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Title: On the Skiability of Snow PDF
Url: http://www.meteconline.org/resources/On_the_Skiability_of_Snow.pdf
Creator: Brown, Christopher A.
Outwater, John O.
Publisher: University of Vermont
Description: Control during alpine skiing is achieved principally through the mechanical interaction between the ski and the snow. In that the nature of this interaction is basically a cutting or machining process, it is proposed that the complex physical and mechanical properties of the snow responsible for its skiability can be related to its machinability. A simple testing device is presented, which can machine the snow while keeping the ratio of thrust (vertical) to cutting (horizontal) forces equal to the tangent of the edge angle. The edge angle is varied to find a critical angle such that skidding occurs at large angles and holding at smaller angles. Using traditional machining theory, it is shown that this critical angle should be a function of the shear-strength-to-hardness ratio of the snow. A plot of critical angles versus shear-strength-to-hardness ratios is presented, which divides the surface into carving or holding and skidding regions. Critical angles have been measured between about 40 and 70 degrees. These angles correspond to shear-strength-to-hardness ratios between 0.24 and 3.84. The difficulty of relating this critical angle to some function of maximum skiable slope steepness is discussed relative to ski technique and forces on the ski. Related resource: "Modeling Edging Forces in Skiing Using Merchant's Theory for Metal Cutting" by C.A. Brown.
LC Classification: Geography. Anthropology. Recreation -- Recreation. Leisure -- Recreation. Leisure -- Sports -- Winter sports -- Skiing. Downhill skiing
Geography. Anthropology. Recreation -- Recreation. Leisure -- Recreation. Leisure -- Sports -- Winter sports -- Skiing. Downhill skiing -- Other special topics, A-Z -- Equipment and supplies
Science -- Physics -- Atomic physics. Constitution and properties of matter -- Special properties of matter and antimatter -- Friction, etc.
GEM Subject: Science -- Engineering
Science -- Physics
Vocational Education -- Trade and industrial
Key Concept: Physics -- Friction
Key Concepts Complete: Yes
Resource Type: Instructional Materials
Reading Materials
Reference
Science Materials
Teaching Guides
Format: pdf
Audience: College/University Instructors
Higher Education
Secondary Education
Students
Teachers
Technical School First Cycle
Technical School Second Cycle
University First Cycle
University Second Cycle
Vocational Training
Language: English
Access Rights: Free access
Date Of Record Release: 2010-02-18 03:00:01 (W3C-DTF)
Date Last Modified: 2011-08-22 13:10:48 (W3C-DTF)
Source Type: ATE Center
Source: National Center for Manufacturing Education
Full Record Views: 103
Resource URL Clicks: 11
Cumulative Rating: NOT YET RATED
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