Lab 2: Strain & Torsion Flashcards
Strain gages are widely used for measuring…
…strain, force, pressure, acceleration, and other important physical quantities
Some advantages over conventional mechanical gages include…
…the ability to measure rapidly changing parameters, small size and portability, high accuracy and precision, as well as remote sensing and recording.
However, strain gages can be difficult
to…
…install and can be expensive and often fragile.
What is the focus of this experiment?
Strain gauges installed on the surface of a loaded object can be used as a means for measuring surface strain.
By bonding (insulated) an electrical conductor to a specimen and observing changes of…
…electrical resistance as the specimen/conductor are strained, one has a means to measure strain.
Beam deflection and stress state depend upon…
…geometry, loading, and material type.
Objective #1
Learn how to install strain gages with the help of manufacturer instructions.
Objective #2
Measure strain on the surface of cantilever beams undergoing bending.
Objective #3
Estimate Young’s modulus for sandwich structure skins using measured surface strains and compare to reported values.
Objective #4
Observe the effect of geometry and material type on weight specific performance.
Objective #5
Gain appreciation for tradeoffs between weight savings, cost, and ease of fabrication.
Which aluminum allow will we be working with?
Aluminum alloy strip beam (alloy is 6061-T6511)
What does CFRP stand for?
(woven carbon fiber)
Torsion is important for designers of
Rotary machinery, automobiles, springs, and sensitive balances
The amount of twist depends upon
the applied…
…torque, member length, cross-section, and elastic moduli.
