ASTM F780-93a(2012)

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Designation:F780 −93a (Reapproved 2012)
Standard Test Method for
Linear Deformation and Breaking Strength of Alpine Skis
ThisstandardisissuedunderthefixeddesignationF780;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method covers the determination of linear
5.1 This test method shall be conducted on a device (see
deformation load and breaking load for Alpine skis.
Fig. 1) equipped with adjustable supports, a load (F) applica-
tion system (1) with a range of at least 20 000 N and reading
1.2 This test method is applicable to all Alpine skis.
accuracy of 650 N, and with an instrument (2) for reading
1.3 This standard does not purport to address all of the
bending deformation (d) with an accuracy of 0.01 mm. The
safety concerns, if any, associated with its use. It is the
system must have a controlled deflection rate. A standard
responsibility of the user of this standard to establish appro-
universal tension/compression testing machine with X−Y
priate safety and health practices and determine the applica-
recorder (3) is typical of such a system.
bility of regulatory limitations prior to use.
5.2 The test method is made with the ski in its normal
2. Referenced Documents horizontalposition,andtheoverhangingportionsoftheskiare
left free to deflect.
2.1 ASTM Standards:
D2240TestMethodforRubberProperty—DurometerHard-
5.3 The test system shall be set up in accordance with Fig.
ness
1 (Section A) with a 250-mm distance between supports and
F472Terminology for Geometry of Alpine Skis
onesupportmadewitha25-mmdiameter,low-frictionrollerat
point of contact with the ski. The end support shall be so
3. Terminology
designed as to have a hinged clamp which prohibits linear
displacement, yet permits rotation about the support. The load
3.1 Definitions of Terms Specific to This Standard:
is applied through a plate as shown in Fig. 1 (Section B), 25
3.1.1 breaking load (F )—the maximum load applied in
B
mm wide and of length equal to or slightly greater than the
accordance with Sections 6 and 7 (that is, the maximum load
width of the ski, made up of a steel plate (5) and a hard rubber
which the ski can sustain).
(95 65ShoreAdurometer;seeTestMethodD2240)layer(4).
3.1.2 deformation load (F )—the load applied in accor-
D
The plate must be free to rotate under loading ram.
dancewithSection6thatcausesapermanentdeformationof1
mm at the load application point of the ski.
6. Determination of Load Application Point
4. Significance and Use 6.1 In order to obtain comparable values, the test shall be
conducted at the load application point with a separation
4.1 This test method provides information concerning the
between the supports of 250 6 0.5 mm. Determine the load
resistanceofaskitopermanentbendingandanindicationofits
application point by moving the ski in a longitudinal direction
basic strength. It is not intended to evaluate the data with
on the supports until a deflection is obtained under a load of
regard to the quality of the ski.
600 6 5 N in accordance with the table shown below:
Ski Length, L , Deflection, Tolerance,
N
mm (see Terminology F472) mm mm
This test method is under the jurisdiction of ASTM Committee F27 on Snow 1700# L 2 0.03
N
Skiing and is the direct responsibility of F27.30 on Skis and Boots. 1400# L < 1700 4 0.03
N
1000# L < 1400 6 0.03
Current edition approved March 1, 2012. Published April 2012. Originally
N
0750# L < 1000 8 0.03
approved in 1982. Last previous edition approved in 2006 as F780–93a (2006). N
DOI: 10.1520/F0780-93AR12.
This test method is meant to conform in all
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