#WRC BULLETIN 452 PDF CRACK#

Sih, in: Fracture Toughness Testing and Its Applications, ASTM STP 381 (1965), p. Rolfe, “Fracture Criteria for Structural Steels,” paper presented at American Society for Metals Conference on Fracture Control, Philadelphia (1970). Irwin, in: Proceedings Seventh Sagamore Ordnance Materials Research Conference, Syracuse University Press, Syracuse, New York (1960), p. Sih, Handbook of Stress Intensity Factors for Researchers and Engineers, Institute of Fracture and Solid Mechanics, Lehigh University, Bethlehem, Pennsylvania (1973).ġ974 Annual Book of ASTM Standards, Part 10 ASTM, Philadelphia (1974), p. Irwin, The Stress Analysis of Cracks Handbook, Del Research Corp., Hellertown, Pennsylvania (1973). Glorioso, “Fracture Control of Aerospace Pressure Vessels,” paper presented at American Society for Metals Conference on Fracture Control, Philadelphia (1970).Ī. Wood, in: Advanced Approaches to Fatigue Evaluation, NASA SP-309 (1972).Ĭ. S.-Japan Cooperative Science Seminar, Tohoko University, Sendai, Japan (1974). Barsom, “The Development of AASHTO Fracture-Toughness Requirements for Bridge Steels,” paper presented at U. Mechanical Engineers, London, England (1971). Mager, “Fracture Mechanics Technology as Applied to Thick-Walled Nuclear Pressure Vessels,” paper presented at Conference on Practical Applications of Fracture Mechanics to Pressure Vessel Technology, Inst.

#WRC BULLETIN 452 PDF CRACK#

Yield stress of the material local to the crack tip σ ysĮ. Tensor notation for the crack tip stress field σ s Radius of the plastic zone at the crack tip sĬoordinate in the plane of the crack Y(a)Ĭrack opening displacement at the crack tip δ cĪngular coordinate measure from the crack plane ν: Stress intensity factor range during fatigue cycling K cĮmpirical exponent in crack growth rate equation N The critical value of J for crack initiation K:

Line integral of equation (14) or potential energy difference of equation (15) J IC This process is experimental and the keywords may be updated as the learning algorithm improves.Ĭritical crack size at maximum stress in service a ptĬritical crack size at maximum stress in proof test BĮmpirical coefficient in crack growth rate equation CĬrack growth per load cycle in fatigue da/dt These keywords were added by machine and not by the authors. To account for these factors, a new design approach, based on fracture mechanics, is being developed and applied in varying degrees to the design of nuclear pressure vessels, bridges aircraft and missiles.

Accordingly, there are three elements to the fracture problem: (1) the initial flaw, (2) crack growth, and (3) crack tolerance. Experience gained from service failures of many engineering structures indicates that most brittle fractures are initiated by small flaws that grow, as cracks, to a critical size during operation. The prevention of brittle fracture is an important consideration because of the sudden and uncontrolled nature of such failures. The hazardous nature of many cryogenic fluids requires the use of conservative design procedures to assure adequate structural safety.

Wrc bulletin 452 pdf