Impact Fracture of Jointed Steel Plates of Bolted Joint of Cars

2014 ◽  
Vol 566 ◽  
pp. 232-237
Author(s):  
H. Ambarita ◽  
M. Daimaruya ◽  
H. Fujiki
Keyword(s):  
Tensile Strength ◽  
Shear Test ◽  
Fracture Criterion ◽  
Shear Fracture ◽  
Impact Fracture ◽  
Bolted Joints ◽  
Steel Plates ◽  
Bolted Joint ◽  
Car Body ◽  
The Impact

The present study is concerned with the development of a fracture criterion for the impact fracture of jointed steel plates of a lap bolted joint used in the suspension parts of a car body. For the accurate prediction of crash characteristics of car bodies by computer-aided engineering (CAE), it is also necessary to examine the behaviour and fracture of the jointed steel plates subjected to impact loads. Although the actual impact fracture of jointed steel plates of a lap bolted joint in cars is complicated, for simplifying it is classified into the shear fracture and the extractive fracture of jointed steel plates. Three kinds of steel plates, i.e., common steel with the tensile strength of 270 MPa and two high tensile strength steels with the tensile strength of 440 and 590 MPa level used for vehicles, are examined. In the impact shear test, the specimens are made of two plates and jointed by a bolt, and in the impact extractive test the specimens are made of a plate and drilled in the centre for a bolt. The impact shear test of jointed steel plates of lap bolted joints is performed using a modified split Hopkinson bar apparatus, while the impact extractive one is performed using one-bar method. Numerical simulations by a FEM code LS-DYNA are also carried out in order to understand the mechanism of shearing and extractive fractures process of jointed steel plates. The obtained results suggest that a stress-based fracture criterion may be developed for the impact shearing and extractive fractures of jointed steel plates of lap bolted joints used in a car body.

Reinforcement Possibilities of Round Timber Bolted Joints

2014 ◽  
Vol 1082 ◽  
pp. 359-364
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Tensile Strength ◽  
Civil Engineering ◽  
Bolted Joints ◽  
Steel Plates ◽  
Mechanical Reinforcement ◽  
With Screws ◽  
Test Result ◽  
Round Timber ◽  
Rate Of Improvement

In this article the results of round timber bolted joints with inserted steel plates tests are presented. First, unreinforced round timber specimens were tested. Mechanical reinforcement by using modified washers, steel bands, BOVA plates and boost with screws of round timber specimens based on test result was then proposed. Reinforced specimens of various densities were then tested and rate of improvement in tensile strength was established for each of five proposed reinforcement methods. Tests were carried out on EU100 pressure machine in Faculty of Civil Engineering of VŠB-TUO Ostrava.

The Impact of Qualified Bolting Specialists on the Safe, Reliable Assembly and Operation of Bolted Flanged Connections

2015 ◽  
Author(s):  
A. Fitzgerald (Jerry) Waterland ◽  
David Lay ◽  
Michael Dodge
Keyword(s):  
Work Force ◽  
Pressure Vessels ◽  
Bolted Joints ◽  
Critical Area ◽  
Bolted Joint ◽  
Learning Program ◽  
Guideline Document ◽  
The Impact ◽  
Joint Assembly

Why do we certify welders but require no evidence of training or competence from those performing the critical bolted flanged joint assembly of pressure vessels and piping throughout the same industries? To remedy this situation ASME has recently released the first comprehensive standard in ASME PCC-1-2013 Appendix A that establishes uniform criteria, not just for the quality of the bolted joints but for the workers who assemble them. To support this critical training and qualification standard, ASME Training & Development has created a unique blended learning program for pipe fitters and mechanics to become Qualified Bolting Specialists (QBS), per the requirements outlined in PCC-1-2013 Appendix A. The purpose of this technical presentation is to explain the opportunities presented by this new standard and how industry can benefit from a better-trained work force in this critical area of bolted joint assembly. The authors have been integrally involved in the development of both the PCC-1 guideline document, and the ASME qualification program, and can authoritatively answer industry’s questions.

Accelerated weathering of bolted joints prepared from woven glass fiber-reinforced nanocomposites

2019 ◽  
Vol 233 (10) ◽  
pp. 2108-2125
Author(s):  
Kulwinder Singh Chani ◽  
JS Saini ◽  
H Bhunia
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Accelerated Aging ◽  
Hole Diameter ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Fiber Matrix ◽  
Nanoclay Content

This work deals with the accelerated aging of the bolted joints prepared from glass fiber-reinforced nanocomposite laminates. ASTM D5961 was used to design the bolted joint, and the geometric parameters, i.e. width-to hole-diameter ( W/ D) ratio and edge distance-to-hole diameter ( E/ D) ratio were fixed to 6 and 5, respectively. ASTM D1544 was used for accelerated aging, and a maximum of 500 h cyclical ultraviolet exposure, 8 h of ultraviolet radiation at 60 ℃ followed by 4 h of condensation at 50 ℃, was given to the specimens. A full factorial design of experiment was conducted on important control factors, i.e. aging time, bolt torque, and material variation, using response surface methodology. To investigate the effect of nanoclay content, a range of 0–5 wt% was investigated. Specimens with 3 wt% of nanoclay demonstrated optimum tensile strength and were selected to manufacture the bolted joint. Nanoplatelets having high aspect ratio increased the specific surface area and thus the tensile strength of the nanocomposite. It was found that the strength of the joints prepared with and without the nanoclay content decreased with the increase in the duration of aging. However, the joints with the nanoclay content had higher failure loads. The strength retention in the joints with nanoclay content was more in comparison to the joints made with neat epoxy. Nanoclay acted as a mechanical interlock at the fiber–matrix interface and improved the interfacial bond strength. A good dispersion of nanoclay also acts as a barrier to the moisture, which eventually reduces the degradation of the composite material due to the lesser fiber–matrix de-bonding under accelerated aging conditions.

Round Timber Bolted Joints with Mechanical Reinforcement

2013 ◽  
Vol 838-841 ◽  
pp. 629-633 ◽  
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Tensile Strength ◽  
Civil Engineering ◽  
Bolted Joints ◽  
Steel Plates ◽  
Mechanical Reinforcement ◽  
Static Tests ◽  
Timber Joints ◽  
With Screws ◽  
Round Timber ◽  
Rate Of Improvement

This paper presents the results of static tests of round timber bolted joints with inserted steel plates. All round timber joints static tests in tension were carried out on pressure machine EU 100 in laboratory of the Faculty of Civil Engineering VŠB-TU Ostrava. At first, timber specimens were tested without reinforcement. Based on these results, mechanical reinforcement methods were proposed: using modified washers and boost with screws. These samples were also tested. Rate of improvement in tensile strength was established for used reinforcement method.

Round Timber Bolted Joints Reinforcement Methods

2014 ◽  
Vol 1020 ◽  
pp. 351-355 ◽  
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Bolted Joints ◽  
Steel Plates ◽  
Bolted Joint ◽  
New Approach ◽  
Static Tests ◽  
Tension Tests ◽  
Tension Testing ◽  
With Screws ◽  
Round Timber ◽  
Rate Of Improvement

This paper presents the results of static tests of non-reinforced and reinforced round timber bolted joints with slotted-in steel plates. In this article, a new approach to the reinforcement of round timber bolted joints is presented. Based on results from tension tests of timber bolted joint samples, reinforcement methods were proposed. From these, modified washers and boost with screws were chosen for further tension testing. Results were compared to unreinforced ones and rate of improvement established.

Structural Optimization of Laminated Glass Plate Using Discrete Element Method

2015 ◽  
Vol 1088 ◽  
pp. 716-720 ◽  
Author(s):  
Shinobu Sakai ◽  
Kensuke Maenaka ◽  
Koetsu Yamazaki
Keyword(s):  
Tensile Strength ◽  
Discrete Element Method ◽  
Adhesive Strength ◽  
Fracture Behavior ◽  
Glass Plate ◽  
Discrete Element ◽  
Impact Fracture ◽  
Laminated Glass ◽  
Impact Fracture Behavior ◽  
The Impact

Laminated glass is widely used to enhance structural functions. The impact fracture behavior of laminated glass is more complicated than that of single glass, because of the combined influences of the large deformation and delamination strengths. In this study, the impact fracture behavior of a laminated glass plate intended for the outside surface of a modern building has been studied by numerical simulations and experiments. This fracture simulation was calculated using a Discrete Element Method (DEM) based on non-continuum mechanics. The laminated glass structures have been optimized for attaining maximum durability against impact fracture based on the response surface method. In the optimum problem, the tensile strength of the interlayer and the adhesive strength between two pieces of glass and the interlayer are taken as the design variables. From the results of the optimization, it has been observed that the laminated glass difficult to break in the case that the tensile strength was high and that the adhesive strength was a little light. The penetration performance of an optimized laminated glass plate was noticeably better in comparison with a commercial laminated glass plate.

scholarly journals Shear fracture of jointed steel plates of bolted joints under impact load

2013 ◽  
Vol 451 ◽  
pp. 012007 ◽  
Author(s):  
M Daimaruya ◽  
H Fujiki ◽  
H Ambarita ◽  
H Kobayashi ◽  
H-S Shin
Keyword(s):  
Shear Fracture ◽  
Impact Load ◽  
Bolted Joints ◽  
Steel Plates

The Preparation and Property of Organic Solvent Lignin and PVC Composite Materials

2011 ◽  
Vol 236-238 ◽  
pp. 1195-1198 ◽  
Author(s):  
Qing Wei Ping ◽  
Jing Xiao ◽  
Jian Zhao
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
Organic Solvent ◽  
Mechanical Performance ◽  
Fracture Morphology ◽  
Impact Fracture ◽  
Dispersed Phase ◽  
Bend Strength ◽  
The Impact ◽  
Scanning Electron

The organic solvent lignin in this paper was extracted from the scrap liquid of the reed ethanol pulping. The attained lignin was characterized by Scanning Electron Microscope（SEM）.On this basis，the lignin is blended with PVC and other auxiliaries, PVC/lignin composite material is prepared by pressure molding. The mechanical performance index of PVC/lignin composite material is detected and the impact fracture morphology of the PVC/lignin composite material is observed by SEM photograph. According to the research, it is indicted that the lignin and PVC has a certain degree of compatibility. The less dosage of lignin, the better compatibility lignin and PVC performances. With the increasing of dosage of lignin, the impact strength, tensile strength and bend strength of PVC/lignin composite material decrease. Compared with 5 phr PVC/lignin composite material, the dispersed phase diameter of the impact fracture morphology of 20 phr PVC/lignin composite material becomes bigger, and the uniformity of distribution becomes worse.

scholarly journals Pengaruh VariasiArus dan Posisi Pengelasan SMAW terhadap Sifat Mekanik Baja ST 37

2021 ◽  
Vol 14 (2) ◽  
pp. 134-139
Author(s):  
Iwan Nugraha Gusniar ◽  
Ahmad Juhri ◽  
Viktor Noubnome
Keyword(s):  
Tensile Strength ◽  
Weld Metal ◽  
Impact Test ◽  
Current Strength ◽  
Steel Plates ◽  
Test Results ◽  
Strong Current ◽  
The Difference ◽  
The Impact ◽  
Welding Position

The purpose of this study was to determine the difference in the value of tensile strength, impact and microstructure test results on ST 37 steel plates due to variations in current strength of 80 A, 85 A and 90 A and 1G, 2G and 3G welding positions. The results of this study show the value of Max.load, current strength of 80 A 3G welding position gets the highest value of 5650 kgf, value of Tinsile strength, current strength of 80 A 3G welding position gets the highest value of 44.78 (kgf/mm2), then the strain value, the current strength of 80 A for the 3G welding position gets the highest value of 0.9% and the value of the modulus of elasticity, the current strength of 80 A for the 3G welding position gets the highest value of 97.94 (GPa,KN/mm2), In the value of the impact test results, the current strength of 80 A is the 1G welding position that gets the highest value, which is 116 Joules. In the observation of microstructure testing, 3 points were carried out, Weld metal, HAZ and Base metal at each strong current

Energy, Torque, and Dynamics in Impact Wrench Tightening

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Paul Wallace
Keyword(s):  
Kinetic Energy ◽  
Elastic Deformation ◽  
Energy Model ◽  
Bolted Joints ◽  
Output Shaft ◽  
Bolted Joint ◽  
Dynamic Measurements ◽  
Impact Process ◽  
Joint Characteristics ◽  
The Impact

Dynamic measurements were made on an impact wrench tightening several bolted joints. Using hammer energy and bolted joint characteristics, energy absorbed by the joint and other parts of the system was calculated. The impact process is found to be consistent with an energy model in which kinetic energy of the tool hammer is primarily absorbed by the bolted joint. Hammer energy was also absorbed by elastic deformation of the tool output shaft and by friction-type losses in the components being assembled. Bolt torque is closely correlated with hammer energy delivered by the tool as was hammer rebound angle.

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