Structure and Mechanical Properties of Fe-Mn Alloys
... characterized, and their mechanical properties were evaluated. Fe-30Mn possesses a single phase austenitic structure and its work hardening behaviour at room temperature can be interpreted by applying the Kocks and Mecking’s model. The persistent high work hardening rate of Fe-30Mn is attributed to ...
... characterized, and their mechanical properties were evaluated. Fe-30Mn possesses a single phase austenitic structure and its work hardening behaviour at room temperature can be interpreted by applying the Kocks and Mecking’s model. The persistent high work hardening rate of Fe-30Mn is attributed to ...
Mechanical Properties of Pedal Mucus and Their Consequences for
... approximately 108 N/m 2 as opposed to 103 N/m 2 for fully hydrated mucus, and its breaking strain is approximately 0.035, much lower than the 5-6 typical of hydrated pedal mucus. Accompanying this change in failure parameters is a change in the long term solidity of the mucus. A creep test performed ...
... approximately 108 N/m 2 as opposed to 103 N/m 2 for fully hydrated mucus, and its breaking strain is approximately 0.035, much lower than the 5-6 typical of hydrated pedal mucus. Accompanying this change in failure parameters is a change in the long term solidity of the mucus. A creep test performed ...
Stress relaxation behaviour in compression and some other
... Thermoplastic elastomer shows two Ltransition temperatures: a lower one corresponding to the freezing-in or appearance of molecular motion and upper one corresponding to the break down or restoration of the secondary valence cross-linking. Softening takes place within two temperature regions which m ...
... Thermoplastic elastomer shows two Ltransition temperatures: a lower one corresponding to the freezing-in or appearance of molecular motion and upper one corresponding to the break down or restoration of the secondary valence cross-linking. Softening takes place within two temperature regions which m ...
Prediction of stress-strain relationships in low
... undergo a partial rotation. The deformation that occurs before slip or rotation occur is an elastic deformation, and the specimen will recover its shape if unloaded; that deformation occurring as the result of slip or rotation is permanent and is termed plastic strain. It follows, therefore, that th ...
... undergo a partial rotation. The deformation that occurs before slip or rotation occur is an elastic deformation, and the specimen will recover its shape if unloaded; that deformation occurring as the result of slip or rotation is permanent and is termed plastic strain. It follows, therefore, that th ...
Ductile Ceramics
... the thermally-activated growth of microcracks. This process is said to dominate the compressive failure of some ceramics, such as Al2O3, SiC and Si3N4. An additional equation (Grady and Lipkin) predicts a transition from the dependence expressed by Eq. (2.3) to one given as: rc / e_ 1=3 ...
... the thermally-activated growth of microcracks. This process is said to dominate the compressive failure of some ceramics, such as Al2O3, SiC and Si3N4. An additional equation (Grady and Lipkin) predicts a transition from the dependence expressed by Eq. (2.3) to one given as: rc / e_ 1=3 ...
Acta Materialia_60_16_2012
... Hall-Petch effect of increasing strength with decrease in grain size [2-4], formation of Lüders bands [4], nucleation of deformation twins [5-7], cracks in fracture [7-9] and fatigue [10, 11], in the propagation of short fatigue cracks [12, 13] and in many more phenomena [14-16]. The configuration o ...
... Hall-Petch effect of increasing strength with decrease in grain size [2-4], formation of Lüders bands [4], nucleation of deformation twins [5-7], cracks in fracture [7-9] and fatigue [10, 11], in the propagation of short fatigue cracks [12, 13] and in many more phenomena [14-16]. The configuration o ...
Dislocations
... stress at which a crack will propagate and eventually fail The stress at which fracture occurs in a material is termed fracture strength For a brittle elastic solid this strength is estimated to be around E/10, E being the modulus of elasticity This strength is a function of the cohesive forces b ...
... stress at which a crack will propagate and eventually fail The stress at which fracture occurs in a material is termed fracture strength For a brittle elastic solid this strength is estimated to be around E/10, E being the modulus of elasticity This strength is a function of the cohesive forces b ...
Stress and Strain
... Another method of representing the results obtained in a uniaxial tension test is by first dividing the magnitude of the applied force F with the cross-sectional area A of the specimen, normalizing the amount of deformation by dividing the measured elongation with the original length of the specimen, ...
... Another method of representing the results obtained in a uniaxial tension test is by first dividing the magnitude of the applied force F with the cross-sectional area A of the specimen, normalizing the amount of deformation by dividing the measured elongation with the original length of the specimen, ...
Dislocation density evolution upon plastic deformation of Al-Pd
... The behaviour at the yield point, described by equations (3)± (7), that is a stress drop accompanied by an increase in the mobile dislocation density, is well known from crystalline materials (Johnston 1962, Alexander and Haasen 1968). In crystals at higher strains the density of dislocations increa ...
... The behaviour at the yield point, described by equations (3)± (7), that is a stress drop accompanied by an increase in the mobile dislocation density, is well known from crystalline materials (Johnston 1962, Alexander and Haasen 1968). In crystals at higher strains the density of dislocations increa ...
Catastrophic vs Gradual Collapse of Thin-Walled
... behavior that can arise at the nanoscale.10 It has been shown, for example, that at the nanometer scale, the ductility of a generally brittle polymer photoresist can be enhanced by 300% when the material is patterned into a microlattice architecture,11 that single-crystalline metals get stronger,12 ...
... behavior that can arise at the nanoscale.10 It has been shown, for example, that at the nanometer scale, the ductility of a generally brittle polymer photoresist can be enhanced by 300% when the material is patterned into a microlattice architecture,11 that single-crystalline metals get stronger,12 ...
on plastic void growth in strong ductile materials
... according to Eq. (4.14). The results are for Y /E = 1/500, and for three values of the hardening modulus k/E = 1/100, 1/50, and 1/25 (from lower to upper curve). ...
... according to Eq. (4.14). The results are for Y /E = 1/500, and for three values of the hardening modulus k/E = 1/100, 1/50, and 1/25 (from lower to upper curve). ...
Relationship between Yield stress and yield Strength on Various
... programming. The relationship can be used to predict the rolling load and torque for the material. Under the stress-strain behavior of steel, for SS316, increasing strain, ε, the equivalent stress increases during the initial work hardening stage to a maximum value and then falls to a steady-state f ...
... programming. The relationship can be used to predict the rolling load and torque for the material. Under the stress-strain behavior of steel, for SS316, increasing strain, ε, the equivalent stress increases during the initial work hardening stage to a maximum value and then falls to a steady-state f ...
Crystallographic preferred orientations may develop in
... so it is proposed that the generation of these materials facilitates shear localization and seismic slip. Such microstructures have been generated experimentally in high-velocity (<1 m s21) experiments with displacements ranging from 4 to 40 m conducted at room temperatures (e.g., silica gels repor ...
... so it is proposed that the generation of these materials facilitates shear localization and seismic slip. Such microstructures have been generated experimentally in high-velocity (<1 m s21) experiments with displacements ranging from 4 to 40 m conducted at room temperatures (e.g., silica gels repor ...
Strength of materials
... Toughness is the ability of a material to absorb energy and plastically deform without fracturing. Material toughness is defined as the amount of energy per volume that a material can absorb before rupturing. It is also defined as the resistance to fracture of a material when stressed. Fig. 5 shows ...
... Toughness is the ability of a material to absorb energy and plastically deform without fracturing. Material toughness is defined as the amount of energy per volume that a material can absorb before rupturing. It is also defined as the resistance to fracture of a material when stressed. Fig. 5 shows ...
p181B 01 09 2006 zhang
... Fig. 2. (a) Temperature history in a thermal-cycling test. (b) Optical micrograph of a fractured die surface after 1000 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 te ...
... Fig. 2. (a) Temperature history in a thermal-cycling test. (b) Optical micrograph of a fractured die surface after 1000 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 te ...
Defect accumulation behaviour in hcp metals and alloys - PolyU
... microstructure, and their dual function as both sources and sinks of point defects have to be taken into account. At low temperatures they are predominantly sinks which mainly acts as recombination centers, and at high temperatures they are predominantly sources, particularly the PVCs. The dierence ...
... microstructure, and their dual function as both sources and sinks of point defects have to be taken into account. At low temperatures they are predominantly sinks which mainly acts as recombination centers, and at high temperatures they are predominantly sources, particularly the PVCs. The dierence ...
An energy-based approach for estimates of the stress-strain
... Using the classical linear elastic fracture mechanics, the principal stresses in the solution for WS were left in terms of the well known stress intensity factor. This parameter is believed to be the characteristic variable for crack-like notches. On the other hand, the Wσ was estimated by integrati ...
... Using the classical linear elastic fracture mechanics, the principal stresses in the solution for WS were left in terms of the well known stress intensity factor. This parameter is believed to be the characteristic variable for crack-like notches. On the other hand, the Wσ was estimated by integrati ...
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. ...
L6-Imperfections
... and Polanyi in 1934 as a way of explaining two key observations about the plastic deformation of crystalline material: o The stress required to plastically deform a crystal is much less than the stress one calculates from considering a defect-free crystal structure o Materials work-harden: when a ma ...
... and Polanyi in 1934 as a way of explaining two key observations about the plastic deformation of crystalline material: o The stress required to plastically deform a crystal is much less than the stress one calculates from considering a defect-free crystal structure o Materials work-harden: when a ma ...
Chapter 3 Fracture
... materials the rupture strength and the ultimate strength are the same. Ductile material (such as steel) generally exhibits a very linear stress-strain relationship up to a well defined yield point . The linear portion of the curve is the elastic region and the slope is the modulus of elasticity or Y ...
... materials the rupture strength and the ultimate strength are the same. Ductile material (such as steel) generally exhibits a very linear stress-strain relationship up to a well defined yield point . The linear portion of the curve is the elastic region and the slope is the modulus of elasticity or Y ...
The role of chain length and conformation in stress
... of G Ic of about 300 Jm−2 has been determined, which is several orders of magnitude smaller than the fracture energy of a mono-crystal, where primary bonds are loaded and broken [5]. (It should be noted that in that case most of the fracture energy is loss of elastic energy when the highly loaded ch ...
... of G Ic of about 300 Jm−2 has been determined, which is several orders of magnitude smaller than the fracture energy of a mono-crystal, where primary bonds are loaded and broken [5]. (It should be noted that in that case most of the fracture energy is loss of elastic energy when the highly loaded ch ...
Stress
... Beside the two fundamental types of stress (normal and shear), another type of stress, the so-called volumetric stress (V) is also important in engineering practice. A volumetric stress field occurs when an elastic body is equally loaded by compressional forces in all directions. In nature, hydrost ...
... Beside the two fundamental types of stress (normal and shear), another type of stress, the so-called volumetric stress (V) is also important in engineering practice. A volumetric stress field occurs when an elastic body is equally loaded by compressional forces in all directions. In nature, hydrost ...
Strain Rate Dependent Flow Stress Characterization
... The adaptation of metal forming processes from conventional size to micro size has been hindered due to the size effects. Although they are only observed in miniaturized processes, these size effects are not caused by physical or chemical phenomena occurring in scaled down systems but rather they ar ...
... The adaptation of metal forming processes from conventional size to micro size has been hindered due to the size effects. Although they are only observed in miniaturized processes, these size effects are not caused by physical or chemical phenomena occurring in scaled down systems but rather they ar ...
Final program with abstracts - Laboratoire de Glaciologie et
... At elevated temperatures crystalline solids deform and recrystallize by a variety of mechanisms involving the basic processes of dislocation motion, grain boundary migration/sliding and progressive subgrain rotation. At high strains a stable microstructure (size, shape and internal structure of grai ...
... At elevated temperatures crystalline solids deform and recrystallize by a variety of mechanisms involving the basic processes of dislocation motion, grain boundary migration/sliding and progressive subgrain rotation. At high strains a stable microstructure (size, shape and internal structure of grai ...
Creep (deformation)
In materials science, creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods, and generally increases as they near their melting point.The rate of deformation is a function of the material properties, exposure time, exposure temperature and the applied structural load. Depending on the magnitude of the applied stress and its duration, the deformation may become so large that a component can no longer perform its function — for example creep of a turbine blade will cause the blade to contact the casing, resulting in the failure of the blade. Creep is usually of concern to engineers and metallurgists when evaluating components that operate under high stresses or high temperatures. Creep is a deformation mechanism that may or may not constitute a failure mode. For example, moderate creep in concrete is sometimes welcomed because it relieves tensile stresses that might otherwise lead to cracking.Unlike brittle fracture, creep deformation does not occur suddenly upon the application of stress. Instead, strain accumulates as a result of long-term stress. Therefore, creep is a ""time-dependent"" deformation.The temperature range in which creep deformation may occur differs in various materials. For example, tungsten requires a temperature in the thousands of degrees before creep deformation can occur, while ice will creep at temperatures near 0 °C (32 °F). As a general guideline, the effects of creep deformation generally become noticeable at approximately 30% of the melting point (as measured on a thermodynamic temperature scale such as Kelvin or Rankine) for metals, and at 40–50% of melting point for ceramics. Virtually any material will creep upon approaching its melting temperature. Since the creep minimum temperature is related to the melting point, creep can be seen at relatively low temperatures for some materials. Plastics and low-melting-temperature metals, including many solders, can begin to creep at room temperature, as can be seen markedly in old lead hot-water pipes. Glacier flow is an example of creep processes in ice.