Statistical Evaluation Tensile Properties of High-Density Polyethylenes

2012 ◽  
Vol 445 ◽  
pp. 213-218 ◽  
Author(s):  
Ahmet Koyun ◽  
Baris Koksal ◽  
Esma Ahlatcioglu ◽  
A. Binnaz Hazar Yoruc

The mechanical properties, among all the properties of plastic materials, are often the most important properties because virtually all service conditions and the majority of end-use applications involve some degree of mechanical loading [1]. In the present work three different commercial polyethylene materials are tensile tested at four or five different tensile rates and two or three temperatures. Tensile test results against tensile rate include stress at 0.5 % elongation, tensile strength, yield strength, modulus of elasticity, elongation at yield and % elongation are determined. It is concluded that the structure, chain lengths and branching rates of polymer matrix significantly effected tensile test curve characteristic.

2014 ◽  
Vol 887-888 ◽  
pp. 824-829
Author(s):  
Qing Fang Lv ◽  
Ji Hong Qin ◽  
Ran Zhu

Laminated veneer lumber is taken as an object of study, and use LVL specimens of different sizes for compression test and tensile test. The goal of the experiment is to investigate the size effect on compressive strength and tensile strength as well as the influence of the secondary glued laminated face, which appears in the secondary molding processes. The results show that both compressive strength and tensile strength have the size effect apparently and the existence of the secondary glued laminated face lower the compressive strength of LVL specimens. Afterwards, the relationship between compressive strength and volume along with tensile strength and area are obtained by the test results.


2011 ◽  
Vol 682 ◽  
pp. 49-54
Author(s):  
Bin Chen ◽  
Chen Lu ◽  
Dong Liang Lin ◽  
Xiao Qin Zeng

The Mg96Y3Zn1 alloy processed by equal channel angular pressing has been investigated. It was found that the Mg96Y3Zn1 alloy processed by ECAP obtained ultrafine grains and exhibits excellent mechanical properties. After ECAP, the average grain size of Mg96Y3Zn1 alloy refined to about 400 nm. The highest strengths with yield strength of 381.45MPa and ultimate tensile strength of 438.33MPa were obtained after 2 passes at 623K. It was found that cracks were preferentially initiated and propagated in the interior of X-phase during the tensile test. As a result, the elongation of alloy is decreased with pass number increasing.


2010 ◽  
Vol 152-153 ◽  
pp. 1083-1087
Author(s):  
Bo Wang ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Gang Chen ◽  
Xiao Nong Cheng

In-situ (Al2O3+Al3Zr)p/A356 composites were synthesized by melt reaction technology and the effects of yttrium on microstructure and mechanical properties of the composites are investigated. The results indicate that the reinforced particulates Al2O3 and Al3Zr become smaller in size with yttrium addition, the sizes are about 0.5~2μm. The distribution becomes more homogeneous, the morphologies are spheroid-shape and ellipsoid-shape, the ambitus is blunt. The mechanical properties test results show the mechanical properties of the composites are greatly enhanced. With 0.4wt.% yttrium addition, the ultimate tensile strength and yield strength of the composites reach to 388MPa and 296MPa, which are increased 35.6% and 37.0% comparing with no yttrium addition, respectively. The effect mechanisms of yttrium are discussed.


Author(s):  
Rizal Hanifi ◽  
Gebyar Dewangga ◽  
Kardiman Kasiadi ◽  
Eri Widianto

Research has been carried out on the analysis of mechanical properties and simulation of composite failure of oil palm midrib fiber polypropylene matrix as car bumpers. This research is expected to provide information on the results of testing the mechanical properties and physical properties and to find out the results of failure simulation in stress analysis based on static test using Inventor Professional 2015 software. Composite boards are made using the hot press method with three variations volume fraction is 20% fiber: 80% matrix, 30% fiber: 70% matrix and 40% fiber: 60% matrix. Characterization of composite physical properties in the form of density, swelling, and water uptake while mechanical properties in the form of tensile testing. Composite physical test results showed that composites made according to JIS A5908 (2003) composite tensile test results showed that the maximum tensile strength obtained at the volume fraction of 40% fiber: 60% matrix with a value of 21.106 MPa, followed by a decrease in tensile strength in volume fraction 30% fiber: 70% matrix and 20% fiber: 80% matrix. Increased tensile strength due to direct orientation of fibers and the addition of fiber composition. Composites are still worth making bumper because the value of tensile strength is no less than the standard bumper which is 8,09 MPa. Next, failure simulation results based on a static test uses three variations of speed, namely 60 km/hr, 80 km/hr and 100 km/hr. The failure simulation results based on the static test of the three speed variations show the value of the von misses stress below the yield strength of the material, then the displacement value that occurs is small and the value of the safety factor produced is above one. From the results of the analysis of composite testing, it shows that the composite has the potential to be a car bumper material.Telah dilakukan penelitian tentang analisis sifat mekanik dan simulasi kegagalan komposit serat pelepah kelapa sawit matriks polypropylene sebagai bumper mobil. Penelitian ini diharapkan dapat memberi informasi hasil pengujian sifat mekanik dan sifat fisis serta mengetahui hasil simulasi kegagalan dalam stress analysis berdasarkan static test menggunakan software Inventor Professional 2015. Papan komposit dibuat menggunakan metode hot press dengan tiga variasi fraksi volume yaitu 20% serat: 80% matriks, 30% serat: 70% matriks dan 40% serat: 60% matriks. Karakterisasi sifat fisis komposit berupa densitas, swelling, dan serapan air sedangkan sifat mekanik berupa pengujian tarik. Hasil pengujian fisis komposit menunjukkan bahwa komposit yang dibuat sesuai dengan klasifikasi JIS A5908. Hasil pengujian tarik komposit menunjukkan bahwa nilai kekuatan tarik maksimal yang paling besar diperoleh pada fraksi volume 40% serat: 60% matriks dengan nilai 21,106 MPa, diikuti penurunan kekuatan tarik pada fraksi volume 30% serat: 70% matriks dan 20% serat: 80% matriks. Meningkatnya kekuatan tarik dikarenakan orientasi serat searah dan penambahan komposisi serat. Komposit masih layak dibuat bumper karena nilai kekuatan tariknya tidak kurang dari standar bumper yaitu 8,09 MPa. Selanjunya, hasil simulasi kegagalan berdasarkan static test menggunakan tiga variasi kecepatan yaitu 60 km/jam, 80 km/jam dan 100 km/jam. Hasil simulasi kegagalan berdasarkan static test dari ketiga variasi kecepatan tersebut menunjukkan nilai von misses stress dibawah nilai yield strength yang dimiliki material, kemudian nilai displacement yang terjadi kecil serta nilai safety factor yang dihasilkan yaitu di atas satu. Dari hasil analisis pengujian komposit tersebut menunjukkan bahwa komposit berpotensi sebagai material bumper mobil


2007 ◽  
Vol 546-549 ◽  
pp. 391-394
Author(s):  
Ding Fei Zhang ◽  
Li Ping Ren ◽  
Hong Ju Zhang ◽  
Wei Yuang

Developing new alloys and techniques is important for the applications of magnesium alloy products. The greatest challenge in the area is to exploit new wrought magnesium alloys[1]. In this paper, the effects of Zn addition on the microstructures and mechanical properties of the MZK60 wrought alloy which is modified from ZK60 have been investigated. The microstructures of these alloys at various states were evaluated by optical microscopy. The mechanical properties at room temperature of these alloys were studied systematically by tensile test. Experimental results indicated that increasing Zn content to 7~10%wt is able to get not only higher tensile strength and yield strength, but also higher elongation.


2012 ◽  
Vol 192-193 ◽  
pp. 95-100
Author(s):  
Tian Bao Li ◽  
Zhao Yang ◽  
Bing Li ◽  
Yu Long Ye

Hypo/hyper-eutectic Al-Si bi-metal composite parts were prepared by the strain-induced melt activated (SIMA) thixo-forging. The interfaces of the bi-metal composites were observed using OM, and SEM. The tensile strength and hardness of the matrix alloys and the bonding strength at the interface were assessed by tensile test and micro-indent test. Results show that the eutectic structure joined together on the interface under the pressure. However, there are some defects such as holes and impurities were found near the interface. The tensile test samples were broken in Al-20 wt. % Si matrix. The bonding strengths at the interfaces were higher than 80 MPa. Results show that the hardness gradually increasing from 55 HV in Al-7 wt. % Si alloy to 180 HV in Al-20 wt. % Si alloy, which demonstrate the composite interface transited smoothly. The composite interface has an average hardness of 80 HV.


2020 ◽  
Vol 991 ◽  
pp. 17-23
Author(s):  
Agung Setyo Darmawan ◽  
Pramuko Ilmu Purboputro ◽  
Agus Yulianto ◽  
Agus Dwi Anggono ◽  
Wijianto ◽  
...  

Nodular cast iron is a type of cast iron with spheroid graphite surrounded by ferrite matrix and / or pearlite. The size of the graphite and its matrix affects the mechanical properties of the cast iron. This research was conducted to investigate the effect of Magnesium composition on strength, stiffness and toughness of nodular cast iron. Magnesium addition is performed by adding FeSiMg alloys. After that, the composition of magnesium was investigated by using spectrometry. Then tensile test was conducted to obtain the yield strength, tensile strength and modulus of elasticity. Further, impact test was performed to determine the impact energy needed to break the material. The result showed an increase of yield strength, tensile strength and stiffness and a decrease of toughness.


2017 ◽  
Vol 894 ◽  
pp. 21-24 ◽  
Author(s):  
S.Nю Ab Rahim ◽  
Mohd Amri Lajis

In the present work, aluminum AA6061 chip metals were extruded by hot extrusion and the effect of extrusion parameters on the mechanical properties and surface integrity were investigated. The objective of the present studies it to analyze the mechanical and structural properties of 6061 after plastic consolidation by hot extrusion. Tensile test results showed that material extruded using temperature 550°C exhibit higher ultimate tensile strength (UTS) compared with temperature of 400°C. Fracture surfaces shown that ductile fracture mode occurred at condition 500°C and 2 hours, and brittle fracture occurred at condition 400°C.


2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040035
Author(s):  
Xiang Cai ◽  
Yanxin Qiao ◽  
Baojie Wang ◽  
Huiling Zhou ◽  
Yuxin Wang

The influence of rolling on nanomechanical and mechanical behavior of Mg-7Li alloy was investigated by nanoindentation, tensile test and scanning electron microscopy (SEM), respectively. The [Formula: see text]-Mg phase elongated along the rolling direction and gradually cracked. As the rolling ratio increased from 3 to 10, the hardness of [Formula: see text]-Mg and [Formula: see text]-Li phase increased by 7.35% and 20.75%, respectively. The fracture of alloys changed from ductile fracture to quasi-cleavage fracture. The yield strength and ultimate tensile strength increased by 23 MPa and 12 MPa, respectively, while elongation reduced by 12.5%.


2017 ◽  
Vol 12 (1) ◽  
pp. 31
Author(s):  
Nisfayati Juir ◽  
Rahmi Rahmi ◽  
Marlina Marlina

Pembuatan film khitosan berikatan silang epiklorohidrin telah dilakukan dengan metode inversi fasa. Pada penelitian ini khitosan dimodifikasi dengan epiklorohidrin untuk memperbaiki sifat mekanik dan ketahanannya terhadap asam. Film khitosan hasil modifikasi diuji sifat mekaniknya dengan alat uji tarik dan daya serapnya diuji terhadap ion Cd2+. Hasil uji tarik menunjukkan bahwa dengan adanya pembentuk ikat silang epiklorohidrin  pada khitosan dapat meningkatkan tensile strength film khitosan dan optimum pada komposisi 54,128 % b/b. Hasil uji adsorpsi terhadap ion Cd2+ menunjukkan bahwa penambahan epiklorohidrin dapat meningkatkan kapasitas penyerapan ion Cd2+ sebesar 31,33 %  dibandingkan dengan film khitosan tanpa silang.  Preparation of epichlorohydrin crosslinked  chitosan film has been done by phase inversion method. In this study, chitosan was modified with epichlorohydrin by the purpose of improving its  mechanical properties and adsorption capasity. Mechanical properties of crosslinked chitosan film was examined by tensile test. Adsorption study was done for Cd2+ ions removal. Tensile test results showed  epichlorohydrin as crosslinking agent of chitosan can improve tensile strength and optimum at 54.128 % w/w of composition. The adsorption results for Cd2+ ions showed the addition of epichlorohydrin in chitosan can increase the adsorption capacity of Cd2+ ions 31,33 % compared with non-crosslinked chitosan films.


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