Specification for Low and Intermediate Tensile Strength Carbon-Silicon Steel Plates for Machine Parts and General Construction

The article contains the analysis of thermoplastics used in prototyping machine parts. We used several types of experimental samples with different filling percentages. The equipment on which the experimental studies were carried out is shown. During the experiment, a specialized tensile testing machine was used. The experimental samples were installed in the developed centering device. Normal conditions were observed during the tests. The results of an experimental tensile study of PLA-plastic specimens are presented. The typical stress-strain diagram of an experimental sample is described, which describes the dependence of stress on relative deformation. An equation of the linear dependence of the tensile strength on the percentage of filament filling has been compiled, which makes it possible to determine the tensile strength of the product at any percentage of the filling of the plastic filament. The assessment is adequately verified by Fisher's criterion. Recommendations for filament filling in prototyping machine parts are given.

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Reinforcement Possibilities of Round Timber Bolted Joints

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1082.359 ◽

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.

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Microstructures and Mechanical Properties of Welded Joints of Several High Tensile Strength Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.941.224 ◽

2018 ◽

Vol 941 ◽

pp. 224-229

Author(s):

Takahiro Izumi ◽

Tatsuya Kobayashi ◽

Ikuo Shohji ◽

Hiroaki Miyanaga

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Weld Metal ◽

Welded Joints ◽

Welded Joint ◽

Steel Plates ◽

Fatigue Properties ◽

High Tensile Strength ◽

The Matrix ◽

Microstructures And Mechanical Properties

Microstructures and mechanical properties of lap fillet welded joints of several high and ultra-high tensile strength steel by arc welding were investigated. Steel plates having tensile strength of 400 (SPH400W), 590 (SPC590Y, SPC590R), 980 (SPC980Y) and 1500 MPa (SAC1500HP) class with 2 mm thickness were prepared. Four types of joints were formed by MAG welding; SPH400W/SPH400W, SPC590Y/SPC590Y, SPC980Y/SPC980Y and SAC1500HP/SPC590R. In joints with SPC590Y, SPC980Y and SAC1500HP steel which matrixes are martensitic microstructures, the HAZ softens due to transformation of martensite into ferrite with precipitating cementite. By using high and ultra-high tensile strength steel, the weld metal is strengthened due to dilution of the matrix into the weld metal and thus tensile shear strength of the welded joint increases. In the fatigue test, similar S-N diagrams were obtained in the all welded joints investigated. It seems that the effect of stress concentration due to the shape of the welded joint on fatigue properties is larger than that of the strength of the matrix.

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Impact Fracture of Jointed Steel Plates of Bolted Joint of Cars

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.566.232 ◽

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.

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