the center of the bolt; the influence of the bolt is ignored. Secondly, the model updating method is adopted to identify the parameters of thin layer elements using experimental data, and modal data under different values of pre-tightening torque in the range of 2 N·m~22 N·m are obtained; the torque wrench is used to determine the pre-tightening torque in the modal test. Finally, after identifying the material parameters using partial experimental data on pre-tightening torque range, the empirical equation of the interface parameters with the pre-tightening torque parameter is obtained by curve fitting and the rest of the experimental data are used to verify the accuracy of the fitted empirical equations. It is concluded that this method can obtain all the parameters of the equivalent thin layer elements within a certain range of pre-tightening torque, which can provide a reference for the empirical modeling of bolted structures, improve modeling efficiency and reflect the characteristic performance of real structural dynamics.

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