Combining Digital Image Correlation and Thermal Measurements

abstractPL: W artykule prezentujemy metodę kalibracji, która umożliwia łączenie systemów Cyfrowej Korelacji Obrazu 3D i termografii do jednoczesnych pomiarów przemieszczeń, odkształceń i temperatury. Artykuł dotyczy wykonania modelu planszy kalibracyjnej, która działa jednocześnie w paśmie widzialnym i paśmie podczerwonym oraz metody kalibracji. Opracowany system został zaaplikowany do trzech interesujących pomiarów: monitorowanie zbiornika wypełnionego cieczą, podgrzewana płyta z plexi oraz skurcz mięści w ludzkim ramieniu.abstractEN: In this paper we present a calibration method, which enables a combining of 3D Digital Image Correlation and termographic systems for simultaneous measurements of displacements, strains and temperature. It concerns a model of a calibration target, that works for visible and infrared light spectrum and calibration method. The working system was applied for three interesting cases: monitoring of a tank filled with liquid, a heated plexi board and a human arm during muscle contraction.score: 5collation: 81-8

Application of Wedge Splitting Test for Evaluation of the Bond Strength in Repair System Alumina Cement Concrete Vs. PCC Mortar

abstractEN: There are several key factors, which are considered, when selecting methods and systemsfor concrete repair. Good bonding between repair material and concrete substrate is a crucial andsimultaneously complex phenomenon. This paper shortly presents methods used for the bondstrength evaluation with different ways of loading of bonded joints. A systems consisting of highperformance concrete substrate and two types of repair materials are investigated. The main goal ofthe work is to compare a polymer-cement modified mortar (PCC) and a rapidly setting repairconcrete (based on alumina cement). Technical characteristic of the materials as well as their bondstrength to concrete substrate are presented. Surface of concrete substrate is prepared by usingdifferent roughening techniques commonly applicable on site. Bond strength is measured bystandard pull-of test and by the wedge splitting test (WST). WST test adaptation for that purposeallows to extend the description of adhesion using fracture mechanics parameters such a work ofadhesion and fracture energyscore: 7collation: 401-40

The Quality and Reliability in the Structural Design, Production, Execution and Maintenance of the Precast Residential Buildings in Poland in the Past and Now

abstractEN: The article is a review of solutions, errors and mistakes in the project design and execution and their impact on reliability and durability of structures. Were used the results of inspections of 95 precast residential buildings situated in Warsaw, build in years 1961-1994. Inspections were made in years 2005-2006 and 2014. The summary of author researches [1,2,3,4] shows that the precast concrete prefabricated buildings can achieve real duration of use not less than 100 years. Taking into account quite good maintenance, intensive modernization and greater economic value of the housing stock in Warsaw can be assumed that their service lives may reach 120-150 years.score: 0collation: 420-43

Generating Interaction Curve Graph Based on the Rotation Angle of Strain Diagram, According to EN 1992

abstractPL: -abstractEN: The most comfortable way to present capacity is M-N interaction curve diagram (bending moment and longitudinal force). Graph of M-N most commonly appears as a function, where an axial force is the argument and the bending moment is the value. This work introduce a formation of the curve way, where the the rotation angle of the strain diagram is the argument, and the full strain diagram is the value. Using the complete state of the strain of the cross section, enables easy calculation the M-N forces using stress-strain diagram for a given material. Interaction graph is based on parabola-rectangle diagram for concrete and the graph with inclined top branch with strain limit for reinforcing steel. The method has no restrictions due to the concrete class.score: 7collation: 61-6

Ab Initio Based Modelling of Diffusion and Phase Stability of Alloys

abstractEN: In this chapter, we present the basic principles and methods for modelling of diffusion and phase stability of alloys using ab-initio methods. We review briefly first-principles methods and their most important approximations. The direct and approximated methods of prediction of migration energies are shown both for pure metals and for alloys. The cluster expansion method is described in more detail. We show that it can be applied to understand interactions in the alloys, to generate the representative structures of alloys and to predict migration barriers in alloys. We describe the methods to compute the effective cluster interactions and to assess the accuracy of the model. Finally, we present the examples of Monte Carlo simulations with parameters obtained from cluster expansion method. We show that the ordering in alloys can be predicted by the calculations of Warren-Cowley parameters. We investigate also the role of entropy in the stability of alloys at elevated temperatures.score: 0collation: 1-2

The Structure and Shape Memory of the Hot Extruded NiTi Alloy

abstractEN: The paper presents results of structural studies of hot extruded NiTi shape memory alloy that is in the B2 phase at room temperature. Texture of the alloy was determined from the X-ray diffraction measurements. It was found that in result of 60 % sample reduction (at a cross-section of a bar formed by hot extrusion) weak axial texture - type <110>B2 was formed. The volume of the grains oriented in this way was approx. 20 %. Basing on metallographic observations it was also found that the size of the grains formed as a result of the thermomechanical treatment was uniform with the average area of 1700 μm2. This information is significant from the point of view of functional properties. Hot extruded alloy revealed presence of the reversible martensitic transformation. Its characteristic temperatures were slight higher than in as-cast alloy. Moreover, the extruded NiTi alloy showed 100 % of the shape recovery.score: 0collation: 19-2

Effect of introducing recycled polymer aggregate on the properties of C-PC composites

abstractEN: The subject of this paper is the evaluation of possibility of using the plastic waste fillers as the coarse aggregate of two Concrete-Polymer Composites (C-PC): polymer-cement concrete (PCC) and polymer concrete (PC). The applied fillers were crushed high density polypropylene (HDPP) wastes remaining after grinding plastic elements used in mountings and thermal insulation systems. The substitution of natural mineral coarse aggregate (river gravel) with plastic material was done on the various levels (0- 40% in case of PCC and 0- 100% in case of PC). For all composites the density, flexural strength and compressive strength were determined and compared with those for reference composites containing only the river gravel. The results enabled to indicate the levels of possible substitution of the natural aggregate, the non-renewable resource, with waste material, so that the properties of C-PC remain at the satisfactory level. © (2013) Trans Tech Publications, Switzerland.score: 15collation: 520-52

Application of Non-Destructive Methods for Quality Control of Concrete Repair Efficiency

abstractEN: Adhesion in this system is one of the most important factors that affect the reliability anddurability of repair. According to the many standards and guidelines, e.g. new European StandardEN 1504-10 and ACI Concrete Repair Manual, a pull-off test is recommended for assessment of abond quality in repair systems. The use of pull-off test, due to its semi-destructive character, isrestricted by owners and managers. Therefore, the elaboration of reliable nondestructive method foran adhesion mapping could provide a quite advantageous alternative. Repair system is difficult totest with NDT methods, because of the many factors influencing the stress wave propagation. Inthis paper the possibility of application of various NDT methods for quality control of repairefficiency, including estimation of the bond strength, is discussed.score: 7collation: 28-3

Experimental Data Acquisition System for Flow Boiling in Mini Channels

abstractEN: The study discusses experiments on ethanol flow boiling in mini-channels. Pre-set thermal and flow parameters (pressure and temperature at the inlet, mass flux, the heat flux delivered to the heater) and temperature, pressure and void fraction measurements obtained in the experiment provided data for further simulation computations. On the basis of high-speed camera images, void fraction in the mini-channel was determined. Thermograms of the heater surface and the surface in the adiabatic part of the mini-channel allowed producing temperature profiles along the channel length. The read and computed parameters satisfy the expected dependences (especially that for void fraction as a function of volume flux and heat flux). Those were used to solve inverse heat conduction problems.score: 7collation: 263-27

Case study of stationary energy storage device in a 3 kV DC traction system.

score: 0collation: 1-