Blade deformation and fragmentation: If subjected to abrupt loading or extreme heating on the converter, pump and/or turbine blades can be deformed, separated from their hubs and/or annular rings, or may split up into fragments. This fluid coupling lets the motor to continue working even when the car is stationary, https://cashwhrzg.blogrelation.com/40206895/little-known-facts-about-torque-converter-clutch