... Finite element analyses were performed for varying crack tip or notch geometries and temperatures in C(T) specimens of CM247LC-DS Ni-base superalloy used in gas turbine blades to understand the accumulation of creep strains at notches. The constitutive models used considered elastic-primary...

... This paper deals with the behavior of a crack in the residual stress field induced by butt weld in a wide plate. It is known that the distribution pattern of residual stress is similar regardless of welding process, though the size and the magnitude of the residual stress depend largely...

... will include vintage literature on terra cotta construction, as well as the experience gained by the authors while investigating and repairing terra cotta facades. terra cotta facade anchor spall crack cladding deterioration Kurt IL Hoigard,l George R. MulhoUand,1and Robert C. HaukohiI Terra...

... An advanced model has been developed to calculate interactions between plasticity and roughness closure mechanisms resulting in the fatigue crack growth threshold. Near-threshold closure is complex because multiple closure mechanisms are likely, including roughness-, oxide-, and plasticity...

..., stack effect, and mechanical ventilation; air leakage, modes, and test methods; climate effects; air barriers, insulation materials, and their placement in cavity walls, veneer walls, and single wythe walls; methods for sealing cracks and joints; and building code requirements. Thirty-one references...

... Most of the assessment equations for C t , which is a well-known fracture parameter characterizing creep and creep-fatigue crack growth rates, have limited applicability to constant load conditions. However, crack growth due to creep can also occur under varying load conditions when the load...

... presented were developed by the authors for application on a variety of consulting projects, primarily involving marble and granite. Repair methods are discussed for addressing minor chips, spalls, partial missing pieces, cracks, and defective or ineffective anchorages. Guiding concepts behind the repairs...

... A series of fracture tests on large-scale, pre-cracked, aluminum alloy panels was carried out to examine and to characterize the process by which cracks propagate and link up in this material. Extended grips and test fixtures were specially designed to enable the panel specimens to be loaded...

... The experimental analysis of high temperature fracture in Aluminum Alloy 2519-T87 presented in Part I of this paper highlighted the creep-brittle fracture characteristics of the material and showed reasonable correlation of crack growth rates with the stress intensity factor K . Part II...

... When turbines are started up in power plants, the procedures recommended by the manufacturer should be carefully followed. However, many utilities often start turbines so fast that they accelerate the crack growth of existing cracks. Hence, in order to accurately predict the crack growth life...

... On-line crack detection and crack depth measurements have been carried out using a novel sensor. The sensor is based on an advanced alternating current potential difference (ACPD) technique. This sensor makes use of a new technology called current focusing (CF) which allows the current...

... A full-field thermoelastic technique for measuring stress intensity factors in dynamically loaded fatigue crack specimens is outlined. Thermoelastic Stress Analysis (TSA) uses an infrared focal plane array detector and high-speed processing electronics to produce stress images of cyclically...

... The problem of a piezoelectric ceramic containing a defect such as a hole or crack is addressed from a two-dimensional point of view with general coupling taking place between the electrical and mechanical variables. Complex potentials are derived to describe the general electromechanical...

... In this paper the plane elasticity problem of two bonded orthotropic infinite strips containing collinear cracks perpendicular to the interface is considered. By extending the cracks to the boundaries and to the interface the problem of a crack terminating at an interface and the free edge...

... A quasi-three-dimensional analysis for an elastic crack at the interface between two semi-infinite dissimilar plates is conducted. The governing equations of the Airy stress function and the out-of-plane displacement are deduced based on the kinematic assumptions for quasi-three-dimensional...

... Singular integral equation method has been applied to a lot of crack problems. However, the method has not been widely applied to stress concentration problems such as notch, hole, cavity, or inclusion. In this paper, general solution for elliptical boundaries is formulated in terms of singular...

... of this model include: (1) It can predict the initial crack location and time and the subsequent crack growth paths; (2) The damage analysis is almost the same as in traditional viscoelastic finite element analysis; (3) It can be applied to a complex structure with any loading; (4) It provides a full-field...

... The C t parameter has been proposed for characterizing creep crack growth rate in the small scale to extensive creep regimes. In this paper, creep crack growth data from compact specimens ranging in widths from 50.8 to 254 mm and in thickness from 63.5 to 6.3 mm are analyzed to evaluate...

... The redistribution of impurity atoms in a metal under irradiation can lead to significant embrittlement. We demonstrate that the accumulation of impurity (in particular, helium) atoms in a crack can result in steady monotonous growth of the crack for some time until the limiting crack size...

... A finite element model is presented that can simulate crack growth in layered structures such as lap joints. The layers can be joined either by rivets or adhesives. The crack is represented discretely in the mesh, and automatic remeshing is performed as the crack grows. Because...