Determination of the physic and mechanical characteristics of isotropic pyrolitic graphite by dynamic indentation method

2014 ◽  
Vol 50 (7) ◽  
pp. 419-425 ◽  
Author(s):  
A. P. Kren ◽  
T. A. Protasenya
Keyword(s):  
Mechanical Characteristics ◽  
Dynamic Indentation ◽  
Indentation Method

scholarly journals Diagnostics of steel structures with the dynamic non-destructive method

2019 ◽  
Vol 279 ◽  
pp. 02003 ◽  
Author(s):  
Alexey Beskopylny ◽  
Andrey Veremeenko ◽  
Alexander Shilov
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Steel Structures ◽  
Dynamic Indentation ◽  
Lower Strength ◽  
Indentation Method ◽  
Element Analysis ◽  
Railway Bridges ◽  
Non Destructive

The method of the assessment of steel structures mechanical properties is considered with the nondestructive test by conical indentation. The nondestructive evaluating of the steel mechanical properties in real structures is widely spread in many applied problems. Dynamic indentation method is one of the most effective because of compatibility and accuracy. For this purpose, the static and dynamic problem of axisymmetric elastic-plastic truncated cone indentation is solved, and the results are compared with finite element analysis and experimental data. The method of nondestructive evaluating of mechanical characteristics is suggested and devise of the realization of the method is tested at real structures. The method is tested on steel railway bridges that are being operated for more than 60 years. As a result, zones with lower strength values were identified, and recommendations for strengthening the design were given.

scholarly journals Evaluation of the error of indirect measurements of physical-mechanical characteristics of materials by dynamic indentation method

2020 ◽  
Vol 65 (4) ◽  
pp. 487-495
Author(s):  
O. V. Matsulevich ◽  
A. P. Kren ◽  
T. A. Pratasenia ◽  
M. N. Delendik
Keyword(s):  
Elastic Modulus ◽  
Measurement Error ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Strain Hardening Exponent ◽  
Dynamic Indentation ◽  
Indentation Method ◽  
Indirect Measurements ◽  
Accuracy Of Measurements ◽  
Wide Range

The metrological problems of measuring the physic and mechanical characteristics of materials by dynamic indentation are considered. It is shown that the estimation of measurement error demanding the creation of the reference blocks is ineffective due to the wide variety of controlled materials and a wide range of changes in their properties. A technique has been developed for evaluating the accuracy of measurements based on the errors of individual parameters included in the calculation equation, i.e. by determining the error of indirect measurements. The technique is based on the estimation of the boundaries of the random error of the measured characteristics of the material and the non-excluded systematic errors of the parameters that are used for the calculations of needed characteristics. The results of experimental studies are presented, indicating that due to the different character of the dependencies of hardness and elastic modulus, the error in measuring the elastic modulus exceeds the error in measuring hardness. In addition, it was found that the error in measuring the characteristics of materials by the dynamic indentation method exceeds the measurement error by the static indentation method and can be reduced by increasing the accuracy of the equipment used for the registration of impact process. The obtained values of the physic and mechanical characteristics of the materials and the values of the measurement error show that the dynamic indentation method can effectively solve the problem of non-destructive testing of hardness, elastic modulus, and strain hardening exponent of metals and products with an appropriate error.

Combined determination of the mechanical characteristics of polymer films

1968 ◽  
Vol 1 (5) ◽  
pp. 84-87
Author(s):  
O. F. Shlenskii ◽  
N. N. Khovanskaya ◽  
V. V. Lavrent'ev
Keyword(s):  
Polymer Films ◽  
Mechanical Characteristics

scholarly journals Effect of type cement on the mechanical strength of copper slag mortars

2013 ◽  
Vol 66 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Amin Nazer ◽  
Osvaldo Pavez ◽  
Ithamar Toledo
Keyword(s):  
Environmental Impact ◽  
Flexural Strength ◽  
Construction Industry ◽  
Mechanical Characteristics ◽  
Copper Slag ◽  
Cement Mortars ◽  
Alternative Material ◽  
Binder Type ◽  
Initial Resistance

Copper slag is a massive metallurgist waste. Annual production rises up to 24.6 million tons, approximately, and the main environmental impact derived from slag disposal is the usage of great soil extensions and the resulting visual contamination of the landscape. Along time, copper slag has been used in the manufacture of concrete and cement mortars. Thus, with the aim of verifying binder-type influence in the final hardness of mortars, two types of cement were used: regular cement and high initial resistance cement. Copper slag was characterized from the chemical, mineralogical and grading viewpoints. Official Chilean regulations were used in the applied methodology for the determination of some important slag parameters. Compression and flexural strength trials were carried out on cement mortars in specialized laboratories. The obtained results showed that mortars manufactured with copper slag presented a better resistance to compression and flexural strength than mortars manufactured with normal sand, and those made with high initial resistance cement were even better. It can be concluded from this work that copper slag offers optimal mechanical characteristics to be used in the manufacturing of cement mortars, becoming a sustainable and adequate alternative material for usage in the construction industry.

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