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1.
Experimental study of crack propagation through cladded 316L/S355 steel produced by the hot-roll bonding process
Edvard Bjelajac, Andrej Skumavc, Fidan Smaili, Gorazd Lojen, Jožef Predan, Tomaž Vuherer, 2023, izvirni znanstveni članek

Opis: A hot-rolled clad plate made of 316L stainless steel and S355 carbon steel was produced in a real industrial environment via GMAW welding, vacuuming, preheating to 1240 °C, and hot-roll bonding on four stand plate mills in nine passes with reduction rates between 20-6% per pass. The clad plates were solution annealed to achieve the usual delivery condition. Ultrasound testing showed a bonding rate of 100%. Metallographic examination revealed predominantly low concentrations of oxides at the interface. The tensile strength of the bond reached 155 MPa. The shear strength always satisfied the requirements of ASTM A264. It was observed that the concentration of oxide particles influenced the shear strength strongly. The lowest measured value was 172 MPa. Specimens notched in the base material and specimens notched in the clad layer were used in the Charpy impact test. In every case, only the notched layer broke, while the other layer was only bent. The absorbed energies were always higher than those of each material alone. Fracture mechanic tests gave similar results. The crack could not propagate from the notched layer into the other one, regardless of the material of the notched layer. Instead, delamination occurred. Due to delamination, K1c could not be determined, so KQ was given instead.
Ključne besede: clad plate, hot-roll bonding, shear strength, tensile strength, impact toughness, crack propagation
Objavljeno v DKUM: 28.03.2024; Ogledov: 125; Prenosov: 9
.pdf Celotno besedilo (18,79 MB)
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2.
Relationship between the compressive and tensile strengths of lime-treated clay containing coconut fibres
Vivi Anggraini, Bujang Huat, Afshin Asadi, Haslinda Nahazanan, 2015, izvirni znanstveni članek

Opis: The effects of coconut fibre on the mechanical characteristics of lime-treated clay are investigated in this study. The lime-treated clay specimens were prepared with a variety of coconut-fibre contents, i.e., 0.5%, 1%, 1.5% and 2%, in terms of the weight of dry soil. The stabilized specimens were tested at 7, 28 and 90 days after the treatment in order to observe the evolution of the mechanical resistance with time. The results of the unconfined compressive strength tests were used to determine the relationships between the compressive strengths and the indirect tensile strengths of the stabilized soil. Furthermore, the optimum percentage of coconut fibre mixed in the soil/lime mixtures was 1% of the dry mass and reinforcement at 90 days increases the peak compressive strength and the indirect tensile strength. Coconut-fibre inclusion changes the brittle behaviour of the lime-treated clay soil to give it a more ductile character.
Ključne besede: coconut fibre, lime, compressive strength, indirect tensile strength, clay soil, failure characteristics
Objavljeno v DKUM: 14.06.2018; Ogledov: 1218; Prenosov: 50
.pdf Celotno besedilo (755,61 KB)
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3.
The importance of tensile strength in geotechnical engineering
Ivan Vaníček, 2013, izvirni znanstveni članek

Opis: Many Soil mechanics textbooks contain only limited information about tensile characteristics. Šuklje’s “Rheological aspects of soil mechanics” [1] is an exception, as he devoted a special chapter to this problem “Tensile and Bending Strength of Soils”. Therefore, it is not a great surprise that the subject of the 13th Šuklje’s Lecture is devoted to soil behaviour in tension. Tensile tests are briefly described, some results as well, with a distinction between undrained and drained tests. Practical examples of the application of the results are discussed, firstly in cases where the development of tensile cracks can be expected. Because the results of the drained tests give more information about the bonds between individual particles, some theoretical aspects of these tests are discussed as well.
Ključne besede: tensile cracks, tensile strength, bending, triaxial drained tensile test
Objavljeno v DKUM: 14.06.2018; Ogledov: 1422; Prenosov: 74
.pdf Celotno besedilo (549,04 KB)
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4.
Intelligent system for prediction of mechanical properties of material based on metallographic images
Matej Paulič, David Močnik, Mirko Ficko, Jože Balič, Tomaž Irgolič, Simon Klančnik, 2015, izvirni znanstveni članek

Opis: This article presents developed intelligent system for prediction of mechanical properties of material based on metallographic images. The system is composed of two modules. The first module of the system is an algorithm for features extraction from metallographic images. The first algorithm reads metallographic image, which was obtained by microscope, followed by image features extraction with developed algorithm and in the end algorithm calculates proportions of the material microstructure. In this research we need to determine proportions of graphite, ferrite and ausferrite from metallographic images as accurately as possible. The second module of the developed system is a system for prediction of mechanical properties of material. Prediction of mechanical properties of material was performed by feed-forward artificial neural network. As inputs into artificial neural network calculated proportions of graphite, ferrite and ausferrite were used, as targets for training mechanical properties of material were used. Training of artificial neural network was performed on quite small database, but with parameters changing we succeeded. Artificial neural network learned to such extent that the error was acceptable. With the oriented neural network we successfully predicted mechanical properties for excluded sample.
Ključne besede: artificial neural network, factor of phase coherence between the surfaces, fracture toughness, image processing, mechanical properties, metallographic image, ultimate tensile strength, yield strength
Objavljeno v DKUM: 12.07.2017; Ogledov: 1465; Prenosov: 424
.pdf Celotno besedilo (2,02 MB)
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