scholarly journals Rancang Bangun Alat Bantu Panjat Pohon Kelapa

2021 ◽  
Vol 19 (2) ◽  
pp. 150
Author(s):  
Baso Nasrullah ◽  
Syaharuddin Rasyid ◽  
Muh. Rachmat Fajrin ◽  
Arwandis Arwandis
Keyword(s):  
Tensile Strength ◽  
Maximum Force ◽  
Maximum Tensile Strength ◽  
Coconut Tree ◽  
Sense Of Security ◽  
The Moment ◽  
Aluminum Material

The design of coconut tree climbing aids purposes to make it easier and provide a sense of security to climb trees even though they do not have climbing skills. This tool uses a 2024 series hollow aluminum material which has a maximum tensile strength of 302 MPa which is able to withstand a force of 7097Nmm which is greater than the maximum force that occurs which is 2000Nmm. This material has the ability to withstand a moment of 450.282Nmm greater than the moment that occurs of 100,000 Nmm, so the operator is safe without worry breaking. The testing of this tool has been proven to make it easier for humans who do not have climbing skills to a height of 6 m while those who have skills to climb coconut trees without tools can only reach a height of 3 m. this is because climbers who have skills still feel awkward using coconut tree climbing aids. So it can be concluded that this climbing aid is safe and even people who do not have climbing skills can climb coconut trees safely.

scholarly journals The Study of Male-Female Chamfer Angle Effect on Aluminum 6061 Forging at Rotary Friction Welding Process

2021 ◽  
Vol 65 (2) ◽  
pp. 61-67
Author(s):  
Anugra Fikri Azmi ◽  
◽  
Yohanes Yohanes ◽  
Ridwan Ridwan Abdurrahman ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Friction Welding ◽  
Welding Process ◽  
Specimen Length ◽  
Maximum Tensile Strength ◽  
A Value ◽  
Rotary Friction Welding ◽  
Angle Effect ◽  
Aluminum Material

This research aims to investigate male-female chamfer angle effect on forging pressure, specimen length and the maximum tensile strength in splicing 6061 aluminum material, which used the rotary friction welding process. This research employed the analytical method to determine the timing of forging pressure as an initial reference to conduct the experimental study for the specimens test. The specimens were tested by varying the male-female chamfer angle, namely 0°, 15°, 30°, 45°, 60°. The results test were obtained the longest application of forging pressure at the male-female chamfer angle of 60° and the fastest application of forging pressure at the male-female chamfer angle of 15°. The change in length of the specimen during the welding process for each variation of the male-female chamfer angle varies due to the friction time different. The largest change in length was at the male-female chamfer angle of 15° and the smallest change in length at the male-female chamfer angle of 60°. The maximum tensile strength was obtained at the variation of male-female chamfer angle of 60° with a value of 226.47 MPa.

scholarly journals II. The elastic limits of iron and steel under cyclical variations of stress

1911 ◽  
Vol 210 (459-470) ◽  
pp. 35-55 ◽  
Keyword(s):  
Tensile Strength ◽  
Yield Stress ◽  
Simple Relation ◽  
Iron And Steel ◽  
Maximum Tensile Strength

Introduction . Since Wöhler’s original experiments on the fracture of iron and steel by repetition of stress, similar experiments have been made by independent observers, and all agree in showing that neither the maximum tensile strength nor the yield stress hears any simple relation to the range of stress which may be safely repeated. The only theory of fatigue, i . e . of failure due to repetition of stress, which has received serious attention was put forward by Bauschinger. According to this theory, specimens subjected to repetitions of stress begin to be fatigued when the stresses applied in each cycle are so great that the extension of the specimen is not wholly elastic.

scholarly journals The Optimum Process Parameter of Dissimilar Metal AA6061 – AISI304 Continuous Drive Friction Welding

2020 ◽  
Vol 55 (2) ◽  
Author(s):  
Totok Suwanda ◽  
Rudy Soenoko ◽  
Yudy Surya Irawan ◽  
Moch. Agus Choiron
Keyword(s):  
Tensile Strength ◽  
Response Surface ◽  
Process Parameters ◽  
Friction Welding ◽  
Welding Parameters ◽  
Optimum Process ◽  
Dissimilar Metals ◽  
Maximum Tensile Strength ◽  
Friction Pressure ◽  
Welding Processes

This article explains the use of the response surface method to produce the optimum tensile strength for the joining of dissimilar metals with the continuous drive friction welding method. The joining of dissimilar metals is one of the biggest challenges in providing industrial applications. Continuous drive friction welding has been extensively used as one of the important solid-state welding processes. In this study, the optimization of the friction welding process parameters is established to achieve the maximum tensile strength in AA6061 and AISI304 dissimilar joints via the response surface methodology. The effect of continuous drive friction welding parameters, which are friction pressure, friction time, upset pressure, and upset time, are investigated using response surface analysis. The design matrix factors are set as 27 experiments based on Box-Behnken. The 3D surface and the contour is plotted for this model to accomplish the tensile strength optimization. The optimization model of the tensile strength was verified by conducting experiments on the optimum values of the parameters based on the experimental data results. It can be denoted that the optimum process parameters settings were friction pressure = 25 MPa, friction time = 6 seconds, upset pressure = 140 MPa, and upset time = 8 seconds, which would result in a maximum tensile strength of 228.57 MPa.

scholarly journals Manufacturing Technique of Heat-Insulating and Flame-Retardant Three-Dimensional Composite Base Fabrics

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800
Author(s):  
Jia-Horng Lin ◽  
Chen-Hung Huang ◽  
Ching-Wen Lin ◽  
Ching Wen Lou
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Melting Point ◽  
Flame Retardant ◽  
Three Dimensional ◽  
Weight Ratio ◽  
Air Permeability ◽  
Maximum Tensile Strength ◽  
Manufacturing Technique ◽  
Pu Foam

In this research, we create a PET/TPU/PU composite base fabric from a PET nonwoven base fabric, a TPU honeycomb grid, and a PU foam plank. First, the PET base fabric is made from 7D three-dimensional-hollow-crimp fiber (7D PET) and low-melting-point (low-Tm) fibers with weight ratio and number of lamination layers as the parameters. The hardness and rebound resilience rate of the PET nonwoven base fabric are 71% and 63.5%, respectively. The PET nonwoven base fabric's optimum air permeability is 240 cm3/s/cm2. The maximum tensile strength of the PET nonwoven base fabric with 9 layers of lamination is 39.8 kg/cm2, and when the weight ratio is either 4:6 or 3:7, changes to 40 kg/cm2. The PET/TPU/PU composite base fabric has a LOI of 33 when the number of lamination layers is 10, or when the low-Tm fiber content is 50%; the composite base fabric's average optimum thermal conductivity is 0.914 W/mK.

Design-of-experiments application in the friction stir welding of aluminium alloy AA 8011-h14 for structural application

2019 ◽  
Vol 16 (3) ◽  
pp. 606-622
Author(s):  
Navneet Khanna ◽  
Mahesh Bharati ◽  
Prachi Sharma ◽  
Vishvesh J. Badheka
Keyword(s):  
Tensile Strength ◽  
Aluminium Alloy ◽  
Tensile Testing ◽  
Visual Inspection ◽  
Welding Parameters ◽  
Nugget Zone ◽  
Content Type ◽  
Taguchi Analysis ◽  
Friction Stir ◽  
Maximum Tensile Strength

Purpose The demand for aluminium alloys has been increasing in almost all the fields. In this study, the friction stir welding (FSW) of similar aluminium alloy AA 8011-h14 has been presented using three levels of tool rotational speed (n), tool tilt angle (ϴ) and tool feed (f). The purpose of this paper is to study the effect of welding parameters on various properties and time-temperature plots. Design/methodology/approach FSW was carried out using the L-9 orthogonal array of welding parameters generated using the Taguchi approach. Visual inspection and radiography testing were conducted to detect the surface and volume defects, respectively. Taguchi analysis was carried out to get optimised welding parameters for tensile testing. The microstructural analysis was carried out for the specimen possessing maximum tensile strength and the obtained grain structures were compared with the microstructure results of the base material. The peak process temperatures were noted and time-temperature plots were analysed for the varying parameters. The maximum value of hardness was recorded and analysed. Findings Visual inspection and radiography testing confirmed defect-free joints. The maximum tensile strength achieved was 84.44 MPa with 64.95 per cent efficiency. The optimised parameters obtained using Taguchi analysis for tensile testing were 1,500 rpm, 1° and 50 mm/min. Microstructure analysis for the specimen possessing maximum tensile strength revealed fine and equiaxed grains in the nugget zone. Time-temperature plots suggested the maximum temperature of 389 °C on the advancing side. A maximum hardness value of 36.4 HV was obtained in the nugget zone. Originality/value As per the knowledge of the authors, this study is the first attempt for the detailed experimental analysis on the FSW of this particular aluminium alloy AA 8011-h14.

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