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Simple Stresses and Strains
Published in B. Raghu Kumar, Strength of Materials, 2022
Or σ=Eε where E is constant of property of the material known as Modulus of elasticity (or) young’s modulus of elasticity. Similar equation can be written for shear stress and shear strain. The units for young’s modulus is Pascal (same as the stress units).
Glass Processing and Properties
Published in Debasish Sarkar, Ceramic Processing, 2019
The elasticity behavior of glass shows that it is a perfectly elastic material, as it cannot be permanently deformed until breakage. Young modulus is a coefficient of elasticity of a material and is expressed as the ratio between a stress that acts to change the length of a body and the fractional change in length caused by this force. For float glass, it is 72 GPa [25]. The more a material resists deformation, the higher is the value of the elastic modulus. Young modulus is dependent on the glass composition, which affects the final stress level of tempered glass. A small change in tempering parameters can change the elastic modulus of an identical composition of glass, resulting in a different degree of elastic modulus from manufacture to manufacture. Compressive strength is the resistance of a material to compressive stress. Glass is extremely resilient to pressure up to 700–900 MPa. Flat glass can withstand a compressive load 10 times greater than the tensile load.
Properties of Clean Surfaces: Adhesion, Friction, and Wear
Published in Kazuhisa Miyoshi, Solid Lubrication Fundamentals and Applications, 2019
The values of the Young’s and shear moduli used in this investigation of bulk polycrystalline metal were those reported by Gschneidner [3.31]. Young’s modulus varies from 3.538 GPa (0.0361 ×106 kg/cm2) for potassium to 1127 GPa (11.5 × 106 kg/cm2) for diamond. Estimated values, however, would indicate that the lower limit is probably 1.6 GPa (0.017 × 106 kg/cm2) for francium. A recent calculation for a hypothetical material, carbon nitride in β-C3N4 structure, predicted a bulk modulus comparable to that for diamond (β = 410 to 440 GPa) [3.34, 3.35]. Gschneidner reported that the ratio of Young’s modulus to shear modulus is essentially constant (at nearly 2.6) and that the shear modulus, like Young’s modulus, markedly depends on the metal’s electron configuration (i.e., the group in which it lies). The maximum value encountered in a given period of the periodic table is associated with the elements having the most unpaired d electrons. The minimum near the end of each period occurs for the elements having an s2p1 configuration.
Structural stability, electronic and mechanical properties of transition metal nitrides TMN compounds (TM=Zn, Mn and Tc)
Published in Phase Transitions, 2021
Pushplata Shukla, Sadhna Singh
Young’s modulus (Y) is a measurement of the stiffness of the materials which is the ratio of tensile stress to the corresponding tensile strain. The larger values of the Young modulus (Y) show that material is stiffer, so it is clear from Table 4 that MnN compound with the highest value for (Y) is stiffer than ZnN and TcN. The calculated values of the shear modulus (G), the bulk modulus (B) and the Young modulus (Y) are given in Figure 4(a–c), respectively. Our estimated results have been compared with the first-principle linearized augmented plane wave method, accomplished by Rajeshwarapalanichmay et al. [22–24].
The evolution of the micro-morphology and micro-structure of particles from diesel engine in combination with exhaust gas recirculation
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2018
Yang Zhao, Guangju Xu, Mingdi Li, Qingzhang Chen
According to Hooke’s law, stress is proportional to strain within the limit of elasticity of the material; this ratio is called Young’s modulus. Young’s modulus is a physical property that defines a material’s properties and is only related to the intrinsic properties of the material. Young’s modulus is a measure of the stiffness of a material; the greater Young’s modulus is, the greater the structural rigidity of the material is, and it is more difficult to deform. To investigate the effect of the EGR on the structural rigidity of the particles, AFM was used to characterize the nanomechanical properties of the particles.
Experimental and numerical analysis of nanoindentation of Ti-6246 alloy
Published in Particulate Science and Technology, 2018
Muhammad Irfan Khan, Abdul Shakoor, Khizar Azam, Muddasar Habib, Riaz Muhammad, Shoukat Ali Shah, Afzal Khan
Young’s modulus is very important mechanical property as it gives us the information about the strain corresponding to applied stress. Nanoindentation gives researchers an easy alternative to find the Young’s modulus value of a wide scope of engineering materials with very little compromise on accuracy. The Young’s modulus values obtained for Ti-6246 in this work are tabulated in Table 4.