Non destructive methods for investigation of some mechanical properties of natural stones in the protection of monuments

1980 ◽  
Vol 22 (1) ◽  
pp. 59-63
Author(s):  
B. Christaras
Keyword(s):  
Mechanical Properties ◽  
Natural Stones ◽  
Non Destructive ◽  
Destructive Methods

scholarly journals DIAGNOSTICS OF THE PHYSICAL AND MECHANICAL PROPERTIES OF THE METAL BY THE PARAMETERS OF THE ELASTIC-PLASTIC INDENTATION OF A SPHERICAL INDENTER

2020 ◽  
pp. 58-62
Author(s):  
M. M. Matlin ◽  
V. A. Kazankin ◽  
E. N. Kazankina
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Spherical Indenter ◽  
Test Material ◽  
Tensile Stresses ◽  
Elastic Plastic ◽  
Plastic Indentation ◽  
Non Destructive ◽  
Destructive Methods

The paper describes non-destructive methods for determining the physical and mechanical properties of metals based on the regularities of elastic-plastic indentation of a spherical indenter into the test material. Using the proposed methods makes it possible to construct a diagram of true tensile stresses based on the results of a single indentation of a spherical indenter.

Assessment of the effect of defects on mechanical properties of adhesive bonded joints by using non destructive methods

2016 ◽  
Vol 91 ◽  
pp. 337-345 ◽  
Author(s):  
Rosanna Tamborrino ◽  
Davide Palumbo ◽  
Umberto Galietti ◽  
Patrizia Aversa ◽  
Samanta Chiozzi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bonded Joints ◽  
Adhesive Bonded Joints ◽  
Non Destructive ◽  
Destructive Methods

Potentials of the evaluation of the wood quality in living trees by using semi-and non-destructive methods in order to reduce wood-processing costs

2019 ◽  
pp. 115-126
Author(s):  
Ivana Živanović ◽  
Zoran Poduška ◽  
Ljubinko Rakonjac ◽  
Filip Jovanović
Keyword(s):  
Mechanical Properties ◽  
Wood Density ◽  
Bending Strength ◽  
Wood Quality ◽  
Renewable Resource ◽  
Relative Mass ◽  
Heterogeneous Structure ◽  
Wood Processing ◽  
Non Destructive ◽  
Destructive Methods

Being a natural, ecological and renewable resource, wood is increasingly replacing artificial and toxic materials in the manufacture of various types of packaging and other products; thus, its proper and economically justified use has become necessary. The best utilization of wood raw materials has been sought both in practice and theory, which led to the development of a number of non-destructive and semi-destructive methods for the wood quality assessments in various stages of wood exploitation. In this paper, two instruments for the inspection of the internal condition of standing trees were analyzed. The resistograph was designed for the detection of internal defects. In addition to assessing the condition of living trees of different species, the instrument is used to assess the wood density in various materials. The observed resistance during drilling is proportional to the change in the wood density or the relative mass of the element analyzed. The results of drilling in different spots or directions, through the cross-section and along the element, can be used to map the properties of the element. The fractometer is a device designed to measure the strength and other mechanical properties of on a core sample extracted by using an increment borer from a certain part of the tree or branch examined. The fractometer can determine the maximum fracture force and bending and pressure strength of wood. It is also possible to identify the stage of decay. Due to its heterogeneous structure and anisotropy, the wood compressive and bending strengths differ between different anatomical directions even within a single species. The results of previous research in the literature indicate that there is a significant positive correlation between the radial bending strength and the longitudinal compressive strength of wood. This actualizes the need for the use of different tree species in construction, depending on the load that the wood element will be exposed to. These devices provide high precision and quality in measurement and can achieve a good correlation between the measured values and the mechanical properties of wood. This way, science and practice could be provided by significant data on the properties and quality of wood, while its consumption is minimized.

Diagnostics and Monitoring of the Church of San Barbaziano in Bologna

2014 ◽  
Vol 624 ◽  
pp. 147-154 ◽  
Author(s):  
Camilla Colla ◽  
Giovanni Pascale
Keyword(s):  
Mechanical Properties ◽  
Health Monitoring ◽  
Crack Pattern ◽  
The State ◽  
Historic Center ◽  
Changes Over Time ◽  
Non Destructive ◽  
The Church ◽  
Over Time ◽  
Destructive Methods

This paper presents a diagnostic campaign carried out in an old church located in the historic center of Bologna. The campaign's objective is to evaluate the mechanical properties, the texture, the defects, and the state of preservation of the masonry. In addition, the campaign aims to assess the state of the crack pattern and monitor its changes over time. To achieve these aims several non-destructive methods and sensors have been used for structural health monitoring.

scholarly journals COMPARATIVE SURFACE DAMAGE DETERMINATION AT A JEWISH GRAVE USING TWO DIFFERENT MOBILE ULTRASONIC VELOCITY DEVICES

2017 ◽  
Vol 50 (3) ◽  
pp. 1626 ◽  
Author(s):  
B. Christaras ◽  
An. Moropoulou ◽  
M. Chatziangelou ◽  
L. Dimitraki ◽  
K. Devlioti
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Surface Damage ◽  
P Wave ◽  
University Campus ◽  
Ultrasonic Velocities ◽  
Wave Velocities ◽  
Non Destructive ◽  
Destructive Methods

The non-destructive methods are necessary in the investigation of the physical and mechanical properties of the materials in monuments. In this framework the ultrasonic velocities were used in situ for the elaboration and evaluation of the weathering on the surfaces of monuments. Additionally, the P-wave velocities were used for the estimation of the depth of weathered zone, as well as the depth of cracks at the surface of the monument. This estimation was performed on a Jewish tomb placed in the AUTH university campus between the building of Law and Economic Sciences and the Administration building, of the Aristotle University of Thessaloniki. 

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