Search results for "structural"

On the use of the EMI for the health monitoring of bonded elements

2014

The low weight, robustness and fatigue resistance of adhesive joints make them suitable for structural joints. A fully developed nondestructive evaluation technique however is needed to monitor and assess the quality of bonded joints. In the present paper the application of the electromechanical impedance (EMI) technique is proposed. In the EMI method a piezoelectric transducer (PZT) is attached to the structure of interest. The high sensitivity and low power consumption make the EMI method feasible for real time structural health monitoring. In this study we investigated the sensitivity of the electromechanical response of a PZT to the curing and the quality of the adhesive used for bonded…

Analysis of FBG reflection spectra under uniform and non-uniform transverse loads

2019

Loads applied transversely on the external surface of waveguides change their circular cross-sectional geometry generating birefringence. Due to this effect the reflected spectrum of a Fibre Bragg grating (FBG) undergoes a splitting of the single peak of the Bragg wavelength. In this work, we employed the Transfer Matrix Method (TMM) for x- and y-polarized wave-modes to model the uniform FBG reflection spectra for uniform and non-uniform transverse loads. We also performed experimental measurements for two different transverse load scenarios. The load profiles chosen for these experiments were applied on the FBG sensor through a block of steel and a roll bearing pin. Then, the modelled and …

RILEM TC 279 WMR round robin study on waste polyethylene modified bituminous binders: advantages and challenges

2022

inter-laboratory experiments were designed to evaluate the impact of plas- tic waste blended directly in bitumen and to assess the properties, using conventional and advanced bituminous binder testing. The blends tar- geted 5% of plastic waste in 95% bitumen, using two types of polyethy- lene (PE) primary (pellets) and secondary (shreds) waste. The experiments showed that the addition of PE waste to bitumen does not alter the chem- istry of the bitumen, the blending is physical. The DSR results indicate a strong dependency on the testing temperature as at low temperatures the composite material bitumen and PE behave both elastically whereas, at higher temperatures, the bitumen becomes visco…

Weathering of low-density polyethylene grafted with itaconic acid in laboratory tests

2011

Polyethylene grafted with itaconic acid was subjected to weathering under laboratory accelerated conditions. The course of the photo-oxidative degradation process of that material was studied by FTIR spectroscopy both through quantitative measurements of changes in absorbance values at selected wave numbers and through measurements of surface area values for absorption bands which were separated by means of deconvolution. The use of both those procedures of quantitative determinations resulted in a general conclusion that the oxidation process was initiated from the very first moment of irradiation, and it produced ketones, acids, esters (intramolecular and of acetate type), peracids, peres…

The pentafluorophenyl group as π-acceptor for anions: a case study

2015

Chemical science 6(1), 354-359 (2015). doi:10.1039/C4SC02762K

Mobile - käyttöliittymä Michel Butorin tekstikoneeseen

2014

"The best thing is laughing at our differences" : intercultural couples' views on their relationship and its effects on the construction of identities

2016

Vaikka monikulttuuristen avioparien määrä on kasvussa niin Suomessa kuin muuallakin maailmassa, heitä on kielitieteissä tutkittu suhteellisen vähän. Monikulttuuriset, ja samalla usein monikieliset parit ovat ainutlaatuisessa asemassa identiteetin rakentumisen kannalta; monikulttuurisissa avioliitoissa elävät ihmiset elävät jatkuvasti kahden erilaisen kulttuurin ja kahden tai useamman kielen ympäröiminä. Kaikki tämä puolestaan vaikuttaa heidän identiteettiensä rakentumiseen. Tämä tutkimus perustuu poststruksturaaliseen käsitykseen identiteettien rakentumisesta. Sen mukaan ihmisellä voi olla useita erilaisia identiteettejä, jotka muokkaantuvat vuorovaikutuksessa muiden ihmisten kanssa. Avioli…

Powinności kształcenia językowego w L1 a niektóre aspekty lingwistyki poststrukturalistycznej

2022

The article is a part of the discussion on language education in L1 in a modern school. The vision presented in it is based on poststructuralist linguistic concepts, in which language is perceived in a non-systemic way, giving it a humanistic, anthropological-subjective, and cognitive dimension. The author discusses three good practice proposals as examples that fit into the presented didactic concept: in the first, writing character profiles was considered a story that interprets oneself and the world, in the second dictionary-phraseological exercises were assigned the function of changing the perception of reality, the third is an attempt to create a methodology based on the achievements …

Comparison of Post-Weld Treatment of High-Strength Steel Welded Joints in Medium Cycle Fatigue

2010

This paper presents a comparison of three post-weld treatments for fatigue life improvement of welded joints. The objective is to determine the most suitable post-weld treatment for implementation in mass production of certain crane components manufactured from very high-strength steel. The processes investigated are: burr grinding, TIG dressing and ultrasonic impact treatment. The focus of this investigation is on the so-called medium cycle area, i.e. 10 000-500 000 cycles and very high stress ranges. In this area of fatigue design, the use of very high strength steel becomes necessary, since the stress range can exceed the yield-strength of ordinary structural steel, especially when consi…

Numerical and Experimental Study of a Novel Concept for Hydraulically Controlled Negative Loads

2016

This paper presents a numerical and experimental investigation of a novel concept that eliminates oscillations in hydraulic systems containing a counterbalance valve in series with a pressure compensated flow supply. The concept utilizes a secondary circuit where a low-pass filtered value of the load pressure is generated and fed back to the compensator of the flow supply valve. The novel concept has been implemented on a single boom actuated by a cylinder. A nonlinear model of the system has been developed and an experimental verification shows good correspondence between the model and the real system. The model is used for a parameter study on the novel concept. From the study it is found…