Thermal response of grain boundaries in graphene sheets under shear strain from atomistic simulations

► The thermomutability of defective graphene is significantly greater than that of the pristine graphene. ► The reduction of phonon velocity plays the dominant role in the decrease of thermal conductivity. ► The graphene grain boundary with a higher dislocation density has a higher shear failure strength. ► The mutual cancelation between stress fields of neighboring GB dislocations leading to this counter-intuitive observation.