SCHOOL OF MECHANICAL ENGINEERING SEMINAR Monday, January 21, 2013 at 15:00 Wolfson Building of Mechanical Engineering, Room 206

Department of Mechanical Engineering, Ben-Gurion University of the Negev

Shock wave attenuation by means of rigid porous media is often applied when protective structures are dealt with. The passage of a shock wave through a layer of porous medium is accompanied by diffractions and viscous effects that attenuate and weaken the transmitted shock, thus reducing the load that develops on the target wall that is placed behind the protective layer. In the present presentation, a study on the parameters governing the pressure build up on the target wall will be presented. This study was done experimentally in a shock tube facility. During the talk, brief theoretical background will be presented followed by the description of the experimental tool and then the results. In the study, different porous samples were impinged by normal shock waves of various strengths and the subsequent pressure histories that were developed on the target wall were recorded. Based on the obtained results a constitutive model that predicts the pressure history on the target wall was developed. This model can be applied to predict the pressure build-up on the target wall for any pressure history that is imposed on the front face of the porous sample without the need to conduct numerous experiments. Results obtained by other investigators are found to be in very good agreement with the predictions of the presently developed constitutive model. By constructing the model better understandings of the physics govern in this phenomenon was gained and will be present in the talk.

On the Interaction of Shock Wave with Porous Media

Dr. Oren Sadot