METHOD FOR MEASURING TRANSIENT OUT-OF-PLANE DEFORMATION DURING IMPACT

There is no standard methodology to measure the transient deformation of a material under impact. High speed photography can be used to capt ure the deformation but is limited to one projected plane of view. The knowledge of the entire deformed field and its time history of a mate rial is of great interest to many researchers. This investigation will employ a shadow moire and high speed photography method by which the entire deformation history of the surface can be measured. Shadow moir e Is a technique to measure out-of-plane displacement using a linear g rating and the interference fringe patterns that occur during deformat ion are recorded using a high speed camera. The recorded fringe patter ns are enhanced and processed with a data analysis code to map out the history of the displacement field of the entire rear surface of the t arget during the impact. Copyright (C) 1996 Elsevier Science Ltd.