Analisis Sifat Mekanik Hasil Pengelasan SMAW dengan Akar Las Tig dan Las SMAW pada Pipa API 5L

The purpose of this research is to know the mechanical properties of the welds due to the current variation of welding joint API 5L using TIG and SMAW welding root methods. Preparation of specimens of pipe API 5L PSL1 grade X56 (Ø 177.8 mm, length 200 mm, width 7 mm), then specimens preparation were made in a single V 600, root gap 2mm, root face 2mm. Filling the welding roots with TIG welding and SMAW using electrodes E7018 with a current variation 70A, 80A, 90A. Mechanical tests consist of tensile, bending and hard test. The results showed that the quality of a good TIG root weld at 70A, the highest tensile strength of the weld joint 52.27 kgf/mm2 (70A), the highest hardnest 164,217 HRB (90A), the bending strength 1.123,061 N/mm2 (70A) using face bend method and 1,172,959 N/mm2 with root bend. In SMAW root welding, the highest tensile strength 54.27 kgf/mm2 (70 A) , the highest hardnest 158.717 HRB (70 A), the highest bending strength 1.115,611 N/mm2 (70 A) using face bend method, and 1.161,748 N/ mm2 with root bend.

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The Effect of Borax Solution as Preservative to the Mechanical Properties of Bamboo

International Journal of Sustainable Construction Engineering Technology ◽

10.30880/ijscet.2020.11.02.009 ◽

2020 ◽

Vol 11 (2) ◽

Author(s):

M.A.P Handana ◽

◽

Besman Surbakti ◽

Rahmi Karolina ◽

◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

Bending Strength ◽

Environmentally Friendly ◽

Preservative Solution ◽

Borax Solution ◽

Preservative Solutions

The use of borax solution as a preservative in wood and bamboo materials is well known in the community. A borax solution is an environmentally friendly liquid that can dissolve in water, so it is suitable to be used as a preservative within cold or hot soaking techniques. The ability of borax to resist insects and fungus attacks on bamboo has been proven, but the effect of the solution on the strength of bamboo must also be investigated. This study conducts to investigate the effects of borax and its additives as preservative solutions to the mechanical properties of bamboos. The bamboos preservations were conducted by cold conditions of immersion, while the mechanical properties were performed to understand the effects of preservatives. The result of this study indicated that 30% to 50% borax in the preservative solution is sufficient to provide significant increase in strength for compressive strength, tensile strength, and bending strength of bamboo specimen. From this study, the use of borax solution in preserving the bamboos materials improved the quality of bamboos based on its mechanical properties.

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MAG Welding of Structures Used in Means of Transport and Made of Steel DOCOL 1200M

Biuletyn Instytutu Spawalnictwa ◽

10.17729/ebis.2020.4/6 ◽

2020 ◽

pp. 65-71

Author(s):

Bożena Szczucka-Lasota ◽

Tomasz Węgrzyn ◽

Bogusław Łazarz ◽

Adam Jurek ◽

Krzysztof Ireneusz Wilczyński

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Research Work ◽

Welding Parameters ◽

Shielding Gases ◽

High Tensile Strength ◽

Moving Platform ◽

Interpass Temperature ◽

Made In

Steels of the DOCOL group, characterised by high tensile strength and yield point, play an important role in the manufacturing of means of transport. However, the above-named steels are difficult to weld and joints made in them do not guarantee comparable mechanical properties. The research work discussed in the article aimed to determine process parameters suitable for the welding of a moving platform made of steel DOCOL 1200M as well as to assess the effect of welding parameters on the quality of obtained joints. The tests also involved analysing the effect of shielding gases, preheating and interpass temperature on the quality of an 8 mm thick MAG welded moving platform structure.

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Relationships between mechanical properties of oak timber (Quercus robur L.)

Holzforschung ◽

10.1515/hf.2011.053 ◽

2011 ◽

Vol 65 (5) ◽

Cited By ~ 2

Author(s):

Guillermo Riesco Muñoz ◽

Andrés Remacha Gete

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Prediction Models ◽

Mechanical Tests ◽

Clear Wood ◽

Oak Trees ◽

Impact Bending ◽

Strength And Stiffness ◽

Selection Of

Abstract Ring-porous hardwoods such as oak are in high demand for furniture-making, cooperage, flooring, and construction. However, evaluating the quality of such timber is difficult and time consuming, and simpler tests are required. Models for predicting as many mechanical properties as possible, based on easier-to-determine mechanical tests, may help. In this study, the hardness, modulus of elasticity, bending, compression, and impact bending strength parallel to grain were tested on defect-free laths obtained from a sample of 42 oak trees. The relationships between the variables were investigated. Three models that relate the resistance to axial compression with bending strength and stiffness (R2>0.55; P<0.01) are proposed for defect-free oak timber. Selection of models mainly depended on the bias, which was highly variable among the models tested. The prediction models proposed in the international standard EN 384:2004 for structural dimension timber are not suitable for small clear wood specimens, especially in very elastic woods. The relative independence of hardness and impact bending strength as regards the other mechanical properties is also demonstrated.

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Quality of Surface Texture and Mechanical Properties of PLA and PA-Based Material Reinforced with Carbon Fibers Manufactured by FDM and CFF 3D Printing Technologies

Polymers ◽

10.3390/polym13111671 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1671

Author(s):

Mohd Shahneel Saharudin ◽

Jiri Hajnys ◽

Tomasz Kozior ◽

Damian Gogolewski ◽

Paweł Zmarzły

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Surface Layer ◽

3D Printing ◽

Carbon Fibers ◽

Tensile Tests ◽

Mechanical Tests ◽

Uniaxial Tensile ◽

Test Results

The paper presents the results of mechanical tests of models manufactured with two 3D printing technologies, FDM and CFF. Both technologies use PLA or PA-based materials reinforced with carbon fibers. The work includes both uniaxial tensile tests of the tested materials and metrological measurements of surfaces produced with two 3D printing technologies. The test results showed a significant influence of the type of technology on the strength of the models built and on the quality of the technological surface layer. After the analysis of the parameters of the primary profile, roughness and waviness, it can be clearly stated that the quality of the technological surface layer is much better for the models made with the CFF technology compared to the FDM technology. Furthermore, the tensile strength of the models manufactured of carbon fiber-enriched material is much higher for samples made with CFF technology compared to FDM.

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Effect of silver nitrate on some mechanical properties of heat polymerizing acrylic resins

Mustansiria Dental Journal ◽

10.32828/mdj.v14i1.768 ◽

2019 ◽

Vol 14 (1) ◽

pp. 110

Author(s):

Assiss. Prof. Dr. Sabiha Mahdi Mahdi ◽

Dr. Firas Abd K. Abd K.

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Silver Nitrate ◽

Surface Hardness ◽

Mechanical Tests ◽

Hardness Tester ◽

Acrylic Resins ◽

The Difference

Aim: The aimed study was to evaluate the influence of silver nitrate on surfacehardness and tensile strength of acrylic resins.Materials and methods: A total of 60 specimens were made from heat polymerizingresins. Two mechanical tests were utilized (surface hardness and tensile strength)and 4 experimental groups according to the concentration of silver nitrate used.The specimens without the use of silver nitrate were considered as control. Fortensile strength, all specimens were subjected to force till fracture. For surfacehardness, the specimens were tested via a durometer hardness tester. Allspecimens data were analyzed via ANOVA and Tukey tests.Results: The addition of silver nitrate to acrylic resins reduced significantly thetensile strength. Statistically, highly significant differences were found among allgroups (P≤0.001). Also, the difference between control and experimental groupswas highly significant (P≤0.001). For surface hardness, the silver nitrate improvedthe surface hardness of acrylics. Highly significant differences were statisticallyobserved between control and 900 ppm group (P≤0.001); and among all groups(P≤0.001)with exception that no significant differences between control and150ppm; and between 150ppm and 900ppm groups(P>0.05).Conclusion: The addition of silver nitrate to acrylics reduced significantly the tensilestrength and improved slightly the surface hardness.

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The Influence of Different Plasma Cell Discharges on the Performance Quality of Surgical Gown Samples

Materials ◽

10.3390/ma14154329 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4329

Author(s):

Atif H. Asghar ◽

Ahmed Rida Galaly

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Exposure Time ◽

Electrical Characteristics ◽

Cathode Fall ◽

Treatment Efficiency ◽

Performance Quality ◽

Surgical Gown ◽

The One

An experimental study was performed on a low-density plasma discharge using two different configurations of the plasma cell cathode, namely, the one mesh system electrodes (OMSE) and the one mesh and three system electrodes (OMTSE), to determine the electrical characteristics of the plasma such as current–voltage characteristics, breakdown voltage (VB), Paschen curves, current density (J), cathode fall thickness (dc), and electron density of the treated sample. The influence of the electrical characteristics of the plasma fluid in the cathode fall region for different cathode configuration cells (OMSE and OMTSE) on the performance quality of a surgical gown was studied to determine surface modification, treatment efficiency, exposure time, wettability property, and mechanical properties. Over a very short exposure time, the treatment efficiency for the surgical gown surface of plasma over the mesh cathode at a distance equivalent to the cathode fall distance dc values of the OMTSE and for OMSE reached a maximum. The wettability property decreased from 90 to 40% for OMTSE over a 180 s exposure time and decreased from 90 to 10% for OMSE over a 160 s exposure time. The mechanisms of each stage of surgical gown treatment by plasma are described. In this study, the mechanical properties of the untreated and treated surgical gown samples such as the tensile strength and elongation percentage, ultimate tensile strength, yield strength, strain hardening, resilience, toughness, and fracture (breaking) point were studied. Plasma had a more positive effect on the mechanical properties of the OMSE reactor than those of the OMTSE reactor.

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Effect of fillers on mechanical properties of recycled low density polyethylene composites under weathered condition

Nigerian Journal of Technological Research ◽

10.4314/njtr.v15i3.6 ◽

2020 ◽

Vol 15 (3) ◽

pp. 44-49

Author(s):

Ibiyemi A. Idowu ◽

Olutosin O. Ilori

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Pure Water ◽

Mechanical Tests ◽

Filler Loading ◽

Low Density Polyethylene ◽

Low Density ◽

Hardness Property ◽

Recycled Low Density Polyethylene ◽

Polyethylene Composites

The study examined the effect of fillers on the mechanical properties of the recycled low density polyethylene composites under weathered condition with a view of managing the generation and disposal of plastic wastes. Discarded pure water sachets and fillers (glass and talc) were sourced and recycled. Recycled low density polyethylene (RLDPE) and preparation of RLDPE/glass, RLDPE/talc and RLDPE/glass/talc composites were carried out using a furnace at compositions of 0 – 40% in steps of 10% by weight. The mixtures were poured into hand-laid mould. The samples produced were exposed to sunlight for eight (8) weeks and their mechanical properties were studied. The results of mechanical tests revealed that tensile strength decreased with increasing filler loading while impact strength and hardness property increased marginally and considerably with increasing filler loading for all the composites respectively. The study concluded that glass and talc were able to reinforce recycled low density polyethylene under weathered condition. Keywords: Recycled Low Density Polyethylene (RLDPE); Fillers; Glass, Talc; Weathering condition; Sunlight; and Mechanical properties; Tensile strength, Impact and hardness

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Influence of the surface treatment of tire rubber residues added in mortars

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952008000200001 ◽

2008 ◽

Vol 1 (2) ◽

pp. 113-120 ◽

Cited By ~ 11

Author(s):

A. C. Marques ◽

J. L. Akasaki ◽

A. P. M. Trigo ◽

M. L. Marques

Keyword(s):

Mechanical Properties ◽

Aqueous Solution ◽

Tensile Strength ◽

Compressive Strength ◽

Surface Treatment ◽

Water Absorption ◽

Modulus Of Elasticity ◽

Tire Rubber ◽

Flow Test ◽

Made In

In this work it was evaluated the influence tire rubber addition in mortars in order to replace part of the sand (12% by volume). It was also intended to verify if the tire rubber treatment with NaOH saturated aqueous solution causes interference on the mechanical properties of the mixture. Compressive strength, splitting tensile strength, water absorption, modulus of elasticity, and flow test were made in specimens of 5cmx10cm and the tests were carried out to 7, 28, 56, 90, and 180 days. The results show reduction on mechanical properties values after addition of tire rubber and decrease of the workability. It was also observed that the tire rubber treatment does not cause any alteration on the results compared to the rubber without treatment.

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The Effect of Yarn Linear Density on Mechanical Properties of Plain Woven Kenaf Reinforced Unsaturated Polyester Composite

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.465-466.962 ◽

2013 ◽

Vol 465-466 ◽

pp. 962-966 ◽

Cited By ~ 4

Author(s):

Mohd Pahmi bin Saiman ◽

Mohd Saidin Bin Wahab ◽

Mat Uzir Wahit

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Linear Density ◽

Unsaturated Polyester ◽

Composite Panel ◽

Composite Yarn ◽

Polyester Composite ◽

The Impact ◽

Woven Kenaf

To produce a good quality of dry fabric for reinforced material in a natural-based polymer composite, yarn linear density should be in consideration. A woven kenaf dry fabric with three different linear densities of 276tex, 413.4tex and 759tex were produced. The fabrics with different linear densities were been optimize with the assistance of WiseTex software. The optimized dry fabrics were infused with unsaturated polyester to produce composite panel using vacuum infusion process. The composites properties were tested on the tensile strength, flexural strength and the impact strength. The result shows that the mechanical properties of the composite increased when the yarn linear densities increased.

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Effect of Post-Process Curing and Washing Time on Mechanical Properties of mSLA Printouts

Materials ◽

10.3390/ma14174856 ◽

2021 ◽

Vol 14 (17) ◽

pp. 4856

Author(s):

Bartłomiej Nowacki ◽

Paweł Kowol ◽

Mateusz Kozioł ◽

Piotr Olesik ◽

Jakub Wieczorek ◽

...

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Curing Time ◽

Cross Sectional ◽

Post Process ◽

Order Of Magnitude ◽

Static Tensile ◽

High Roughness ◽

Ambiguous Effect

The article discusses the influence of the post-process on the mechanical properties of elements produced with the use of the mask stereolithography (mSLA) method. Printed samples were subjected to the following post-process steps: Washing and post-curing, at various times. Then, static tensile and static bending tests were carried out, as well as Shore D hardness measurements for the inner and surface part of the sample, as well as profilographometric analysis of the surface. The post-curing time has been found to strongly affect the tensile and bending strength of printouts, and to improve their surface quality. Washing has an ambiguous effect on the strength of the printouts, but, in the end, it was found that extended washing slightly reduces the strength. Washing significantly affects the quality of the printout surface. A washing time that is too short results in a surface that strongly resembles the printing process, with high roughness. Increasing the washing time to 10 min lowers the roughness by one order of magnitude. Post-curing has also been shown to be beneficial for the cured sample with the application of shielding water. This approach results in an improvement in the flexural strength of the printouts. In general, the obtained research results indicate that, for printouts with cross-sectional dimensions of several mm, the optimal washing time is no more than 10 min and the post-curing time is at least 30 min.

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