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

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.

scholarly journals Research on the Response Characteristics of Bio-Inspired Composite Sandwich Structure under Low Velocity Impact

2021 ◽  
Vol 2101 (1) ◽  
pp. 012087
Author(s):  
Peng Hao ◽  
Lin’an Li ◽  
Jianxun Du
Keyword(s):  
Sandwich Structure ◽  
Mechanical Response ◽  
Shear Fracture ◽  
Impact Load ◽  
High Energy ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Response Characteristics ◽  
Composite Sandwich ◽  
The Impact

Abstract In order to research the impact mechanical response characteristics of the bio-inspired composite sandwich structure, the hemispherical impactor is preloaded with different energy to impact bio-inspired and conventional composite sandwich structure, the stress distribution and dynamic response characteristics of composite sandwich structure under impact load are studied. The results show that the main damage of the upper panel is fiber shear fracture, while crushing fracture for the core, and the main damage of the lower panel is fiber tensile tearing under different impact load. The bio-inspired composite sandwich structure shows better impact resistance in terms of damage depth and maximum impact load under the same impact energy. From the perspective of energy consumption, the bio-inspired structure absorbed more energy than conventional structure under high energy impact.

scholarly journals Carrying Capacity of Round Timber Bolted Joints with Steel Plates Under Static Loading / Únosnost Svorníkových Spojů Kulatiny S Vloženými Ocelovými Plechy Při Jednorázovém Statickém Namáhání

2012 ◽  
Vol 12 (2) ◽  
pp. 100-105 ◽  
Author(s):  
Antonín Lokaj ◽  
Kristýna Klajmonová
Keyword(s):  
Carrying Capacity ◽  
Static Loading ◽  
Laboratory Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Bolted Connections ◽  
Static Tests ◽  
Deformation Response ◽  
Timber Connections ◽  
Round Timber

Abstract Aim of this article is in presentation of results of static tests of round timber bolted connections with steel plates. Round timber connections tests in tension were made on pressure machine EU100 in laboratory of the Faculty of Civil Engineering VSB-TU Ostrava. Results of laboratory tests have been statistically evaluated and completed by graphical records of deformation response on loading.

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.

Electromagnetic Micro-Punching Process of T2 Copper Foil

2015 ◽  
Vol 1120-1121 ◽  
pp. 1220-1225 ◽  
Author(s):  
Qing Juan Zhao ◽  
Jie Xu ◽  
Chun Ju Wang ◽  
De Bin Shan ◽  
Bin Guo
Keyword(s):  
Copper Foil ◽  
Shear Fracture ◽  
Impact Load ◽  
Foil Thickness ◽  
Metal Foil ◽  
Discharge Energy ◽  
Micro Holes ◽  
Micro Hole ◽  
Punching Process ◽  
Main Factor

Electromagnetic micro-punching is a novel micro-punching process in which metal foil occur plastic deformation until shear fracture under magnetic impact load. In this paper, electromagnetic micro-punching process was investigated on T2 copper foil. Effects of discharge energy, foil thickness and discharging time on micro punching were discussed. The results show that micro holes were successfully pierced with the discharge energy more than 5.0 kJ on copper foil of 20 μm in thickness. Foil thickness is the main factor in electromagnetic micro-punching with the discharging energy of 7.2 kJ. In addition, increasing discharging time can punch micro hole on thicker foil. The micro holes with diameter of 0.4-1.4 mm were successfully punched on 20 μm copper foil in thickness with discharge energy of 7.2 kJ.

Mechanical Behavior of High-Tension Bolted Joints with Varying Bolt Size and Plate Thickness

2007 ◽  
Vol 348-349 ◽  
pp. 81-84
Author(s):  
Seung Yong Lee ◽  
Cheol Woo Park ◽  
Soon Cheol Kwon ◽  
Hee Hyun Lee
Keyword(s):  
Stress Distribution ◽  
Compressive Stress ◽  
Plate Thickness ◽  
Bolted Joints ◽  
Steel Plates ◽  
Strain Gages ◽  
Long Span Bridges ◽  
Long Span ◽  
High Tension ◽  
Bolt Holes

The use of steel plates has been greatly increased in bridge construction, particularly for long-span bridges, and connections between the plates are made usually using high-tension bolts. However, the specifications on the use of large-sized high-tension bolts are not adequately stated in the currently available construction manuals. In order to provide further information on the use of the large-sized high-tension bolts, this study experimentally investigated the relaxation and slip behavior of M30 bolts with varying bolt size and plate thickness. In addition, numerical evaluation using FEM was performed to investigate the compressive stress occurred on the inside of bolt hole. The analyzed results were compared with the stress distribution measured from strain gages attached on the bolts and bolt holes. From the study presented herein, it was found that the relaxation was increased as the size of bolt increased, and that the M30 high-tension bolts developed slip coefficient greater than 0.4. The thickness of plate did not significantly affect the compressive stress distribution around the bolt holes.

Reinforced Round Timber Bolted Joints under Cyclic Loading

2014 ◽  
Vol 1020 ◽  
pp. 199-203
Author(s):  
Antonín Lokaj ◽  
Kristýna Klajmonová
Keyword(s):  
Cyclic Loading ◽  
Carrying Capacity ◽  
Laboratory Tests ◽  
Fatigue Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Dynamic Tests ◽  
Bolted Connections ◽  
Timber Joints ◽  
Round Timber

Aim of this article is in presentation of results of dynamic tests of reinforced round timber bolted connections with slotted – in steel plates. Multicyclic dynamic (fatigue) tests in tension were made with round timber joints on pulsator. Results of laboratory tests have been statistically evaluated and completed with graphical records of carrying capacity of connections in tension corresponding to number of loading cycles.

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.

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