Design and Application of a Tensile Testing Stage for the SEM

1974 ◽  
Vol 96 (3) ◽  
pp. 157-162 ◽  
Author(s):  
A. C. Bell ◽  
S. Ramalingam
Keyword(s):  
Fracture Resistance ◽  
Test Specimen ◽  
Tensile Specimen ◽  
Test System ◽  
Stored Energy ◽  
Axial Tensile ◽  
Testing Stage ◽  
Fracture Processes ◽  
Carbon Steel Sheet

Dynamic SEM studies of plastic flow in a uni-axial tensile test requires that the loading stage possess more than an ability to apply large loads to the test specimen. In such a test, observations of the details of the fracture processes are feasible only if the transfer of stored energy from the test system to the test specimen is minimal. This requires careful choice of test system compliance. This paper discusses system-specimen interactions and identifies the key criteria to be met for the design of satisfactory SEM tensile stages. The design and use of such a new stage is described. Preliminary results from a 0.08 percent carbon steel sheet tensile specimen are presented to demonstrate the utility of rigid tensile stages. The relevance of such tests, particularly for the characterization of the fracture resistance of test materials, is indicated.

Application of commercial test-systems to identify gram-negative facultatively anaerobic bacteria

2016 ◽  
Vol 3 (1) ◽  
pp. 43-48 ◽  
Author(s):  
V. Patyka ◽  
L. Butsenko ◽  
L. Pasichnyk
Keyword(s):  
Erwinia Amylovora ◽  
Anaerobic Bacteria ◽  
Biochemical Properties ◽  
Test System ◽  
Phytopathogenic Bacteria ◽  
Gram Negative ◽  
Test Systems ◽  
Facultatively Anaerobic ◽  
Microbiological Methods

Aim. To validate the suitability of commercial API 20E test-system (bioMerieux) for the identifi cation and characterization of facultative gram-negative phytopathogenic bacterial isolates. Methods. Conventional mi- crobiological methods, API 20E test-system (bioMerieux) according to the manufacturer’s instructions. Re- sults. The identifi cation results for Erwinia amylovora, Pectobacterium carotovorum and Pantoea agglome- rans isolates were derived from the conventional and API 20E test systems, which, were in line with the literature data for these species. The API 20E test-system showed high suitability for P. agglomerans isolates identifi cation. Although not all the species of facultatively anaerobic phytopathogenic bacteria may be identi- fi ed using API 20E test-system, its application will surely allow obtaining reliable data about their physiologi- cal and biochemical properties, valuable for identifi cation of bacteria, in the course of 24 h. Conclusions. The results of tests, obtained for investigated species while using API 20E test-system, and those of conventional microbiological methods coincided. The application of API 20E test-system (bioMerieux) ensures fast obtain- ing of important data, which may be used to identify phytopathogenic bacteria of Erwinia, Pectobacterium, Pantoea genera.

scholarly journals Influence of Fiber Orientation on Impact Resistance Behavior of Woven Sisal Fiber Reinforced Polyester Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Genetu A. Dress ◽  
M. H. Woldemariam ◽  
D. T. Redda
Keyword(s):  
Fiber Orientation ◽  
Test Specimen ◽  
Impact Resistance ◽  
Impact Testing ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Average Impact ◽  
Polyester Composite ◽  
Izod Impact

Woven natural fiber reinforced polymer composites have better tensile, flexural, and compressive strength compared to the mechanical properties of unidirectional and randomly oriented NFRPC because of the interlacing of fiber bundles. However, the characterization of impact behavior with different fiber orientation such as 30°/60°, 0/90°, 30°/−45°, and 45°/−45° woven sisal fiber reinforced polyester composite was not studied vigorously. Thus, this paper focuses on the experimental characterization of the impact resistance behavior on woven sisal fiber reinforced polyester composite materials for semistructural part by using Izod impact testing setup. The 30°/60°, 30°/−45°, 0°/90°, and 45°/−45° woven sisal fiber was prepared using nailed wooden frame as a warp and weft guider. The woven sisal fiber was impregnated in order to make woven sisal fiber dimensionally stable. Using 40% by weight of fiber and 60% by weight of polyester, the composite was developed using hand layup process. The morphology and cross-sectional elemental detection was carried out using scanning electron microscope (SEM) assessment in leather development institute (LDI). Finally, impact tests were carried out using Izod impact testing setup in Addis Ababa Science and Technology University (ASTU). The average impact strength of a 40 wt% fiber 45°/−45° woven sisal fiber reinforced unsaturated polyester composite (WSFRPC) test specimen with consecutive warp and weft tow spacing of 2 mm was 342.67 J/m and this was greater energy compared to the other orientations. But the average impact strength of a 40 wt% fiber 30°/60° WSFRPC of test specimen with consecutive warp and weft tow spacing of 2 mm was 241.33 J/m.

Characterization of fragmented structure developed during necking of iron tensile specimen

2021 ◽  
Vol 11 (4) ◽  
pp. 503-507
Author(s):  
Nikolay Zolotorevsky ◽  
Elina Ushanova ◽  
Valery Rybin ◽  
Vladimir Perevezentsev
Keyword(s):  
Tensile Specimen ◽  
Fragmented Structure

Axial Tensile Stress-Strain Characterization of a 36$rm Nb_3rm Sn$Strands Cable

2006 ◽  
Vol 16 (2) ◽  
pp. 1249-1252 ◽  
Author(s):  
Y. Ilyin ◽  
A. Nijhuis ◽  
W.A.J. Wessel ◽  
N. Van Den Eijnden ◽  
H.H.J. Ten Kate
Keyword(s):  
Tensile Stress ◽  
Stress Strain ◽  
Strain Characterization ◽  
Axial Tensile

Experimental Research on Influences on Mechanical Property of C50 Waterproof Concrete by Basalt Fiber

2013 ◽  
Vol 834-836 ◽  
pp. 755-761
Author(s):  
Hai Liang Wang ◽  
Hai Yang Guo ◽  
Xin Lei Yang ◽  
Quan Chang Ren ◽  
Peng Dong
Keyword(s):  
Mechanical Property ◽  
Experimental Research ◽  
Brittle Failure ◽  
Fracture Resistance ◽  
Test Specimen ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Experimental Results ◽  
Regular Patterns ◽  
Failure Character

The experiment discussed influences of basalt fiber with different adulterate amount to the compressive and fracture resistance properties of waterproof concrete C50. We also made comparison between experimental results and mechanical property of polypropylene fiber waterproof concrete. The experimental results demonstrated that the brittle failure character of waterproof concrete has been improved to some extent, and the compressive and fracture resistance strength of the test specimen has increased apparently after adulterating basalt fiber and polypropylene fiber. Furthermore, it is mainly unanimous of the influence regular patterns of basalt fiber and polypropylene fiber to waterproof concrete when adulterating the same amount.

Subsized Specimens for Fracture Resistance Characterisation Including Transferability Issues

2017 ◽  
Vol 741 ◽  
pp. 110-115
Author(s):  
Ivo Dlouhý ◽  
Luděk Stratil ◽  
Filip Šiška
Keyword(s):  
Fracture Resistance ◽  
Small Punch Test ◽  
Ductile Materials ◽  
Punch Test ◽  
Damage Quantification ◽  
Scaling Models ◽  
Low Constraint ◽  
Basic Approaches ◽  
Shelf Region

The contribution is focused on characterization of methods enabling to apply small/subsized specimens for fracture resistance characterization. The applied methods are divided into transition region and upper shelf region. The approaches used in the upper shelf region represent at the same time methods applicable for ductile materials without transition. Relating to subsized samples two basic approaches are applicable: (i) miniaturized samples based on common standard ones and (ii) specific specimens/methods, e.g. small punch test etc. The results described in the paper belong to the first group. For interpretation of data generated under low constraint conditions toughness scaling models and master curve approached are commented. In ductile region, either the sample used generate valid toughness characteristics, or, if not, there is no way how to correct measured data except damage quantification through micromechanical models.

Fracture Characteristics of 9%Ni Steel at Low Temperature

2015 ◽  
Author(s):  
Qingren Xiong ◽  
Chunyong Huo ◽  
Shaotao Gong ◽  
Jinheng Luo ◽  
Jiming Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Brittle Fracture ◽  
Fracture Resistance ◽  
Preparation Method ◽  
Tensile Specimen ◽  
Relative Strength ◽  
Fracture Characteristics ◽  
Brittle Fracture Resistance

The fracture characteristics of several types of tensile specimens of 9%Ni steel at low temperature was studied, and the Notch (Crack) Sensitivity and Notch (Crack) Relative Strength decreased (increased) Ratio of notch (crack) specimen were studied, while the crack preparation method of the crack specimen was discussed. The results indicate that the Notch (Crack) Sensitivity and Notch (Crack) Relative decreased (increased) Ratio can be used to evaluate the low temperature low stress brittle fracture resistance of the material. 9%Ni steel has good brittle fracture resistance at low temperature. The crack preparation principle of the crack tensile specimen was put forward.

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