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ASTM F498-77(1998)

(Test Method)

Standard Test Method for Center Spring Constant and Spring Constant Balance of Alpine Skis

Standard Test Method for Center Spring Constant and Spring Constant Balance of Alpine Skis

SCOPE
1.1 This test method covers the determination of center spring constant, forebody spring constant, and afterbody spring constant of Alpine skis. In addition, it covers a method for determination of the spring constant balance.  
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Feb-1998
ICS
97.220.20 - Winter sports equipment
Technical Committee
F27 - Snow and Water Sports
Drafting Committee
F27.30 - Skiing and Snowboarding Equipment
Current Stage
Ref Project

Relations

Replaced By
ASTM F498-77(2006) - Standard Test Method for Center Spring Constant and Spring Constant Balance of Alpine Skis
Effective Date
01-Oct-2006
Referred By
ASTM F504-05(2022) - Standard Test Method for Measuring the Quasi-Static Release Moments of Alpine Ski Bindings
Effective Date
10-Feb-1998

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ASTM F498-77(1998) - Standard Test Method for Center Spring Constant and Spring Constant Balance of Alpine SkisASTM F498-77(1998) - Standard Test Method for Center Spring Constant and Spring Constant Balance of Alpine Skis
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ASTM F498-77(1998) - Standard Test Method for Center Spring Constant and Spring Constant Balance of Alpine Skis
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Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F498–77 (Reapproved 1998)
Standard Test Method for
Center Spring Constant and Spring Constant Balance of
Alpine Skis
This standard is issued under the fixed designation F 498; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.8 center spring constant—the load, in newtons, required
to deflect point M a distance of 1 cm.
1.1 This test method covers the determination of center
springconstant,forebodyspringconstant,andafterbodyspring F
M
C 5 (1)
M
constant of Alpine skis. In addition, it covers a method for f
m
determination of the spring constant balance.
2.9 afterbody spring constant—the load, in newtons, re-
1.2 This standard does not purport to address all of the
quired to deflect point A a distance of 1 cm.
safety concerns, if any, associated with its use. It is the
F
A
responsibility of the user of this standard to establish appro-
C 5 (2)
A
f
m
priate safety and health practices and determine the applica-
2.10 forebody spring constant—the load, in newtons, re-
bility of regulatory limitations prior to use.
quired to deflect point B a distance of 1 cm.
2. Definitions
F
B
C 5 (3)
B
2.1 spring constant—a measurement of the stiffness of a ski f
B
in bending, expressed as a ratio of force to deflection.
2.11 spring constant balance—the ratio of afterbody spring
2.2 ski size, x —the projected length with the ski body
pl
constant divided by forebody spring constant.
pressed flat against a plane surface, measured between the ski
C
A
tail and the ski tip, commonly referred to as chord length. The
B 5 (4)
C
B
developed or material length is the length from tip to tail along
the bottom contour of the ski.
3. Preparation of Apparatus
2.3 point A—the support point for the afterbody of the ski
3.1 Center Spring Constant Equipment—Equip supports A
when the center spring constant is measured or the load
and B with low-friction rolls of 2.0 6 0.1 cm diameter.Apply
application point when the afterbody spring constant is mea-
the load with a dynamometer or calibrate the measurement of
sured.
load with an accuracy of 6 0.5 N. Measure the deflection with
2.4 point B—the support point for the forebody of the ski
a suitable instrument with an accuracy of 6 0.005 cm. Apply
when the center spring constant is measured or the load
the load with a cylindrical contact ram having a radius of 1.0
application point when the forebody spring constant is mea-
6 0.1 cm and extending over the width of the ski.
sured.
3.2 Forebody and Afterbody Spring Constant Equipment—
2.5 point M—the load application point when the center
Provide a clamping fixture to grip the ski as a vise with a flat
spring constant is measured and the clamping point when the
rigidjawandthreeclampswithatleast15-cmspacingbetween
forebody spring constant or the afterbody spring constant is
them. Locate one clamp at each end and one in the center.
measured.Itislocatedatthemidpointbetweenpoints Aand B.
Clamps should be at least 3 cm wide covering the width of the
2.6 load F—the force applied normal to the support points
ski. Apply the load with a cylindrical contact ram having a
or the clamping plane, at points A, B, or M. The only
radius of 1.0 6 0.1
...

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