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Dynamic Mechanical Behaviour of Vigin PP/PET Blends

Dynamic Mechanical Behaviour of Vigin PP/PET Blends

In this paper, virgin Polyethylene tere phthalate has been blended in an elastic extruder with three different types of polypropylenes such as low viscosity Polypropylene (A 5012), high viscosity PP (K 7050) and modified PP (XKP 707W). Dynamic mechanical behaviour such as storage modulus (Er) and dissipation factor (tan δ) of these blends has been determined at different temperatures. Effects of blending ratio on storage modulus and dissipation factor have been determined, compared and analyzed. It has been found that addition of PET increased the storage modulus of PP due to the higher modulus of PET. An additional peak has been observed In tan δ plots obtained for PP/PET blends. This additional peak corresponds to a-relaxation of PET. Type of PP addition has also modified the dissipation factor (tan δ) and storage modulus Er behaviour of blends.
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Mechanical behaviour of a creased thin strip

Mechanical behaviour of a creased thin strip

Received: 20 October 2017 – Revised: 22 December 2017 – Accepted: 30 January 2018 – Published: 20 February 2018 Abstract. In this study the mechanical behaviour of a creased thin strip under opposite-sense bending was in- vestigated. It was found that a simple crease, which led to the increase of the second moment of area, could significantly alter the overall mechanical behaviour of a thin strip, for example the peak moment could be in- creased by 100 times. The crease was treated as a cylindrical segment of a small radius. Parametric studies demonstrated that the geometry of the strip could strongly influence its flexural behaviour. We showed that the uniform thickness and the radius of the creased segment had the greatest and the least influence on the mechan- ical behaviour, respectively. We further revealed that material properties could dramatically affect the overall mechanical behaviour of the creased strip by gradually changing the material from being linear elastic to elastic- perfect plastic. After the formation of the fold, the moment of the two ends of the strip differed considerably when the elasto-plastic materials were used, especially for materials with smaller tangent modulus in the plastic range. The deformation patterns of the thin strips from the finite element simulations were verified by physical models made of thin metal strips. The findings from this study provide useful information for designing origami structures for engineering applications using creased thin strips.
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MECHANICAL BEHAVIOUR OF ALUMINA-ZIRCONIA COMPOSITE BY SLURRY METHOD

MECHANICAL BEHAVIOUR OF ALUMINA-ZIRCONIA COMPOSITE BY SLURRY METHOD

Alumina has got some excellent properties like chemical inertness, thermal and mechanical strength against hazardous environment. Alumina is a good ceramic material which is being used for structural applications. To enhance the toughness and strength of the body some Zirconia is also used with it. The use of Zirconia in alumina is known as toughening of alumina. One difficulty arises, when alumina and alumina toughened composite are sintered , because the low sinterability of Alumina-Zirconia forced the compact to give very low density body. To overcome this problem alumina and alumina composites are made from slurry method which gives nearly theoretical density. The combined effect of alumina and Zirconia on the phase transformation and microstructure development of heat-treated Alumina-Zirconia composites has been studied. Slurry is prepared by adding water, dispersant, binder and anti-foaming agent. In the present study, Sintering schedule is optimized and kept constant for all samples. After sintering, mechanical behaviour of the composite has been studied.
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The Mechanical Behaviour of Eggshell and Coconut Coir Reinforced Composites

The Mechanical Behaviour of Eggshell and Coconut Coir Reinforced Composites

The mechanical behaviour of the CE composite material has been estimated in the present work. The materials of CE composite had taken in different ratios are mixed with resin and hardener and made into geometrical shapes. These have been tested experimentally for impact, compression and tensile tests. The results reveal that high compression strength is obtained for C5 composition, because eggshell has good compressive strength. For tensile test C1 composition has good tensile strength and strain, because coconut coir fiber has good tensile properties. In the C1 composition the coconut coir percentage is more than egg shell powder. So from the present work it is concluded that the tensile strength of composite depend on coir fiber and compression strength of composite depend on eggshell quantity.
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Mechanical behaviour of Ti-Nb-Hf alloys

Mechanical behaviour of Ti-Nb-Hf alloys

the alloys showed no obvious superelastic behaviour, they exhibited pronounced strain hardening and could achieve high elongations before failure (>30% engineer- ing strain). Post-mortem examination revealed that the mechanism of strain hard- ening was extensive blue{332} and/or {211} deformation twinning. Twinning was found to be more prevalent in alloys with 2 at.% Hf compared to those with 4 at.%. The cryogenic temperature deformation also promoted deformation twinning when compared to ambient temperature results. As is the case with other metastable β-Ti alloys, maintaining control over the precipitation of ω phases was found to be crucial for attaining desirable mechanical behaviour. Further, microstructural engineering and alloying may be used to develop strong, lightweight alloys based on the Ti-Nb-Hf system with beneficial strain hardening characteristics for energy absorption, cryogenic and biomedical applications.
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The effect of skew angle on the mechanical behaviour of masonry arches

The effect of skew angle on the mechanical behaviour of masonry arches

3DEC is an advanced numerical modelling code based on DEM for discontinuous modelling and can simulate the response of discontinuous media, such as masonry, subjected to either static or dynamic loading. When used to model masonry, the units (i.e. stones) are represented as an assemblage of rigid or deformable blocks which may take any arbitrary geometry. Typically, rigid blocks are adequate for structures with stiff, strong units, in which deformational behaviour takes place at the joints. For explicit dynamic analysis, rigid block models run significantly faster. For static problems, this computational advantage is less important, so deformable blocks are preferable, as they provide a more elaborate representation of structural behaviour. Deformable blocks, with an internal tetrahedral FE mesh, were used in the analyses reported herein. Joints are represented as interfaces between blocks. These interfaces can be viewed as interactions between the blocks and are governed by appropriate stress-displacement constitutive laws. These interactions can be linear (e.g. spring stiffness) or non-linear functions. Interaction between blocks is represented by set of point contacts, of either vertex to face or edge to edge type (Fig. 3). In 3DEC, finite displacements and rotations of the discrete bodies are allowed. These include complete detachment between blocks and new contact generation as the calculation proceeds. Contacts can open and close depending on the stresses acting on them from the application of the external load. Contact forces in both the shear and normal direction are considered to be linear functions of the actual penetration in shear and normal directions respectively (Itasca 2004). In the normal direction, the mechanical behaviour of joints is governed by the following equation:
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Measuring, modelling and understanding the mechanical behaviour of bagasse

Measuring, modelling and understanding the mechanical behaviour of bagasse

In the Australian sugar industry, sugar cane is smashed into a straw like material by hammers before being squeezed between large rollers to extract the sugar juice. The straw like material is initially called prepared cane and then bagasse as it passes through successive roller milling units. The sugar cane materials are highly compressible, have high moisture content, are fibrous, and they resemble some peat soils in both appearance and mechanical behaviour.

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Physical characteristics and mechanical behaviour of maize stalks for machine development

Physical characteristics and mechanical behaviour of maize stalks for machine development

Generally, all of the mechanical experiments in the current study focus on the internodal sections of the stalk because the likelihood of loading on an internodal section of the stalk is higher than on the nodal section (Igathinathane et al., 2011). Before the experiments, the minor and major dimensions of the internodal cross-section were measured for each sample by using a digital calliper (accuracy 0.01 mm). During all of the experiments, the minor axis of the internodes was in the direction of the load, theforce-dis- placement data were collected at 100 Hz by a universal testing machine (Zwick Z020 test frame with a 5000-N load cell) and high-resolution videos were recorded for each sample at a rate of 30 frames per second. Afterwards, the recorded videos and force-displacement curves were analysed in detail to determine the mechanical behaviour of the stalks, moreover, in order to analyse the required com- pressive and bending work requirement of the internodal sections Eq. (6) may be used:
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Mechanical behaviour of Basalts from Central India

Mechanical behaviour of Basalts from Central India

ABSTRACT: Five variants of Massive basalt and three variants of Vesicular basalt from Central India have been investigated in the laboratory for understanding the mechanical behaviour of rock. These basalts were obtained from different locations of Betwa river basin. The mineralogical compositions of these basalts were quantified through X-ray diffraction method (XRD). These basalts have been investigated for uniaxial compressive strength, indirect tensile strength, Tangent Modulus (E 50 ), Poisson’s ratio (µ) and shear strength parameters (cohesion and angle of internal
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Study On Mechanical Behaviour Of Resistance Spot-Welding Technology

Study On Mechanical Behaviour Of Resistance Spot-Welding Technology

This report described about a project titled “Study on Mechanical Behaviour of Resistance Spot-Welding Technology”. Resistance spot welding is widely used in automotive body assembly compared to other joining technology. Resistance spot weld produce less heat affected zone in workpiece and have greater joining strength. The strength of the spot weld is influenced by many factors such as physical, chemical and mechanical properties of the base metal. An optimized condition of parameters can give good and quality weld joints. The influence of the primary parameters which are welding current and weld time on the tensile shear force and microstructure of the spot weld joint between mild steel and galvanized steel has been investigated in this study. The experiment is conducted to study the effect of the resistance spot welding joining strength by varying the sheet material, sheet metal thickness, weld time and welding current. From the observation two types of fracture mode was found which are separation and tearing types. It was found from the study, increasing current, welding time and material thickness increases the tensile shear strength and hardness value. The presents of porosity did not directly affect the strength of the weld since no initiation of crack in the weld nugget when tensile test are carried out.
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Numerical calibration of mechanical behaviour of composite shell tunnel linings

Numerical calibration of mechanical behaviour of composite shell tunnel linings

CSL tunnels using spray-applied membrane in soft ground are still a very recent and innovative lining configuration. Until now there is no in-situ testing data available regarding the actual membrane humidity condition in the CSL configuration in the long term. The samples used in this study were stored under ambient laboratory conditions, which is likely to be drier than the in-situ condition. On the one hand, the main purpose of this research is to develop and validate a numerical modelling approach for simulating the composite mechanical behaviour, and it is better to avoid introducing membrane saturation as an additional variable in the calibration, as its impact can be directly reflected by varying the spray-applied membrane interface properties in the numerical model once calibrated. On the other hand, the laboratory measured values of strength and stiffness are likely to be high compared to the in-situ values and therefore should not (along with the derived variable of degree of composite action) be used directly for design but rather as indicative and for calibration of the numerical model. Further investigations of realistic humidity conditions in CSL structures, and their influence on membrane properties, is required to provide realistic membrane interface input data for the full CSL tunnel design.
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Mechanical behaviour of Ostrich’s eggshell at compression

Mechanical behaviour of Ostrich’s eggshell at compression

In the given paper the results on the mechanical behaviour of the Ostrich’s eggs under quasi static compression between two plates are presented. Experiments have been performed in two steps. First of all the eggshell stiff ness has been evaluated. The egg is placed horizontally between two parallel steel plates and a force of 100 N is exerted on the object. The force, F –displacement, x curve is registered and the slope of this curve is used for the assessment of a static stiff ness parameter (k s ). It

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Testing the Mechanical Behaviour of Flax/Carbon Reinforced Hybrid Composites

Testing the Mechanical Behaviour of Flax/Carbon Reinforced Hybrid Composites

deflection of woven banana fibre specimen beam of 0.5 mm. The maximum stress and Young s modulus in x-direction was recorded to be 26.181 MN/m2 and 2.685 GN/m2, respectively. Statistical analysis using ANOVA-one way has showed that the differences of results obtained from those three samples are not significant, which confirm a very stable mechanical behaviour of the composites under different tests.

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Mechanical Behaviour of Textile Reinforced Concrete

Mechanical Behaviour of Textile Reinforced Concrete

The Concrete Matrix applied in TRC differs from that typically used in conventional steel reinforced concrete. Fine-grained concrete also defined as mortar is typically prescribed for TRC, where the maximum aggregate size is typically <2mm. Self compacting and highly flowable concrete is primarily needed to adequate penetrate the openings of the textile reinforcement structure to allow for adequate bond and load transfer from the concrete to the reinforcement. This minimal aggregate size could however increase shrinkage and the need for larger quantities of cement paste; as such, a slight increase in maximum aggregate size to 4-6 mm could be considered while bearing in mind the desired design thickness of the TRC structure. Moreover, the matrix should be designed chemically compatible with the selected reinforcement, i.e. in terms of alkalinity, while providing the required strength properties, mechanical behaviour and suitable characteristics for the specimen geometry and production method. For instance, the concrete matrix could also be designed such that the alkalinity and hydration kinetics be altered or by modifying the morphology at the interface of the textile reinforcement by means of polymer coating along with Nano clay. Additions of silica fume or high alumina cement, for example, can be incorporated in the mix to lower the alkalinity. For the past several decades,
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MECHANICAL BEHAVIOUR OF POLYSTYRENE REINFORCED SUGARCANE BAGASSE COMPOSITES

MECHANICAL BEHAVIOUR OF POLYSTYRENE REINFORCED SUGARCANE BAGASSE COMPOSITES

This paper presents the study on some of mechanical properties of PS-SCB composites. The SCB was taken 10% by weight in all the synthesized PS-composites. Four different sizes namely, 75µm to 105µm, 105µm to 150µm, 150µm to 255µm and 255µm to 350µm of SCB particle were used to synthesize the composites. The composites were prepared by in- situ polymerization method. Hand operated injection moulding machine was used to make the test specimens. The effect of SCB particle size on the mechanical properties of the PS-SCB powder composites was studied
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Mechanical Behaviour of Recycled Coarse and Fine Aggregate in Concrete

Mechanical Behaviour of Recycled Coarse and Fine Aggregate in Concrete

------------------------------------------------------------------------***------------------------------------------------------------------------- Abstract - Concrete is the most broadly utilized development material on the planet. It has been being used in for a considerable length of time in different sorts of structures because of its flexible nature. Increment popular and diminishes in the supply of totals for the generation of solid outcome in the need to recognize the new wellspring of the total. Then again, enormous amounts of structure rubble are squandered every year amid the destruction of old structures to make away for new and present-day methods because of fast urbanization. Likewise, the transfers of such materials make issues in the perspective on the shortage of appropriate dumping grounds and meeting natural prerequisites. Squander is one of the principle challenges in our occasions, so solid waste can be changed over into reusable aggregates. The target of this undertaking is to exhibit that it is conceivable by methods for utilizing reused materials to fulfill the prerequisites of the present-day structure without fundamentally impeding the last exhibitions or expanding the expense of development. There are numerous investigations that demonstrate that solid made with this kind of coarse totals can have mechanical properties like those of ordinary cement and even high-quality cement is presently days a conceivable objective for this earth sound practice. This exploratory examination attempts to discover the ideal level of the reused fine total with 100% swap of the coarse total for M20 blend, Indian standard ostensible blend configuration was utilized. For this blend, quality properties from compressive quality, split rigidity, modulus of flexibility test and toughness properties from chloride assault, sulfate assault, and porous test have done. In view of these properties, ideal rates of fines have found.
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Physical and mechanical behaviour of polysiloxane filled silica sheet

Physical and mechanical behaviour of polysiloxane filled silica sheet

Polymeric matrix composite is one of the types of classification of matrix materials usually use in industry application. Polymer is defined as chemical compound where molecules are bonded together in long repeating chains. These polymers have a unique property and can be tailored depending on their purpose. Besides that, it makes ideal materials as they can be processed easily, possess lightweight, and desirable mechanical properties. Basically, the matrix is more ductile and less hard phase (Josmin et al., 2012).

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Mechanical Behaviour of Natural Fibre Reinforced Epoxy Composites

Mechanical Behaviour of Natural Fibre Reinforced Epoxy Composites

Composite materials is an across-the-board scope of good-looking aspects like the relatively high Tensile strength, Flexural strength, Impact strength, good adaptability in low density and corrosion resistance. Composite materials have good mechanical, chemical, and electrical properties. The resulting can be concluded based on the study of Natural Reinforcement Composites for Mechanical properties and Chemical Resistance.

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Mechanical Behaviour of Composite Corrugate Core Sandwich Panels

Mechanical Behaviour of Composite Corrugate Core Sandwich Panels

For design and construction of light weight transportation systems such as satellites, aircraft, high-speed trains and fast ferries, structural weight saving is one of the major considerations [1]. To meet this requirement, sandwich construction is frequently used instead of increasing material thickness. This type of construction consists of thin two facing layers separated by a core material. One of the advantages of sandwich structures is that they can have a relatively high fraction of open space, hence a much lower density as compared to the parent material. In nature, cellular materials have evolved to make biological parts more structurally efficient by eliminating unstressed material and providing pathways for the growth of other organic materials [3]. The corrugated core sandwich panel is a progressive evolution of lattice truss structures in which the metal trusses are replaced with metallic wires, which facilitates fabrication due to the continuous nature of the wire-mesh employed as raw material. The corrugations provide the layers with high rigidity and stiffness in the direction perpendicular to the corrugations. Typically, alternate layers of the corrugated core sandwich panels are arranged orthogonally so that the high stiffness provided by the corrugation is available in both directions. Unlike metallic foam, which also has potential for similar application, the CWML offers the advantage of controllable rigidity and strength [3]. The material of the wire mesh, wire diameter, opening width, and corrugation parameters such as the corrugation height and the base angle can be altered to provide a wide range of strength to the laminate structure [5]. In aerospace and mechanical engineering fields, CWML has potential for applications as high strength, low weight, core material in structural sandwich construction [6]. In order to find maximum strength of corrugated core sandwich panel under compressive and bending loading number of experiments can be performed for different combinations of operating parameters and their optimum values can be found out. The idea to analyse the influence of Sandwich panel using perforated sheet is a good way to review the physical properties of material compressive strength, analysis the structure of sandwich panel by application of load.
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Study of Mechanical Behaviour of Nickel during Machining - A Review

Study of Mechanical Behaviour of Nickel during Machining - A Review

2. Gustavo de SiqueiraGaloppi , Marco StipkovicFilho (2008-09), “Hard turning of tempered DIN 100Cr6 steel with coated and no coated CBN inserts” , a Laboratory of Manufacturing Engineering, Department of Mechatronics and Mechanical Systems Engineering, EscolaPolit´ecnica da Universidade de Sao Paulo, Av. Prof. Mello de Moraes, 2231, 05508-970, S. Paulo, SP, Brazil b Centro Universit´arioInstitutoMau´a de Tecnologia, EscolaMau´a de Engenharia, Pra¸caMau´a 1, 09580.900 S˜ao Caetano do Sul, SP, Brazil.

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