Open AccessA Source Function for a Dynamic Brittle Unilateral Shear Fracture
Author(s) -
Hanson Merle E.,
Sanford Allan R.,
Shaffer Ronald J.
Publication year - 1974
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1974.tb04128.x
Subject(s) - fracture (geology) , shear (geology) , isotropy , closed fracture , geology , brittleness , materials science , mechanics , geotechnical engineering , composite material , physics , medicine , surgery , quantum mechanics
Summary A two‐dimensional brittle unilateral shear fracture was numerically simulated to form and stop in an elastic isotropic continuum. The final displacements and stresses for unilateral fracture were found to be similar to those for bilateral fracture. However, during and shortly after fracture, dynamic differences in the two types of fracture exist. Displacements normal to the fracture are more complex in the unilateral case because the fracture rotates about its instantaneous centre which moves as the fracture grows larger. For displacements normal and parallel to the fracture, the rise times are substantially shorter at the terminal end than at the starting end of the fracture. Overshoot is observed on all displacements near the unilateral fracture model which incorporated a dynamic coefficient of friction equal to 0·05 along the fracture surface.