Persson2006-Contact_mechanics_for_randomly_rough_+

... contact regions. For small squeezing force it predicts that the contact area A is proportional to the load FN , while as FN increases A approaches A0 in a continuous manner. Thus, the theory is (approximately) valid for all squeezing forces. In addition, the theory is very flexible and can be applie ...

... contact regions. For small squeezing force it predicts that the contact area A is proportional to the load FN , while as FN increases A approaches A0 in a continuous manner. Thus, the theory is (approximately) valid for all squeezing forces. In addition, the theory is very flexible and can be applie ...

high strain rate behaviour of woven composite

... model to predict their response under high strain rate loading. The current available models do not include rate effects, are too complicated to use, are unable to provide a clear procedure for characterizing the model parameters, or are unable to accurately predict response when compared to experim ...

... model to predict their response under high strain rate loading. The current available models do not include rate effects, are too complicated to use, are unable to provide a clear procedure for characterizing the model parameters, or are unable to accurately predict response when compared to experim ...

Chapter 10 Elasticity & Oscillations

... An elastic object is one that returns to its original size and shape after contact forces have been removed. If the forces acting on the object are too large, the object can be permanently distorted. ...

... An elastic object is one that returns to its original size and shape after contact forces have been removed. If the forces acting on the object are too large, the object can be permanently distorted. ...

An Investigation of Anterior Cruciate Ligament Injuries and Analysis

... surgical process and finding grafts that will suffice for the stresses endured on the knee during physical activity. I’m studying ACLs because of the high percentage of athletes that tear their ACL. Also, I tore my ACL in April and had surgery in May 2013, so I have a MRI scan of my knee that I will ...

... surgical process and finding grafts that will suffice for the stresses endured on the knee during physical activity. I’m studying ACLs because of the high percentage of athletes that tear their ACL. Also, I tore my ACL in April and had surgery in May 2013, so I have a MRI scan of my knee that I will ...

Ductile Ceramics

... superplastic deformation, discussed below in Sect. 2.2c. 2.1.1.2 Ductility and Strength Not unlike the case of superplastic ceramics, ductility and strength relations are influenced by strain rate. The conditions of the experiment must be above the DBT to observe plastic flow, which is different for ...

... superplastic deformation, discussed below in Sect. 2.2c. 2.1.1.2 Ductility and Strength Not unlike the case of superplastic ceramics, ductility and strength relations are influenced by strain rate. The conditions of the experiment must be above the DBT to observe plastic flow, which is different for ...

Stress relaxation behaviour in compression and some other

... usually taken as family name for material that have long chain molecules. The term plastic is applied when additives are present in polymer (1). A polymer may be defined as a large molecule constructed from many smaller structural units called monomers or mers, covalently bonded together. It is more ...

... usually taken as family name for material that have long chain molecules. The term plastic is applied when additives are present in polymer (1). A polymer may be defined as a large molecule constructed from many smaller structural units called monomers or mers, covalently bonded together. It is more ...

Vectors and Moments

... their components on an arbitrary basis (see Appendix A). Vectors like those described above are called free vectors. Examples of free vectors are the angular velocity of a rigid body and a torque applied to a rigid body. The eﬀect of the action of a force on a rigid body depends on the former’s line ...

... their components on an arbitrary basis (see Appendix A). Vectors like those described above are called free vectors. Examples of free vectors are the angular velocity of a rigid body and a torque applied to a rigid body. The eﬀect of the action of a force on a rigid body depends on the former’s line ...

Bounding the plastic strength of polycrystalline solids by linear

... non-hardening. Within this the so-called rigid–perfectly plastic model, the above problem reduces to ﬁnding the macroscopic yield surface of the polycrystal given the yield surface at the single-crystal level and the statistics of the morphology and orientation distributions of the grains. Owing to ...

... non-hardening. Within this the so-called rigid–perfectly plastic model, the above problem reduces to ﬁnding the macroscopic yield surface of the polycrystal given the yield surface at the single-crystal level and the statistics of the morphology and orientation distributions of the grains. Owing to ...

Dynamics and mechanics of motor

... constants do not fulfill the Einstein relation. In contrast, unbound motors are assumed to simply diffuse thermally with diffusion constant Du . The translational and the rotational filament currents, Ja and Jr , as well as the motor current Jb are generated by active interactions between motors and ...

... constants do not fulfill the Einstein relation. In contrast, unbound motors are assumed to simply diffuse thermally with diffusion constant Du . The translational and the rotational filament currents, Ja and Jr , as well as the motor current Jb are generated by active interactions between motors and ...

Determination of shear strength of unidirectional composite

... Voyiadjis and Thiagarajan [30] have proposed a pressure-dependent yield surface for transversely isotropic materials. The invariant-based ¯ow rule and the pressure-dependent transverse isotropic yield function are used in this paper to model the non-linear behavior of the Ciba-Geigy XAS/9l4 unidirec ...

... Voyiadjis and Thiagarajan [30] have proposed a pressure-dependent yield surface for transversely isotropic materials. The invariant-based ¯ow rule and the pressure-dependent transverse isotropic yield function are used in this paper to model the non-linear behavior of the Ciba-Geigy XAS/9l4 unidirec ...

Chapter 3 Vectors

... The graphical method of adding vectors is not recommended whenever high accuracy is required or in three-dimensional problems. In this section, we describe a method of adding vectors that makes use of the projections of vectors along coordinate axes. These projections are called the components of th ...

... The graphical method of adding vectors is not recommended whenever high accuracy is required or in three-dimensional problems. In this section, we describe a method of adding vectors that makes use of the projections of vectors along coordinate axes. These projections are called the components of th ...

ElaStic: A universal tool for calculating elastic constants from first

... calculate the full second-order elastic stiffness tensor for any crystal structure from ab initio total-energy and/or stress calculations. This tool also provides the elastic compliances tensor and applies the Voigt and Reuss averaging procedure in order to obtain an evaluation of the bulk, shear, a ...

... calculate the full second-order elastic stiffness tensor for any crystal structure from ab initio total-energy and/or stress calculations. This tool also provides the elastic compliances tensor and applies the Voigt and Reuss averaging procedure in order to obtain an evaluation of the bulk, shear, a ...

Mechanical Properties and Fracture Patterns of Graphene (Graphitic

... is performed in order to eliminate any residual stress from thermal effects. After this, we used a NVT ensemble and continuously (until mechanical failure) stretched the structure by applying strain along the periodic directions. Stress values were computed at each time step. We adopted a strain rat ...

... is performed in order to eliminate any residual stress from thermal effects. After this, we used a NVT ensemble and continuously (until mechanical failure) stretched the structure by applying strain along the periodic directions. Stress values were computed at each time step. We adopted a strain rat ...

Martinec-ContinuumMechanics.pdf

... referential description is often called the Lagrangian description, although many authors ~ in the reference configuration as call it the material description, using the particle position X a label for the material particle X in the material description. • Spatial description, whose independent vari ...

... referential description is often called the Lagrangian description, although many authors ~ in the reference configuration as call it the material description, using the particle position X a label for the material particle X in the material description. • Spatial description, whose independent vari ...

The fracture toughness of a cordierite square lattice

... the x1 direction, see Fig. 2. The stress intensity factor was then extracted via the virtual crack extension method within ABAQUS. The calibration is performed for the practical choice of geometry a=H ¼ 1=2. Results are shown in Fig. 3a for q in the range 1 < q 6 4. For q P 0 the calibration functi ...

... the x1 direction, see Fig. 2. The stress intensity factor was then extracted via the virtual crack extension method within ABAQUS. The calibration is performed for the practical choice of geometry a=H ¼ 1=2. Results are shown in Fig. 3a for q in the range 1 < q 6 4. For q P 0 the calibration functi ...

elastic deformation

... Front view of Cube, Edge Length = Lo strains in E 45 lecture, and in statics, mechanics of materials, structures, and machine design courses. Usually the forces acting on a body are normalized by dividing the force by the area of the surface it's acting on to get a "force intensity". The force inten ...

... Front view of Cube, Edge Length = Lo strains in E 45 lecture, and in statics, mechanics of materials, structures, and machine design courses. Usually the forces acting on a body are normalized by dividing the force by the area of the surface it's acting on to get a "force intensity". The force inten ...

Stress relaxation in aging soft colloidal glasses

... observation later in this section. From Fig. 2, it can be seen that the fast relaxation process decays as a power law, indicating a distribution of relaxation times. The time required for the fast process to decay, which can be roughly estimated to be 1–2 s, is approximately independent of g. Previo ...

... observation later in this section. From Fig. 2, it can be seen that the fast relaxation process decays as a power law, indicating a distribution of relaxation times. The time required for the fast process to decay, which can be roughly estimated to be 1–2 s, is approximately independent of g. Previo ...

DOE Material Science 1

... DOE Category A reactor training managers determined which materials should be included, and served as a primary reference in the initial development phase. Training guidelines from the commercial nuclear power industry, results of job and task analyses, and independent input from contractors and ope ...

... DOE Category A reactor training managers determined which materials should be included, and served as a primary reference in the initial development phase. Training guidelines from the commercial nuclear power industry, results of job and task analyses, and independent input from contractors and ope ...

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 ...

Strain state in silicon structures for microprocessor technology M.

... A promising approach to improve the performance of present CMOS devices is to introduce mechanical strain into the channel regions below the transistor gates. Strain can be generated as global strain on the whole wafer level (e.g., by growing strained silicon films on strain-relaxed silicon–germaniu ...

... A promising approach to improve the performance of present CMOS devices is to introduce mechanical strain into the channel regions below the transistor gates. Strain can be generated as global strain on the whole wafer level (e.g., by growing strained silicon films on strain-relaxed silicon–germaniu ...

CIS009-2, Mechatronics Mechanical Fundamentals: Forces and Equilibrium David Goodwin

... According to Newton’s 2nd law: F = ma. We approximate the acceleration due to gravity as constant (since in normal calculations, variations in height would be small compared to the radius of the earth). We denote this acceleration by the symbol g = 9.81ms−1 (metres per second). Since the direc ...

... According to Newton’s 2nd law: F = ma. We approximate the acceleration due to gravity as constant (since in normal calculations, variations in height would be small compared to the radius of the earth). We denote this acceleration by the symbol g = 9.81ms−1 (metres per second). Since the direc ...

Fluid reservoirs in the crust and mechanical coupling between the... lower crust Bruce E Hobbs , Alison Ord

... significance of fluid filled regions in the crust it is fundamental that we first establish the fluid pressure distribution in the crust; we consider this in Section 2. If one equates the pore fluid pressure with the mean stress and follows the discussions of Petrini and Podladchikov (2000) and Stuw ...

... significance of fluid filled regions in the crust it is fundamental that we first establish the fluid pressure distribution in the crust; we consider this in Section 2. If one equates the pore fluid pressure with the mean stress and follows the discussions of Petrini and Podladchikov (2000) and Stuw ...

Acta Materialia_60_16_2012

... obtained using in-situ observation and static post-test analysis and their micrographs demonstrate that post-test analysis produces a sharper observation of the local plasticity event (i.e. giving clear lines indicating the dislocations and a sharp interface at the grain boundary). In this forward m ...

... obtained using in-situ observation and static post-test analysis and their micrographs demonstrate that post-test analysis produces a sharper observation of the local plasticity event (i.e. giving clear lines indicating the dislocations and a sharp interface at the grain boundary). In this forward m ...

Effect of material and geometric parameters on deformations near

... point integration rule, the conditionally stable central-difference method for time integration, and an hour-glass control algorithm to suppress the spurious modes. The finite element mesh shown in Figure 2 has sixty elements around the notch-tip, and the element size gradually increases with distan ...

... point integration rule, the conditionally stable central-difference method for time integration, and an hour-glass control algorithm to suppress the spurious modes. The finite element mesh shown in Figure 2 has sixty elements around the notch-tip, and the element size gradually increases with distan ...