scholarly journals A STUDY ON HIGH STRENGTH BOLTED JOINT WITH FILLER PLATES USING METAL-SPRAYED CONTACT SURFACES

2019 ◽  
Vol 75 (3) ◽  
pp. 320-331
Author(s):  
Kuniaki MINAMI ◽  
Hideki YOKOYAMA ◽  
Masamichi SAITO ◽  
Takanori MURAKAMI
Keyword(s):  
High Strength ◽  
Bolted Joint ◽  
Contact Surfaces

EXPERIMENTAL STUDY ON SLIP COEFFICIENT OF HIGH STRENGTH BOLTED JOINT WITH METAL SPRAYED CONTACT SURFACE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yusuke Nakanishi ◽  
Kunitaro Hashimoto ◽  
Yasuo Suzuki ◽  
Kunitomo Sugiura
Keyword(s):  
Steel Structures ◽  
High Strength ◽  
Treatment Method ◽  
Construction Cost ◽  
Bolted Joints ◽  
Maintenance Cost ◽  
Bolted Joint ◽  
Slip Coefficient ◽  
Surface Conditions ◽  
Contact Surfaces

There are several ways to reduce the number of bolts of frictional bolted joints from the viewpoint of the construction cost and the maintenance cost for steel structures. For example, there are the ways which are strengthening the material of bolts, or increasing the slip coefficient. This study is focused on the slip coefficient with metal thermal sprayed contact surfaces. The objective of this study is to investigate the effects of different surface conditions on the slip coefficient. Therefore, slip tests were conducted in consideration of 9 patterns of surface treatment method (3 kinds of thickness, 3 kinds of material of sprayed metal).

scholarly journals BOLT-TIGHTENING TESTS OF HIGH STRENGTH BOLTED JOINT WITH METAL-SPRAYED CONTACT SURFACES

2013 ◽  
Vol 69 (1) ◽  
pp. 133-138
Author(s):  
Kuniaki MINAMI ◽  
Yasuhiko TOKUTOMI ◽  
Orie SHIMIZU ◽  
Kenichi KAWAMURA ◽  
Shigeyuki MORII
Keyword(s):  
High Strength ◽  
Bolted Joint ◽  
Contact Surfaces

Experimental Analysis for the Effect of Impactor Geometry on Carbon Reinforced Composite Materials

2017 ◽  
Vol 25 (9) ◽  
pp. 677-682 ◽  
Author(s):  
Faruk Elaldi ◽  
Busra Baykan ◽  
Can Akto
Keyword(s):  
Composite Materials ◽  
Carbon Fibre ◽  
Composite Plates ◽  
High Strength ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Area ◽  
Reinforced Composite ◽  
Contact Surfaces ◽  
The Impact

For the last three decades, composites have become very preferable materials to be used in the automotive industry, structural parts of aircraft and military systems and spacecraft, due to their high strength and modulus. Composite materials are sometimes exposed to invisible or visible damage due to impact loading during their service life. In this study, the effect of impactor geometry with four different contact surfaces on woven carbon fibre-reinforced composite plates having three different thicknesses are investigated. In the first stage, composite plates were manufactured with the ply orientations of [45/-45/0/90/45/-45]2s, [45/-45/0/90/45/-45]3s, [45/-45/0/90/45/-45]4s based on conventional usage. In the second stage, carbon fibre-reinforced composite test panels were exposed to low velocity impact tests to obtain force-time, energy-time and force-displacement curves. Finally, semi and full penetration of composite panels and damage magnitude were determined. It was found that the impactor geometries with lower contact surfaces such as conical and ogive types were much more penetrative on composite plates than the other geometries, but they caused larger damage area in the vicinity of the impact point.

scholarly journals Modeling and Simulating the Static Structural Response and Lift Off of a Preloaded Bolted Joint on a Flange

Proceedings ◽  
2020 ◽  
Vol 63 (1) ◽  
pp. 10
Author(s):  
Rami Alfattani
Keyword(s):  
Structural Response ◽  
Segment Length ◽  
Bolted Joint ◽  
Element Analysis ◽  
Linear Finite Element ◽  
Bolt Preload ◽  
Gap Opening ◽  
Parametric Studies ◽  
Contact Surfaces ◽  
Lift Off

The present paper describes the structural analysis performed on a preloaded bolted joint. The first joint modeled was comprised of a conventional cylindrical flange that was sliced to simplify the analysis for two bolts in lieu of four. This involved an L-shaped flat segment flange. Parametric studies were performed using elastic, large-deformation, non-linear finite element analysis to determine the influence of several factors on the bolted-joint response. The factors considered included bolt preload, contact surfaces, edge boundary conditions, and joint segment length in this first approach. The second model applied the previous preloaded torque on a complex flange to study the flange lift off. Joint response is reported in terms of displacements, gap opening, and surface strains. Most of the factors studied were determined to have minimal effect on the bolted joint response.

Experimental Studies of Glass Reinforced Aluminum (GLARE) Bolted Joint

2012 ◽  
Vol 217-219 ◽  
pp. 124-129
Author(s):  
Ji Feng Zhang ◽  
Zi Zhen Cao ◽  
Yong Gang Xie
Keyword(s):  
Impact Resistance ◽  
Experimental Studies ◽  
High Strength ◽  
Geometric Parameters ◽  
Experimental Program ◽  
Bolted Joint ◽  
Threshold Values ◽  
Tightening Torque ◽  
High Fatigue ◽  
Ply Orientation

GLARE laminates with outstanding impact resistance, high fatigue resistance and a number of excellent performances are combined by ductile aluminum layers and high strength FRP layers. An experimental program was conducted to estimate the influence of geometric parameters, ply orientation and tightening torque on the performances of GLARE bolted joint. The study showed that the parameters of GLARE bolted joint have intrinsic properties of metal bolted joint and composite bolted joint. The design threshold values including of geometric parameters, ply orientation and tightening torque were given.

scholarly journals Stress-strain state of friction joints with laser treatment of contact surfaces

Vestnik MGSU ◽  
2019 ◽  
pp. 72-82
Author(s):  
Martynov Gleb V ◽  
Aleksey I. Makarov ◽  
Elena A. Morina ◽  
Daria E. Monastyreva
Keyword(s):  
Safety Margin ◽  
High Strength ◽  
Hydraulic Press ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Strength Characteristics ◽  
Future Research ◽  
High Tech ◽  
Widespread Application ◽  
Contact Surfaces

Introduction. Researched is conducted to determine the possibility of using an alternative method - laser cleaning. Laser systems have proven themselves in many areas and are a high-tech and effective solution for many construction problems. Despite this nowadays sandblasting is the most common method of processing contact surfaces of high-strength bolted joints - an outdated technology, with high equipment wear and even dangerous to people’s health. Materials and methods. Sandblast and laser-treated specimens were tested for shear. Before testing, the roughness of the contact surfaces and the tension force of high-strength bolts were tested. During the test, the readings of the meter and dial-indicator were taken. The experiments were carried out on a hydraulic press IPS-500, the samples were provided in a processed form. Results. According to the data obtained, strain graphs were plotted and the shear forces of the samples were calculated. Calculated efforts were compared with standard values. The results show the compliance of samples with the requirements of SP 35.13330.2016 “Bridges and pipes” in terms of strength characteristics. Samples with laser surface cleaning have a safety margin value similar to sandblasted samples. Conclusions. Comparison of the strength characteristics proves the possibility of using laser cleaning of the contact surfaces of friction joints. After the transition from outdated technologies, the process of surface preparation can be made economical and environmentally friendly. The obtained values and data can be entered into a number of regulatory documents, including SP 35.13330.2016 “Bridges and pipes” for future research and the widespread application of the method.

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