scholarly journals Effect of tensile force and shear force on bending strength and stiffness of high strength bolted tensile joints.

2002 ◽  
pp. 439-447
Author(s):  
Takashi YAMAGUCHI ◽  
Yasuo SUZUKI ◽  
Toshiyuki KITADA ◽  
Kunitomo SUGIURA ◽  
Hisayuki AKIYAMA
Keyword(s):  
Shear Force ◽  
Bending Strength ◽  
Tensile Force ◽  
High Strength ◽  
Strength And Stiffness

scholarly journals Studi Komparasi Pembebanan Analisis Jembatan Cibaruyan dengan Pembebanan Jembatan Berdasarkan RSNI T-02-2005 dan SNI 1725:2016. (Hal. 75-86)

2019 ◽  
Vol 5 (4) ◽  
pp. 75
Author(s):  
Dian Sartika ◽  
Bernardinus Herbudiman ◽  
Amatulhay Pribadi
Keyword(s):  
Shear Strength ◽  
Flexural Strength ◽  
Prestressed Concrete ◽  
Shear Force ◽  
Bending Strength ◽  
High Strength ◽  
Concrete Bridge ◽  
Type I ◽  
Prestressed Concrete Bridge ◽  
Torsion Strength

ABSTRAK Jembatan beton prategang merupakan jenis jembatan yang banyak digunakan di Indonesia karena memiliki kekuatan yang tinggi dan berat jembatan lebih ringan. Jembatan Cibaruyan yang dibangun pada tahun 2014 dan berada di Kabupaten Ciamis menggunakan jenis jembatan beton prategang tipe I girder, mengacu pada peraturan RSNI T-02-2005. Seiring dengan perubahan waktu telah ada standar pembebanan jembatan terbaru yaitu SNI 1725:2016. Karena adanya perubahan tersebut, maka akan dilakukan studi komparasi antara kedua peraturan. Pemodelan jembatan menggunakan program SAP2000 dengan menganalisis kombinasi pembebanan, perhitungan gaya prategang, tegangan girder yang terjadi, lendutan, kekuatan momen lentur, gaya torsi, dan kekuatan geser penampang girder. Dari hasil analisis didapatkan bahwa hasil pembebanan struktur atas Jembatan Cibaruyan dengan SNI 1725:2016 memiliki perbedaan momen lentur lebih besar 0,975% dibandingkan RSNI T-02-2005, gaya prategang pada RSNI T-02-2005 lebih besar 1,951% dibanding SNI 1725:2016, gaya geser dan torsi pada SNI 1725:2016 lebih besar 5,615% dan 26,127% dibandingkan RSNI T-02-2005. Kata kunci: jembatan prategang, RSNI T-02-2005, SNI 1725:2016 ABSTRACT The prestressed concrete bridge is a type of bridge that is widely used in Indonesia because it has high strength with a light structural weight. The Cibaruyan bridge in Ciamis city uses type I girder prestressed concrete bridge built in 2014 referring to the regulation of RSNI T-02-2005. As time goes by there has been a change in the regulations. SAP 2000 was used to model the bridge with the results of the analysis obtained in the form of a combination of loading, calculation of prestressing forces, stresses that occur, deflection, flexural strength, torsion strength, and shear strength. From the results of the analysis it was found that the structure of the Cibaruyan Bridge with SNI 1725:2016 had a greater bending strength of 0,975% compared to RSNI T-02-2005, the prestressed force on RSNI T-02-2005 was 1.951% greater than SNI 1725: 2016, shear force and torsion force at SNI 1725:2016 greater 5.615% and 26.127% compared to RSNI T-02-2005. Keywords: prestressed bridge, RSNI T-02-2005, SNI 1725:2016

scholarly journals Mixed Visual and Machine Grading to Select Eucalyptus grandis Poles into High-Strength Classes

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1804
Author(s):  
Michele Brunetti ◽  
Giovanni Aminti ◽  
C. Brand Wessels ◽  
Michela Nocetti
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Bending Strength ◽  
Eucalyptus Grandis ◽  
High Strength ◽  
Multivariate Regression Analysis ◽  
Acoustic Velocity ◽  
Dynamic Modulus Of Elasticity ◽  
Graded Material ◽  
Strength And Stiffness

Before round timber can be profitably used in construction, it needs structural characterization. The visual grading of Eucalyptus grandis poles was integrated with additional parameters developed by multivariate regression analysis. Acoustic velocity and dynamic modulus of elasticity were combined with density and pole diameter in the estimation of bending strength and stiffness. The best models achieved were used to group the visually graded material into qualitative structural classes. Overall, dynamic modulus of elasticity was the best single predictor; and adding density and diameter to the model improved the estimation of strength but not of stiffness. The developed parameters separated the material into two classes with very distinct mechanical properties. The models including velocity as a parameter did not perform as well. The strength grading of Eucalyptus grandis poles can be effectively improved by combining visual parameters and nondestructive measurements. The determination of the dynamic modulus of elasticity as a grading parameter should be preferred over that of acoustic velocity.

scholarly journals Preparation of High Strength Plywood from Partially Delignified Densified Wood

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1796 ◽  
Author(s):  
Matthias Jakob ◽  
Gregor Stemmer ◽  
Ivana Czabany ◽  
Ulrich Müller ◽  
Wolfgang Gindl-Altmutter
Keyword(s):  
Bending Strength ◽  
Mechanical Performance ◽  
Natural Fibers ◽  
High Strength ◽  
Densified Wood ◽  
Thickness Swelling ◽  
Resorcinol Formaldehyde ◽  
Absolute Strength ◽  
Interlaminar Shear ◽  
Strength And Stiffness

Wood and natural fibers exhibit an advantageous combination of good mechanics at comparably low density. Nevertheless, comparing absolute strength and stiffness, wood is clearly inferior to materials such as metals and engineered composites. Since there is a strong correlation between wood density and wood mechanical performance, densification by transversal compression suggests itself as a route towards improved mechanics. Partially delignified densified spruce veneers with excellent tensile properties were produced by means of an alkaline (AL) and an organosolv (OS) approach. Plywood specimens were manufactured using treated veneers glued with a phenol-resorcinol-formaldehyde adhesive and were compared with plywood samples made of native spruce veneers (Ref) and spruce veneer densified after plasticization by water impregnation (H2O). Roughly, the bending strength and the modulus of elasticity of plywood from partially delignified densified wood were improved by a factor of 2.4 and 3.5, respectively. Interlaminar shear strength did not match this improvement after partial delignification. Together with excessive thickness swelling, this might be a drawback of partially delignified densified wood in need for further research.

Ceramic Materials. Effects of Fracture Origin and Microstructure on Bending Strength of High-Strength Si3N4.

1994 ◽  
Vol 43 (489) ◽  
pp. 599-605 ◽  
Author(s):  
Akira YAMAKAWA ◽  
Takehisa YAMAMOTO ◽  
Tomoyuki AWAZU ◽  
Kenji MATSUNUMA ◽  
Takao NISHIOKA
Keyword(s):  
Bending Strength ◽  
High Strength ◽  
Ceramic Materials ◽  
Fracture Origin

scholarly journals Experimental Investigation on the Influence of Fiber Path Curvature on the Mechanical Properties of Composites

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2602
Author(s):  
Huaqiao Wang ◽  
Jihong Chen ◽  
Zhichao Fan ◽  
Jun Xiao ◽  
Xianfeng Wang
Keyword(s):  
Tensile Strength ◽  
Path Planning ◽  
Composite Laminates ◽  
Bending Strength ◽  
High Strength ◽  
Bending Test ◽  
Fiber Placement ◽  
Automated Fiber Placement ◽  
Fiber Path ◽  
Path Curvature

Automated fiber placement (AFP) has been widely used as an advanced manufacturing technology for large and complex composite parts and the trajectory planning of the laying path is the primary task of AFP technology. Proposed in this paper is an experimental study on the effect of several different path planning placements on the mechanical behavior of laminated materials. The prepreg selected for the experiment was high-strength toughened epoxy resin T300 carbon fiber prepreg UH3033-150. The composite laminates with variable angles were prepared by an eight-tow seven-axis linkage laying machine. After the curing process, the composite laminates were conducted by tensile and bending test separately. The test results show that there exists an optimal planning path among these for which the tensile strength of the laminated specimens decreases slightly by only 3.889%, while the bending strength increases greatly by 16.68%. It can be found that for the specific planning path placement, the bending strength of the composite laminates is significantly improved regardless of the little difference in tensile strength, which shows the importance of path planning and this may be used as a guideline for future AFP process.

A novel concept for evaluation of biofilm adhesion strength by applying tensile force and shear force

1996 ◽  
Vol 34 (5-6) ◽  
pp. 201-211 ◽  
Author(s):  
Akiyoshi Ohashi ◽  
Hideki Harada
Keyword(s):  
Adhesion Strength ◽  
Shear Force ◽  
Growth Stage ◽  
Open Channel ◽  
Tensile Force ◽  
Cavity Formation ◽  
Channel Reactor ◽  
Flat Surfaces ◽  
Novel Concept ◽  
Gravity Test

A novel methodology is proposed in this study to evaluate biofilm adhesion strength in two different ways: by measuring detached biomass caused by tensile force and by shear force. Tensile force was provided by centrifuging biofilm-attached plates installed on rotary tables. Shear force was provided by colliding biofilm-attached plates by gravity. Test biofilms consisting of denitrifiers were formed on the flat surfaces of square (25 cm2) plates that had been submerged in a rectangular open-channel reactor. The detachment tests revealed that, although biofilm adhesion strength was relatively high at the earlier growth stage, it drastically decreased at the later stage. The most weakened location toward biofilm depth was observed at the substratum surface, at which the adhesion strength by tensile force dropped from a several Pa to below 1 Pa as biofilms became aged. The adhesion strength by shear force was all the time more than 100 times as large as that by tensile force, even though having a similar behavior. The proportion of cavity, i.e., biofilm-absent area at the biofilm/substratum interface, increased as biofilms became mature. Cavity formation was strongly responsible for lessening the adhesion strength. It is suggested that biofilm slough-off is caused by the decline of adhesion strength by tensile force rather than by shear force.

scholarly journals Materials for Automotive Lightweighting

2019 ◽  
Vol 49 (1) ◽  
pp. 327-359 ◽  
Author(s):  
Alan Taub ◽  
Emmanuel De Moor ◽  
Alan Luo ◽  
David K. Matlock ◽  
John G. Speer ◽  
...  
Keyword(s):  
Galvanic Corrosion ◽  
Low Carbon Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
New Materials ◽  
Specific Strength ◽  
Advanced High Strength Steels ◽  
Strength And Stiffness ◽  
The Cost

Reducing the weight of automobiles is a major contributor to increased fuel economy. The baseline materials for vehicle construction, low-carbon steel and cast iron, are being replaced by materials with higher specific strength and stiffness: advanced high-strength steels, aluminum, magnesium, and polymer composites. The key challenge is to reduce the cost of manufacturing structures with these new materials. Maximizing the weight reduction requires optimized designs utilizing multimaterials in various forms. This use of mixed materials presents additional challenges in joining and preventing galvanic corrosion.

Study on the Performance of the New High-Strength Steel-Encased Concrete Composite Beam (SCCB)

2013 ◽  
Vol 756-759 ◽  
pp. 161-165
Author(s):  
Qi Yin Shi ◽  
Chao Liu ◽  
Li Lin Cao ◽  
Zhen Wang
Keyword(s):  
Cross Section ◽  
High Strength Steel ◽  
High Strength Concrete ◽  
Composite Beam ◽  
High Performance ◽  
Bending Strength ◽  
Theoretical Study ◽  
High Strength ◽  
Simply Supported ◽  
Ordinary Steel

On the basis of the theoretical study and application of ordinary steel-encased concrete composite beam, this paper will focus on a new high-strength steel-encased concrete composite beam, and mainly studies high-performance steel Q420 and Q460, as well as high-strength concrete C60 and C80. Besides, an experimental study of 5 simply-supported beams is made, and the load-deflection curves of new SCCB are analyzed. The calculation formula of load which changes with depth of section and bending strength of the cross section is also analyzed. It is suggested that the calculated results announced should be identical with the experimental results.

Effect of Repeated Quenching on the Rotating Bending Strength of SAE52100 Bearing Steel

2012 ◽  
Vol 457-458 ◽  
pp. 1025-1031 ◽  
Author(s):  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Katsuyuki Kida ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Bending Strength ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Austenite Grain ◽  
High Fatigue ◽  
Rotating Bending

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance are required. Due to its high fatigue strength, SAE 52100 is recently being used not only for the production of bearings but also shafts. Refining of prior austenite grain through repeated quenching is a procedure that can be used to enhance the material’s strength. In this work, the microstructure of repeatedly quenched SAE 52100 steel and its fatigue strength under rotating bending were investigated. It was found that repeated furnace heating and quenching effectively refined the martensitic structure and increased the retained austenite content. Repeated quenching was found to improve the fatigue strength of SAE 52100.

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