When beating a husband is permissible is a very delicate and subtle decision that only a well accepted beis din of big talmidei chachomim can pasken. Because sometimes halachicly a beis din is permitted to beat a recalcitant husband to force him to give a Get, and it is a valid Get. Other times it is impermissible for a beis din to beat a husband who refuses to give a Get, to force him to give one. And if they do beat him, or even apply lesser impermissible pressures, the resulting Get is invalid.
