Direct Shear Test on Expanded Polystyrene (EPS
... EPS geofoam is characterized by very low density (nearly 100 times lesser than soil) with potentially high compressibility, good flexural strength and high rupture strength in shear. The weakest plane in the failure of EPS geofoam under fill load was found to be at the interface between EPS geofoam ...
... EPS geofoam is characterized by very low density (nearly 100 times lesser than soil) with potentially high compressibility, good flexural strength and high rupture strength in shear. The weakest plane in the failure of EPS geofoam under fill load was found to be at the interface between EPS geofoam ...
Stress relaxation behaviour in compression and some other
... 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 properties such as stress relaxation, tensile strength, elongat ...
... 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 properties such as stress relaxation, tensile strength, elongat ...
Connecting mesoscopic and macroscopic scale lengths for
... is thought to be responsible for limiting the crack speed to about 50% of the theoretical limit of Rayleigh surface wave speed, by dissipating energy. At the extreme, microcracking in the vicinity of macroscopic crack edge has been shown advantageous in controlling and even in arresting a single mac ...
... is thought to be responsible for limiting the crack speed to about 50% of the theoretical limit of Rayleigh surface wave speed, by dissipating energy. At the extreme, microcracking in the vicinity of macroscopic crack edge has been shown advantageous in controlling and even in arresting a single mac ...
Distortions Generated by Welding Process Using ANSYS-FEA
... The objective of this paper is to present both a methodology of detailed axisymmetric simulation of a small scale welding test using the ANSYS general purpose finite element computer code and a comparison with test data. To simulate this manufacturing process, an APDL (ANSYS Parametric Design Langu ...
... The objective of this paper is to present both a methodology of detailed axisymmetric simulation of a small scale welding test using the ANSYS general purpose finite element computer code and a comparison with test data. To simulate this manufacturing process, an APDL (ANSYS Parametric Design Langu ...
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 ...
ElaStic: A universal tool for calculating elastic constants from first
... Preprint submitted to Computer Physics Communications ...
... Preprint submitted to Computer Physics Communications ...
Influence of the cutting regime on the residual stresses generated by
... that in almost all the cases there were some differences from the experimental data, most probably because of the inhomogeneity of material and the variation of temperature presented when experiments were conducted. It can be also observed that generally the tendency of residual stress distribution ...
... that in almost all the cases there were some differences from the experimental data, most probably because of the inhomogeneity of material and the variation of temperature presented when experiments were conducted. It can be also observed that generally the tendency of residual stress distribution ...
![[112] Oriented Terfenol-D Composites - J](http://s1.studyres.com/store/data/013252410_1-c13f81ecbca2953e2d0b5fc3e2aaeacf-300x300.png)
[112] Oriented Terfenol-D Composites - J
... requires a larger magnetic field to reach saturation. In addition we observe that the effect of applied stress on the fieldmagnetostriction behavior of the composite becomes larger as the volume fraction is decreased. This effect may be explained by understanding the role of composite architecture a ...
... requires a larger magnetic field to reach saturation. In addition we observe that the effect of applied stress on the fieldmagnetostriction behavior of the composite becomes larger as the volume fraction is decreased. This effect may be explained by understanding the role of composite architecture a ...
Engineering Mechanics
... materials testing: are the test data measured on a specimen transferable to an actual largescale structure? Specimens used in materials testing are models in the sense of a "threedimensional representation, usually on a smaller scale, of a structure", see above. In addition, they are of a simpler ge ...
... materials testing: are the test data measured on a specimen transferable to an actual largescale structure? Specimens used in materials testing are models in the sense of a "threedimensional representation, usually on a smaller scale, of a structure", see above. In addition, they are of a simpler ge ...
Acta Materialia_60_16_2012
... fatigue and furthermore computation power has significantly increased this is being revisited. Liu et al. presented a systematic simulation study of a bi-crystal in body centered cubic (BCC) iron using a 3D dislocation dynamics model and an FEA model to handle tractions and boundary conditions near ...
... fatigue and furthermore computation power has significantly increased this is being revisited. Liu et al. presented a systematic simulation study of a bi-crystal in body centered cubic (BCC) iron using a 3D dislocation dynamics model and an FEA model to handle tractions and boundary conditions near ...
A - Free-lancers.net
... On the first stage (OA zone) the creep deformation speed reduces gradually. This speed decreasing can be explained with the mechanical hardening and thermal softening interaction. At the first stage the mechanical hardening dominates due to the creep deformation increase. The equilibrium of the mec ...
... On the first stage (OA zone) the creep deformation speed reduces gradually. This speed decreasing can be explained with the mechanical hardening and thermal softening interaction. At the first stage the mechanical hardening dominates due to the creep deformation increase. The equilibrium of the mec ...
Thomson Template - University of North Texas
... acceleration) requires that all forces and torques to balance. • If the acceleration due to gravity is the same for all ...
... acceleration) requires that all forces and torques to balance. • If the acceleration due to gravity is the same for all ...
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 ...
numerical modelling and design of alfc shield loaded by 20 mm fsp
... Fig. 6. The numerical model of the FSP-SCP system: a) the axonometric view on the 1/4 part of the system, b) the axonometric view in larger scale ...
... Fig. 6. The numerical model of the FSP-SCP system: a) the axonometric view on the 1/4 part of the system, b) the axonometric view in larger scale ...
fracture analysis of surface- and through-cracked
... The denominator in equation (8) accounts for the nonlinearity of the material. An evaluation of the denominator for a given material is shown in Fig. 2. When the applied netsection stress is less than the uniaxial yield stress of the material, F is a linear function of the net-section stress (solid ...
... The denominator in equation (8) accounts for the nonlinearity of the material. An evaluation of the denominator for a given material is shown in Fig. 2. When the applied netsection stress is less than the uniaxial yield stress of the material, F is a linear function of the net-section stress (solid ...
Mechanical Properties and Fracture Patterns of Graphene (Graphitic
... (25A , 14A ) GNW, a ductile behaviour is observed and complete rupture is only obtained for strain values larger than 0.3. In this case, a more complex process of stress alleviation can be observed, with several successive steps, as shown in Fig. 2 (b), differing from the abrupt decrease observed fo ...
... (25A , 14A ) GNW, a ductile behaviour is observed and complete rupture is only obtained for strain values larger than 0.3. In this case, a more complex process of stress alleviation can be observed, with several successive steps, as shown in Fig. 2 (b), differing from the abrupt decrease observed fo ...
Module P7.6 Mechanical properties of matter
... Study comment Before beginning the study of this module you should have a clear understanding of the following terms from mechanics: energy, equilibrium, force, normal reaction force, frictional force, the gravitational force (weight) mg, centre of gravity, density, and work done by a force. In addi ...
... Study comment Before beginning the study of this module you should have a clear understanding of the following terms from mechanics: energy, equilibrium, force, normal reaction force, frictional force, the gravitational force (weight) mg, centre of gravity, density, and work done by a force. In addi ...
Comparison of Compression Behaviour of PU Foam and 3D
... lowest) and open (highest pleat’s angle). Similarly, 2 and 3 nonwovens show better physical characteristics than the nonwoven 1. Regarding the nonwoven 4, in spite of better physical characteristics, its poor strength could be explained by poor structure’s regularity. In this study, the samples were ...
... lowest) and open (highest pleat’s angle). Similarly, 2 and 3 nonwovens show better physical characteristics than the nonwoven 1. Regarding the nonwoven 4, in spite of better physical characteristics, its poor strength could be explained by poor structure’s regularity. In this study, the samples were ...
DOE Material Science 1
... subjects, which include Mathematics; Classical Physics; Thermodynamics, Heat Transfer, and Fluid Flow; Instrumentation and Control; Electrical Science; Material Science; Mechanical Science; Chemistry; Engineering Symbology, Prints, and Drawings; and Nuclear Physics and Reactor Theory. The handbooks ...
... subjects, which include Mathematics; Classical Physics; Thermodynamics, Heat Transfer, and Fluid Flow; Instrumentation and Control; Electrical Science; Material Science; Mechanical Science; Chemistry; Engineering Symbology, Prints, and Drawings; and Nuclear Physics and Reactor Theory. The handbooks ...
The role of chain length and conformation in stress
... with the activation energy for thermal destruction. The preexponential term τ0 was roughly the same for all polymers studied and of the order of 10−12 to 10−13 s. Similar relationships between stress and mechanical properties had been proposed independently by Tobolsky–Eyring (creep rate) and Bueche ...
... with the activation energy for thermal destruction. The preexponential term τ0 was roughly the same for all polymers studied and of the order of 10−12 to 10−13 s. Similar relationships between stress and mechanical properties had been proposed independently by Tobolsky–Eyring (creep rate) and Bueche ...
Analysis of process-induced residual stresses in tape placement
... of all, thermal expansion behavior of fiber-reinforced thermoplastic composites is highly anisotropic. This is due to the large discrepancy in the thermal expansion coefficients of the matrix and fiber materials. In a typical carbon-reinforced unidirectional thermoplastic composite, a temperature in ...
... of all, thermal expansion behavior of fiber-reinforced thermoplastic composites is highly anisotropic. This is due to the large discrepancy in the thermal expansion coefficients of the matrix and fiber materials. In a typical carbon-reinforced unidirectional thermoplastic composite, a temperature in ...
High cycle multiaxial fatigue crack initiation : experimental
... "critical" grains whose orientation, morphology and other parameters (neighbouring grain effects, free surface effects, etc.) create favourable conditions. Thus, the size of a REV in regards to fatigue can be very large, to the point that the computational tools currently available are not capable o ...
... "critical" grains whose orientation, morphology and other parameters (neighbouring grain effects, free surface effects, etc.) create favourable conditions. Thus, the size of a REV in regards to fatigue can be very large, to the point that the computational tools currently available are not capable o ...
Elastic response of cubic crystals to biaxial strain
... a nonlinear treatment is in many cases hindered by the limited knowledge of the higher-order elastic constants. An alternative approach to nonlinear elastic effects are systematic numerical studies using, e.g., DFT. Until now such investigations were mainly applied to isotropic strain and biaxial st ...
... a nonlinear treatment is in many cases hindered by the limited knowledge of the higher-order elastic constants. An alternative approach to nonlinear elastic effects are systematic numerical studies using, e.g., DFT. Until now such investigations were mainly applied to isotropic strain and biaxial st ...
Chapter 2
... pressure ranges 35 kPa to 100 MPa, and with a 50 mm bending diameter have a useful travel of approximately 3 mm. Such a tube has a hysteresis error of approximately 1-2% of full-scale deflection. The commercial bourdon pressure gauges have near elliptical xsection and the tube is usually. bent into ...
... pressure ranges 35 kPa to 100 MPa, and with a 50 mm bending diameter have a useful travel of approximately 3 mm. Such a tube has a hysteresis error of approximately 1-2% of full-scale deflection. The commercial bourdon pressure gauges have near elliptical xsection and the tube is usually. bent into ...
Viscoplasticity
Viscoplasticity is a theory in continuum mechanics that describes the rate-dependent inelastic behavior of solids. Rate-dependence in this context means that the deformation of the material depends on the rate at which loads are applied. The inelastic behavior that is the subject of viscoplasticity is plastic deformation which means that the material undergoes unrecoverable deformations when a load level is reached. Rate-dependent plasticity is important for transient plasticity calculations. The main difference between rate-independent plastic and viscoplastic material models is that the latter exhibit not only permanent deformations after the application of loads but continue to undergo a creep flow as a function of time under the influence of the applied load.The elastic response of viscoplastic materials can be represented in one-dimension by Hookean spring elements. Rate-dependence can be represented by nonlinear dashpot elements in a manner similar to viscoelasticity. Plasticity can be accounted for by adding sliding frictional elements as shown in Figure 1. In the figure E is the modulus of elasticity, λ is the viscosity parameter and N is a power-law type parameter that represents non-linear dashpot [σ(dε/dt)= σ = λ(dε/dt)(1/N)]. The sliding element can have a yield stress (σy) that is strain rate dependent, or even constant, as shown in Figure 1c.Viscoplasticity is usually modeled in three-dimensions using overstress models of the Perzyna or Duvaut-Lions types. In these models, the stress is allowed to increase beyond the rate-independent yield surface upon application of a load and then allowed to relax back to the yield surface over time. The yield surface is usually assumed not to be rate-dependent in such models. An alternative approach is to add a strain rate dependence to the yield stress and use the techniques of rate independent plasticity to calculate the response of a materialFor metals and alloys, viscoplasticity is the macroscopic behavior caused by a mechanism linked to the movement of dislocations in grains, with superposed effects of inter-crystalline gliding. The mechanism usually becomes dominant at temperatures greater than approximately one third of the absolute melting temperature. However, certain alloys exhibit viscoplasticity at room temperature (300K). For polymers, wood, and bitumen, the theory of viscoplasticity is required to describe behavior beyond the limit of elasticity or viscoelasticity. In general, viscoplasticity theories are useful in areas such as the calculation of permanent deformations, the prediction of the plastic collapse of structures, the investigation of stability, crash simulations, systems exposed to high temperatures such as turbines in engines, e.g. a power plant, dynamic problems and systems exposed to high strain rates.↑ ↑ ↑ ↑