EPICS Learning Community
EPICS Learning Community ENGR 19500
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This 2 page Class Notes was uploaded by Mr. Theodora Marks on Saturday September 19, 2015. The Class Notes belongs to ENGR 19500 at Purdue University taught by Staff in Fall. Since its upload, it has received 18 views. For similar materials see /class/207845/engr-19500-purdue-university in Engineering and Tech at Purdue University.
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Date Created: 09/19/15
Define Force The action of one body acting upon another body Transmissibility A force can be moved along its line of action without altering the external effect Moment The tendency of a force to cause rotation about an axis Couple Forces that are parallel equal in magnitude and lie in the same plane Equilibrium Unchanging situation Stress effect of force due to applied load Proportional limit maximum stress for which stress is proportional to strain Yield strength the stress level that will leave a permanent damage to the material Ultimate strength The maximum stress that the material can withstand Modulus of elasticity E lk in hooke s law StressEstrain Design stress the amount of stress that an object is expected to handle preferably less than the yield strength of a material Safety factor The ratio of the yield strength to the design stress Identify Force Systems Collinear Forces acting along the same line of action Concurrent Forces that pass through the same point in space Coplanar Forces that lie in the same plane Concurrent coplanar forces that pass through the same point and lie in the same plane How do you write a force vector in two or three dimensions 2D ltxygt 3D ltxyzgt How do you combine forces into a resultant and resolve forces into components To combine add their components together To resolve multiply unit vectors by magnitudes You could also separate it into X and Y components How do you calculate the moment of a force and a couple Moment of a force r x F Moment of a couple F x d where dis the distance between the forces How do you construct a free body diagram of a rigid body at rest Isolate the desired object from its surroundings Replace items cut free with appropriate forces Add known forces including weight Establish a coordinate xy frame of reference Add geometric data How do you write and solve the equations of equilibrium for a rigid body at rest SumFx 0 SumFy 0 SumM0 Draw a free body diagram Write the equations of equilibrium Solve How do you determine the resultant of a noncoplanar concurrent force system Find unit vectors for the forces Write the force vectors as Cartesian vectors Write the resultant vector Find angles using formulas From the positive xyz axis cos x x mag cos y ymag cos 2 zmag How do you describe a stress strain diagram A graph of the results ofa tensile test How do you compute the size of a structural member given the limiting stress or limiting deformation Solve from Young s modulus modulus of elasticity and deflectionelongation E FA delta LL Deflection d F lAE
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