acting on a Pallet
The stress that occur within a loaded pallet when it is resting on a flat surface is relatively small
because the weight is supported by the blocks and only the deck is subjected to a bending force.
When the pallet is lifted
(by a forklift), the amount of stress present depends on how closely the forks are spaced.
The forks of a pallet truck are normally spaced about 686mm
apart and in some cases, allowance for narrower fork spacing of 533 mm,
and assuming that the racking beams have a 75mm over-hang on each side.
The closer the forks are together,
the greater the amount of stress and vice versa. Therefore, when pallets are
stacked in blocks and the top surface of the underlying (bottom) load is uneven, the bottom deck boards will be subjected to a certain amount of stress.
A loaded pallet is subjected to higher static
stresses when it is supported in ordinary pallet racking or
stacking than when it is lifted by forked machines.
The relative magnitude of
the bending moment (ceteri paribus) and the stated conditions. The relative severity of the loading
conditions resulting from the different types of support and that the
bending moment, increases disproportionately with the size of the pallet.