Fracture Behavior under Impact. Part 1.
Abstract
The physical behavior of cracks under impact loading is investigated. Single edge cracks or arrays of multiple cracks are considered. The specimens are loaded by time dependent tensile stress pulses moving prependicular to the crack direction. The specimens are directly loaded by an impinging projectile or by a base plate which is accelerated by a projectile. The specimens are made from a transparent model material, Araldite B, or a high strength steel, X2 NiCoMo 18 9 5. The initial crack lengths and impact velocities are varied throughout the experiments. By means of the shadow optical method of caustics in combination with high speed photography, the dynamic stress intensity factors at the tip of the crack are measured as functions of time during the impact event. In particular the critical value of the dynamic stress intensity factor at onset of rapid crack propagation, i.e. the dynamic fracture toughness KId, is determined and discussed with regard to the time tf at which the crack becomes unstable.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1986
- Accession Number
- ADA173900
Entities
People
- J. F. Kalthoff
- S. Winkler