Angustifolia NSR-10, Title G.12 Kunth
... structural element, which, in many cases, can be seen in structures with robust and heavy elements, or on the other hand it can also be seen in structures with an inaccurate balance of load solicitation. A high deficit in dwellings is made evident, especially for marginalized society, which do not h ...
... structural element, which, in many cases, can be seen in structures with robust and heavy elements, or on the other hand it can also be seen in structures with an inaccurate balance of load solicitation. A high deficit in dwellings is made evident, especially for marginalized society, which do not h ...
Failure modes of composite sandwich beams
... of the beam to prevent premature core failures. Also, under three-point bending, the faces directly under concentrated loads were reinforced with additional layers of carbon/epoxy to suppress and prevent indentation failure. Only in the case when the indentation failure mode was studied, there was n ...
... of the beam to prevent premature core failures. Also, under three-point bending, the faces directly under concentrated loads were reinforced with additional layers of carbon/epoxy to suppress and prevent indentation failure. Only in the case when the indentation failure mode was studied, there was n ...
Materials for Optical Systems
... optical windows are plane-parallel plates of optical quality glass, but sometimes a small wedge may be introduced between the two surfaces to correct the errors introduced by the window itself. In some applications involving large field of view, optical windows are shaped like a shell or dome with a ...
... optical windows are plane-parallel plates of optical quality glass, but sometimes a small wedge may be introduced between the two surfaces to correct the errors introduced by the window itself. In some applications involving large field of view, optical windows are shaped like a shell or dome with a ...
Structural basis for bending of organic crystals{
... While evidence for such a phenomenon might be anecdotal, and surely crystals with unusually deformed morphologies have been noted by crystallographers over the years, we are unaware of any report that systematically correlates such bending with crystal packing and intermolecular interactions. When a ...
... While evidence for such a phenomenon might be anecdotal, and surely crystals with unusually deformed morphologies have been noted by crystallographers over the years, we are unaware of any report that systematically correlates such bending with crystal packing and intermolecular interactions. When a ...
Determination of Actual Friction Factors in Metal Forming
... Recent studies published by Hua et al. [5] and Zhang and Ou [6] show the enthusiastic interest of the scientific community to develop new methods for friction characterization and to discover new relationships between classical friction models, respectively. The most widely accepted methodology to c ...
... Recent studies published by Hua et al. [5] and Zhang and Ou [6] show the enthusiastic interest of the scientific community to develop new methods for friction characterization and to discover new relationships between classical friction models, respectively. The most widely accepted methodology to c ...
Effect of casting mould on mechanical properties of 6063 aluminum
... approximately the same proportion in the matrix. However the average crystal size and shape differ within each of the matrices. In samples cast with CO2 and naturally-bonded sand moulds the crystal of α-aluminum Mg2Si and AlMgSi phases, Figs. 4(a) and (d), are averagely fine and well dispersed in th ...
... approximately the same proportion in the matrix. However the average crystal size and shape differ within each of the matrices. In samples cast with CO2 and naturally-bonded sand moulds the crystal of α-aluminum Mg2Si and AlMgSi phases, Figs. 4(a) and (d), are averagely fine and well dispersed in th ...
simulation of bolt prestressing in steel shear connections
... exceed the yield point, plasticity starts spreading throughout the bolt, until a specific cross section has been completely plastified. This means that deformation increases rapidly with a small increase of the applied force. As the deformation increases, stresses at all the points of the plastified ...
... exceed the yield point, plasticity starts spreading throughout the bolt, until a specific cross section has been completely plastified. This means that deformation increases rapidly with a small increase of the applied force. As the deformation increases, stresses at all the points of the plastified ...
Revisit and insight into the dilemma of strong and brittle materials
... Let us consider the physical origin of effects of GBs, either being “beneficial” or “detrimental”. It is well known that the presence of GBs becomes a potential barrier to dislocation motion, resulting in the generation of local stress concentration and strengthening during plastic deformation in poly ...
... Let us consider the physical origin of effects of GBs, either being “beneficial” or “detrimental”. It is well known that the presence of GBs becomes a potential barrier to dislocation motion, resulting in the generation of local stress concentration and strengthening during plastic deformation in poly ...
high strain rate behaviour of woven composite
... The thesis centres on the dynamic behaviour of woven composite materials. The increase in the use of these materials in the aerospace industry demands a reliable constitutive damage model to predict their response under high strain rate loading. The current available models do not include rate effec ...
... The thesis centres on the dynamic behaviour of woven composite materials. The increase in the use of these materials in the aerospace industry demands a reliable constitutive damage model to predict their response under high strain rate loading. The current available models do not include rate effec ...
Effect of SiC Grain Refining on Wear Resistance of Mg
... [3,4]. However limited mechanical properties of magnesium alloys are the main problems to overcome to widen the usage of these materials in different applications [5]. Wear damage is one of the main problems for moving parts in automotive production. In general magnesium and its alloys show poor wea ...
... [3,4]. However limited mechanical properties of magnesium alloys are the main problems to overcome to widen the usage of these materials in different applications [5]. Wear damage is one of the main problems for moving parts in automotive production. In general magnesium and its alloys show poor wea ...
Mechanical Properties of Pedal Mucus and Their Consequences for
... (Grenon and Walker, 1980; Denny, 1983). As one might expect from this composition pedal mucus behaves as a slightly elastic liquid rather than as the slightly viscous solids such as collagen and bone with which we are more familiar. Because of the primarily viscous, and therefore time dependent, nat ...
... (Grenon and Walker, 1980; Denny, 1983). As one might expect from this composition pedal mucus behaves as a slightly elastic liquid rather than as the slightly viscous solids such as collagen and bone with which we are more familiar. Because of the primarily viscous, and therefore time dependent, nat ...
Principles of Active Vibration Control
... monocrystalline materials, such as quartz, tourmaline, topaz and Rochelle salt. However, these materials are generally not suitable as actuators for vibration control applications. Instead, man-made polycrystalline ceramic materials, such as lead zirconate titanate (PZT), can be processed to exhibit ...
... monocrystalline materials, such as quartz, tourmaline, topaz and Rochelle salt. However, these materials are generally not suitable as actuators for vibration control applications. Instead, man-made polycrystalline ceramic materials, such as lead zirconate titanate (PZT), can be processed to exhibit ...
Aging degradation of mechanical structures
... for σ ≤ σd , where A L > 0 and n > 1 are material constants depending on the rate of loading, σ is the uniaxial tensile stress, and σd is the stress at damage threshold. For this model one needs experimental results to obtain parameters A L and n, but these results are not available for all kinds of ...
... for σ ≤ σd , where A L > 0 and n > 1 are material constants depending on the rate of loading, σ is the uniaxial tensile stress, and σd is the stress at damage threshold. For this model one needs experimental results to obtain parameters A L and n, but these results are not available for all kinds of ...
Theoretical prediction on mechanical and thermal
... For Y4Al2O9, the chemical bonds are diverse in length and covalency; the bond strength and bond energy are anticipated to be miscellaneous. To quantify this diversity, the chemical parameters, such as covalency and bond energy, of each bond are calculated using chemical bond theory. The parameters o ...
... For Y4Al2O9, the chemical bonds are diverse in length and covalency; the bond strength and bond energy are anticipated to be miscellaneous. To quantify this diversity, the chemical parameters, such as covalency and bond energy, of each bond are calculated using chemical bond theory. The parameters o ...
Stress relaxation behaviour in compression and some other
... Thermoplastic elastomers have been found to have unsual properties, a consequence of composition and structure. The molecular composition comprises hard thermoplastic blocks which aggregate into domains, and flexible elastomer blocks in a linear or inter-penetrating structure. The mechanical propert ...
... Thermoplastic elastomers have been found to have unsual properties, a consequence of composition and structure. The molecular composition comprises hard thermoplastic blocks which aggregate into domains, and flexible elastomer blocks in a linear or inter-penetrating structure. The mechanical propert ...
Micromechanics of Cell Walls
... (Fig. 1a) the deformation is no longer completely reversible upon unloading. For stresses above this yield stress, the material is said to deform plastically (Fig. 2c). From the yield point onwards the strain consists of two independent contributions, of elastic and plastic strain. By this it is mea ...
... (Fig. 1a) the deformation is no longer completely reversible upon unloading. For stresses above this yield stress, the material is said to deform plastically (Fig. 2c). From the yield point onwards the strain consists of two independent contributions, of elastic and plastic strain. By this it is mea ...
Lecture 8 Springs
... For static stress the effect of curvature can be neglected For fatigue the effect of curvature is important ...
... For static stress the effect of curvature can be neglected For fatigue the effect of curvature is important ...
Determination of shear strength of unidirectional composite
... by straight-edged tabs, which produce parasitic shear stresses near the tab/specimen interfaces. Pierron and Vautrin [3] suggested the use of oblique tabs developed by Sun and Chung [21] to reduce these errors by providing a more uniform displacement ®eld in the specimen. However, Balakrishnan et al ...
... by straight-edged tabs, which produce parasitic shear stresses near the tab/specimen interfaces. Pierron and Vautrin [3] suggested the use of oblique tabs developed by Sun and Chung [21] to reduce these errors by providing a more uniform displacement ®eld in the specimen. However, Balakrishnan et al ...
Ab initio modelling of mechanical and elastic properties of solids
... The aim of the thesis is to study mechanical properties of crystalline materials on the basis of density functional theory (DFT) by applying first-principles or ab initio techniques. Mechanical properties of materials are of crucial importance for technological applications. How a material breaks, i ...
... The aim of the thesis is to study mechanical properties of crystalline materials on the basis of density functional theory (DFT) by applying first-principles or ab initio techniques. Mechanical properties of materials are of crucial importance for technological applications. How a material breaks, i ...
Grain subdivision and recrystallization in oligocrystalline tantalum
... oligocrystalline ingots consisting of coarse columnar grains aligned parallel to the longitudinal axis. These ingots can be further processed by cold swaging to large strains and subsequent annealing. Cold deformation leads to subdivision of the grains into misoriented regions. Such grain subdivisio ...
... oligocrystalline ingots consisting of coarse columnar grains aligned parallel to the longitudinal axis. These ingots can be further processed by cold swaging to large strains and subsequent annealing. Cold deformation leads to subdivision of the grains into misoriented regions. Such grain subdivisio ...
Fracture toughness and tensile properties of the titanium
... properties at 150°C, in the center of the ITER temperature window of the components concerned. The irradiation with protons will generate hydrogen in large quantities in the Ti alloys, with possible detrimental effects on the properties. The subsequent project TW3/TVM/TICRFA was dedicated to the stu ...
... properties at 150°C, in the center of the ITER temperature window of the components concerned. The irradiation with protons will generate hydrogen in large quantities in the Ti alloys, with possible detrimental effects on the properties. The subsequent project TW3/TVM/TICRFA was dedicated to the stu ...
Influence of the cutting regime on the residual stresses generated by
... geometric distortions of a component/structure, especially those subjected to alternating service loads and/or corrosive environments. It arises from the elastic response of material to inhomogeneous distribution of non-elastic strains, e.g., precipitation, phase transformation, thermal expansion, e ...
... geometric distortions of a component/structure, especially those subjected to alternating service loads and/or corrosive environments. It arises from the elastic response of material to inhomogeneous distribution of non-elastic strains, e.g., precipitation, phase transformation, thermal expansion, e ...
Mini- Implant Materials: An Overview
... compared. The results showed miniscrew A and C implants were pure titanium (equiaxed alpha titanium), whereas B and D contains small globular particles of beta titanium in a matrix of alpha titanium, Only αtitanium peaks were detected for all implants by micro x-ray diffraction, but beta-titanium wa ...
... compared. The results showed miniscrew A and C implants were pure titanium (equiaxed alpha titanium), whereas B and D contains small globular particles of beta titanium in a matrix of alpha titanium, Only αtitanium peaks were detected for all implants by micro x-ray diffraction, but beta-titanium wa ...
THE EFFECT OF CRYSTALLOGRAPHIC ORIENTATION ON
... The elastic modulus in the [110] and [111] directions are 170 GPa and 190 GPa, respectively. The [111] direction is at an angle of 54.74° from the [100] direction. .....................................................................................................................................17 ...
... The elastic modulus in the [110] and [111] directions are 170 GPa and 190 GPa, respectively. The [111] direction is at an angle of 54.74° from the [100] direction. .....................................................................................................................................17 ...
The impact behaviour of silk cocoons
... stress (Fig.3). The A. pernyi cocoon has a medium porosity compared with the other two cocoons: it exhibits yielding below 20% strain, which absorbs the energy to produce a tough behaviour; the structure fails when more than half of the sericin binder matrix fragments; the fibres then pull out from ...
... stress (Fig.3). The A. pernyi cocoon has a medium porosity compared with the other two cocoons: it exhibits yielding below 20% strain, which absorbs the energy to produce a tough behaviour; the structure fails when more than half of the sericin binder matrix fragments; the fibres then pull out from ...