scholarly journals APLIKASI WELDING PROCEDURE SPECIFICATION (WPS) DENGAN BEVEL 300 UNTUK PENGELASAN KONSTRUKSI KAPAL TANKER 3500 LTDW HN. 309 PADA UJI BENDING DI PT. DAYA RADAR UTAMA UNIT III LAMPUNG

2020 ◽  
Vol 5 (1) ◽  
pp. 27
Author(s):  
Indah Purmayanti ◽  
Kurniawati Oktarina
Keyword(s):  
Bending Test ◽  
Welding Procedure

Proses pembuatan kapal sangat dipengaruhi oleh kekuatan bahan terutama material penyusunnya. Bahan  material dibentuk dengan menyesuaikan design kapal, melalui pembentukan pada lengkungan kapal. Kelayakan suatu kapal dapat diketahui dengan melakukan pengujian keuletan, kekerasan, kegetasan, elastisitasnya, dan dari segi lainnya. Pengujian tersebut yaitu Uji Bending, uji lengkung (bending test) merupakan salah satu bentuk pengujian untuk menentukan mutu suatu material  secara visual. Spesimen berupa material plat kapal Tanker 3500 LTDW HN. 309 dilas sesuai dengan prosedur WPS dengan bevel 300 untuk dilakukan proses uji bending. Hasil uji bending menunjukkan beban maksimal terbesar  didapat pada spesimen uji no. 2 (Root)  yaitu sebesar 3,42 kN dan beban terkecil spesimen uji no. 1 (Face) yaitu sebesar 3,07 kN. Kekuatan uji bending terbesar didapat pada spesimen uji no. 2 (Root) yaitu sebesar 1,10 kN/mm2 dan yang terkecil spesimen uji no. 1 (Face) yaitu sebesar 0,95 kN/mm2. Kekuatan pengujian bending rata-rata dari kedua spesimen uji adalah 12,34 kN/mm2. Hasil uji bending dilihat secara visual tidak memiliki adanya cacat las (defect)  dan daat diaplikasikan pada pembangunan kapal.

Pipe Bending Test With Girth Welding on X80 Grade SAW Pipes

2010 ◽  
Author(s):  
Masahiko Hamada ◽  
Hidenori Shitamoto ◽  
Shuji Okaguchi ◽  
Nobuaki Takahashi ◽  
Izumi Takeuchi ◽  
...  
Keyword(s):  
Full Scale ◽  
Bending Test ◽  
Test Program ◽  
Bending Tests ◽  
Girth Welding ◽  
Manufacturing Procedure ◽  
Girth Welds ◽  
Welding Procedure ◽  
Pipe Manufacturing ◽  
Pipe Bending

This study was planned as a part of a test program to confirm the effect of girth welds on the strain capacity of pipes. In this study, full-scale pipe bending tests are performed by using X80 SAW pipe. This paper covers pipe manufacturing procedure, developed welding procedure to obtain even match weld metal and properties of welded joints. And this work demonstrated that the X80 pipes welded under the developed procedure fractured in base metal remote from girth welded portion by full scale pipe bending test conducted under the internal pressure of 72% SMYS of X80.

Preliminary Investigation on the Flexural Behaviour of Steel Fibre Reinforced Self-Compacting Concrete Ribbed Slab

2018 ◽  
Vol 15 (1) ◽  
pp. 31
Author(s):  
Nur Aiman Suparlan ◽  
Muhammad Azrul Ku Ayob ◽  
Hazrina Ahmad ◽  
Siti Hawa Hamzah ◽  
Mohd Hisbany Mohd Hashim
Keyword(s):  
Ultimate Load ◽  
Steel Fibre ◽  
Preliminary Investigation ◽  
Bending Test ◽  
Flexural Behaviour ◽  
Self Compacting Concrete ◽  
Two Samples ◽  
Simple Support ◽  
Set Up ◽  
Ultimate Load Carrying Capacity

A ribbed slab structure has the advantage in the reduction of concrete volume in between the ribs resulting in a lower structural self-weight. In order to overcome the drawbacks in the construction process, the application of steel fibre self-compacting concrete (SCFRC) is seen as an alternative material to be used in the slab. This preliminary investigation was carried out to investigate the flexural behaviour of steel fibre self-compacting concrete (SCFRC) as the main material in ribbed slab omitting the conventional reinforcements. Two samples of ribbed slab were prepared for this preliminary study; 2-ribbed and 3-ribbed in 1 m width to identify the effect of the geometry to the slab’s flexural behaviour. The dimension of both samples is 2.5 m x 1 m with 150 mm thickness. The compressive strength of the mix is 48.6 MPa based on the cubes tested at 28 days. Load was applied to failure by using the four point bending test set-up with simple support condition. The result of the experiment recorded ultimate load carrying capacity at 30.68 kN for the 2-ribbed slab and 25.52 kN for 3-ribbed slab. From the results, the ultimate load of the 2-ribbed sample exceeds 3-ribbed by approximately 20%. This proved that even with lower concrete volume, the sample can still withstand an almost similar ultimate load. Cracks was also observed and recorded with the maximum crack width of 2 mm. It can be concluded that the steel fibres do have the potential to withstand flexural loadings. Steel fibre reduces macro-crack forming into micro-cracks and improves concrete ductility, as well as improvement in deflection. This shows that steel fibre reinforced self-compacting concrete is practical as it offers good concrete properties as well as it can be mixed, placed easier without compaction. 

Determination of the metal toughness components in impact-bending test

2018 ◽  
Vol 84 (12) ◽  
pp. 68-72
Author(s):  
A. B. Maksimov ◽  
I. P. Shevchenko ◽  
I. S. Erokhina
Keyword(s):  
Crack Growth ◽  
Specific Energy ◽  
Crack Formation ◽  
Crack Nucleation ◽  
Scale Effects ◽  
Linear Equations ◽  
Bending Test ◽  
Cross Sectional ◽  
Two Samples ◽  
Sample Width

A method for separating the work of impact into two parts - the work of the crack nucleation and that of crack growth - which consists in testing two samples with the same stress concentrators and different cross-sectional dimensions at the notch site is developed. It is assumed that the work of crack nucleation is proportional to the width of the sample face on which the crack originates and the specific energy of crack formation, whereas the work of the crack growth is proportional to the length of crack development and the specific crack growth energy. In case of the sample fracture upon testing, the crack growth length is assumed equal to the sample width. Data on the work of fracture of two samples and their geometrical dimensions at the site of the notch are used to form a system of two linear equations in two unknowns, i.e., the specific energy of crack formation and specific energy of crack growth. The determined specific energy values are then used to calculate the work of crack nucleation and work of crack growth. The use of the analytical method improves the accuracy compared to graphical - extrapolative procedures. The novelty of the method consists in using one and the same form of the notch in test samples, thus providing the same conditions of the stress-strain state for crack nucleation and growth. Moreover, specimens with different cross-section dimensions are used to eliminate the scale effects. Since the specific energy of the crack nu-cleation and specific energy of the crack growth are independent of the scale factor, they are determined only by the properties of the metal. Introduction the specific energy of crack formation and growth makes possible to assign a specific physical meaning to the fracture energy.

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