Bend testing of powder strip wound on a cylinder of variable curavature

1995 ◽  
Vol 33 (3-4) ◽  
pp. 181-185
Author(s):  
A. I. Otrok ◽  
I. V. Meleshko
Keyword(s):  
Bend Testing ◽  
Powder Strip

Study of Bismuth Telluride Crystal Strength

2019 ◽  
pp. 1-8
Author(s):  
A. A. Gorbatovskiy
Keyword(s):  
Tensile Strength ◽  
Bismuth Telluride ◽  
Elasticity Modulus ◽  
Testing Machine ◽  
Bend Testing ◽  
Instron Testing Machine ◽  
Measurement Results ◽  
Strength Tests ◽  
Semiconductor Properties

The article presents results of strength tests of bismuth telluride prismatic samples obtained by growing crystals. These crystals have semiconductor properties and are used in the heat machines, the run-ability of which largely depends on the strength of crystals. Data available in the literature are significantly different from each other. It has been shown that, the most consistent strength tests results are obtained in case of bend testing. The measurement results of the elasticity modulus and tensile strength are given. For tests, an INSTRON testing machine with maximum direct stress of the 1000 H was used.

An alternative bend-testing technique for a flexible indium tin oxide film

Displays ◽  
2010 ◽  
Vol 31 (4-5) ◽  
pp. 191-195 ◽  
Author(s):  
Yen-Liang Chen ◽  
Hung-Chih Hsieh ◽  
Wang-Tsung Wu ◽  
Bor-Jiunn Wen ◽  
Wei-Yao Chang ◽  
...  
Keyword(s):  
Oxide Film ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Testing Technique ◽  
Bend Testing

scholarly journals The Effect of AC (alternating current) and DC (direct current) on Bend Testing Results of Low Carbon Steel Welding Joints

Teknomekanik ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 56-61
Author(s):  
Zetri Firmanda ◽  
Abdul Aziz ◽  
Bulkia Rahim
Keyword(s):  
Carbon Steel ◽  
Direct Current ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Alternating Current ◽  
Bend Test ◽  
Open Crack ◽  
Low Carbon ◽  
Bend Testing ◽  
Welding Joints

The purpose of this study was to determine the effect of alternating current (AC) and direct current (DC) on the bend testing results of low carbon steel welding joints. The results of this study are expected to determine the cracks that occur from the root bend and face bend testings in the AC and DC welding process. This study used experimental method, where the research was done by giving AC and direct polarity DC (DC-) SMAW welding treatments. The material used in this research was low carbon steel plate DIN 17100 Grade ST 44, thickness 10 with E7016 electrode type. The process of welding joints used a single V seam, strong current of 90A, and the welding position of 1G. The testing of welding joints was carried out by bend testing using the standard acceptance of AWS D1.1 root bend and face bend testing results. The results of the bend testing showed that the AC welding root bend test specimen held no cracks while the DC welding root bend test held cracks with incompelete penetration and open crack defects. On the contrary, the AC welding face bend test had open crack defects and in the DC welding face bend test was found a crack. Thus, there was a difference in the crack resistance of the welding joint from the types of current used through the root bend test and face bend test. Therefore, it can be summarized that AC welding is better for root welding and DC welding is good for capping welding.

Bend testing of micro-scale bulk metal specimens using a chip-scale test instrument

2015 ◽  
Vol 2015 (DPC) ◽  
pp. 000827-000864
Author(s):  
Li-Anne Liew ◽  
David T. Read ◽  
Nicholas Barbosa
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Flexural Stiffness ◽  
Bulk Materials ◽  
Test Chip ◽  
Bend Testing ◽  
Micro Scale ◽  
The Past ◽  
Test Instrument ◽  
Size Scales

We describe bend testing on micro-scale specimens of 302 stainless steel, using a MEMS test instrument. Bend testing is a common way of measuring the flexural stiffness of structural materials across many size scales, from thin laminate sheets to large weldments. Whereas the stiffness of a material under tensile loading is given by the Young's Modulus, the flexural stiffness, or the stiffness in bending, is much lower. In the past two decades, conventional materials testing machines and the specimens themselves have undergone miniaturization for the purpose of evaluating the mechanical properties of miniaturized mechanical components such as sensors and biomedical implants, for which the smallest specimen dimension is typically around 1 mm [2]. Another driver for miniaturizing the testing apparatuses is to test materials with inherently small form factors such as wires and thin films [3]. Now the emerging 3D printing technology is creating another need for material property measurement at micrometer size scales, to accurately capture the property gradients resulting from the layered manufacturing. However, with ever increasing miniaturization comes increasing difficulty in specimen handling, gripping, and alignment. Concurrently, MEMS technology has been used over the past 2 decades to fabricate small actuators and sensors for mechanical testing of materials of thin films [4] or nanoscale materials such as nanowires. We seek to use the advantages of MEMS to study the mechanical properties of bulk materials rather than thin films, but at the micrometer scale. We believe this will result in greater accuracy and spatial resolution of property measurements of structural materials used in civil infrastructure, aerospace, transportation and energy industries, as well as characterizing manufacturing processes that lead to steep property gradients such as 3D printed components. Our approach is to use MEMS actuators as chip-scale re-useable test instruments into which small specimens sectioned from bulk materials can be inserted and tested [5], to reduce the cost and time to obtain large data sets and to allow the measurements to be done in-situ in harsh environments. We will describe the design of a micro-size 302 stainless steel specimen, and the use of a MEMS test instrument for performing the bend testing on the specimens. The specimen's gage section was 350 um long, 65 um wide and 25 um thick, and was made by lithographic etching of a foil. The MEMS test instrument was fabricated from silicon and glass wafers. The specimens were inserted into the MEMS test chip and the silicon actuator applied static bending loads to the specimen. Displacements were measured from optical microscope images, and the force was calculated from the applied voltage and the known (measured) stiffness of the silicon actuator. The applied force from the MEMS actuator was measured directly, without any specimen, using a custom table-top force probe and load cell apparatus, and was in agreement with the force calculated from the applied voltage. The flexural stiffness of the micro specimens were measured, using the MEMS test device, at 90 – 130 N/m. These values were validated by independently testing the specimens with the much larger table-top force probe. We thus show that our MEMS test chip can be used to perform bending tests on micro scale specimens of bulk materials, but with a 1000-fold reduction in size compared to table-top force-measuring apparatuses.

Bend Testing of Parts Made by Rapid Prototyping with Respect to Possible Use in Robotics

2015 ◽  
Vol 760 ◽  
pp. 141-146 ◽  
Author(s):  
Jan Lipina ◽  
Václav Krys ◽  
Jiří Marek
Keyword(s):  
3D Printing ◽  
Rapid Prototyping ◽  
Experimental Determination ◽  
Internal Structure ◽  
Detailed Knowledge ◽  
3D Printer ◽  
Bend Strength ◽  
Bend Testing ◽  
Material Parameters

Recently, the Rapid Prototyping technology (RP hereafter) has been increasingly used for a final product, which requires detailed knowledge of designing parts made by the RP technology. In order to apply parts made by the RP technology in robotics, and design in general, in a wider range, one of the most important material parameters is their bend strength. The paper describes an experimental determination of bend strength in parts printed on a 3D printer. The parts were made of polycarbonate. The tests were carried out in parts with various types of internal structure. The achieved results can be implemented when designing parts made by 3D printing provided that professional printers are used.

Physicomechanical properties and microstructure of roll-compacted copper powder strip

1974 ◽  
Vol 13 (11) ◽  
pp. 917-921
Author(s):  
O. A. Katrus ◽  
A. V. Aleshina ◽  
A. V. Perepelkin
Keyword(s):  
Copper Powder ◽  
Physicomechanical Properties ◽  
Powder Strip
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