What i want to know is the problems that can occur during a standard classroom experiment that could effect the. Activityforces, elasticity, stress, strain and youngs modulus handout 2 elasticity and youngs modulus elasticity describes a material property in which the material returns to its original shape after stress has been applied and then removed. Mechanical deformation puts energy into a material. Physics 3 summer 1989 lab 7 elasticity theory all materials deform to some extent when subjected to a stress a force per unit area. Youngs modulus can be calculated using the equation 3 simulator procedure as performed through the online. Calculate the value of youngs modulus of copper bar by nonuniform bending. If the deformation, or strain the ratio of the change in length to the initial length, is. Youngs modulus can be calculated using the equation 3 simulator procedure as performed through the online labs select the environment from the drop down list. In the process, you will gain an understanding of the concepts of stress and strain. Experimental measurement of youngs modulus from a single crystalline cementite bonwoong koo,a,1 young jin chang,a,1 seung pyo hong,a chan soon kang,b shin woong jeong,c wonjong nam,c iljeong park,d youngkook lee,d. Pdf youngs modulus, fracture strength, and poissons ratio. Equipment youngs modulus apparatus weights 4 2kg, 2 1kg, and 1kg of smaller weights micrometer laboratory. The same procedure is repeated for unloading the weights in steps of half kg.
It defines the relationship between stress force per unit area and strain proportional deformation in a material in the linear elasticity regime of a uniaxial deformation. Calculate the value of young s modulus of copper bar by nonuniform bending. Strength of materials lab manual pdf sm lab manual pdf file please download the strength of materi. Hookes law in terms of stress and strain is stress strain in terms of the definitions l l y a f the constant of proportionality is called the elastic modulus or youngs modulus. Video of the experiment to determine the youngs modulus of a metal wire using a travelling microscope. Youngs modulus, fracture strength, and poissons ratio of nanocrystalline diamond films. Anna university lab young modulus nonuniform bending physics lab video prepared by. Determination of dynamic youngs modulus of concrete at early ages by impact resonance test. From these observations the extension, l for a load m can be determined. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. Define the following stress the force applied per crosssectional area of a material strain the extension in length resulting from stress brittle a material that breaks without plastic deformation elastic a material that returns to its original shape after.
Physicists call the pattern youngs fringes and refer to it as youngs experiment, after the man who devised it. Experimental measurement of youngs modulus from a single. Now, try to imagine this apparatus in front of you as it. An apparatus to measure youngs modulus high point, nc. An apparatus to measure youngs modulus michael cantor and martin dewitt, department of chemistry and physics, high point university, high point, nc abstract youngs modulus, a measure of the deformation of a material in response to an applied force, is an integral variable to consider when designing and engineering systems such as buildings. In this lesson, learn how to calculate youngs modulus and what it can tell you about the material. The relations from which young s modulus may be computed from mechanical flexural and longitudinal resonance frequencies have been established by an empirical method using two sets of steel bars. The calculated values for the youngs modulus may be compared with the values in this properties table. In the observation window move the cross wire up and down to align it with the tip of the needle and click on take reading.
When compared to the accepted value this represents a percent difference of 94. Youngs modulus differences between untreated cells and cells exposed to mwcnts and gfs. View notes youngs modulus report from language 100 at guangdong university of foreign studies. Youngs modulus of fishing wire abstract i have found out that there is a reduction in errors when there are accurate ways of measuring used such as using a micrometre instead of vernier caliphers and using a wire with a smaller diameter means we can be more accurate with measuring the youngs. When thinking about elasticity, think about a coiled metal spring or a rubber band. Stiffness in tension youngs modulus 9 specimenshape. Youngs modulus also, known as modulus of elasticity, it is the ratio of longitudinal stress to that of longitudinal strain. Dec 15, 2017 try the data analysis yourself, download a free works.
An elastic modulus youngs modulus that characterizes the resistance of rubber composites to being deformed elastically i. What i want to know is the problems that can occur during a standard classroom experiment that could effect the results and the calculation of the young modulus. By hanging several different weights on the ends of the strips, and measuring the corresponding deflections, a graph can be can be plotted which allows the youngs modulus to be calculated. Users may need to adapt the risk assessment information to local circumstances.
Try the data analysis yourself, download a free works. Core practical 5technician sheet determine the young modulus of a material practical activities have been safety checked but not trialled by cleapss. This curve was found by experiment utilizing unloading and. At as, its a wellknown experiment to measure the young modulus of a material like copper which is quite stretchy k small, in other words. To determine the youngs modulus of the material of a wire. Forces, elasticity, stress, strain and youngs modulus.
We used the concept of hookes law, which states that in a certain range, the strain or deformation of a material is proportional to the stress applied to it. Youngs modulus of fishing wire abstract i have found out that there is a reduction in errors when there are accurate ways of measuring used such as using a micrometre instead of vernier caliphers and using a wire with a smaller diameter means we can be more accurate with measuring the youngs modulus of a fishing wire. Modulus of elasticity the modulus of elasticity youngs modulus e is a material property, that describes its stiffness and is therefore one of the most important properties of solid materials. Ive actually done an experiment before where we measured the youngs modulus, we made two marks on the wire and measured the change in length between these points, of course it probably also stretched outside of these points which is a fairly significant error.
What is not so well known is that all these youngs were actually the same man and he is also the young of youngs. Youngs modulus experiment appliedstatics eme1016 mmu. Determine the young modulus of a material objective. Both sets contained rectangular and cylindrical specimens. This file contains additional information such as exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. Determine the young modulus of a material objective safety. To determine youngs modulus of elasticity of the material of. View notes young s modulus report from language 100 at guangdong university of foreign studies. Lab 3 ball and spring model of materials 9292009 today you will explore the ball and spring model of solids, both through experimental measurements of youngs modulus and through modeling of the speed of sound in a material. Youngs modulus, or the young modulus, is a mechanical property that measures the stiffness of a solid material. To determine the young s modulus of the material of a wire.
Tensile modulus youngs modulus or modulus of elasticity is a measure of stiffness of an elastic material. As the shown in figure 1 the sample was never taken past the elastic region. To determine youngs modulus of elasticity of the material of a given wire aim to determine youngs modulus of elasticity of the material of a given wire. Nov 25, 2016 to determine youngs modulus of elasticity of the material of a given wire aim to determine youngs modulus of elasticity of the material of a given wire. Pdf determination of dynamic youngs modulus of concrete at. General objective to evaluate the elastic behavior of the given wooden beam by pin and microscope experimental method and to find its youngs modulus specific objectives 1. Young s modulus, or the young modulus, is a mechanical property that measures the stiffness of a solid material. That character is usually used as the mascot for the cincinnati reds baseball team. Youngs modules objective to study the stress and strain of the material, to study the. The value for the young modulus i got was far off from the true value, but i think this was expected. For 20 gauge copper wire the following experimental results produced a young s modulus constant of 6063 mpa, or 6.
Elasticity of materials and youngs modulus description in this lab you will measure the youngs modulus of a metal wire. Evaluation of the elastic youngs modulus and cytotoxicity. Define the following strain stress brittle elastic 3. Activity youngs modulus practice problems answer key youngs modulus practice problems answer key 1. A patients leg was put into traction, stretching the femur from a length of 0. When thinking about elasticity, think about a coiled.
Elastic materials have internal forces which restore the size and shape of the object when the stress is removed. For 20 gauge copper wire the following experimental results produced a youngs modulus constant of 6063 mpa, or 6. Youngs modulus, fracture stress, and poissons ratio are important. A comparison of experimental and theoretical relations. Select the material of the beam from the dropdown menu. Im doing an experiment write up for the young modulus. Teaching as physics practical skills finding the young modulus of a wire student worksheetin this experiment you will take measurements to determine the young modulus of a wire. To find the youngs modulus of the given material of the beam by uniform bending. This was our first lab, and the goal was to determine youngs modulus of elasticity of a thin wire by stretching. Mechanical properties of materials david roylance 2008. Strength of materials lab manual pdf sm lab manual pdf.
The elastic youngs modulus of fibroblast cells after exposure to gfs significantly decreases by 20% than the control cells, whereas cells exposed to mwcnts decreased 10%. To measure the thickness and breadth of the given wooden beam using screw gauge. The forcevolume measurements were done at least 22 points per cell. Experiment 3 modulus of elasticity related topics youngs modulus, modulus of elasticity, stress, deformation, poissons ratio, hookes law.
It is bent by the action a force acting at its centre. Youngs modulus is a material property that tells you how stiff or stretchy a material is. Relevant to the young s modulus experiment are the use of appropriate analogue apparatus, use of methods to increase accuracy and the use of calipers and micrometers so the gravity, interference and electrical properties podcasts are contain discussions about relevant curriculum points. So all these things are associated with people by the name of young. Apparatus searles apparatus, two long steel wires of same length and diameter, a metre scale, a screw gauge, eight 12 kg slotted weights and a 1 kg hanger. The modulus of elasticity is determined from the bending and the geometric data of the. Modulus of elasticity or youngs modulus and tensile. Hookes law holds up to a maximum stress called the proportional limit.