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Full Description
The planning meeting for a conference on Dynamic Crack Propagation was held at M.LT. in February 1971 and attended by research workers from several industrial, governmental and academic organizations. It was felt that a more specialized meeting would provide a better opportunity for both U.S. and foreign researchers to exchange their ideas and views on dynamic fracture, a subject which is seldom emphasized in national or international fracture conferences. Dynamic crack propagation has been a concern to specialists in many fields: continuum mechanics, metallurgy, geology, polymer chemistry, orthopedics, applied mathematics, as well as structural design and testing. It impinges on a wide variety of problems such as rock breaking and earthquakes, pressure vessels and line pipes, comminution and the per formance of armament and ordnance, etc. Advances have been numerous, covering theories and experiments from both the microscopic and macro scopic points of view. Hence, the need for comparing the theoretical and experimental results and bridging the gaps between the atomistic and continuum approaches must be constantly emphasized. It also appeared that the overall problem of dynamic fracture could benefit from a con solidation of crack models proposed for the various types of materials: metals, ceramics, composites, rocks, glasses, polymers and biomaterials.
Contents
I Micro-fracture.- Wave fractographic investigations of brittle fracture dynamics.- Void growth during spall fracture of aluminum monocrystals.- Statistical criteria for microcrack propagation in b.c.c. polycrystals.- Flat fracture propagation in mild steel: some comments on the role of plastic deformation processes.- II Brittle materials and glass.- The small-scale test and its application to fracture propagation problems.- Brittle crack growth under uniaxial compression.- Crack propagation and fracture of rock specimens loaded in compression.- Controlling crack growth in rock.- On the theory of fracture of a brittle body by explosion.- III Ductile materials.- Strength of adhesive bonds—plastic and viscoelastic effects.- Experimental studies of the unstable phase of crack propagation in metals and polymers.- An analysis of shear fracture propagation in gas pipelines.- The mechanical behavior in tension and fracture characteristics of stainless steel thin rolled foils.- Dynamic crack propagation studies in polymers.- Deformation of PMMA at high rates of strain.- Crack velocity measurements in the toughness testing of polymers.- The fracture mechanics of crazes.- Accelerating crack in a viscoelastic solid subject to subcritical stress intensity.- IV Dynamic crack models.- 1. The relation between increase in crack-arrest temperature and decrease of stress wave attenuation by material embrittlement.- A macroscopic dynamic theory of stability and instability of cracks under impulsive loading.- Fracture and dislocation dynamics.- Cohesive force and unsteady propagation of a longitudinalshear crack.- The dynamics of crack propagation in double cantilever beam specimens.- A simple model of dynamic cleavage.- V Continuum experiments.- Recent work on the relations betweenstress pulses and fracture.- An experimental investigation of the velocity characteristics of a fixed boundary fracture model.- Practical applications of crack-branching measurements.- Crack acceleration.- On the propagation direction of bifurcated cracks.- VI Analytical crack problems.- On dynamic crack propagation in elastic—plastic media.- Elastic displacements due to a propagating crack in an infinite medium; an exact solution.- Torsional wave scattering about a penny-shaped crack lying on a bimaterial interface.- On quasistatic and dynamic fracture.- A transient crack problem for an infinite strip under antiplane shear.- The motion of a crack in an elastic solid subjected to general loading.- VII Structures.- Recent studies on brittle crack propagation in Japan.- Dynamic fracture of composite materials.- The dynamic fracture behavior of Borsic—Al composites.- Supersonic crack propagation in ionic crystals induced by strong laser pulses.- The growth law for crack propagation under shock conditions.- A preliminary study of fast fracture and arrest in the DCB test specimen.- Crack propagation and arrest in impacted plates.- A numerical model for plugging failure.- Theoretical and experimental predictions of influence of the machine and initial crack length on fracture propagation and arrest.- The buckling failure modes of rods with large length-to-diameter ratios impacting rigid plates.
