Chapter 1 General concepts of stress and strain • The end of the chapter‚ the students should be able to: – Find internal forces of a body – Calculate the average normal stress and average shear stress of a body subject to axial forces and shear forces respectively – Calculate the normal strain from a body`s deformation – Understand and be able to apply the relationship between stress and strain. – Locate and identify material characteristics associated with a tensile test stress-strain diagram
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3.4 Thermal Effect Shear strain In general‚ increase in temperature causes the atoms to vibrate more and makes average atomic spacing greater. Macroscopically‚ this will lead to dimension increase in solid: T + T +V T – T – V In an isotropic material‚ temperature change only introduces variation of direct (normal) strain. In other words‚ thermal deformation does not cause shear strain. where T0 is a reference temperature and = coefficient of thermal expansion (C)-1 Hooke’s
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MEC411 Faculty of Mechanical Engineering Engineering Mechanics Centre of Studies V{tÑàxÜ E Axial Loading Materials for this chapter are taken from : 1. 2. Ferdinand P. Beer‚ E. Russell Johnston‚Jr‚ John T. Dewolf‚ David F. Mazurek “ Mechanics of Materials” 5th Edition in SI units R.C.Hibbeler “ Mechanics of Materials “ Seventh Edition Ch 2 - 1 MEC411 Faculty of Mechanical Engineering Engineering Mechanics Centre of Studies Introduction Suitability of a structure or machine
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Biaxial stress & strain Poisson’s ratio σx = E1-v2 (εx + vεy) εx = 1E (σx - vσy) Uniaxial: v = - εyεx σy = E1-v2 (εy + vεx) εy = 1E (σy - vσx) Biaxial: v = E2G - 1 εz = - vE (σx + σy) Triaxial stress & strain
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What would you do if one country’s dominance over your country changed your life for the worse? This is what was occurring to the lithuanians. During Stalin’s rule‚ There were many things he did to ensure soviet dominance. Stalin had a five year plan. This five year plan was to gain complete soviet dominance through the secret deportation of Lithuanians to siberia. The lithuanians faced many hardships not only in Siberia but on the way there as well. The first part of the plan was to deport them
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Male Dominance It seems that in the past‚ men have been portrayed as being more dominant then women. This is seen in everything from movies‚ television shows‚ and in all forms of Literature. Men always appear to have the more prevailing role in the relationship. This can be seen in the short story “Yellow Wallpaper” and in the play A Doll House. In both of these pieces of Literature‚ the husbands both use their sense of male dominancy to feel that they are in control of their wives. In Gilman’s
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The Influence of Hand Dominance on Neuromuscular Reaction Time Abstract Neuromuscular reaction time may be influenced by hand dominance. This study examined whether hand dominance could influence the measurements of neuromuscular response by catching a meter stick in free-fall. A total of 9 subjects were examined with respect to hand dominance. The mean of the neuromuscular reaction time of the dominant and non-dominant hand was 268 mm and 314 mm‚ respectfully. The neuromuscular reaction time of
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Health Data Management Across the Continuum – Robert H. Dolan‚ L. A. (2011). Approaching semantic interoperability in Health Level Seven. Journal of American Medical Informatics Association‚ 18:99-103. The author begins this article looking at different definitions of the term semantic interoperability. As a general definition‚ the state of semantic interoperability allows two or more computer systems to exchage information and have the same interpretation of that data so results
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Discuss the significant factors for European dominance and wealth during the seventeenth century ‚and the contribution of African labour to their profitability and success of the plantation economies in the new world 1492 was Europe’s first interaction with the Caribbean the voyage was lead by Christopher Columbus who travel to the Caribbean three time thinking that he reached Indian he never realised his mistake this is why the Caribbean is called the West Indies ‚ he was inspired by Genoese
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Red is known to represent aggression and dominance in sports such as wrestling‚ Tae Kwon Do and boxing. When wearing red‚ it makes it easier to visualise the anger needed to compete in these sports. When wearing blue the other opponent will seem more intimidating subconsciously because red is a stronger colour on the mind. Referees are also known to give more points to the red opponent whilst competing‚ the colour affected the judge’s perspective on the athlete’s performance as red is such an aggressive
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