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Modelling of Two-Seat Connection to the Frame of Rail Wagon in Terms of Resistance at Impact Test

References [1] Čech, R.: Modelling Two-seat Connection to the Frame of Rail Wagon in Terms of Resistance at Impact Test. Ostrava: VŠB - TUO, 2015. Diploma thesis. (in Czech) [2] Masopust, J.: Impact Resistance Test of Welded Two-seat Connection. Fryčovice: BORCAD cz s.r.o., 2014. Technical report. (in Czech) [3] Wu, S. R., Gu, L.: Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics, New Jersey, John Wiley & Sons, Inc., 2012. ISBN 9780470572375. [4] Abdollahpoor, A

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Impact Tests of UHSS Steel Welded Joints Using the Drop - Tower Impact Drop Method

Abstract

The article characterizes the impact test method using Drop-Tower Impact Test with the registration of the value of force and energy of breaking. Based on sources, the possibilities and scope of the current application of this method were determined and the current state of knowledge on the results of these tests was reviewed. In order to determine the possibility of using the method in impact tests of high strength steel joints, investigations of hybrid PTA - GMA welding conditions on impact strength of joints of MART S1300QL steel were carried out. In particular, the influence of t8/5 cooling time on the impact strength of welded joints by the Drop - Tower Impact Test method was determined. It has been shown that the use of dropping machine with computer-based registration of breaking force and energy values was possible in the case of impact strength testing of UHSS welded joints and enabled precise analysis of the energy distribution dynamics absorbed by the tested.

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Lab-scale impact test to investigate the pipe-soil interaction and comparative study to evaluate structural responses

Abstract

This study examined the dynamic response of a subsea pipeline under an impact load to determine the effect of the seabed soil. A laboratory-scale soil-based pipeline impact test was carried out to investigate the pipeline deformation/strain as well as the interaction with the soil-pipeline. In addition, an impact test was simulated using the finite element technique, and the calculated strain was compared with the experimental results. During the simulation, the pipeline was described based on an elasto-plastic analysis, and the soil was modeled using the Mohr-Coulomb failure criterion. The results obtained were compared with ASME D31.8, and the differences between the analysis results and the rules were specifically investigated. Modified ASME formulae were proposed to calculate the precise structural behavior of a subsea pipeline under an impact load when considering sand- and clay-based seabed soils.

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Gravelling Test for Rail Windshield

Abstract

During preliminary tests of locomotive windshield resistance to gravelling, according to the applicable standard PN-EN 15152:2007, carried out in the Institute of Aviation, the problem of the projectile overturning after leaving the cannon barrel was detected. Three tests recorded with a high-speed camera are presented in this article. This problem was found to be due to the incorrect projectile geometry.

In order to stabilise the trajectory of the projectile, four types of projectiles were made using military experience. All of them meet relevant test conditions from the point of view of the test piece (locomotive windshield). The best projectile modification was obtained in the tests with an average deviation of the expected impact angle of 11° compared to 75° for a projectile made exactly according to the guidelines of the standard. Each of 22 modified projectiles hit the test piece with the tip, while out of the 12 original projectiles only 4 hit the test piece with the tip. The impact test results confirm that it is possible to perform a gravelling test according to the standard concept, but it seems necessary to clarify the standard requirements and to modify the projectile shape.

The article contains a proposal for the projectile modification and highlights inaccuracies in the standard concerning the gravelling test.

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Influence of cathodic-protection-induced hydrogenation on mechanical properties of two ship hull plate steels

Influence of cathodic-protection-induced hydrogenation on mechanical properties of two ship hull plate steels

Tensile testing and Charpy V impact testing results for two ship hull steels: an ordinary strength steel grade A and a higher strength steel grade AH32 each in both as-received conditions and in hydrogenated by zinc protector in salt water conditions. For both steels the hydrogenation has slightly increased yield stress (Re) and elongation (A) and has not influenced ultimate tensile strength (Rm), while reduction of area has been unchanged (A steel) or even decreased (AH32 steel) due to the hydrogenation. The effect of the hydrogenation on Charpy tests results has evidently been beneficial: the increase of Charpy energy and of percent fibrosity (ductility) of fracture appearance as well as a shift down of ductile-brittle transition temperatures have been observed. It seems that the present practice to evaluate the mechanical properties of ship steels by testing the specimens without hydrogenation leads to conservative results. The Authors have hypothesized that the beneficial effect of hydrogenation can occur if the deformation rate is fast enough, the notch is sharp enough (although only for specimens hydrogenated in unstressed conditions) and hydrogen concentration is moderate.

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Experimental Study of Hybrid Rubberized Composite Slabs

Abstract

Rubberized concrete is made up of scrap tyre rubbers where the fine aggregate is partially replaced by it, as the waste rubber is being a threat to the environment. It is estimated that only 4% of the waste tyre is used in the application of civil engineering and also there is shortage of fine aggregates. The primary objective of this study is to investigate the preliminary concrete properties of M25 and M30 concretes. The fine aggregate is replaced by pre-treated crumb rubber with 10, 15 and 20 % of total weight. Various tests are conducted on the rubberized concrete specimens such as compressive strength, split tensile strength, flexural strength and slump test. The investigation is carried out to determine the impact load behavior of hybrid rubberized composite slabs. In addition 0%, 1%, 1.5%, and 2% of replacement of rubber fibers for total weight of coarse aggregate is also made. The specimen of size 300 mm x 300 mm x 50 mm thickness is subjected to drop hammer test to find its performance against the impact loads. The number of blows for the first crack and complete failure of slab was found and the characteristics were studied.

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Experimental Evaluation of the Effect of Silica Fume on Compressive, Tensile Strength, Abrasion Resistance, Slump and Impact Test and Water Permability Coefficient of Concrete

Abstract

The use of various additives (admixtures) in concrete and cement products has been considered by various researchers in recent years. Microsilica (Silica fume) can also be considered as one of the most widely used additives (admixtures) in this section. In this study, 120 concrete specimens were constructed using a mix design based on ACI in the laboratory with an overview of records and advantages of using microsilica in concrete. The microsilica used in concrete specimens has been considered 2%, 5.5% and 7.5% by weight of cement. Finally impact permeability, tension and uniaxial compressive strength tests were done on concrete specimens and their mechanical properties were evaluated. The results show that microsilica improves the mechanical properties of concrete. The results also show that the use of microsilica in ordinary concrete has a very positive effect in controlling the surface cracks and increasing some strength parameters such as tensile and compressive strength of concrete.

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The Effect of Notch Depth on CTOD Values in Fracture Tests of Structural Steel Elements

REFERENCES 1. S. Kocańda and J. Szala, Fundamentals of fatigue calculations (in Polish) , Warsaw: Wydawnictwo Naukowe PWN, 1997. 2. ASTM, E23 – 16b Standard Test Methods for Notched Bar Impact Testing of Metallic Materials, West Conshohocken (PA): ASTM International, 2016. 3. Polish Committee for Standardisation, PN-EN ISO 148-1:2017-02 Metals – Charpy impact test – Part 1: Test method (in Polish), Warsaw: Polish Committee for Standardisation, 2017. 4. Polish Register of Shipping, Rules for the Classification and Construction of Sea

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Evaluation of mechanical properties of gas pipeline DN 500 after more than 40 years of its operation

, Mechanika (54) 2005 , 5–11. 16. Sheng-Zhu Z., Song-Yang, L., Si-Ning, Ch., Zong-Zhi, W., Ru-Jun, W., Ying-Quan, D. Stress analysis on large-diameter buried gas pipelines under catastrophic landslides, Petroleum Science (14) 2017 , 579–585. 17. Yang, Y., Wang, W.Q., Song, M.D. The Measurement of Mechanical Properties of Pipe Steels in Service through Continuous Ball Indentation Test, Procedia Engineering (130) 2015 , 1742–1754. 18. Hashemi, S.H., Howard, I.C., Yates, J.R., Andrews, R.M. Measurement and Analysis of Impact Test Data for X100

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The Possibility of Increasing the Wearing Resistance of Mulcher Tools

pendulum impact test. Part 1: Test method. SÚTN Bratislava. STN EN ISO 6507-1. 2006. Metallic materials. Vickers hardness test. Part 1: Test method. SÚTN Bratislava. ŤAVODOVÁ M. - KALINCOVÁ, D. - HNILICOVÁ, M. - HNILICA, R. 2016. The influence of heat treatment on tool properties mulcher. In Manufacturing Technology, vol. 16, no. 5, pp. 1169-1173. Tolnai, R. - Čičo , P. - Kováč , I. 2006. Impact strength of steels as a criterion of material resistance. In Acta Technologica Agriculturae, vol. 9, no. 1, pp. 17

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