According to JIS K6323 / CNS 745, the bending fatigue test is carried out by placing the V-belt on the test device with the specified pulley, rotation speed, and load, and then performing an accelerated test. Its requirements are listed in the table below.
Table 3: Bending fatigue times and variation rate of pulley center distance
Performance Items Bending Fatigue Bending Fatigue Times
Variation rate of pulley center distance after 24 hours.
Table B2 Bending fatigue test conditions
Types of V-belts Speed range of drive pulley Force (F) N Reference length of V-belt for testing