006_Material properties - SAFIR manual - UEE
... considered in the Eurocode model), but which, in addition, is able to take into account the nonreversibility of transient creep strain when the stress and/or the temperature is decreasing (Gernay and Franssen, 2012), (Gernay, 2012). It must be stressed that, even with continuously increasing tempera ...
... considered in the Eurocode model), but which, in addition, is able to take into account the nonreversibility of transient creep strain when the stress and/or the temperature is decreasing (Gernay and Franssen, 2012), (Gernay, 2012). It must be stressed that, even with continuously increasing tempera ...
numerical modelling and design of alfc shield loaded by 20 mm fsp
... 500T steel plate. The ALFC shield is composed of the ALF energy-absorbing subsystem and a 99.7% Al2O3 alumina ceramic layer. The ALF subsystem is designed to absorb blast wave impact energy induced by explosive materials up to 10 kg TNT. The ceramic layer is aimed at stopping FSP fragments. The 5 mm ...
... 500T steel plate. The ALFC shield is composed of the ALF energy-absorbing subsystem and a 99.7% Al2O3 alumina ceramic layer. The ALF subsystem is designed to absorb blast wave impact energy induced by explosive materials up to 10 kg TNT. The ceramic layer is aimed at stopping FSP fragments. The 5 mm ...
Preparation of Papers for AIAA Technical Conferences
... interstage of the booster, providing an interface between the booster and dart with no fasteners. ...
... interstage of the booster, providing an interface between the booster and dart with no fasteners. ...
An evaluation of switching criteria for ferroelectrics under stress and
... derived from a thermodynamic framework and use fitting functions based on experimental observation (see [3,11–16]). In most phenomenological models, the ferroelectric constitutive law is derived from a postulated Helmholtz free energy statement, with the remanent strain and remanent polarization as ...
... derived from a thermodynamic framework and use fitting functions based on experimental observation (see [3,11–16]). In most phenomenological models, the ferroelectric constitutive law is derived from a postulated Helmholtz free energy statement, with the remanent strain and remanent polarization as ...
Characterization of flexure hinges for the French watt balance
... Planck’s constant with a relative uncertainty of order of 10-8 and thereby redefine the SI kilogram. In such an experiment, the weight of a mass standard is first balanced by the electromagnetic force exerted on a current carrying coil in a magnetic field. In a second dynamic phase, the coil is disp ...
... Planck’s constant with a relative uncertainty of order of 10-8 and thereby redefine the SI kilogram. In such an experiment, the weight of a mass standard is first balanced by the electromagnetic force exerted on a current carrying coil in a magnetic field. In a second dynamic phase, the coil is disp ...
L6-Imperfections
... Dislocations do not move with the same degree of ease on all crystallographic planes of atoms and in all crystallographic directions. • Slip direction - The direction in which a dislocation moves. • Slip plane - The plane of preferred dislocation ...
... Dislocations do not move with the same degree of ease on all crystallographic planes of atoms and in all crystallographic directions. • Slip direction - The direction in which a dislocation moves. • Slip plane - The plane of preferred dislocation ...
English - SciELO Colombia
... Sands under shear loading may be contractile or dilatant, based on their initial state regarding CSL. The initial state of a sand sample is usually defined in terms of its initial void ratio (e) and effective stress level, such as the effective minor principal stress (´3) or the effective mean prin ...
... Sands under shear loading may be contractile or dilatant, based on their initial state regarding CSL. The initial state of a sand sample is usually defined in terms of its initial void ratio (e) and effective stress level, such as the effective minor principal stress (´3) or the effective mean prin ...
Finite Volume Methods for the Simulation of Skeletal Muscle
... Since it relies on a geometrical rather than a variational framework, many find the finite volume method (FVM) more intuitive than the finite element method (FEM). We show that the FVM allows one to interpret the stress inside a tetrahedron as a simple “multidimensional force” pushing on each face. ...
... Since it relies on a geometrical rather than a variational framework, many find the finite volume method (FVM) more intuitive than the finite element method (FEM). We show that the FVM allows one to interpret the stress inside a tetrahedron as a simple “multidimensional force” pushing on each face. ...
Metamodel assisted design optimization of
... two substrate layers and a piezoelectric plate. The PFT was made into a rectangular shape to retrofit into a shoe and tested subject to a force greater than 1kN. This configuration of the PFT device can efficiently transfer the force from the endcaps to the piezoelectric disk. In order to increase t ...
... two substrate layers and a piezoelectric plate. The PFT was made into a rectangular shape to retrofit into a shoe and tested subject to a force greater than 1kN. This configuration of the PFT device can efficiently transfer the force from the endcaps to the piezoelectric disk. In order to increase t ...
Material Science - New Age International
... individual requirements. The rapid developments in the field of quantum theory of solids have opened vast opportunities for better understanding and utilisation of various materials. The spectacular success in the field of space is primarily due to the rapid advances in high-temperature and high-str ...
... individual requirements. The rapid developments in the field of quantum theory of solids have opened vast opportunities for better understanding and utilisation of various materials. The spectacular success in the field of space is primarily due to the rapid advances in high-temperature and high-str ...
Shear Thickening and Shear Induced Heterogeneities in - I
... matches that of a Newtonian fluid [Fig. 1(c)] [9, 16], consistently with the linear behavior of the torque. However as soon as we go beyond the critical rotation rate, instead of going to zero continuously over the entire gap, the velocity profile again goes to zero at some finite distance from the ...
... matches that of a Newtonian fluid [Fig. 1(c)] [9, 16], consistently with the linear behavior of the torque. However as soon as we go beyond the critical rotation rate, instead of going to zero continuously over the entire gap, the velocity profile again goes to zero at some finite distance from the ...
Stress relaxation in aging soft colloidal glasses
... much larger than the age of the system. For tW > 1000 s, the data can be modeled by eqn (1), and the fitted values of t1, f and B are plotted in Fig. 5. As expected, we observe that the baseline of the fast process f and the stretching exponent B are fairly insensitive to changes in the sample age, ...
... much larger than the age of the system. For tW > 1000 s, the data can be modeled by eqn (1), and the fitted values of t1, f and B are plotted in Fig. 5. As expected, we observe that the baseline of the fast process f and the stretching exponent B are fairly insensitive to changes in the sample age, ...
Strain state in silicon structures for microprocessor technology M.
... made to avoid undesired stress. On the other hand, positive effects of strain are employed in CMOS transistor technology. The reason is a significant performance gain achievable by introducing strained films into active transistor regions [1, 2] which will become more important as the long-term scal ...
... made to avoid undesired stress. On the other hand, positive effects of strain are employed in CMOS transistor technology. The reason is a significant performance gain achievable by introducing strained films into active transistor regions [1, 2] which will become more important as the long-term scal ...
Ideal shear strength and deformation behaviours of L10 TiAl from
... Several theoretical calculations have been performed to study the mechanical properties of L10 TiAl, involving the deformation, fracture behaviour and dislocations etc. Atomistic simulations of dislocation configurations of L10 TiAl were investigated using embedded-atom method potentials [24,25]. The ...
... Several theoretical calculations have been performed to study the mechanical properties of L10 TiAl, involving the deformation, fracture behaviour and dislocations etc. Atomistic simulations of dislocation configurations of L10 TiAl were investigated using embedded-atom method potentials [24,25]. The ...
Determination of shear strength of unidirectional composite
... a combined stress-failure criterion. There is currently no ASTM standard for the 10 o-axis test speci®cally, although ASTM D 3039-76 is a standard test method for o-axis tests on composite materials in general. Pindera and Herakovich [20] examined the errors in the measured values of elastic prop ...
... a combined stress-failure criterion. There is currently no ASTM standard for the 10 o-axis test speci®cally, although ASTM D 3039-76 is a standard test method for o-axis tests on composite materials in general. Pindera and Herakovich [20] examined the errors in the measured values of elastic prop ...
MAXENT distribution of grain sizes
... distribution that maximizes entropy is the least-biased estimate that can be made. It agrees with everything that is known but carefully avoids anything that is unknown. ...
... distribution that maximizes entropy is the least-biased estimate that can be made. It agrees with everything that is known but carefully avoids anything that is unknown. ...
Ductile Ceramics
... reduced and an increase in strength may be achieved. As usually observed, material undergoing plastic deformation tend to strain harden, a feature observed also in ductile ceramics. Of the several factors influencing the strength properties of ductile ceramics, grain size is outstanding. Fine graine ...
... reduced and an increase in strength may be achieved. As usually observed, material undergoing plastic deformation tend to strain harden, a feature observed also in ductile ceramics. Of the several factors influencing the strength properties of ductile ceramics, grain size is outstanding. Fine graine ...
the entry tests
... (C) The specific strength of composite is lower than that of aluminum alloy (D) The specific modulus of composite is lower than that of aluminum alloy 2) Which of the following four statements is correct? ( ) (A) The designability of composite materials is poor (B) The composite material has good vi ...
... (C) The specific strength of composite is lower than that of aluminum alloy (D) The specific modulus of composite is lower than that of aluminum alloy 2) Which of the following four statements is correct? ( ) (A) The designability of composite materials is poor (B) The composite material has good vi ...
Nanosecond UV laser-induced fatigue effects in the bulk of synthetic
... maximum number of pulses per site was 104. The spatial beam profile at the focus was not close to Gaussian and the details are given in Fig. 2. The setup is fully automated in a LabView environment. Two triggered fast digital cameras (> 100 fps) combined with suited microscope objectives are used f ...
... maximum number of pulses per site was 104. The spatial beam profile at the focus was not close to Gaussian and the details are given in Fig. 2. The setup is fully automated in a LabView environment. Two triggered fast digital cameras (> 100 fps) combined with suited microscope objectives are used f ...
Pore-Scale Controls on Reaction
... show how fracturing can allow the reaction to proceed, and how the closure of nanoscale fluid pathways will cause the reaction to stop. In all of these examples, two conditions are absolutely necessary for fracturing to take place. The first is some thermodynamic overstepping of the reaction. In geo ...
... show how fracturing can allow the reaction to proceed, and how the closure of nanoscale fluid pathways will cause the reaction to stop. In all of these examples, two conditions are absolutely necessary for fracturing to take place. The first is some thermodynamic overstepping of the reaction. In geo ...
Pore-Scale Controls on Reaction-Driven Fracturing - DUO
... Fluid migration through reactive rocks invariably leads to modifications of the rock porosity and pore structure. This, in turn, provides feedback on the fluid migration process itself. Reactions may lead to increases or decreases of the rock permeability. When the volume of solids decreases, either ...
... Fluid migration through reactive rocks invariably leads to modifications of the rock porosity and pore structure. This, in turn, provides feedback on the fluid migration process itself. Reactions may lead to increases or decreases of the rock permeability. When the volume of solids decreases, either ...
ULTRA-FINE GRAIN TITANIUM USING FOR
... The problem at the development of metallic bio-materials consists not only in their real or potential toxicity, but also in their allergenic potential. Sensitivity of population to allergies keeps increasing. Allergies to metals are caused by metallic ions which are released from metals by body flui ...
... The problem at the development of metallic bio-materials consists not only in their real or potential toxicity, but also in their allergenic potential. Sensitivity of population to allergies keeps increasing. Allergies to metals are caused by metallic ions which are released from metals by body flui ...
Design of Filled One Step Chip Attach Materials for
... behavior allows the material to rapidly decrease in viscosity and flow when compressed during the die placement step and when sheared during dispensing. The challenge for designing a filled OSCA-R material is to maximize the filler loading without compromising the other flow properties. For example; ...
... behavior allows the material to rapidly decrease in viscosity and flow when compressed during the die placement step and when sheared during dispensing. The challenge for designing a filled OSCA-R material is to maximize the filler loading without compromising the other flow properties. For example; ...
A review on shape memory alloys with applications to morphing
... phase, which is the typical phase for an SMA at ‘low’ temperature. It consists of a dense arrangement of crystal planes placed with an opposite orientation and with very high relative mobility (resulting in low Young’s modulus and good damping characteristics). When the material is loaded above the ...
... phase, which is the typical phase for an SMA at ‘low’ temperature. It consists of a dense arrangement of crystal planes placed with an opposite orientation and with very high relative mobility (resulting in low Young’s modulus and good damping characteristics). When the material is loaded above the ...
Effect of material and geometric parameters on deformations near
... impact a shear band initiating from the notch-tip propagated nearly parallel to the notch-axis, got arrested and a crack ensued from the shear band tip. They attributed the difference in their and Kalthoff’s experimental results to different values of material parameters. We note that Kalthoff liste ...
... impact a shear band initiating from the notch-tip propagated nearly parallel to the notch-axis, got arrested and a crack ensued from the shear band tip. They attributed the difference in their and Kalthoff’s experimental results to different values of material parameters. We note that Kalthoff liste ...
Fatigue (material)
In materials science, fatigue is the weakening of a material caused by repeatedly applied loads. It is the progressive and localized structural damage that occurs when a material is subjected to cyclic loading. The nominal maximum stress values that cause such damage may be much less than the strength of the material typically quoted as the ultimate tensile stress limit, or the yield stress limit.Fatigue occurs when a material is subjected to repeated loading and unloading. If the loads are above a certain threshold, microscopic cracks will begin to form at the stress concentrators such as the surface, persistent slip bands (PSBs), and grain interfaces. Eventually a crack will reach a critical size, the crack will propagate suddenly, and the structure will fracture. The shape of the structure will significantly affect the fatigue life; square holes or sharp corners will lead to elevated local stresses where fatigue cracks can initiate. Round holes and smooth transitions or fillets will therefore increase the fatigue strength of the structure.