scholarly journals Laser-Beam Welding Impact on the Deformation Properties of Stainless Steels When Used for Automotive Applications

2016 ◽  
Vol 10 (3) ◽  
pp. 189-194 ◽  
Author(s):  
Emil Evin ◽  
Miroslav Tomáš ◽  
Marek Výrostek
Keyword(s):  
Tensile Test ◽  
High Strength ◽  
Bending Test ◽  
Test Results ◽  
Aisi 304 ◽  
Deformation Properties ◽  
Deformation Work ◽  
Steel Aisi ◽  
Low Alloyed Steel ◽  
Aisi 430

Abstract Materials other than standard and advanced high strength steels are remarkable for the thin-walled structures of the car-body in recent years in order to safety enhancement, weight and emission reduction, corrosion resistance improvement. Thus, there are presented in the paper the deformation properties of laser welded austenitic AISI 304 and ferritic AISI 430 stainless steels compared to these one measured for the high strength low alloyed steel H220PD. The properties were researched by tensile test and 3-point bending test with fixed ends on specimens made of basic material and laser welded one. The specimens were welded by solid state fiber laser YLS-5000 in longitudinal direction (the load direction). The deformation properties such as strength, stiffness and deformation work were evaluated and compared. The strength and stiffness were calculated from tensile test results and the deformation work was calculated from both, tensile test and 3-point bending test results. There has been found only minor effect of laser welding to the deformation properties for high strength low alloyed steel H220PD and austenitic stainless steel AISI 304. Otherwise, the laser welding strongly influenced the deformation work of the ferritic stainless steel AISI 430 as well as the elongation at tensile test.

scholarly journals Electric current effect on mechanical properties of SMAW-3G on the stainless steel AISI 304

2018 ◽  
Vol 197 ◽  
pp. 12003
Author(s):  
Edi Widodo ◽  
Iswant Iswanto ◽  
Mirtza Adi Nugraha ◽  
Karyanik Karyanik
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Tensile Test ◽  
Electric Current ◽  
Welding Process ◽  
Welding Current ◽  
Test Results ◽  
Aisi 304 ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Parameters in the welding need to be known because the effect on the mechanical properties of the material after the welding process. This research purposes to find out the influence of variation of SMAW welding current on Stainless Steel AISI 304, with variation of electric current equal to 70A, 80A and 90A.The electrode of AWS A5.4 E308-16 with diameter of 2.6 mm is used. Dye penetrant test, tensile test and metallographic test applied to analysis the characteristic. Based on data from tensile test results obtained the highest value on the specimen welding current 90A is equal to 632 MPa. The lowest tensile strength value recorded on the specimens of current 70A is 498.66 MPa.

The Selection of Materials for the Auto-Body Deformation Zones

2020 ◽  
Vol 994 ◽  
pp. 44-51
Author(s):  
Emil Evin ◽  
Miroslav Tomáš
Keyword(s):  
Tensile Test ◽  
High Strength ◽  
Bending Test ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Stretch Bending ◽  
Stiffness Constant ◽  
Wide Range ◽  
Deformation Work ◽  
Multi Phase

Nowadays, it is important to select the proper material for parts of the car-body’s deformation zones in terms of passenger safety. Due to wide range of high-strength steels on the market, the article presents the way of selecting the material by determining the deformation work and the stiffness constant, both measured by the stretch-bending test. The procedure was verified on a high-strength micro-alloyed steel HSLA, high-strength multi-phase steels DP 600 and TRIP, and an austenitic stainless steel AISI 304. The results indicate the austenitic steel is better to use in the deformation zones for the frontal impact, while multi-phase steels are more suitable for deformation zones at the lateral impact. The regression model describing the dependence of the deformation work measured at the stretch-bending test and the deformation work measured at uniaxial tensile test was defined as well. The model allows predicting the deformation work at stretch-bending test based on the mechanical properties measured by the tensile test.

Construction Technology Research of RC Beams Strengthened with Prestressed CFRP Plates

2011 ◽  
Vol 268-270 ◽  
pp. 659-663
Author(s):  
Hua Chen ◽  
Kan Kang ◽  
Lang Ni Deng
Keyword(s):  
Crack Resistance ◽  
Concrete Beams ◽  
High Strength ◽  
The Self ◽  
Bending Test ◽  
Construction Technology ◽  
Rc Beams ◽  
Test Results ◽  
Technology Research ◽  
Flexural Capacity

The method of applying prestress to CFRP plates can make full use of the characteristics of high-strength, enhance the force properties, prevent peeling damage and reduce the strain lag. Construction technology of prestressed CFRP plates strengthening reinforcement concrete beams was introduce in this paper, and bending test of 6 reinforcement concrete beams strengthened with prestressed CFRP plates were carried out based on the self-developed prestressed CFRP plates supporting anchorages. The test results indicate that the flexural capacity and crack resistance capacity can be increased compared with non-prestressed CFRP plates, and the construction technology can be adopted in practical projects.

scholarly journals Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1876
Author(s):  
Wei Xu ◽  
Xiaoshu Wei ◽  
Jintao Wei ◽  
Zhengxiong Chen
Keyword(s):  
Asphalt Concrete ◽  
High Strength ◽  
Bending Test ◽  
Steel Bridge ◽  
Test Results ◽  
Cracking Resistance ◽  
Cracking Behavior ◽  
Epoxy Asphalt ◽  
Fracture Area ◽  
Aggregate Strength

The flexural cracking resistance of an asphalt concrete mixture used in a steel bridge deck pavement needs to be higher than that of one used in ordinary pavement. In this study, mechanical experimental tests were used to evaluate the influence of the aggregate strength on the flexural cracking behavior of epoxy asphalt concrete (EAC). The aggregate fracture area of beam cross sections was quantitatively analyzed by digital image processing, and crack propagation in the mixture was analyzed using fracture mechanics theory. The bending test results showed that the EAC containing high-strength aggregates exhibited the highest flexural cracking resistance among all of the aggregate mixtures under the same conditions. The use of high-strength aggregates led to a reduction in the aggregate fracture area, thereby improving the flexural cracking resistance of the mixture. The aggregate strength had a significant influence on the flexural cracking propagation behavior of the mixture. Fatigue test results at strain-controlled levels of 600–1200 με and 15 °C showed that the aggregate strength had no evident influence on the fatigue properties of the EAC. It is recommended that high-strength aggregates are used to increase the fracture resistance of aggregates and the flexural crack resistance of EACs.

scholarly journals QUASISTATIC STRAIN RATE’S EFFECT TO THE PROPERTIES OF ADVANCED STEELS FOR AUTOMOTIVE INDUSTRY

2016 ◽  
Vol 22 (1) ◽  
pp. 14 ◽  
Author(s):  
Emil Evin ◽  
Miroslav Tomáš ◽  
Marek Výrostek
Keyword(s):  
Strain Rate ◽  
Testing Machine ◽  
Rate Sensitivity ◽  
High Strength ◽  
Strength Properties ◽  
Major Influence ◽  
Sensitivity Index ◽  
Dual Phase ◽  
Deformation Properties ◽  
Low Alloyed Steel

The paper presents the findings of the strain rate effect, described in constitutive material models by strain rate sensitivity index m, to the strength and deformation material properties. These were evaluated from stress-strain diagrams recorded at tensile test using PC controlled testing machine TiraTEST 2300 according to STN EN ISO 6892-1. The high strength low alloyed steel H220PD, dual phase steel DP 600 and Trip steel RAK 40/70 were investigated at strain rates = 0.0021, 0.083 and 0.125 s<sup>-1</sup>. The results indicate major influence of the strain rate to the strength properties while only minor influence have been found when evaluate the deformation properties. The results also shown single phase materials are more sensitive to the strain rate than dual phase materials.

scholarly journals PENIPISAN PIPA KETEL AKIBAT ELEMEN KOROSIF AIR

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
M. N. Setia Nusa ◽  
Hernadi .
Keyword(s):  
Tensile Test ◽  
Structure Analysis ◽  
Pitting Corrosion ◽  
Hardness Test ◽  
Bending Test ◽  
Test Results ◽  
Analysis Method ◽  
Micro Structure ◽  
Bending Tests ◽  
Normal Standard

Inspection and testing is done to determine the metallurgical phenomena that occur on the boiler pipes that have been operating several years continuously at a temperature of 560 ° C. The study is also intended to determine the operational feasibility of the pipeline and to avoid undetected damage.Investigation of these pipes is also carried out in the laboratory with micro-structure analysis method, inspection crust, tensile test, bending test, hardness and thickness test.From the analysis of the microstructure, boiler pipes are in condition ferrite pearlite spheroidization with a crust that is thick and contains graphite. In addition, The pipes are attacked by uniform and pitting corrosion. The results of tensile and bending tests are still normal (standard). The hardness test results show significant values compared to the standard, as well as the thickness of the pipe thinning as a result of the corrosion process.AbstrakInspeksi dan pengujian dilakukan untuk mengetahui fenomena metalurgis yang terjadi terhadap pipa ketel uap yang sudah beroperasi beberapa tahun secara terus menerus pada suhu 560°C. Penelitian juga dimaksudkan untuk mengetahui kelayakan operasional pipa tersebut dan untuk menghindari terjadinya kerusakan yang tidak terdeteksiInvestigasi pipa-pipa tersebut juga dilakukan di laboratorium dengan metode analisa struktur mikro, pemeriksaan kerak, uji tarik, uji bending, uji kekerasan dan ketebalan.Dari analisa struktur mikro, pipa ketel berada pada kondisi ferrit spheroidisasi perlit dengan lapisan kerak yang cukup tebal serta mengandung grafit. Selain itu juga terjadi serangan korosi merata dan korosi sumuran. Hasil uji tarik dan hasil uji bengkok masih normal (memenuhi standar). Hasil uji kekerasan terjadi penurunan nilai yang signifikan dibanding standar, demikian juga pada ketebalan pipa terjadi penipisan akibat dari adanya proses korosi.Keywords: Boiler pipe, spheroidization, corrosion, thinning.

The model of halfring to dental braces intended to treat for the palatal suture expansion

2017 ◽  
Vol 13 (3) ◽  
Author(s):  
Magdalena Kinga Chojdacka ◽  
Jacek Cieślik
Keyword(s):  
Tooth Enamel ◽  
The Finite Element Method ◽  
Aisi 304 ◽  
Stomatognathic System ◽  
Single Tooth ◽  
Molar Teeth ◽  
Steel Aisi ◽  
Tension Analysis ◽  
Aisi 430 ◽  
Stainless Steel Aisi

AbstractOne of the most common stomatognathic system dysfunctions on the skeletal level is the maxilla’s narrowing. Orthodontic treatment of defects occurs by using a Biderman appliance with a Hyrax screw. The appliance is placed in the jaw through the cemented rings on the premolars and molar teeth. The cement-mounting ring includes fluorine, still released to the tooth enamel, having a protective effect. Where the cement begins to crumble, it gradually weakens to maintain the ring and begins to move, or to slide up the tooth. Then, it is re-cemented, tightly filling the space between the ring and the tooth. As a result, the aim of the project was to present new conception rings whose use does not lead to a lack in enamel. The proposed new design was created in such a way that the halfring design makes it impossible to slip from a single tooth in the jaw. The project was designed to propose the shape and material of the biocompatible and durable material for the load. The comparative tension analysis and movements of the turnbuckle of the three used stainless steel (AISI 304, AISI 316L, AISI 430) have been performed by means of the finite element method (FEM).

scholarly journals Tensile analysis and assessment of carbon and alloy steels using FE approach as an idealization of material fractures under collision and grounding

2020 ◽  
Vol 7 (1) ◽  
pp. 188-198
Author(s):  
Ridwan Ridwan ◽  
Aditya Rio Prabowo ◽  
Nurul Muhayat ◽  
Teguh Putranto ◽  
Jung Min Sohn
Keyword(s):  
Carbon Steel ◽  
Tensile Test ◽  
High Carbon Steel ◽  
Strain Curve ◽  
High Strength ◽  
Medium Carbon Steel ◽  
Von Mises Stress ◽  
Stress And Strain ◽  
Stress Strain ◽  
Steel Aisi

AbstractIn this study, a numerical investigation tensile test using ANSYS on three different carbon and alloy sheets of steel: AISI 1030 medium carbon steel, AISI 1080 high carbon steel and high-strength low-alloy (HSLA) A606 steel, has been carried out. The influences of three different specimen geometries on the stress–strain curve were also investigated. Understanding the properties of these materials, such as stress–strain obtained from a tensile test, is important. Materials are subjected to forces or loads when in use, for example, steel in a ship’s hull experiences significant stresses and strains. In such situations, it is necessary to understand the characteristics of the material because grounding or collisions can occur, which deform the materials. The differences in stress and strain obtained from three specimens with different geometries and mesh sizes of 2.5, 5, 7.5, and 10 mm for all proposed steels, were observed. The results showed that the ultimate tensile strength was always lower in specimen 2 compared to the other specimens. Furthermore, the highest von Mises stress and strain contour was located in the midsection of specimens 1 and 3 in all of the proposed materials.

Correlation of Tensile Test Parameters and Bendability of High-Strength Steels

2013 ◽  
Vol 554-557 ◽  
pp. 12-20
Author(s):  
Janne Lämsä ◽  
Anu Väisänen ◽  
Jouko Heikkala ◽  
Antti Järvenpää
Keyword(s):  
Tensile Test ◽  
High Strength Steels ◽  
High Strength ◽  
Test Results ◽  
Bending Properties ◽  
Testing Method ◽  
Test Parameters ◽  
Tension Properties ◽  
Bending Radius ◽  
Materials Used

The aim of the study was to investigate correlation between bendability and tensile properties of high-strength steels. Strength and elongation in tensile test have traditionally been basic values in evaluating bending properties. Advanced high-strength (AHS) steels often have tendency for strain localization, causing risk of fractures and impairing the shape of the bend. Practice has shown that tensile test results, indicating bendability well, are not sufficiently accurate when using AHS steels. Since tensile test is a fast, simple and cheap testing method, it would be beneficial to rework it to suit better for predicting of bendability. In this study, the usability of tensile test results to predict failures in bending AHS steels has been investigated. The most common failures and failure mechanisms in bending are also presented. Test materials used were 6 mm thick AHS wear-resistant, protection and structural steels with good and poor bending properties. Minimum bending radii were determined and then compared with ten-sile test results to estimate the correlation. Conventional tensile test results, fracture surfaces and necking through width and thickness were analyzed. Correlation coefficient for measured tension properties and minimum bending radius was calculated. Results showed that in tensile test, have the best correlation with minimum bending radius with necking through the thickness and actual strain in necking area.

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