... of closure are discussed in the light of microstructural and environmental influences on near-threshold fatigue. fatigue (materials) cracking fracturing crack propagation load ratio environment crack closure alloy steels pressure vessel steels thresholds fracture mechanics S. Suresh^J...

... Currently, two polymeric materials, Homalite 100 and Araldite B, are extensively utilized in the study of dynamic fracture. Homalite 100 is employed in the dynamic photoelastic studies of Dally et al of the University of Maryland, and Kobayashi et al of the University of Washington. They have...

... methods, experimental methods, and engineering estimates. The present paper assesses the accuracy of the various solutions by correlating fracture data on surface-cracked tension specimens made of a brittle epoxy material. Fracture of the epoxy material was characterized by a constant value of stress...

... particles dispersions fatigue damage fracturing crack propagation Campbell Laird ^ The General Cyclic Stress-Strain Response of Aluminum Alloys REFERENCE: Laird, Campbell, "The General Cyclic Stress-Strain Response of Aluminum Alloys," Cyclic Stress-Strain and Plastic Deformation Aspects of Fatigue...

... The results of an experimental investigation on the fracture behavior of unidirectional and multidirectional laminated graphite/epoxy composites is reported. Critical tensile fracture stresses for constant head rate uniaxial specimens containing single-edge notches, double-edge notches...

... There is strong evidence that weaker composites, regardless of fiber content, tend to cleave on a single plane, while stronger specimens exhibit extensive fracture zones as a result of cumulative damage. This type of behavior is the same before and after thermal cycling of specimens up to 500...

... An equation has been derived which will permit plane-strain fracture toughness, K Ic , to be calculated from a knowledge of uniaxial tensile properties. After corrections for constraint and strain hardening the plane-stress rigid plastic crack opening displacement expression was found...

... A two-parameter fracture criterion has been derived which relates the linear-elastic stress-intensity factor at failure, the elastic nominal failure stress, and two material parameters. The fracture criterion was used previously to analyze fracture data for surface- and through-cracked sheet...

... A physically based statistical theory of fracture for polycrystalline bulk graphite is presented. It is based on the inherent weakness of graphitic grains normal to the a–b plane and a coincidence alignment of these planes which has been found to have a dominant influence on strength...

.... For compression overloads, the OLR ranged from -2.0 to -4.0. High compression overloading was detrimental and dependent upon subsequent R ratio loading. Substantial fracture surface abrasion near the mid-thickness occurred for higher negative R ratios. Striations were not readily found in this region, however...

... of the initial portion of the stress-strain curve. composite materials boron aluminum laminates responses cyclic loads fibers fracturing rotation experimentation stress analysis C. C. Chamis 1 and T. L. Sullivan t Nonlinear Response of Boron/Aluminum Angleplied Laminates Under Cyclic Tensile...

... A titanium-21 weight percent germanium eutectic alloy was unidirectionally solidified at two different rates to produce a composite material strengthened by intermetallic Ti 5 Ge 3 fibers. The higher solidification rate produced a composite with fibers of finer diameters. The fracture behavior...

... predictions for flow line directions from a proposed strip compression model agree with the experimentally determined angles. composite materials consolidation pressure diffusion bonding metal composites friction flow stress hot pressing compression tests debonding fracturing limit anaylysis...

... initiation occurred. The fracture toughness of each type of laminate was determined and both the residual strength (the nominal stress to which a panel which did not fail during performation can be loaded) and the threshold strength (the lowest pre-impact stress which results in failure upon impact...

... fracture criteria under the combined modes of K I and K II , K I and K III and K I , K II , and K III for the 4340 steel. These results are compared with the results of other investigators obtained for different materials. For the combined Mode I-II tests, it was found that the presence...

... a two-dimensional simulation of actual pavement conditions under traffic loads. The dimensions of the beam were designed such that plan strain conditions prevailed during fatigue loading. Fracture mechanics concepts using linear elastic theory were employed to analyze test data, including stress...

... The dynamic fracture toughness, K Id , was measured in a number of ferrous alloys using precracked Charpy specimens and an instrumented impact machine. The alloys investigated included quenched and tempered steels (H-11, D6AC, and 4340), 18Ni maraging steels (grades 200, 250, and 300...

... Advanced fiber composite materials exhibit elastic properties and fracture mechanisms distinctive from metals. Consequently, the mechancis of impact resistance are also different for these materials. Carbon-epoxy and boron-epoxy composites can exhibit brittle modes of fracture. In studies...

... Rice's path-independent integral J of medium-strength alloys was determined under dynamic conditions by instrumented impact testing of precracked Charpy specimens. The viability of the instrumented Charpy technique for rapid and easy determination of useful fracture parameters is explained...

... ) and strain rates. The influence of secondary creep fracture is examined in the light of results of holdtime tests. fatigue (materials) fracturing stainless steels magnesium alloys crack propagation temperature strain rate crack initiation transgranular corrosion intergranular corrosion, creep...