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Session 0464

Stretchy “Elastic” Bands

Alan K. Karplus Department of Mechanical Engineering Western New England College Springfield, MA 01119-2684

Key Words: Elastics, Tension Tests

Prerequisite Knowledge: Have an idea about changes in the load an elastic band holds as it is stretched and unloaded.

Objective: To work as a team member in the collection of data, to make plots for near constant rate loading and unloading of traditional rubber bands, and to show features which are unique to these elastic products.

Equipment: 1. A series of three and one half inch long rubber “elastic” bands of 1/8, 1/4 and 1/2 inch width which are often referred to as number 33, 64, and 84 rubber bands, respectively. Most office supply houses will stock a variety. 2. Yard Stick, or Tape measure or 30 inch long machinist’s measure. 3. Two, 2 inch size C - clamps. 4. Mounting board (2 in. by 1 in. by 30 inches) with a six penny nail inserted one inch from one end on the 2 inch by 30 inch face, and to which the machinist’s scale can be clamped. The zero of the machinist’s scale should be at the nail. 5. Vise to hold the mounting board. 6. Safety Goggles 7. Heavy work gloves 8. Load scale for loads to 50 pounds or 25 kg. A scale with a capacity to 10 pounds or 5 kg. may be helpful, if available. 9. Micrometer or vernier caliper. 10. Data page with 25 lines and nine columns. Measurements are taken at one inch increments starting at a value of four inches listed in the first column. The remaining columns are used in pairs to record load and unload for each of four elastic sizes. Be sure to label columns and include units of measure selected. 11. A Spreadsheet such as EXCEL™. All work performed on the spreadsheet can be done by hand. 12. When the computations are to be done by hand, computation paper and several pieces of linear graph paper with 20 divisions to the inch are needed.

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Karplus, A. K. (1998, June), Stretchy Elastic Bands Paper presented at 1998 Annual Conference, Seattle, Washington. 10.18260/1-2--7426