The Pole Vault Pole. By Matt Shuler ECIV 303: Fall 2010. Pole Vaulting. Pole Vaulting: An event in track and field in which an athlete known as a “vaulter” uses a pole to propel them over a cross bar.
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ECIV 303: Fall 2010
Men: 6.15m (20’2”) Women: 5.06m (16’8”)
Ekevadand Lundberg J Biomech, 30, 259 (1997)
An extremely strong, thin fiber, consisting of long, chainlike molecules of pure carbon that are made by charring synthetic fibers such as rayon in the absence of oxygen.
Carbon Fiber- Tensile Strength: 5,650 MPad Density: 1.75 g/cm^3
4x Rigidity of Fiberglass
2/3 Compressive Strength of Fiberglass but depends on how alignment of material
Cost more than fiberglass
Jeff Watry: Pole Vault And The Pole
Choose Mandrel Size
Hollow steel tube-sized for the length and inner diameter of the pole
1st Layer of Material
Mandrel is rapped cress-cross style in both directions with chosen material : resin impregnated fiberglass or carbon fiber
Resin-hydrocarbon secretion: used for adhesive properties
1st Layer: Gives pole flexibility, durability, and fortifies pole circumference
Cut Fiberglass/Carbon Fiber Patterns are heat rolled onto the mandrel-resin helps it bond.
Sail Piece is added last
Controls how the pole bends
Bruce Caldwell-EssX Poles
Mandrel and Fiberglass are put into a oven
Stage 1: Steam is used to heat the oven to 175° F
This liquefies the resin so that it resaturates the fiberglass
Stage 2: Oven gradually rises to 300 ° F
This solidifies the resin-”curing” it
Curing-toughening or hardening
Bruce Caldwell-EssX Poles
Pole is then subject to a stress test
Stress Test- Tests pole for deformities and defects: pole will fail if any defects are present
Stress Test- Puts a permanent natural bend in the pole: poles are only meant to bend one way
Gives the pole a soft side and stiff side
Pole is given a “Flex Number”
Flex Number Test: Pole is supported 6” on both ends of the pole. A 50lb weight is then added to the mid point of the pole. The distance in cm that the pole deforms is the flex number.
Flex Number are used to help vaulter transition form one pole to the next.
Flex Numbers are used to only measure relative stuffiness, not the total load that the pole can support
Causes of Failure
When vaulter applies more force than the pole can withstand
When pole is overloaded: the pole will develop “bruises” or permanent deformations in the fibers-eventually leading to failure
Crack-caused by a strike to the pole-failure usually happens on the tension side of the pole