Design and Application of a Mechanical Testing Apparatus to Determine the Static Coefficient of Friction Between Rubber Ladder Feet and Commercial Vinyl Tile
ProQuest, 2008 - 85 pages
The current ANSI A14.2 stepladder design verification slip test does not address the fact that the specified vinyl tile is liable to become obsolete while the standard is in effect. The slip test is based on the static coefficient of friction between the ladder feet and the specified vinyl tile. An apparatus and method was designed, fabricated and tested. It measured the static coefficient of friction in a laboratory setting and was found to be precise and accurate using ASTM D 6205 as a guide. Ladder manufacturers can use this apparatus and method to evaluate the friction of ladder feet without having to rely on one specific material to ultimately make ladders better and safer to use.
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Results and Discussion
ANOVA ANSI apparatus and method Application area of contact asperities ASTM G attached Blau Borco Board c-channel calibration procedure changed from static cleaned coefficient of friction Commercial Vinyl Tile deionized water design verification testing determine SCOF determine the static elastic elastic modulus Evaluation Expanded Region fiberboard force F force of friction friction coefficient friction force friction system Friction Testing hysteresis James Machine kinetic friction LabView program load cell LVDT transducer arm match mark material maximum load Mean SCOF measurements mechanical test apparatus movement MSerror normal force null hypothesis output pulling force Region for SCOF RK1 Test rubber feet rubber ladder feet SCOF graph Sensotech sheave and yolk signal conditioner sliding slip resistance Solarian specimen test platform standard deviation static coefficient static friction static to kinetic Stepladder Slip Test Test 9 test method test platform Fig test sled test surface tester Theory of Adhesion variances wear particles weight