Gcse science physics (9-1) forces and elasticity youtube. Modulus. BTec National - Direct Stress, Strain and Modulus of Elasticity (PowerPoint) (no rating) 0 customer reviews. In this booster, you will learnHow to calculate Modulus of Elasticity of concrete? a) Young’s Modulus(Y) or modulus corresponding to longitudinal strain b) Bulk modulus(K) or modulus corresponding to the volume strain c) Rigidity modulus(N) or modulus … MODULUS OF ELASTICITY. You can change your ad preferences anytime. Calculate the theoretical values the Young’s Modulus and Poisson’s ratio. Physics 207: lecture 2 notes. Modulus of elasticity is the measure of the stress–strain relationship on the object. h�b```b````a``y� �� @1V �Ȥgb0 ��s]͏�2qǲJ1e6`2c��|�u �=�,լ����Z,���X%Y������������,��ǔR �T�Շi��������U����@�d���Z�1RK}��CV�-3=�*��Ӫ�c�xA�5���^���eeoI��U��X ֯@mn��@ً
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��0���� ��^��Z�� D@��^��2�wt4��%a"\@c:PE� Do you have PowerPoint slides to share? Modulus of Rigidity The modulus of rigidity, also called shear modulus, indi-cates the resistance to deflection of a member caused by shear stresses. An IMT‐HTP‐100F servo‐controlled high‐temperature test machine, developed by the authors, was used to measure the elastic modulus of the mudstone. In our previous example, the stress applied to the steel wire was 6.37 x 107 Pa and the strain was 3.08 x 10-4. 7. Continents: 150 km lithosphere comprising 35 km-thick crust – has elevation of about 400 m (average continental elevation worldwide). ENGINEERING PHYSICS. stress Modulus of Elasticity strain Flexural strength (bending strength or modulus of rupture)—Force per unit area at the instant of fracture in a test specimen subjected to flexural loading. The determination of the modulus of elasticity for cylindrical concrete samples such as molded cylinders and drilled cores is outlined in this procedure. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Depending upon the three of strain, there are three types of elastic moduli, viz. For isotropic materials it is the relationship among elastic parameters, modulus of elasticity, shear modulus and Poisson’s ratio. To determine Young’s modulus of elasticity of the material of a given wire. Elasticpotentialenergy. Study of Elastic Modulus and Yield Strength of Polymer Thin Films Using Atomic Force Microscopy. In this study, we designed an experiment to measure the elastic modulus of amorphous Al 2 O 3 films with thicknesses varying between 2 and 25 nm. Univ.. of Southern California. If so, share your PPT presentation slides online with PowerShow.com. Viscoelasticity wikipedia. Elastic properties. The deformation modulus is Young’s modulus (E) for a rock mass (E rm) or a soil mass; it is the ratio of principal stress in one direction (σ x) to corresponding strain in the elastic range in the same direction (ε x).It is not easily measured, so estimation methods based on geophysical measurements or rock mass classification schemes tend to be used. It has been observed that even under short term loading concrete does not behave as an elastic material. Provided that the elastic limit is not exceeded, an elastic deformation (strain) (strain) is directly proportional . Seismology I - Elasticity Elasticity Theory A time-dependent perturbation of an elastic medium (e.g. 15. Materials Required. Elasticity Lecture # 2 Young's modulus It may be defined as the ratio between stress and strain within the elastic limit. Spring thread. Created: Apr 20, 2020 | Updated: May 14, 2020 This is a 7 slide PowerPoint that covers BTec National Engineering (A-Level equivalent) on the topic of Tensile and Compressive forces which create stress and strain. 1868 0 obj
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In most metals G is about 0.4 E ; if the value of one modulus is known, the other may be approximated. Ppt. L L 7 -4 6.37 x 10 Pa 3.08 x 10 Stress Modulus Strain Modulus = 207 x 109 Pa This longitudinal modulus of elasticity is called Young’s Modulus and is denoted by the symbol Y. The modulus of elasticity (= Young’s modulus) E is a material property, that describes its stiffness and is therefore one of the most important properties of solid materials. Youngs modulus (E) slope of stress-strain curve with sample in tension (aka Elastic modulus). K m no. Alternatively, elastic constants K (bulk modulus) and/or G (shear modulus) can also be used. (c) Representative force, P, versus change in displacement, Δx, experimental result for a typical buckling experiment.The red dashed lines show the tangent intersection approach used to determine the critical buckling load, P cr. Basic Elasticity and viscoelasticity In the physically stressful environment there are three ways in which a material can respond to external forces. And so some key takeaways from the lecture, the modulus of elasticity and this class will be the notation for it will be a capital E. The slope of the linear elastic region of the stress-strain curve is the modulus of elasticity. 1851 0 obj
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Benjie Cho and Mulugojam Alemu. Young’s modulus 1. From equation 2, we can say that Modulus of Elasticity is the ratio of Stress and Strain. A schematic representation of (a) an unbuckled and (b) a buckled film with the key dimensions illustrated. The PPT gives insight into the fundamentals of elastic properties materials. 26 Each resin composite was inserted in a mould and light-cured at 850 mW/cm 2 (Optilux 501 Curing Light, Kerr Corporation, Orange, CA, USA) for 20 s per site at 5 overlapping sites, from both the top and bottom surfaces. However upto about 10 to 15% of the ultimate strength of concrete, the stress-strain curve is not much curved and more accurate values of modulus of elasticity may be obtained. %PDF-1.5
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State Key Laboratory of Polymer Physics and … a rupture, an earthquake, a meteorite impact, a nuclear explosion etc.) Preview. Home. 1 general theory of elastic wave scattering. Presentation Summary : Find values for the Young’s Modulus and Poisson’s ratio from the data. 1. The slope of the linear portion of the curve describes the modulus of ; the specimen. Modulus of Elasticity and Poisson Ratio of Concrete - Modulus of Elasticity and Poisson Ratio of Concrete. Introducing nonlinear elastic materials | comsol blog. Mechanical deformation puts energy into a material. Young's modulus, also known as the tensile modulus, is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. 12 ELASTICITY ADVERTISEMENT. The modulus of elasticity so obtained from actual loading is called static modulus of elasticity. For example, GLR is the modulus According to my limited knowledge from working on a long-span bridge project, modulus of elasticity of soil changes with depth (let say per one metre depth), either for cohesive or non-cohesive soil. This can be repeated many times with no apparent degradation to the rubber. Elastic. The value of modulus of elasticity of wet specimen is found higher from 3 to 4 GPa (3.2 to 4.3 x 10 4 kg/cm 2) than dry specimen i.e., the modulus of elasticity of wet concrete is higher by 16.3% to 7.5 according to its compressive strength. however, up to about 10-15 % of the ultimate strength of concrete , the stress strain graphs is not very much curved and hence can give more accurate value. Modulus of elasticity. Ppt. Elasticity modulus as function of compressive strength—experimental results and empirical law prediction. a) Young’s Modulus(Y) or modulus corresponding to longitudinal strain b) Bulk modulus(K) or modulus corresponding to the volume strain c) Rigidity modulus(N) or modulus … Shear modulus (G) - slope of stress-strain curve with sample in torsion or linear shear. Therefore, M= Stress/strain There are 3 types of elastic constants:- 1) Young’s Modulus (Y) 2) Bulk Modulus (K) 3) Modulus of Rigidity(η) See our User Agreement and Privacy Policy. Modulus of elasticity is the prime feature in the calculation of the deformation response of concrete when stress is applied. • For granites and limestone the modulus of elasticity in compression is in the range 2,000,000 – 7,000,000 psi. The present study evaluated the variations of elastic modulus of muscle and tendon using SWUE when different technical aspects were altered. 4. Modulus of elasticity (10 6 psi) Modulus of elasticity (GPa) 0 20406080 100 Tungsten concentration (vol%) 350 300 250 200 150 Upper bound Lower bound Figure 16.3 Modulus of elasticity versus volume percent tungsten for a composite of tungsten particles dispersed within a copper matrix. These two quantities are related by the following equation that defines the modulus of elasticity: stress = modulus x strain Aug 18, 2016. Theory of the elastic properties of rubber: the journal of chemical. Elasticity (and other useful things to know). Now customize the name of a clipboard to store your clips. The load on the composite is equal to the sum of the loads on the fiber layers and the matrix layers or FC = FF + FM. Quantum mechanics for Engineering Students, No public clipboards found for this slide. Modulus of elasticity (Young modulus) is a number that describes the ratio of stress to strain in an object that is being deformed by a force that is perpendicular to a surface of an object. Y = Longitudinal stress / Linear Strain, If a weight suspended to an elastic wire then, F = mg, A = πr2 for cross section area of cylindrical wire. Modulus of elasticity. Steel is much stiffer than rubber. The Modulus of the elasticity is the ratio of stress to corresponding strain below the proportional limit. Elastic properties. With modulus of elasticity, it can really be thought of as a non-geometric stiffness, and it is the slope of the stress-strain curve. After preparing the ends and installing a compressometer, a series of compressive stress cycles up to approximately 40 percent of the measured compressive strength will be applied. ... Ep = = Use the modulus sign ([xx]) to remove the (–ve) sign if the answer is (-ve) •We know from the Law of Demand that price … Binyang Du, Ophelia K. C. Tsui, Qingling Zhang, and ; Tianbai He; View Author Information. it is seen that even under short term loading concrete does not behave as an elastic material . This can be repeated many times with no apparent degradation to the rubber. With the compressive strength test on the concrete specimen (cylinder of 15 cm diameter and 30 cm length having a volume 15 cm cube), the modulus of elasticity of concrete is calculated with the help of stress and strain graph. 2 1 1 2 2(1) o dd n fR E f p ur =+ where E d = dynamic modulus of elasticity, Pa, ? The PowerPoint PPT presentation: "Modulus of Elasticity and Poisson Ratio of Concrete" is the property of its rightful owner. Mechanical Properties of Optical Fibers 541 For the photosensitive optical fiber without the coating the average value obtained for the EG×A product was 841.30±15.06 N and the aver age rupture limit was 7.57±2.51 N. Considering the area of each optical fiber ty pe, the Young modulus can be obtained through Reference: Elasticity Theory Applications and Numerics, M.H. The amorphous Al 2 O 3 was in the form of a shell, wrapped around GaAs nanowires, thereby forming an effective core/shell structure. Standardization on Shear wave ultrasound elastography (SWUE) technical settings will not only ensure that the results are accurate, but also detect any differences over time that may be attributed to true physiological changes. Open in figure viewer PowerPoint. The bulk modulus of elasticity of … h�bbd``b`� ��@�i������w �$�� $�ׁXw@�.��>1$�
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