ASTM F504-00
(Test Method)Standard Test Method for Measuring the Quasi-Static Release Moments of Alpine Ski Bindings
Standard Test Method for Measuring the Quasi-Static Release Moments of Alpine Ski Bindings
SCOPE
1.1 This test method covers a procedure for the measurement of release moments of ski bindings under conditions where inertia loadings of the ski binding system are not significant.
1.2 This standard does not purport to address all of the safety concerns, 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.
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Designation: F 504 – 00
Standard Test Method for
Measuring the Quasi-Static Release Moments of Alpine Ski
Bindings
This standard is issued under the fixed designation F 504; 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
1.1 This test method covers a procedure for the measure-
ment of release moments of ski bindings under conditions
where inertia loadings of the ski binding system are not
significant.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
F 498 Test Method for Center Spring Constant and Spring
Constant Balance of Alpine Skis
FIG. 1 Load Application
F 779 Test Method for Torsion Characteristics of Alpine
Skis
F 944 Specification for Properties of Adult Alpine Ski
The fourth point, located 356 0.5 cm in front of the center line
Boots
of the test shaft, shall be designated the “near preload point,”
2.2 ISO Standard:
NP. The fifth point, located 75 6 0.5 cm behind the centerline
ISO 9838
of the test shaft shall be designated the “far rear point,” FRP.
ISO 9462
The sixth point, the “alternate near preload point,” ANP, is
ISO 9465
located 7.5 6 0.25 cm, in the minus y-direction from the point
NP. For sole lengths longer than 300 mm the F and FR points
3. Terminology
are not changed from the location used for the 300 mm boot
3.1 The following terminology is introduced with reference
sole. For sole lengths shorter than 300 mm the N, R, ANP and
to the sketch of the boot-ski system shown in Fig. 1.
NP points are not changed from the location used for the 300
3.1.1 Six points of load application to the standard test ski
mm sole. For bindings which are to be used exclusively with
are required. With the adult boot sole (300 mm in length) the
skis shorter than the test ski, F and FR tests shall be performed
most forward point, located at a position 90 6 0.5 cm from the
at the N and R points. If the ski is too short for the specified N
centerline of the test shaft, shall be called the “forward point”
and R points, N and R shall be moved closer to the z axis by
and shall be designated as F. The second point, 45 6 0.5 cm in
10 cm each, and all tests performed using the new N and R
front of the centerline of the test shaft, shall be designated the
points. The forces that are applied to the standard ski at these
“near point,” N. The third point, located 456 0.5 cm behind the
six designated points may now be described by simple vector
centerline of the test shaft, shall be designated “rear point,” R.
notation. A laboratory-fixed axis designation shall be used with
the numeral z denoting the vertical axis normal to the top face
of the ski (in the region of the test shaft) and positive in the
This test method is under the jurisdiction of ASTM Committee F27 on Snow
direction outward from the ski; the numeral x denoting the
Skiing and is the direct responsibility of Subcommittee F27.10 on Binding Test
longitudinal axis, positive in the forward direction of the ski;
Procedures.
Current edition approved Feb 10, 2000. Published June 2000. Originally
and the numeral y denoting the lateral axis, the positive
published as F 504 – 77. Last previous edition F 504 – 94.
direction of which is determined by the right-hand rule. The z
Annual Book of ASTM Standards, Vol 15.07.
axis is coincident with the centerline of the test shaft. The
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036. origin of XYZ coordinate system taken to be a point 230 mm
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F504–00
along the axis of the test shaft from the bearing surface of the markers on the boot or ski the center of the boot sole shall be
tests sole for 300 mm test soles. The location is changed located 15 6 0.5 cm behind the center of the ski’s projected
proportionally for soles other than 300 mm. The direction of length unless the relevant ASTM standard applies.
any force applied to the ski is defined by its unit vector. The 6.2 Boot—Four boot soles are defined in Table 2 of ISO
magnitude of a preload force applied to the ski is defined by the 9462. The standard boot sole shall be 300 6 0.5 cm in length
M or M moment created by the force. and shall be adjustable, 64 cm. It shall be constructed of
z y
materials and have a tread pattern as established in specifica-
4. Summary of Test Method
tions. Details concerning boot characteristics shall conform to
the relevant ASTM standard. However, it shall be permissible
4.1 The ski binding is mounted on a standard ski and a
standard boot is inserted into the binding. A relatively stiff test to modify the boot if the binding manufacturer specifies that
shaft instrumented for moments is affixed to the inside of the modification is necessary for proper function of the binding.
boot and attached rigidly to the test frame. The test equipment 6.3 Stiffener—When called for, a channel of dimensions 80
is shown in Fig. 2. mm wide by 40 mm high by 4 mm thick shall be used to stiffen
4.2 Loads sufficient to produce binding release are applied the ski between the near and rear points. The channel shall be
to the binding by forcing the ski to displace relative to the made of 6061 T6 aluminum, or equivalent. The bar shall be
frame until the release occurs. The components of the moments attached to the ski by bolts or screws at near and rear points and
transmitted through the binding to the test shaft are recorded. at a point half way between near and rear.
These records are interpreted to provide the static release 6.4 Test Frame:
moments of the binding.
6.4.1 The test frame consists of all mechanical components
that connect the boot to a stationary reference, including the
5. Significance and Use
boot sole attachment, the test shaft, and the supporting struc-
5.1 This test method involves simulation in the laboratory of ture for the test shaft. The test frame shall include a boot sole
attachment constructed in accordance with ISO 9838 for the
potential injury-producing loads that can occur in skiing,
without implying the frequency or the magnitude of the danger. standard sole.
This test method does not include the simulation of all or part 6.4.2 The angle between the bottom of the boot sole and the
of a skier, and care must be taken not to confuse the values of test shaft shall be 90 6 1 deg in the z−x and z−y planes; the
moments measured by the test shaft with the values of these
positions of centerline of the test shaft relative to the boot shall
quantities that would occur in the tibia of a skie
...
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