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Deflection of Beam. Pairat Tanpornprasert , Ph.D. Niphon Wansophark , Ph.D Mechanical Engineering Department Faculty of Engineering Chulalonkorn University. Introduction. A beam is defined as a structural member which cross-sectional dimensions are relatively smaller than its length - PowerPoint PPT Presentation
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Deflection of BeamDeflection of Beam
Pairat Tanpornprasert , Ph.D.Pairat Tanpornprasert , Ph.D.Niphon Wansophark Niphon Wansophark , Ph.D, Ph.D
Mechanical Engineering DepartmentMechanical Engineering DepartmentFaculty of EngineeringFaculty of Engineering
Chulalonkorn UniversityChulalonkorn University
IntroductionIntroduction
A beam is defined as a structural A beam is defined as a structural member which cross-sectional member which cross-sectional dimensions are relatively smaller dimensions are relatively smaller than its length than its length
A beam is subjected to loads A beam is subjected to loads perpendicular to its long dimensionperpendicular to its long dimension
Beam deflections are considered to Beam deflections are considered to be elastic deflectionsbe elastic deflections
Introduction (con’)Introduction (con’)
The design of beams is often based on deflection The design of beams is often based on deflection characteristics, rather than strengthcharacteristics, rather than strength
Beams are used in different kinds of construction Beams are used in different kinds of construction
- - Machine - Bridges - Airplanes - Automotives
- etc,- etc,
MotivationMotivation The deflection of machine parts must also The deflection of machine parts must also
be kept below certain tolerances to allow be kept below certain tolerances to allow the machine to function properly the machine to function properly - Difficulties in parts assembly and - Difficulties in parts assembly and installationinstallation- Unbalance in rotating shaft- Unbalance in rotating shaft
Large deflection cause or create unstable Large deflection cause or create unstable structurestructure- Floor collapse- Floor collapse- Bridge collapse- Bridge collapse
Motivation (con’)Motivation (con’)
Precision machine needs rigid Precision machine needs rigid structurestructure
- Machine tool- Machine tool
- Robotics- Robotics
- Measuring Instrument- Measuring Instrument Allowable deflection of beams are Allowable deflection of beams are
often limitedoften limited Stresses are also limitedStresses are also limited
Mississippi River BridgeMississippi River Bridge
collapscollapseded on August 1, 2007 on August 1, 2007