The full theory of elasticity is too complicated for routine design work. To simplify it, B-E beam theory makes six assumptions which are approximately true for most beams: The beam is long and slender. length >> width length >> depth therefore tensile/compressive stresses perpendicular to the beam are much smaller than tensile/compressive stresses parallel to the beam. The beam cross-section is constant along its axis. The beam is loaded in its plane of symmet ...

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Euler-Bernoulli beam equation, Euler-Bernoulli beam equation - History, Euler-Bernoulli beam equation - Assumptions, Euler-Bernoulli beam equation - Predictions, Euler-Bernoulli beam equation - Definitions, Euler-Bernoulli beam equation - Final equations, Euler-Bernoulli beam equation - Derivation, Euler-Bernoulli beam equation - Practical simplifications, Euler-Bernoulli beam equation - Extensions

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Euler-Bernoulli beam equation, Euler-Bernoulli beam equation - History, Euler-Bernoulli beam equation - Assumptions, Euler-Bernoulli beam equation - Predictions, Euler-Bernoulli beam equation - Definitions, Euler-Bernoulli beam equation - Final equations, Euler-Bernoulli beam equation - Derivation, Euler-Bernoulli beam equation - Practical simplifications, Euler-Bernoulli beam equation - Extensions

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The prevailing consensus is that Galileo Galilei made the first attempts at developing a theory of beams, but recent studies argue that Leonardo da Vinci was the first to make the crucial observations. Da Vinci lacked Hooke's law and calculus to complete the theory, whereas Galileo was held back by an incorrect assumption he made. (Ref. Ballarini) Leonhard Euler and Daniel Bernoulli were the first to put together a useful theory circa 1750. At the time, science and industrial art were generally seen as very distinct fields, and there ...

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Euler-Bernoulli beam equation, Euler-Bernoulli beam equation - History, Euler-Bernoulli beam equation - Assumptions, Euler-Bernoulli beam equation - Predictions, Euler-Bernoulli beam equation - Definitions, Euler-Bernoulli beam equation - Final equations, Euler-Bernoulli beam equation - Derivation, Euler-Bernoulli beam equation - Practical simplifications, Euler-Bernoulli beam equation - Extensions

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Daniel Bernoulli (Groningen, February 9, 1700 – Basel, March 17, 1782) was a Dutch-born mathematician who spent much of his life in Basel, Switzerland. He worked with Leonhard Euler on the equations bearing their names. Bernoulli's principle is of critical use in aerodynamics. It is applicable to steady, inviscid, incompressible flow, along a streamline. Born as the son of Johann Bernoulli,nephew of Jakob Bernoulli, younger brother of Nicolaus Bernoulli II,and older brother of Johann II, Daniel Bernoulli was by far the ablest ...

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Euler-Bernoulli beam equation - Definitions. x = location along the beam axis y = location perpendicular to beam and to loading z = location perpendicluar to beam, in load plane, with the axis origin at the centroid of the area of the cross-section ux = deflection along beam axis uSee also:

Euler-Bernoulli beam equation, Euler-Bernoulli beam equation - History, Euler-Bernoulli beam equation - Assumptions, Euler-Bernoulli beam equation - Predictions, Euler-Bernoulli beam equation - Definitions, Euler-Bernoulli beam equation - Final equations, Euler-Bernoulli beam equation - Derivation, Euler-Bernoulli beam equation - Practical simplifications, Euler-Bernoulli beam equation - Extensions

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A beam is a structural element that carries load primarily in bending (flexure). Beams generally carry vertical gravitational forces but can also be used to carry horizontal loads (i.e. loads due to a gust of wind or an earthquake). The loads carried by a beam are transferred to columns, walls or girders, which in turn transfer the force to adjacent structural members. Beams are characterized by their profile (the shape of their cross-section), their length, and their material. In contemporary construction, beams are typically ...

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In engineering mechanics, bending (also known as flexure) characterizes the behavior of a structural element subjected to a lateral load. A structural element subjected to bending is known as a beam. A closet rod sagging under the weight of clothes on clothes hangers is an example of a beam experiencing bending. Bending produces reactive forces inside a beam as the beam attempts to accommodate the flexural load: in the case of the beam in Figure 1, the material at the top of the beam is being compressed while the materia ...

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• Bending - Stress in a beam

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In engineering, buckling is a failure mode of a structural member characterised by a failure to react to the bending moment generated by a compressive load. Buckling - Buckling in columns. The ratio of the length of a column to the least radius of gyration of its cross section is called the slenderness ratio (usually expressed with the Greek letter lambda - λ). This ratio affords a means of classifying columns. All the following are approximate values used for convenience. A short steel ...

Including:

• Buckling - Buckling in columns
• Buckling - Buckling of surface materials
• Buckling - Local Buckling
• Buckling - Lateral-Torsional Buckling
• Buckling - Plastic Buckling

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In physics, spacetime is a model that combines space and time into a single construct called the space-time continuum. In our universe, this continuum has three dimensions of space and one dimension of time. Treating space and time on the same footing and as two aspects of a unified whole was devised by Hermann Minkowski shortly after the theory of special relativity was developed by Albert Einstein. This unification is further exemplified by the common practice of expressing time in the same units as space by multiplyin ...

Including:

• Spacetime - Basic concepts
• Spacetime - Spacetime intervals
• Spacetime - Mathematics of space-times
• Spacetime - Space-time topology
• Spacetime - Space-time continua and symmetry
• Spacetime - Spacetime in special relativity
• Spacetime - Spacetime in general relativity
• Spacetime - Is space-time quantized?
• Spacetime - Other uses of the word 'spacetime'
• Spacetime - History of the concept of space-time

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Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any wavelength. The three basic dimensions of light (i.e., all electromagnetic radiation) are: Intensity (or brilliance or amplitude), which is related to the human perception of brightness of the light, Frequency (or wavelength), perceived by humans as the color of the light, and Polarization (or angle of vibration), which is not perceptible by ...

Including:

• Light - Visible electromagnetic radiation
• Light - Speed of light
• Light - Refraction
• Light - Optics
• Light - Color and wavelengths
• Light - Measurement of light
• Light - Light sources
• Light - Theories about light
• Light - Early Greek ideas
• Light - 10th century optical theory
• Light - The 'plenum'
• Light - Particle theory
• Light - Wave theory
• Light - Electromagnetic theory
• Light - Particle theory revisited
• Light - Quantum theory
• Light - Wave-particle duality
• Light - A light wave

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Euler, with Daniel Bernoulli, established the law that the torque on a thin elastic beam is proportional to a measure of the elasticity of the material and the second moment of area of a cross section, about an axis through the center of mass and perpendicular to the plane of the moment, see Euler-Bernoulli beam equation. He also deduced the Euler equations, a set of laws of motion in fluid dynamics, directly from Newton's laws of motion. These equations are formally identical to the Navier-Stokes equations with zero viscosity. They are interesting ch ...

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Leonhard Euler, Leonhard Euler - Biography, Leonhard Euler - Discoveries, Leonhard Euler - Honours, Leonhard Euler - Quotes

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Beam bending is analyzed with the Euler-Bernoulli beam equation. The classic formula for determining the bending stress in a member is: σ is the bending stress M - the moment at the neutral axis y - the perpendicular distance to the neutral axis Ix - the second moment of inertia about the neutral axis x This equation is valid only when the stress at the extreme fiber (i.e. the portion of the beam furthest from th ...

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Bending, Bending - Stress in a beam

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Leonhard Euler was born near Basel, Switzerland, the son of Paul Euler, a Lutheran minister. Although in his childhood he exhibited great mathematical talents, his father wanted him to study theology and become a minister. In 1720 Euler began his studies at the University of Basel. There Euler met Daniel and Nikolaus Bernoulli, who noticed Euler's skills in mathematics. Paul Euler had attended Jakob Bernoulli's mathematical lectures and respected his family. When Daniel and Nikolaus Bernoulli asked him to allow his son to study mathematics he finally ...

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Leonhard Euler, Leonhard Euler - Biography, Leonhard Euler - Discoveries, Leonhard Euler - Honours, Leonhard Euler - Quotes

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Finite element method models a structure as an assembly of elements or components with various forms of connection between them. Thus, a continuous system such as a plate or shell is modeled as a discrete system with a finite number of elements interconnected at finite number of nodes. The behaviour of individual elements is characterised by the element's stiffness or flexibility relation, which altogether leads to the system's stiffness or flexibility relation. To establish the element's stiffness or flexibility relation, we can use the ...

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Structural analysis, Structural analysis - Mechanics of materials methods, Structural analysis - Elasticity methods, Structural analysis - Finite element methods, Structural analysis - Time-line

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The ratio of the length of a column to the least radius of gyration of its cross section is called the slenderness ratio (usually expressed with the Greek letter lambda - λ). This ratio affords a means of classifying columns. All the following are approximate values used for convenience. A short steel column is one whose slenderness ratio does not exceed 50; an intermediate length steel column has a slenderness ratio ranging from 50 to 200, while long steel columns may be assumed as one having a slenderness ratio greater ...

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Buckling, Buckling - Buckling in columns, Buckling - Buckling of surface materials, Buckling - Local Buckling, Buckling - Lateral-Torsional Buckling, Buckling - Plastic Buckling

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Elasticity methods are available for individual members such as beams, columns, shafts, and for entire structures such as plates and shells. The solutions are derived from linear elasticity equations. Many of the developments in the mechanics of materials and elasticity approaches have been expounded or initiated by Stephen Timoshenko. ...

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Structural analysis, Structural analysis - Mechanics of materials methods, Structural analysis - Elasticity methods, Structural analysis - Finite element methods, Structural analysis - Time-line

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Buckling is also a failure mode in pavement materials, primarily with concrete since asphalt is more flexible. Radiant heat from the Sun is absorbed in the road surface, causing it to expand and forcing adjacent pieces to push against each other. If the stress is great enough, the pavement can lift up and crack without warning. Going over a buckled section can be very jarring to automobile drivers, described as running over a speed bump at highway speeds. Similarly, railroad tracks also expand when heated, and can fail by buckling. It is more common for rails to move laterally, of ...

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Buckling, Buckling - Buckling in columns, Buckling - Buckling of surface materials, Buckling - Local Buckling, Buckling - Lateral-Torsional Buckling, Buckling - Plastic Buckling

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These are available for structural members subject to specific loadings such as axially loaded bars, prismatic beams in a state of pure bending, and circular shafts subject to torsion. The solutions can be superimposed using the superposition principle to analyze a member undergoing combined loading. Solutions for special cases exist for common structures such as thin-walled pressure vessels. For the analysis of entire systems, this approach can be used in conjunction with statics, giving rise to the method of sections and m ...

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Structural analysis, Structural analysis - Mechanics of materials methods, Structural analysis - Elasticity methods, Structural analysis - Finite element methods, Structural analysis - Time-line

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Given two points A and B, with A not lower than B, there is just one upside down cycloid that passes through A with infinite slope and also passes through B. This is the brachistochrone curve. The brachistochrone thus does not depend on the body's mass or on the strength of the gravitational constant. The problem can be solved with the tools from the calculus of variations. Note that if the body is given an initial velocity at A, or if friction is taken into account, the curve that minimizes time will differ from the one ...

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Brachistochrone curve, Brachistochrone curve - The brachistochrone is the cycloid, Brachistochrone curve - Proof, Brachistochrone curve - History, Brachistochrone curve - Etymology

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All light propagates at a finite speed. Even moving observers always measure the same value of c, the speed of light in vacuum, as c = 299,792,458 metres per second (186,282.397 miles per second). When light passes through a transparent substance, such as air, water or glass, its speed is reduced, and it undergoes refraction. The reduction of the speed of light in a denser material can be indicated by the refractive index, n, which is defined a ...

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Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave

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