نتایج جستجو برای: hardness strength

تعداد نتایج: 229077  

Journal: :journal of dental biomaterials 0
na. taha department of conservative dentistry, jordan university of science and technology, irbid, jordan a. ghanim oral health cooperative research centre, melbourne dental school, the university of melbourne, australia ms. tavangar department of dental materials, school of dentistry, shiraz university of medical sciences, shiraz, iran

statement of problem: there are controversial reports regarding physical and mechanical properties of resin composites and glass ionomer cements. some revealed higher strength and hardness for resin composites while others showed a comparable value for glass ionomer cements. evaluation of mechanical properties of different types of resin composites in comparison with resin modified glass ionome...

2008
Peter Höller Reinhard Fromm

The shear strength plays an important role in avalanche formation. However, investigations on shear strength in the field are time-consuming, in particular these measurements require experienced avalanche professionals. Main objective of this study was to estimate shear strength by using indirect methods which are more user-friendly than the traditional tests. We assumed that hardness and densi...

2017
Stefan Bürgin Nadja Rohr Jens Fischer

BACKGROUND Aim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging. METHODS Four cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to al...

Journal: :journal of dental biomaterials 0
salman khaje masoud jamshidi

abstract statement of problem: mechanical strength and durability of dental composites are the main topics studied in this field of science today. this study examined fumed silica-based composite as a strong and durable restorative material through flexural and cycling test methods.     objectives: the purpose of this study was to evaluate the effect of silanization, ageing, cycling and hybridi...

Journal: :international journal of advanced design and manufacturing technology 0
seyyed amin torabi advanced materials research center, department of materials engineering, najafabad branch, islamic azad university, najafabad, iran kamran amini advanced materials research center, department of materials engineering, najafabad branch, islamic azad university, najafabad, iran department of mechanical engineering, tiran branch, islamic azad university, isfahan, iran *corresponding author masab naseri research & development, isfahan casting industries, isfahan, iran

in this study, in order to investigate the effect of increasing the manganese content on microstructure and mechanical properties of high manganese austenitic steels, three alloys with successive increases in weight percentages of manganese (7.55, 13.1, and 16.5) and carbon (0.8 and 1.2) were cast in the presence of a constant amount of chromium (1.5 wt.%) and silica (0.6 wt.%). the samples exp...

Journal: :Journal of environmental management 2014
Y X Zhao H K Shon S Phuntsho B Y Gao

This study is the first attempt to investigate the effect of total hardness and ionic strength on coagulation performance and the floc characteristics of titanium tetrachloride (TiCl4). Membrane fouling under different total hardness and ionic strength conditions was also evaluated during a coagulation-ultrafiltration (C-UF) hybrid process. Coagulation experiments were performed with two simula...

2017
Bhargav Naik Somil Mathur

s: Aim: The aim of this research work was to compare and evaluate the hardness and flexural strength of three different commercially available fixed provisional restorative resins. Objective: The objectives of this research work are, to assess whether setting mechanism of fixed provisional restorative resins has an effect on the physical and mechanical properties and to compare and contrast the...

Journal: :نشریه دانشکده فنی 0
احسان شجاعی مهدی دیواندری سید محمد علی بوترابی

in the present work, the effect of aluminum content, austenitizing temperature and austempering time and temperature on the mechanical properties and hardness of fe-c-al grey cast iron was investigated. for this purpose, three alloys containing 1, 2 and 4 weight percent of aluminum were provided. the tensile samples were austenitized at 850?c and 900?c for 120 min, followed by austempering proc...

Volume fraction of fibres (A), aspect ratio of fibres (B) and fibres orientation (C) are considered as control factors in the determination of hardness strength, hardness strength of plantain fiber reinforced polyester composites (PFR P). These properties were determined for plantain empty fruit bunch (PEFB) and plantain pseudo stem (PPS). Hardness tests were conducted on the replicated samples...

Journal: :journal of ultrafine grained and nanostructured materials 2014
alireza abdollahi ali alizadeh

in this study, ultrafine grained 2024 al alloy based b4c particles reinforced composite was produced by mechanical milling and hot extrusion. mechanical milling was used to synthesize the nanostructured al2024 in attrition mill under argon atmosphere up to 50h. a similar process was used to produce al2024-5%wt. b4c composite powder. to produce trimodal composites, milled powders were combined w...

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