Bauschinger effect at elevated temperatures in a 2024-T3 aluminum alloy for designing wind turbine components

In the present study, monotonic tension tests and low cycle fatigue tests were performed on aluminum alloy EN AW-2024-T3 under various operating temperatures. The results were assessed in order to determine the Bauschinger effect in the aluminum alloy under elevated temperatures. Findings of monotonic tests served as a basis to compare the influence of temperature on mechanical properties of the material. The results of the cyclic tests were used to determine the Bauschinger effect. Finally, the changes in the presence of the effect at various testing temperatures were presented. © 2017 Carl Hanser Verlag, München

Strain-based damage accumulation model for low cycle fatigue

W pracy przedstawiono propozycję modelu obliczania trwałości zmęczeniowej elementów konstrukcyjnych w warunkach złożonych obciążeń, w zakresie małej liczby cykli. Prezentowane podejście składa się z dwóch bloków obliczeniowych. Pierwszy służy do wyznaczania składowych tensora naprężenia i odkształcenia. Zawiera związki konstytutywne i prawo kinematycznego wzmocnienia. Wykorzystano w nim wielopowierzchniowy model Mroza. W drugim bloku znajdują się zależności określające zmianę miary kumulacji uszkodzeń oraz kryterium pękania. W modelu kumulacji uszkodzeń wykorzystano podejście związane z przyrostem plastycznych odkształceń postaciowych na płaszczyźnie fizycznej.The paper presents the description of damage accumulation for analysis of fatigue life of structural elements under non-proportional loading states. The numerical algorithm consists of two calculation blocks. First presents method for calculation components of stress and strain tensors using multisurface hardening rule proposed by Mróz. Those components have been used for calculation of fatigue life in second block. Increment of damage accumulation has been addicted from increment of shear strain on physical plane

between room temperature and 300 degrees C for designing VAWT components

In the present study, the results of the monotonic tension tests and low cycle fatigue tests performed on aluminium alloy EN AW-2024-T3 under various operating temperatures are presented in order to assess the fatigue behaviour of the aluminium alloy under evaluated temperatures. Monotonic tests were performed to determine the influence of temperature on mechanical properties of the material. The aim of cyclic tests was to acquire the parameters required for Manson-Coffin equation in order to plot strain-fatigue life curves. Moreover, stress-strain behaviour of the alloy and the cyclic hardening behaviour were evaluated using Ramberg-Osgood equation. Finally, P-SWT-damage parameters for each temperature have been calculated for further investigation of the effects of the temperature on fatigue life using acquired data while taking the account of mean stress effect into calculations. Variations in the experimental data due to various test temperatures are presented for both monotonic and cyclic tests

for designing wind turbine components

In the present study, monotonic tension tests and low cycle fatigue tests were performed on aluminum alloy EN AW-2024-T3 under various operating temperatures. The results were assessed in order to determine the Bauschinger effect in the aluminum alloy under elevated temperatures. Findings of monotonic tests served as a basis to compare the influence of temperature on mechanical properties of the material. The results of the cyclic tests were used to determine the Bauschinger effect. Finally, the changes in the presence of the effect at various testing temperatures were presented

Monotonic mechanical properties of titanium grade 5 (6Al-4V) welds made by microplasma

The research concerned the possibility of using the microplasma welding technique for joining thin titanium alloy Grade 5 (6Al-4V) sheets. For this purpose, titanium reference samples without welds (Type 1) and two types of welded joints (butt joint - Type 2 and Type 3 overlap joint) were made with selected microplasma welding parameters for which strength parameters were determined and compared with the strength of the native material. The assessment of the connection quality was made on the basis of a monotonic tensile test. A metallographic analysis of the welded joints was made and the breakthroughs sample obtained during the tests was also carried out. In addition, strain distributions were determined in loaded sample types, which allowed investigating the impact of the heat affected zone size on the strength of welded joints subjected to monotonic tensile tests and Vickers hardness tests. Microplasma welded joints displayed relatively high brittleness. The failure locations are still influenced by heat affected zone despite the highly concentrated plasma beam of the microplasma arc welding. © 2018 Elsevier Lt

for packaging labels

In this study, experimental tests based on monotonic tension of specimens made from several types of heat shrinkable films with various overprints were performed. Basic strength parameters of films were determined, such as Young's modulus, yield stress, tensile strength, and tensile strain at tensile strength. The effects of both the type of film and the type of overprint on the aforementioned parameters were studied. Earlier results of tests on similar materials, known in the literature, were referred to, and similarities and differences were pointed out. Film heat-shrinkability tests at temperatures 70, 80, 95 degrees C were also conducted, indicating certain patterns between the material's mechanical properties and the degree of shrinkage

Monotonic mechanical properties of titanium grade 5 (6Al-4V) welds made by microplasma (vol 100, pg 27, 2019)

The authors regret ‘The wrong number of grant was given at paper. Should be: The investigation described in this paper is part of the research project no. 2017/01/X/ST7/01092 Sponsored by the National Science Centre, Poland and realized in Bialystok University of Technology’. The authors would like to apologise for any inconvenience caused. © 2020 Elsevier Lt

A New Method for Estimating the Clamping Force of Shrink Sleeve Labels

The paper presents an original method for estimating the shrink sleeve label compressive force on packaging. One of the most popular methods of measuring deformations was used, i.e., the electrical resistance strain gauge measurement. It was assumed that the packaging was a thin-walled axially symmetrical vessel. The packing walls on one side are loaded with internal pressure generated by heating the liquid contained inside the packaging. On the other side, the film shrinking on the packaging generates additional deformation. By measuring the changes in circumferential deformations in the shrinking process at various packaging heights, it is possible to infer the uniformity of the film compressive force. Results of research on changes of these deformations over time with different intensity values of the shrinkage medium were presented

Experimental investigation of thin films with various overprints used for packaging labels

In this study, experimental tests based on monotonic tension of specimens made from several types of heat-shrinkable films with various overprints were performed. Basic strength parameters of films were determined, such as Young's modulus, yield stress, tensile strength, and tensile strain at tensile strength. The effects of both the type of film and the type of overprint on the aforementioned parameters were studied. Earlier results of tests on similar materials, known in the literature, were referred to, and similarities and differences were pointed out. Film heat-shrinkability tests at temperatures 70, 80, 95 °C were also conducted, indicating certain patterns between the material's mechanical properties and the degree of shrinkage. © 2017 Elsevier Lt