MER2 1 4 : Strength of Materials Strain Gage Preparation Department - - PowerPoint PPT Presentation

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MER2 1 4 : Strength of Materials Strain Gage Preparation Department - - PowerPoint PPT Presentation

Oct 22, 2023 192 likes •311 views

MER2 1 4 : Strength of Materials Strain Gage Preparation Department of Mechanical Engineering Union College Schenectady, NY Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering 1 Union College Schenectady, NY Strain Gage

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SLIDE 1

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 1

MER2 1 4 : Strength of Materials Strain Gage Preparation

Department of Mechanical Engineering Union College Schenectady, NY

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SLIDE 2

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 2

Strain Gage Preparation

  • Surface Preparation
  • Strain Gage Bonding
  • Lead Wire Attachment
  • Evaluation of Gage Performance
  • Specimen Evaluation
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SLIDE 3

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 3

Surface Preparation Avoid the Follow ing

  • Touching the surface with the fingers
  • Wiping back and forth or reusing swabs or

sponges

  • Dragging contaminants into the cleaned area

from the uncleaned boundary of that area

  • Allowing a cleaning solution to evaporate from

the surface

  • Allowing a partially prepared surface to sit

between steps in the preparation process or a prepared surface to sit before bonding

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SLIDE 4

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 4

Surface Preparation

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SLIDE 5

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 5

Surface Preparation

  • Solvent Degreasing

– Spray solvent onto specimen – Use gauze pad to wipe specime

  • Surface Abrading

– Place M-Prep Conditioner A on Specimen – Wet-lap surface – 320 grit SC paper

  • When surface is bright

– Wipe surface dry

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SLIDE 6

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 6

Layout Lines

  • The gage will be placed

near the center of the specimen

  • Using a scale and pencil,

scribe line along the length

  • f the specimen
  • Apply Conditioner A and

clean surface with cotton- tipped applacator

  • Apply Neutralizer to

surface and clean with gauze pad

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SLIDE 7

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 7

Strain Gage Bonding

  • Remove gage from

package, DO NOT Touch

  • Place gage on clean

surface (acetate envelope)

  • Pick gage up using

cellophane tape

  • Align gage on specimen
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SLIDE 8

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 8

Bonding Gage to Specim en

  • Peal gage off

specimen

  • Apply catalyst

sparingly on gage

  • Apply two drops of

adhesive to base of gage

  • Apply pressure for
  • ne minute.
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SLIDE 9

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 9

Solder Lead W ires to Gage

  • Take six feet of six

wire ribbon

  • Separate and strip

the six wires on both ends

  • Twist and tin all

wires

  • Drop a bead of solder
  • n gage terminals
  • Solder wires to

terminals

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SLIDE 10

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 1 0

Preparation Completion

  • Use masking tape

to stabilize lead wires

  • Check resistance
  • f gage to insure

proper installation

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SLIDE 11

Ronald B. Bucinell, Ph.D., P.E. Departm ent of Mechanical Engineering Union College Schenectady, NY 1 1

Strain Gage Recording