BS ISO 3324-2:2013 pdf free
BS ISO 3324-2:2013 pdf free.Aircraft tyres and rims
The lateral deflection of the tyre is defined as the relative lateral displacement between the wheel flange at a point immediately above the centreline of the contact patch and the loading plate, parallel to the loading plate surface.
The surface of the plate which is in contact with the tyre shall be covered with a material designed to prevent tyre slippage. Lateral load deflection curves shall be obtained by first loading the inflated tyre to the rated deflection under rated load conditions, followed by lateral displacement of the tyre yoke or the flat surface against which the tyre rests in a direction perpendicular to the wheel plane. The lateral displacement may be obtained either by displacement of the yoke or of the flat surface or both.
Lateral load deflection curves shall be obtained by increasing the lateral load from zero to 30 % of the rated vertical load, then by decreasing this lateral force to zero and increasing it in the opposite direction to 30 % of the rated vertical load, and finally returning to 30 % of the rated vertical load, completing the loop. The load, pressure and lateral deflection shall be continuously recorded. This lateral hysteresis loop shall be obtained at a deflection rate not more than 50,8 mm/min.
During this process of lateral deflection the vertical load of the tyre will change somewhat, unless appropriate correction is made. This shall be monitored and adjusted to a constant value equal to the rated load during the conduct of the test.
The vertical sinkage of the tyre accompanying this vertical load adjustment shall be measured and recorded using the same vertical deflection measuring techniques as in 6.5.2. It shall be presented as a plot of vertical sinkage vs. lateral force with the accompanying vertical load and inflation pressure clearly stated.BS ISO 3324-2 pdf download.
