Nafion®/(organically modified silicate) nanocomposites via polymerin situsol-gel reactions: Mechanical tensile properties

2002 ◽  
Vol 40 (19) ◽  
pp. 2237-2247 ◽  
Author(s):  
S. K. Young ◽  
K. A. Mauritz
Keyword(s):  
Tensile Properties ◽  
Silicate Nanocomposites ◽  
Organically Modified ◽  
Mechanical Tensile

Biodegradable Polyester / Layered Silicate Nanocomposites

2002 ◽  
Vol 740 ◽  
Author(s):  
Pralay Maiti ◽  
Carl A. Batt ◽  
Emmanuel P. Giannelis
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Layered Silicate ◽  
Layered Silicates ◽  
Melt Extrusion ◽  
Biodegradable Polyester ◽  
Modified Montmorillonite ◽  
Organically Modified Montmorillonite ◽  
Silicate Nanocomposites ◽  
Organically Modified

ABSTRACTNanocomposites of α-hydroxy polyester, polylactide (PLA) and β-hydroxy polyester, polyhydroxybutyrate (PHB) with layered silicates have been successfully prepared by melt extrusion of PLA and PHB with organically modified montmorillonite (MMT) and fluoromica. The mechanical properties of the nanocomposites are improved compared to the neat polymers. Storage modulus increase up to 40% compared with the pure polymers by adding only 2–3 wt% nanoclay. Biodegradation can be controlled by the choice of the nanoclay used.

scholarly journals EXPERIMENTAL FINDING OF FRACTURE TOUGHNESS CHARACTERISTICS AND THEORETICAL MODELING OF CRACK PROPAGATION PROCESSES IN CARBON FIBER SAMPLES UNDER CONDITIONS OF ADDITIVE PRODUCTION

2019 ◽  
Vol 16 (33) ◽  
pp. 325-336
Author(s):  
V. N. DOBRYANSKIY ◽  
L. N. RABINSKIY ◽  
O. V. TUSHAVINA
Keyword(s):  
Fracture Toughness ◽  
Carbon Fiber ◽  
Crack Resistance ◽  
Tensile Properties ◽  
Practical Importance ◽  
Effect Of Temperature ◽  
Zone Model ◽  
Cohesive Elements ◽  
Damage Development ◽  
Mechanical Tensile

The relevance of the problem stated in this article is that the development of aerospace technology increased the demand for good quality materials. An important issue is ensuring durability in conditions of longterm loads and in conditions of damage development. One of the criteria that ensure the toughness of the material is crack resistance. The aim of the work is to study the interlayer crack resistance (fracture toughness) under loading under conditions of separation and transverse shear, interlayer strength, as well as the effect of temperature on interlayer strength, mechanical tensile properties. A comparison of the values of interlayer crack resistance GIС (separation) and GIIС (shear) and of mechanical tensile properties and interlayer strength of carbon fiber samples is made. The main methods for studying this problem were the short-beam method, the DCB method, the ENF method. The results of the experimental data were compared with modeling the processes of the appearance and development of cracks in the finite element complexes ABAQUS and Ansys based on the VVCT models, cohesive elements. Deviations from the experiment were found and conclusions were drawn that the point of application of the load had to be shifted from the edge of the sample, which will reduce the initial separation and increase the stiffness of the sample. Due to the fact that the cohesion zone model is very sensitive to input parameters, it is necessary to know many parameters and take into account a large number of factors. The practical importance of this work is to show how to use the VCCT model to obtain the critical load of the germination of the first crack. The research technique can be used for further experiments, including simulation further stratification with low inaccuracy.

The Influence of Cu/Ti Overlapping Region Microstructures on the Mechanical Tensile Properties of the Joint via Friction Stir Lap Welding

2017 ◽  
Vol 1142 ◽  
pp. 260-264 ◽  
Author(s):  
Bo Li ◽  
Yi Fu Shen ◽  
Lei Yao
Keyword(s):  
Tensile Properties ◽  
Travel Speed ◽  
Lap Joints ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Welding ◽  
Mechanical Tensile ◽  
Tool Pin ◽  
Solid State Joining ◽  
Locking Effect

The investigation on friction stir lap welding (FSLW) of dissimilar Cu and Ti is reported in this research, aiming to achieve a reliable solid-state joining and effectively control the intermetellic (IMC) formation at the lapping Cu/Ti dissimilar welded interfaces. Following the previous process optimization of the FSLW tool rotation speed and downward plunge value of the tool pin into the lower Ti sheet, the tool travel speed was further tailored for a defect-free joint. No significant Ti-Cu IMC was founded in the generated joints. After the analyses of tensile properties of the FSLW joints, the so-called mechanical locking effect of the Cu/Ti alternate band structure was further elucidated. The composite-like structure played a so-called mechanical locking effect on the Cu/Ti lap joints. The fracture resistant strength of the joint reached 95% of that of the used parent copper.

Effects of Nickel substitution by Manganese in Austenitic S.G. Cast Iron for Low-Temperature Uses

1984 ◽  
Vol 34 ◽  
Author(s):  
P. Poyet ◽  
P. Couchinave ◽  
P. I. Dancoisne
Keyword(s):  
Cast Iron ◽  
Low Temperature ◽  
Tensile Properties ◽  
Room Temperature ◽  
Manganese Content ◽  
Spheroidal Graphite ◽  
Cast Irons ◽  
Cast Material ◽  
Mechanical Tensile ◽  
High Level

ABSTRACTFor an economical purpose, an austenitic spheroidal graphite cast iron grade, containinq nickel-manganese, has been developed to replace Ni-Resist cast iron, type D2M, for cryogenic applications.Several tests were carried out to produce semi-industrial. heats of 200 kg so as to cast samples with a thickness ranging between 25 and 75 mm, and a variable nickel and manganese content. The resulting grades were compared each other and with Ni-Resist cast irons, before and after heat treatment, for their metallographic structure, their hardness, their mechanical tensile properties at room temperature and their impact values at temperatures down to - 150° C.The results show that it is possible to produce cast iron grades with 7 to 10 % manganese and 9 to 11 % nickel contents, featuring, at quenched state, better mechanical tensile properties at room temperature than Ni- Resist D2M with a 22–25 % Ni content, for roughly equivalent impact values at low temperatures. For as-cast material, the properties obtained vary with material thickness, and ductility is steeply decreasing for thicknesses under 30 mm.Weldability of Ni/Mn cast iron can be compared to Ni-Resist D2M weldability; machinability however seems more difficult, especially when boring quenched material.Generally speaking, the overall properties of these new grades and their lower cost-price if compared to Ni-Resist cast iron, should lead to promising outlets for low temperature uses and/or applications requiring high-level mechanical properties.

MECHANICAL TENSILE PROPERTIES OF AN AL-NB COMPOSITE OBTAINED BY DEFORMATION OF SHEAR UNDER PRESSURE

2021 ◽  
Vol 3 (2) ◽  
pp. 5-12
Author(s):  
R.R. Timiryaev ◽  
K.S. Nazarov ◽  
G.F. Korznikova ◽  
R.R. Kabirov ◽  
G.R. Khalikova ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Mechanical Tensile
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