SOME EXPERIMENTAL RESULTS ON ADIABATIC SHEAR BANDING

THE MORK FAMILY DEPARTMENT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCEPRESENTS A SEMINAR
BYD. RittelFaculty of Mechanical Engineering Technion
32000 Haifa, IsraelSOME EXPERIMENTAL RESULTS ON ADIABATIC SHEAR BANDINGABSTRACT Assessing the dynamic mechanical properties of structural materials is an important stage of the design process of structures that must withstand various impacts. This data is mostly needed for numerical simulation purposes, when the dynamic response and eventual failure of a structure is to be evaluated. In this talk, we will address one specific dynamic failure mechanism, namely adiabatic shear banding. Adiabatic shear banding (ASB) is a catastrophic failure mechanism that may develop in certain ductile materials subjected to dynamic loading. The phenomenon itself consists of a narrow band of sheared material, in which the local temperature may reach a significant fraction of the melting temperature, as a result of thermomechanical coupling effects. As of today, there is an overwhelming disparity between analytical-numerical models related to ASB formation, and experimental evidence aimed at verifying a specific criterion or simply bringing physical evidence. This excludes of course the wealth of information related to microstructural aspects of ASB. The Dynamic Failure Laboratory at Technion has been investigating ASB formation from an experimental point of view. This talk will present new results on ASB formation in metals.
Three specific issues will be addressed, namely:1. A physical criterion for the onset of ASB formation
2. The influence of hydrostatic pressure on ASB formation
3. The influence of geometrical imperfections on ASB formationJanuary 26, 2006
2:45-3:30 PM
(Refreshments will be served at 2:30 PM)
SLH 102**ALL FIRST YEAR MATERIALS SCIENCE MAJORS ARE REQUIRED TO ATTEND**

Location: John Stauffer Science Lecture Hall (SLH) - 102

Audiences: Everyone Is Invited

Contact: Petra Pearce