On the temperature distribution at the vicinity of dynamically propagating cracks in 4340 steel

摘要: Abstract T he heat generated due to plastic deformation at the tip of a dynamically propagating crack in metal causes large local temperature increase which is expected affect selection failure modes during dynamic fracture and thus influence toughness material. The distribution tips cracks two treatments AISI 4340 carbon steel was investigated experimentally using an array eight high speed indium antimonide, infrared detectors. Experiments were performed on wedge loaded, compact tension specimens with initially blunted cracks, producing speeds ranging from 1900 730 m/s. measurements provide spatial near specimen surface. Temperature increases as 465° C over ambient region intense heating (greater than 100° rise) covered approximately one third active zone observed profiles clearly show three-dimensional nature process surface valuable information regarding formation shear lips their role dissipation energy growth. Preliminary side-grooved are also reported.