Editorial Type:
Article Category: Research Article
 | 
Online Publication Date: 01 Jun 2008

ASTM Radial Medium Truck Tire Operating Temperatures—Curved versus Flat Surfaces2

Page Range: 82 – 107
DOI: 10.2346/1.2917750
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Abstract

This paper reports the results of an extensive design of experiment (DOE) conducted on radial medium truck tires by the ASTM Committee F09.30 Task Group on Truck/Bus Tire Test Development. These results are from Phase I of the task group’s work, operational (“real world”) tire temperature benchmarking. DOE variables were tire inflation, load, and speed. Response temperatures from embedded thermocouples were measured at apex/ply ending, no. 2/no. 3 belt ending, and shoulder and centerline ribs. Steady-state temperatures for steer, drive, and trailer tires from three different test venues are compared, i.e., flat belt lab machine, road/track, and 1.7 m diam laboratory roadwheel. Results from temperature regression modeling are discussed. Examples of the effects of a curved test surface on tire operating temperatures as well as on tire strain levels are provided. Model predictions are used to compare temperatures and strains of tires running at current Federal Motor Vehicle Safety Standard (FMVSS) 119 test conditions versus a severe service long-haul truck operating condition. The concept of “highway speed equivalency” for laboratory endurance testing is proposed.

Keywords: ASTM; flat versus curved surface; highway speed equivalency; truck tire temperatures
Copyright: The Tire Society
FIG. 1.
FIG. 1.

Pictorial of steer tire DOE.

FIG. 2.
FIG. 2.

Phase I steer tire DOE.

FIG. 3.
FIG. 3.

Phase I drive tire DOE.

FIG. 4.
FIG. 4.

Phase I trailer tire DOE.

FIG. 5.
FIG. 5.

Phase I class 8 long-haul study tires.

FIG. 6.
FIG. 6.

Tire temperature measurement locations.

FIG. 7.
FIG. 7.

Schematic of truck track DOE tires/loading.

FIG. 8.
FIG. 8.

Goodyear steer tire centerline temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 9.
FIG. 9.

Goodyear steer tire belt edge temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 10.
FIG. 10.

Bridgestone/Firestone drive tire centerline temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 11.
FIG. 11.

Bridgestone/Firestone drive tire belt edge temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 12.
FIG. 12.

Goodyear drive tire centerline temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 13.
FIG. 13.

Goodyear drive tire belt edge temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 14.
FIG. 14.

Michelin drive tire centerline temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 15.
FIG. 15.

Michelin drive tire belt edge temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 16.
FIG. 16.

Goodyear trailer tire centerline temperatures: (a) steady state and (b) curved-to-flat deltas.

FIG. 17.
FIG. 17.

Goodyear trailer tire belt edge temperatures: (a) steady state and (b) curved-to-flat deltas.

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