Innovative Simulations of Sheet Metal Forming Processes
... Simulation of the manufacturing of disk carriers by roll-forming The growing spread of direct-shift-gearboxes in the automotive industry has led to a strong demand of corresponding gearbox components. A number of different metal forming processes can be used for the manufacturing of the so called di ...
... Simulation of the manufacturing of disk carriers by roll-forming The growing spread of direct-shift-gearboxes in the automotive industry has led to a strong demand of corresponding gearbox components. A number of different metal forming processes can be used for the manufacturing of the so called di ...
Aging Performance in Crystals - Connor
... To improve aging performance, or to insure spec compliance, accurate measurements are key. There are several methods that can be used, each allowing for trade offs of time, cost, and accuracy. The true aging of a device can only be measured by placing it in circuit and frequency over the life of the ...
... To improve aging performance, or to insure spec compliance, accurate measurements are key. There are several methods that can be used, each allowing for trade offs of time, cost, and accuracy. The true aging of a device can only be measured by placing it in circuit and frequency over the life of the ...
Physics, Chapter 13: Properties of Matter
... composing it always occur in a definite ratio of their weights. More complex substances consist of several or many compounds. The smallest constituent of a chemical compound is the molecule; it is the fundamental structural unit of the compound. A molecule is composed of one or more atoms held toget ...
... composing it always occur in a definite ratio of their weights. More complex substances consist of several or many compounds. The smallest constituent of a chemical compound is the molecule; it is the fundamental structural unit of the compound. A molecule is composed of one or more atoms held toget ...
Chapter 12
... When the stress exceeds the elastic limit, the substance will be permanently deformed. The curve is no longer a straight line. With additional stress, the material ultimately breaks. ...
... When the stress exceeds the elastic limit, the substance will be permanently deformed. The curve is no longer a straight line. With additional stress, the material ultimately breaks. ...
12.3 - De Anza
... When the stress exceeds the elastic limit, the substance will be permanently deformed. § The curve is no longer a straight line. With additional stress, the material ultimately breaks. ...
... When the stress exceeds the elastic limit, the substance will be permanently deformed. § The curve is no longer a straight line. With additional stress, the material ultimately breaks. ...
Hard Materials with Functionally Designed Mesostructure
... been little research on the effect of the mesostructure and how to obtain materials with hierarchical structure to maximize properties. This poster presents some recent work on improving the fracture toughness of hard and superhard materials without sacrificing their wear resistance by using functio ...
... been little research on the effect of the mesostructure and how to obtain materials with hierarchical structure to maximize properties. This poster presents some recent work on improving the fracture toughness of hard and superhard materials without sacrificing their wear resistance by using functio ...
Module
... Stresses computed on the basis of the original area of the specimen are often referred to as the conventional or nominal stresses. Alternately, the stresses computed on the basis of the actual area of the specimen gives the so called true stress. Within the elastic limit, the material returns to it ...
... Stresses computed on the basis of the original area of the specimen are often referred to as the conventional or nominal stresses. Alternately, the stresses computed on the basis of the actual area of the specimen gives the so called true stress. Within the elastic limit, the material returns to it ...
Dynamic Behavior of Polymer at High Strain Rate
... As pointed out by [11], in order to facilitate dynamic stress equilibrium and constant strain rate in a low-impedance specimen, a pulse shaper must be used. The sensing block undergoes the loading signal from the specimen; the latter will be in dynamic equilibrium. This technique was also used by [9 ...
... As pointed out by [11], in order to facilitate dynamic stress equilibrium and constant strain rate in a low-impedance specimen, a pulse shaper must be used. The sensing block undergoes the loading signal from the specimen; the latter will be in dynamic equilibrium. This technique was also used by [9 ...
1 Stress in 3D
... sign conventions, stress visualization, and reduction to two- and one-dimensional cases. Effect of coordinate axes transformation and the notion of tensors are briefly mentioned as advanced topics. §1.2. Mechanical Stress: Concept Mechanical stress in a solid body is a gross abstraction of the inten ...
... sign conventions, stress visualization, and reduction to two- and one-dimensional cases. Effect of coordinate axes transformation and the notion of tensors are briefly mentioned as advanced topics. §1.2. Mechanical Stress: Concept Mechanical stress in a solid body is a gross abstraction of the inten ...
View - OhioLINK Electronic Theses and Dissertations Center
... stiffening structures, a prior knowledge to estimate the size of a stable time is lacking (it varies with deformations); (b) a carefully designed user material routines are needed to bypass the many restrictions and assumptions implied in the provided kinematical quantities communicated by the main ...
... stiffening structures, a prior knowledge to estimate the size of a stable time is lacking (it varies with deformations); (b) a carefully designed user material routines are needed to bypass the many restrictions and assumptions implied in the provided kinematical quantities communicated by the main ...
Sora to Sora No.50
... thrust and weight, the structure of an aircraft is subjected to large forces, such as pressurization loading. The aircraft must have a lightweight construction while maintaining the strength and rigidity to withstand these forces. In order to realize this basic design, it is very important to know h ...
... thrust and weight, the structure of an aircraft is subjected to large forces, such as pressurization loading. The aircraft must have a lightweight construction while maintaining the strength and rigidity to withstand these forces. In order to realize this basic design, it is very important to know h ...
738_1.pdf
... optical phonons, respectively. Note that for zincblendetype crystals such as GaAs, the degeneracy of the LO and TO phonons at q=0 is lifted by the internal electric field associated with the LO phonon mode. Hydrostatic strain shifts the phonon frequencies without altering the symmetry of the crystal ...
... optical phonons, respectively. Note that for zincblendetype crystals such as GaAs, the degeneracy of the LO and TO phonons at q=0 is lifted by the internal electric field associated with the LO phonon mode. Hydrostatic strain shifts the phonon frequencies without altering the symmetry of the crystal ...
ME 207 – Material Science I
... 5. In relation with above case, suppose that bar length is fixed as 350 mm and radius as 7 mm, and elongation of up to 0.464 mm is permissible. The respective weights will be WAl = 0.143 kg and WSt = 0.412 kg. Such difference in results of case 4 & 5 states that a design problem relies completely up ...
... 5. In relation with above case, suppose that bar length is fixed as 350 mm and radius as 7 mm, and elongation of up to 0.464 mm is permissible. The respective weights will be WAl = 0.143 kg and WSt = 0.412 kg. Such difference in results of case 4 & 5 states that a design problem relies completely up ...
lithospheric strength profiles
... One can observe the nature of the deformation and describe mathematically the specific relationships between stress and strain, more precisely between the rate of application of stress and the rate of deformation, by experimentally subjecting rocks to forces and stresses under controlled conditions. ...
... One can observe the nature of the deformation and describe mathematically the specific relationships between stress and strain, more precisely between the rate of application of stress and the rate of deformation, by experimentally subjecting rocks to forces and stresses under controlled conditions. ...
Catastrophic vs Gradual Collapse of Thin-Walled
... dimensions. Under such conditions, interactions between the limiting external dimensions, i.e., truss wall thickness, and the microstructural parameter, i.e. grain size, can drastically alter mechanical strength, as has been shown for a large variety of small-scale metallic structures.12,1416 Howev ...
... dimensions. Under such conditions, interactions between the limiting external dimensions, i.e., truss wall thickness, and the microstructural parameter, i.e. grain size, can drastically alter mechanical strength, as has been shown for a large variety of small-scale metallic structures.12,1416 Howev ...
I. Introduction and Basic Concepts A. Stress: force applied to rock
... stress difference = σ1 - σ3 σ1 and σ3 plotted as points on the x-axis of the Mohr diagram (i.e. plotted on normal stress axis) σ1 and σ3 define unique points that lie on the envelope of the Mohr Circle, and on the σn axis, ...
... stress difference = σ1 - σ3 σ1 and σ3 plotted as points on the x-axis of the Mohr diagram (i.e. plotted on normal stress axis) σ1 and σ3 define unique points that lie on the envelope of the Mohr Circle, and on the σn axis, ...
a cohesive elements based model to describe fracture and cohesive
... interface. Different parameters such as contact time, temperature, pressure or chemical activity determine the degree of healing obtained. In this work, a numerical simulation of the healing efficiency as a function of the environment is proposed based on the use of cohesive elements in a finite ele ...
... interface. Different parameters such as contact time, temperature, pressure or chemical activity determine the degree of healing obtained. In this work, a numerical simulation of the healing efficiency as a function of the environment is proposed based on the use of cohesive elements in a finite ele ...
Analysis of the Service Straining on the Beam
... Faculty of mechanical engineering STU in Bratislava. Amzallag,C.,Gerey,P.,Robert,J.L.,Bahuaudt,J. (1994). Standardization of the Rainflow Counting Method for Fatigue Analysis. International Journal of Fatigue, 16, 287 Kliman,V. (1998). Probabilistic approach of evaluation of the fatigue lifetime. Me ...
... Faculty of mechanical engineering STU in Bratislava. Amzallag,C.,Gerey,P.,Robert,J.L.,Bahuaudt,J. (1994). Standardization of the Rainflow Counting Method for Fatigue Analysis. International Journal of Fatigue, 16, 287 Kliman,V. (1998). Probabilistic approach of evaluation of the fatigue lifetime. Me ...
Strain state in silicon structures for microprocessor technology M.
... techniques, and Raman spectroscopy, can be applied. Among these, Raman spectroscopy has not only an excellent lateral resolution reaching the sub-micron scale, but has the potential to be scaled down to the nm-range by combining it with near-field optical techniques. The experimental challenges of m ...
... techniques, and Raman spectroscopy, can be applied. Among these, Raman spectroscopy has not only an excellent lateral resolution reaching the sub-micron scale, but has the potential to be scaled down to the nm-range by combining it with near-field optical techniques. The experimental challenges of m ...
Stress relaxation in aging soft colloidal glasses
... a jammed state limits their diffusive movement beyond the cage dimensions, leading to an incomplete relaxation process and restricted access to the phase space.2 The relaxation phenomena of such systems can be studied by analyzing the temporal behaviors of the response functions, which typically exh ...
... a jammed state limits their diffusive movement beyond the cage dimensions, leading to an incomplete relaxation process and restricted access to the phase space.2 The relaxation phenomena of such systems can be studied by analyzing the temporal behaviors of the response functions, which typically exh ...
p181B 01 09 2006 zhang
... temperature cycles. (c) SEM micrograph with a FIB cut. the edges and corners of the die. During a thermal-cycling test, the high-end temperature (1500C) is lower than the curing temperature (1750C). Consequently, at each corner or edge of the die, the magnitude of the shear stress varies with the te ...
... temperature cycles. (c) SEM micrograph with a FIB cut. the edges and corners of the die. During a thermal-cycling test, the high-end temperature (1500C) is lower than the curing temperature (1750C). Consequently, at each corner or edge of the die, the magnitude of the shear stress varies with the te ...
History, Uses, and Physical Characteristics of Steel Pipe
... The traditional steel-making process is performed by pouring (teeming) molten steel into a series of molds to form castings known as ingots. The ingots are removed from the molds, reheated, then rolled into products with square or rectangular cross sections. This hot-rolling operation elongates the ...
... The traditional steel-making process is performed by pouring (teeming) molten steel into a series of molds to form castings known as ingots. The ingots are removed from the molds, reheated, then rolled into products with square or rectangular cross sections. This hot-rolling operation elongates the ...
electrical resistance stain gauge
... • Designed by Carlson and Eaton in 1930. • It is constructed by winding wire in three coils which are placed under initial tension into four arm wheatstone Bridge. ...
... • Designed by Carlson and Eaton in 1930. • It is constructed by winding wire in three coils which are placed under initial tension into four arm wheatstone Bridge. ...
Lecture #19 Creep in Metals: - References:
... - Primary or transient: in which the creep resistance increases with strain leading to a decreasing creep strain rate. - Secondary (Steady State), or quasi viscous: in which there is a balance between work hardening and recovery processes, leading to a minimum constant creep rate. - Tertiary creep: ...
... - Primary or transient: in which the creep resistance increases with strain leading to a decreasing creep strain rate. - Secondary (Steady State), or quasi viscous: in which there is a balance between work hardening and recovery processes, leading to a minimum constant creep rate. - Tertiary creep: ...
Strength of materials
... Three other elastic moduli are Poisson's ratio, Lamé's first parameter, and P-wave modulus. Young's modulus is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. It is defined as the ratio of the uniaxial stress over the uniaxial strain in the range o ...
... Three other elastic moduli are Poisson's ratio, Lamé's first parameter, and P-wave modulus. Young's modulus is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. It is defined as the ratio of the uniaxial stress over the uniaxial strain in the range o ...
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.↑ ↑ ↑ ↑