Temat: impact strength - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The effect of multiple processing of polypropylene on selected properties of injection moulded parts
Autorzy:: Głogowska, K.
Sikora, J. W.
Dulebová, L.
Tematy:: strength test
polypropylene
hardness
impact strength
injection moulding; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102128.pdf Link otwiera się w nowym oknie
Opis:: An injection moulding machine was used to produce injection moulded parts from polypropylene under invariant injection moulding conditions. Part of the injection mouldings were shredded and re-processed up to fifteen times. The mouldings and the shredded plastic were tested for selected strength properties: Young’s modulus, maximum tensile stress, breaking stress, strain at maximum stress, strain at break, Shore hardness, impact strength, mass flow rate, and longitudinal and transverse shrinkage. Relevant relationships were identified and conclusions were drawn on the basis of the data obtained.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The influence of selected adhesive properties and the manner of surface preparation upon impact strength of block adhesive joints
Autorzy:: Komorek, A.
Godzimirski, J.
Tematy:: adhesive joint
impact strength
adhesive properties; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243591.pdf Link otwiera się w nowym oknie
Opis:: The research described in this article is part of investigating impact strength in block adhesive joints. The authors checked experimentally the effect, on the test results, of the manner of surface preparation and compressive strength and Young’s modulus of an adhesive used to make the connection. The experimental testing was carried out with an impact pendulum tool, designed to examine adhesive joints. During such testing, the energy used to tear off the upper part of the specimen, that is the energy lost by the dropping device, is the measure of the impact strength of an adhesive connection. The elements of the samples were made with an aluminum alloy 2017A. In the investigations, the authors used non-normative samples whose upper element was a cylinder rather than a cuboid, as advised in the norm. The adhesive joints were made using epoxy adhesive Loctite, named EA 3421, or an adhesive composition Epidian 57 with Z1 hardener. The glued elements were prepared by treating the surfaces for bonding by means of the stream-abrasive processing. The abrasive mediums were three types of materials of different gradation. In addition, two series of samples were prepared using roughening by sandpaper. For control samples, the authors made joints, in which the surfaces for bonding became degreased merely by petroleum ether. The results of the experimental studies indicate that the impact strength of adhesive joints is dependent on the manner of preparation of the bonded elements as well as on the longitudinal modulus of elasticity of the adhesive, which was used to make the connection.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical model of plastic destruction of thick steel structural elements
Autorzy:: Kowalski, J.
Kozak, J.
Tematy:: impact strength
numerical modeling
steel structural elements; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259652.pdf Link otwiera się w nowym oknie
Opis:: In the shipbuilding industry, the risk of brittle fracture of the structure is limited by using certified materials with specified impact strength, determined by the Charpy method (for a given design temperature) and by supervising the welding processes (technology qualification, production supervision, non-destructive testing). For off-shore constructions, classical shipbuilding requirements may not be sufficient. Therefore, the regulations used in the construction of offshore structures require CTOD tests for steel and welded joints with a thickness greater than 40 mm in the case of high strength steel and more than 50 mm in the case of other steels. Classification societies do not accept CTOD test results of samples with a thickness less than the material tested. For this reason, the problem of theoretical modeling of steel structure destruction process is a key issue, because laboratory tests for elements with high thickness (in the order of 100 mm and more) with a notch are expensive (large samples, difficulties in notching), and often create implementation difficulties due to required high load and range of recorded parameters. The publication will show results and conclusions from numerical modeling of elastic properties for steel typical for offshore applications. Calculations were carried out at the Academic Computer Centre in Gdańsk.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Impact of Microorganisms on Mechanical Properties Changes of Composite Materials with Sawdust as Organic Filler
Autorzy:: Mazur, Piotr
Szuszkiewicz, Jarosław
Tematy:: polymer
composite
organic filler
microorganisms
impact strength
polyethylene; Pokaż więcej
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie
Powiązania:: https://bibliotekanauki.pl/articles/1835545.pdf Link otwiera się w nowym oknie
Opis:: The beginning of the XXIst century is characterized by rapid development of polymer materials, including polymer composite materials, which consist of a natural organic filler (wood flour, sawdust, cellulose fiber, flax fiber, sisal fiber) and reinforcement carrier (polymer). In case of that kind of the fillers under the influence of weathering (humidity, temperature) they might be subject to biodegradation due to effect of microorganisms, including funguses, which are responsible for degradation of natural organic fillers. In case of the low melting temperature polymers (e.g. PE-LD) the processing temperature does not entirely eliminate some of the fungal spores. The paper has presented the research results of twelve months. The development of the microorganisms in the natural conditions was examined in a pure filler (sawdust) as well as in a composite. Simultaneously, change of one of the fundamental strength properties, which is the impact strength, was being tested. For the investigated composite the PE-LD as the matrix and a sawdust mixture of pine, larch and oak were used. The sawdust formed the composite in 30% vol. The research results confirmed that in the natural conditions the microorganisms development depends on weathering which varies in the time of the year. The value of the V notch impact strength changed from 12.5 kJ/m2 for the composite in initial phase to the value of 6.7 kJ/m2 after twelve months operation, which is close to 54%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Spheroidal Cast Iron for Works at Low Temperature - Requirements, Structure, Properties, Control of the Production Process
Autorzy:: Zych, Jerzy
Jurga, T.
Mocek, Jan
Myszka, Marcin
Snopkiewicz, Tomasz
Tematy:: impact strength
ferritic ductile iron
low temperatures
work-of fracture; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2125548.pdf Link otwiera się w nowym oknie
Opis:: Two standardised grades of spheroidal cast iron determined in standard EN PN 1563 - 1997 as: EN-GJS-350 - 22LT (T = –40°C) and EN GJS 400 - 18LT (T = –20°C) are intended for work at low temperatures: –20 and –40oC. The main mechanical property of these cast iron grades is a high impact strength at a work temperature down to: –40°C. A series of controlled melts was performed to optimise the production technology of spheroidal cast iron, which in as-cast state is characterised by ferritic matrix (the best without any pearlite), fine precipitates of nodular graphite and high purity (without non-metallic inclusions). Variable structures of metal charges and various spheroidisation techniques (the modification methods) (slender ladle with a tight cover - Tundish technology as well as the technology with cored wire) were applied in the research. In order to obtain refinement of graphite precipitates and to achieve the ferritic matrix multistage inoculations of technologies were applied. Cast iron was subjected to refining to limit non-metallic inclusions since they decrease the impact strength. The production process of cast iron was controlled by the thermal derivative analysis at the stage of initial cast iron and after its secondary metallurgy (modification and inoculation). It was pointed out, that the reproducible production of cast iron for work at low temperatures was only possible when all elements of the technological process were strictly adhered to. It was pointed out, in the hereby paper, that: it should be strived to maintain Si content not higher than 2.50÷2.60%, which at producing spheroidal cast iron is sometimes difficult and requires using a lot of pig iron in the metal charge. For a fast assessment of the cast iron quality, concerning its impact strength, the proposed - in the hereby paper - index quality (IQu) can be applied. It is determined on the bases of measuring the cast iron hardness and propagation velocity of ultrasound wave.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Effect of Adding Halloysite Nanotubes as Filler on the Mechanical Properties of Low-Density Polyethylene
Autorzy:: Fic, Jakub
Dulebová, Ľudmila
Hájek, Jaroslav
Głogowska, Karolina
Wydawca:: Trans Tech Publications Ltd
Opis:: Reinforcing thermoplastic polymers with nanotubes or nanoplatelets to form nanocomposites is a way to increase the usage of polymeric materials in engineering applications by improving their mechanical properties. The contribution presents the results of research from basic processing and mechanical properties of nanocomposites. Low-Density Polyethylene (LDPE) was used as a matrix for experiments. The material LDPE was modified by Halloysite nanotubes (HNT) with a mass share of 2, 4, 6 wt% of the matrix LDPE. Nanocomposites were filled with 5 wt% Polyethylene grafted with maleic anhydride (PE-graft-MA) as a compatibility factor. The specimens were prepared by injection molding and their selected mechanical properties were tested by static tensile test, Charpy impact test and Shore hardness test.
European Union
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 7.

Tytuł:: Próba ilościowego opisu wpływu parametrów obróbki cieplnej na udarność stali narzędziowej 102Cr6
Attempt at quantitative description of the influence heat treatment parameters have on impact strength of 102Cr6 tool steel
Autorzy:: Poprzeczka, A.
Lisica, A.
Tematy:: stal narzędziowa
obróbka cieplna
udarność
tool steel
heat treatment
impact strength; Pokaż więcej
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Powiązania:: https://bibliotekanauki.pl/articles/310017.pdf Link otwiera się w nowym oknie
Opis:: Parametry obróbki cieplnej stali narzędziowej w istotny sposób wpływają na jej strukturę, która z kolei kształtuje właściwości mechaniczne i eksploatacyjne, takie jak np.: twardość, udarność i odporność na zużycie ścierne. Pomimo licznych opracowań na ten temat brak jest w literaturze fachowej ścisłych zależności pomiędzy parametrami obróbki cieplnej stali narzędziowej a jej odpowiednimi właściwościami. W niniejszej pracy przedstawiono próbę zbadania ilościowego wpływu parametrów obróbki cieplnej na udarność stali 102Cr6 stosowanej na narzędzia do pracy na zimno. Do badań i opracowania wyników zastosowano pełnoczynnikową macierz planowania doświadczeń 2³i program komputerowy Statistica.
Heat treatment parameters of the tool steel significantly affect its structure which in turn shapes such mechanical and operating properties as: hardness, impact strength and wear resistance. In spite of numerous studies in this subject, specialist literature does refer to close dependencies between heat treatment parameters of tool steel and its adequate properties. This paper presents an attempt at quantitative analysis of the influence heat treatment parameters have on the impact strength of 102Cr6 steel used on cold work tools. The analysis and result handling were performed with the use of the 2³ full-factor experiment design matrix and Statistica software.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of the properties of orthotropic composites in terms of their use in airframe repairs
Analiza właściwości kompozytów ortotropowych w aspekcie zastosowania w naprawach płatowców
Autorzy:: Arkuszyńska, Angelika
Godzimirski, Jan
Rośkowicz, Marek
Tematy:: orthotropic composite
mechanical properties
impact strength
kompozyt ortotropowy
właściwości mechaniczne
udarność; Pokaż więcej
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/31232967.pdf Link otwiera się w nowym oknie
Opis:: The aim of the research was to determine the basic strength properties of orthotropic composites in terms of their use in the repair of aircraft airframes. The objects of the tests were three types of composites reinforced with carbon fibers: producedusing the wet method with a thickness of 2.5 mm, commercial with a thickness of 2 mm and commercial with a thickness of 7.3 mm. Specimens cut out from the first two types of materials were subjected to a static tensile test with a force applied in the direction of the fibers and at an angle of 45°, whichenabled the determination of tensile strength and modulus of elasticity. Specimens made of 7.3 mm thick composite were subjected to four-point bending and tensile tests to determine Young's modulus, compression and impact strength, also taking into account two directions of load application. The values of stresses and Young's modulus determined in this way indicate much lower strength and stiffness of orthotropic composites apart from the reinforcement fibers’ directions, which is the basis for replacing them with quasi-isotropic composites in repairs of aircraft airframes.
Celem badań było wyznaczenie podstawowych właściwości wytrzymałościowych kompozytów ortotropowych w aspekcie wykorzystania ich w naprawach płatowców statków powietrznych. Obiektami badań były trzy rodzaje kompozytów zbrojonych włóknami węglowymi: wytworzony metodą na mokro o grubości 2,5 mm, komercyjny o grubości 2 mm oraz komercyjny o grubości 7,3 mm. Próbki wycięte z dwóch pierwszych rodzajów materiałów poddano statycznej próbie rozciągania siłą przyłożoną w kierunku ułożenia włókien oraz pod kątem 45°, co umożliwiło wyznaczenie wytrzymałości na rozciąganie oraz modułów sprężystości podłużnej. Próbki wykonane z kompozytu o grubości 7,3 mm poddano czteropunktowemu zginaniu oraz próbom rozciągania w celu określenia modułu Younga, ściskania oraz wytrzymałości udarnościowej także z uwzględnieniem dwóch kierunków przyłożenia obciążenia. Wyznaczone w ten sposób wartości naprężeń oraz modułów Younga wskazują na znacznie mniejszą wytrzymałość i sztywność kompozytów ortotropowych poza kierunkami ułożenia włókien zbrojenia, co stanowi podstawę do zastąpienia ich kompozytami quasi-izotropowymi w naprawach płatowców statków powietrznych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of fibre loading and surface treatment on the impact strength of coir polyester composites
Autorzy:: Karthikeyan, S.
Tematy:: coir fibre
polymer composites
impact strength
włókno kokosowe
kompozyty polimerowe
udarność; Pokaż więcej
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:: https://bibliotekanauki.pl/articles/2175809.pdf Link otwiera się w nowym oknie
Opis:: Purpose: In this work, coir fibre with varying fibre content was selected as reinforcements to prepare polymer-based matrices and the problem of reduced fibre-matrix interfacial bond strength has been diluted by chemical treatment of coir fibres with alkali solution. Design/methodology/approach: The effect of fibre loading, solution concentration and soaking time on the impact strength of the composites were analyzed using statistical techniques. Response Surface Methodology (RSM) approach was used to model and optimize the impact properties of coir-polyester composites. Findings: The impact strength of coir fibre reinforced polyester composite depends mainly on the fabrication parameters such as fibre-polyester content, soaking time, concentration of soaking agent and adhesive interaction between the fibre and reinforcement. Research limitations/implications: The mechanical properties of any coir polyester composite depend on the nature bonding between the fibre and reinforcement. The presence of cellulose, lignin on the periphery of any natural fibre reduces the bonding strength of the composite. This limitation is overcome by fibre treatment over sodium hydroxide to have better impact properties. Practical implications: Now days, natural fibre reinforced composites are capable of replacing automotive parts, subjected to static loads such as engine Guard, light doom, name plate, tool box and front panels etc. These materials can withstand any static load due to its higher strength to weight ratios. Originality/value: The effect of fibre loading, solution concentration and soaking time on the impact strength of the composites were analyzed using statistical techniques. Response Surface Methodology (RSM) approach was used to model and optimize the impact properties of coir-polyester composites. The impact strength of NaOH impregnated coir fibre reinforced polyester composites was evaluated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Evaluation of Impact Strength and Microstructure as Quality Criteria for Selected Materials
Autorzy:: Maj, M.
Pietrzak, K.
Lasota, P.
Tematy:: steel
cast iron
hardness
microstructure
impact strength
stal
żeliwo
twardość
mikrostruktura
wytrzymałość; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/379533.pdf Link otwiera się w nowym oknie
Opis:: The article presents the results of analysis of the chemical composition, hardness, microstructure and toughness of selected structural materials. The focus is on the results of impact tests carried out on the 40H steel quenched and tempered at three different temperatures, on grey cast iron used in industrial practice (cast material for brake drums) and on ADI, all of them being considered representatives of the group of materials commonly used in the production of structural elements and finished products, including items for use in the automotive industry. The impact tests were performed at a reduced temperature (-20°C), at room temperature (20°C) and at elevated temperature (150°C), comparing the results obtained with the microstructure of materials tested. It has been shown that in the case of steel, the smallest changes in microstructure cause changes in toughness, while the effect of tempering temperature is in this case of secondary importance. It was also proved that under the conditions of ambient temperature and reduced temperature, better results were obtained for ADI. At elevated temperature, better results were obtained for grey iron castings.
Dostawca treści:: Biblioteka Nauki

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