Dynamic Fracture Mechanics
Covering a wide variety of topics in dynamic fracture mechanics, this volume presents state-of-the-art experimental techniques and theoretical analysis on dynamic fracture in standard and exotic materials.
TABLE OF CONTENTS Dynamic Fracture Mechanics
Chapter 2: Dynamic Crack Initiation Toughness
Daniel Rittel,
Faculty of Mechanical Engineering, Technion,
Faculty of Mechanical Engineering, Technion,
32000. Haifa, Israel, merittel@technion.ac.il110
The dynamic crack initiation toughness is a measure of material resistance to fracture under transient loading conditions. As of today, there are no standardized techniques for the assessment of this property. This chapter provides a detailed presentation of recently developed experimental techniques, largely based on the author's experience. Each technique is thoroughly and critically discussed to provide the necessary background for the practitioner. Selected results are described in an attempt to establish a relationship between microstructure aspects and mechanical characteristics. Future directions are pointed out.
1 Introduction
Since the early days of Griffith, fracture mechanics has made considerable progress, and from a practical point of view, one considers that the resistance of a material to crack propagation (fracture) under quasi-static conditions is represented by the so-called fracture toughness K IC. Recommended experimental procedures are available for the selection of the specimen, loading conditions and processing of the results [1]. However, quasi-static loading conditions are not always encountered and structures must frequently withstand transient loading conditions, subsequently referred to as dynamic loading. The subject of dynamic fracture mechanics has for long aroused much scientific interest, and basic solutions are available for two selected cases: the dynamically initiated crack and the rapidly propagating crack [2], [3]. The dynamically propagating crack has traditionally drawn much more attention, in both its analytical and experimental aspects with emphasis on the maximum achievable crack speed and the issue of...
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