Tire Quasi-Static Envelopment of Triangular/Step Cleats Test
|Publication Date:||1 November 2018|
This SAE Recommended Practice describes a test method for determining properties of a non-rolling tire quasi-statically enveloping either a set of triangular cleats or a single step cleat. In the case of the triangular cleats the normal force and vertical deflection of the non-rolling tire are determined. In the case of the step cleats the normal force, longitudinal force, and vertical deflection of the non-rolling tire are determined. The method applies to any tire so long as the equipment is properly sized to correctly conduct the measurements for the intended test tire.1 The data are intended for use in determining parameters for road load models and for comparative evaluations of the measured properties in research and development.
NOTE: Herein, road load models are models for predicting forces applied to the vehicle spindles during operation over irregular pavements. Within the context of this document, forces applied to the pavement are not considered.
A single procedure is specified. The differences in the test from the standpoint of the two cleat designs are whether the wheel is free to rotate about the spindle and what data must be measured and reported. These are spelled out in the body of this document.
This document is test machine neutral. It may be applied using any type of test machine capable of fulfilling the requirements stated in this document. The test machine must be capable of accommodating the tire sizes to be tested, along with the required cleats.
NOTE: Test results are a function of the Tire/Wheel assembly, not just a function of the Tire alone.