A Simple Extensometer for Tensile Testing of Polymers

1958 ◽  
Vol 31 (3) ◽  
pp. 673-679
Author(s):  
A. E. Eagles ◽  
A. R. Payne
Keyword(s):  
Conventional Method ◽  
Tensile Testing ◽  
Considerable Increase ◽  
Mechanical Device

Abstract The prototype extensometer, which has now been in constant use for over a year, gives satisfactory results which compare favorably with those of the conventional method. The use of this extensometer, which is a simple mechanical device, robust and reliable in operation, removes the last obstacle from autographic recording of tests using dumbbell specimens, thus permitting a considerable increase in speed of tensile testing.

Development of a New Measurement System for Tensile Testing

2010 ◽  
Author(s):  
O. Ancelet ◽  
Ph. Matheron
Keyword(s):  
Aluminum Alloy ◽  
Tensile Test ◽  
Conventional Method ◽  
Measurement System ◽  
Tensile Testing ◽  
Curvature Radius ◽  
Local Behavior ◽  
Great Precision ◽  
Minimum Diameter ◽  
Alloy 6061

The aluminum alloy 6061-T6 is a material used for some part of experimental reactor for its interesting physical and mechanical proprieties. To respect the European rules on pressure equipments, a material must present some minimal characteristics for toughness and ductility. In this frame, a new measurement system for tensile testing was developed in the LISN laboratory of the CEA (French atomic commission), in order to characterize the local behavior of the material during a whole tensile testing. Indeed, with the conventional measurement system (typically an extensometer), the local behavior of the material can only be determinate during the stable step of the testing. So, usually the behavior of the material during the necking step of the step is unknown. This new measurement is based on the use of some laser micrometers which allow measuring the minimum diameter of the specimen and the curvature radius during the necking phase with a great precision. Thanks to the Bridgman formula, we can evaluate the local behavior of the material until the failure of the specimen. For example, the application of this new measurement system on tensile test allow to determine the behavior of the Mod.9Cr-1Mo until a strain of 130% while the conventional method can not determine the behavior up to 10% corresponding to the initiation of necking.

3D printed micro-mechanical device (MMD) for in situ tensile testing of micro/nanowires

2019 ◽  
Vol 33 ◽  
pp. 100575 ◽  
Author(s):  
Yuejiao Wang ◽  
Libo Gao ◽  
Sufeng Fan ◽  
Wenzhao Zhou ◽  
Xiang Li ◽  
...  
Keyword(s):  
Tensile Testing ◽  
Mechanical Device ◽  
3D Printed ◽  
In Situ Tensile Testing

Design Method of Spring Balance Mechanism Through Derivation of General Solution

2019 ◽  
Vol 31 (2) ◽  
pp. 305-316 ◽  
Author(s):  
Kazuki Kaneda ◽  
Hirokazu Yamagata ◽  
Toshio Morita ◽  
◽  
Keyword(s):  
General Solution ◽  
Conventional Method ◽  
Design Method ◽  
Solution Space ◽  
Design Solution ◽  
Trial And Error ◽  
Mechanical Device ◽  
Spring Balance ◽  
Design Solutions ◽  
Balance Mechanism

The present study set out to devise a means of designing a spring-balance mechanism (hereinafter, a SBM) based on a general solution. The goal was to apply a general solution as a guideline for identifying the optimum design solution. A SBM is used to reduce the actuator output in the design of a mechanical device. As a result, the effect of gravity can be offset and energy-saving in operation can be realized. To date, however, SBMs have been designed on a trial and error basis, with a reliance on the designer’s knowledge or experience. Thus, in some instances, it may not be possible to identify a design solution that should, in theory, be achievable. To overcome this issue, this study examined the application of a general solution to the design of a SBM. Such a general solution would identify a solution space including viable design solutions. Subsequently, once a design that satisfies the general solution had been identified, a search could be made of all the design solutions within the solution space. First, the sequence whereby the general solution is used to identify a SBM design that satisfies the general solution, thus providing a guideline for the search action, is determined. Herein, the method used to identify this initial SBM design is presented. The devised method is based on the description of an energy-conservation formula that does not involve any trial and error. The proposed method incorporates a conventional method into the design solution, which can be derived when the conventional method cannot identify a design solution. As a result, a design method using a general solution for the design of an SBM is realized.

THE EFFECT OF APPLYING SQ3R METHOD ON STUDENTS’ ACHIEVEMENT IN READING COMPREHENSION

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Pranata Royganda Sihaloho And Masitowarni Siregar
Keyword(s):  
Reading Comprehension ◽  
Research Design ◽  
Conventional Method ◽  
Experimental Research ◽  
T Test ◽  
Control Group ◽  
Multiple Choice Tests ◽  
Choice Tests ◽  
And Control ◽  
Experimental Group

The aim of this study is to discover the effect of applying SQ3R method inreading comprehension. Experimental research design is used as the research method.This research took place at SMA Nasrani 2Medan. There were 2 classes chosen as thesample with 30 students in each class. The classes were divided into two groups namelyexperimental and control group. The experimental group was taught by using SQ3Rmethod and the control group was taught by using conventional method. The instrumentused to collect the data was a set of multiple choice tests, which divided as pre test andpost test. The result of the research was analyzed by using t-test formula. The resultshowed that t-test was higher than t-table (4,23>2,00) at the level of significant 0,05with degree of freedom (df) 58. It means that hypothesis alternative (Ha) is acceptedwhich shows that SQ3R method significantly improves the student’s readingcomprehension.

DESIGN OF A MECHANICAL DEVICE FOR REDUCING NOISE AND ISSUANCE OF GAS AND PARTICLES FOR DIESEL ENGINES FROM AN ENERGY GENERATING ENGINE

2018 ◽  
Author(s):  
Herivaldo Pascoal ◽  
Domingos Sávio Tavares Mendes Junior ◽  
ANTONILSON CONCEIÇÃO ◽  
Yves Bandeira ◽  
Carlisson Azevedo ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Mechanical Device

Body Effect Measurement in DRAM Cell Transistor Using Memory Test System

2016 ◽  
Author(s):  
Ilwoo Jung ◽  
Byoungdeok Choi ◽  
Bonggu Sung ◽  
Daejung Kim ◽  
Ilgweon Kim ◽  
...  
Keyword(s):  
Conventional Method ◽  
Cell Body ◽  
Test System ◽  
Memory Test ◽  
Effect Measurement ◽  
Nondestructive Measurement ◽  
Individual Values ◽  
Body Effect ◽  
Sample Damage ◽  
Viable Method

Abstract Body effect is the key characteristic of DRAM cell transistor. Conventional method uses a TEG structure for body effect measurement. But this measurement is not accurate, because TEG structure has only several transistors and it is located outside of the DRAM die. This paper suggests a viable method for measuring DRAM cell transistor body effect. It uses a memory test system for fast, massive, nondestructive measurement. Newly developed method can measure 100,000 DRAM cell body effects in two minute, without sample damage. The test gives one median value and 100,000 individual values of body effects. Median value of measured body effects is equal to the TEG body effect. An individual DRAM cell body effect has a correlation with the fin height.

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