...Leila Ladani; Steven Nelson Mechanical fatigue crack nucleation and propagation is modeled in bimodal grain size aluminum alloy. A multiscale modeling approach in conjunction with a continuum based damage modeling technique, successive initiation, is used to determine microstructural site of crack...

...Volkan Eskizeybek; Ahmet Avci; Ahmet Akdemir; Ömer Sinan Şahin Fatigue crack growth and related damage mechanisms were investigated experimentally in a stainless steel/aluminum laminated composite with middle through thickness crack, and two different fracture mechanics approaches applied...

... in developing the joining process for potential use in automobile manufacturing. Load control cyclic tests were conducted on single weld lap-shear coupons to determine fatigue life properties. Optical fractography of the failed fatigue coupons revealed that fatigue cracks initiated from the interfacial “hook...

.... These results differ completely from the effects of initial tensile overload on the response at a macroscopic notch root or at the tip of a long fatigue crack in which the driving forces for crack formation or growth, respectively, are reduced. The micromechanical simulation results support the incorporation...

... Sleeve System and Countersink Cold Expansion ,” Fatigue Technology, Seattle, WA. Rich , D. L. , and Impellizzeri , L. F. , 1977 , “ Fatigue Analysis of Cold-Worked and Interference Fit Fastener Holes. Cyclic Stress-Strain and Plastic Deformation Aspects of Fatigue Crack Growth ,” American...

...Dennis J. Buchanan; Reji John; Robert A. Brockman Shot peening is a commonly used surface treatment process that imparts compressive residual stresses into the surface of metal components. Compressive residual stresses retard initiation and growth of fatigue cracks. During the component loading...

... 2009 fatigue cracks stress-strain relations multiaxial fatigue strain based approach critical plane notches Real mechanical components are characterized by complex geometries, which result in stress/strain concentration phenomena affecting a small region of material...

...Kedar Kirane; Somnath Ghosh; Mike Groeber; Amit Bhattacharjee A microstructure sensitive criterion for dwell fatigue crack initiation in polycrystalline alloy Ti-6242 is proposed in this paper. Local stress peaks due to load shedding from time dependent plastic deformation fields in neighboring...

...Rajesh Prasannavenkatesan; David L. McDowell; Gregory B. Olson; Herng-Jeng Jou Nucleation of fatigue cracks at nonmetallic primary inclusions in high cycle fatigue of martensitic steel is computationally investigated. We explore the capabilities of an elastic interphase material adhered...

...Gang Deng; Yoshihiko Sakanashi; Tsutomu Nakanishi The development of fatigue in a machine element can be divided into the fatigue crack initiation stage and the crack growth stage. The effects of the surface conditions, such as roughness and surface qualities, on the fatigue strength are considered...

... residual stresses on the entry surface rather than the middle and exit surfaces. Due to the nonuniform residual stress distribution, fatigue crack initiation often occurs on the entry surface. This study proposes a new approach to increase the compressive residual stress magnitude at the entry of the hole...

... in important materials/engineering problems. Specifically, compression induced strain localization in shot peened materials and tension induced strain localization in the plastic zones adjoining the faces of a fatigue crack are profiled. The utility of the EDXRD synchrotron technique for nondestructively cross...

...Liu Liu; Naji S. Husseini; Christopher J. Torbet; Divine P. Kumah; Roy Clarke; Tresa M. Pollock; J. Wayne Jones A novel X-ray synchrotron radiation approach is described for real-time imaging of the initiation and growth of fatigue cracks during ultrasonic fatigue ( f = 20 kHz ) . We report here...

... Opening Displacement Methods for Detecting High Temperature Low Cycle Fatigue Cracks of Circumferential Notched Specimens ,” ASME J. Eng. Mater. Technol. 0094-4289 , 110 ( 3 ), pp. 247 – 252 . Sakane , M. , Ohnami , M. , Awaya , T. , and Shirafuji , N. , 1989 , “ Frequency...

...L. Liu; J. W. Holmes Details are provided for an experimental approach to study the tensile fatigue crack growth behavior of very thin metallic foils. The technique utilizes a center-notched specimen and a hemispherical bearing alignment system to minimize bending strains. To illustrate...

...Spandan Maiti; Chandrashekar Shankar; Philippe H. Geubelle; John Kieffer A numerical model to study the fatigue crack retardation in a self-healing material ( White et al., 2001, Nature, 409, pp. 794–797 ) is presented. The approach relies on a combination of cohesive modeling for fatigue crack...

... in dwell fatigue. crystal plasticity finite element analysis Ti-6242 creep dwell fatigue titanium alloys finite element analysis plasticity crystal microstructure creep elasticity creep testing optical microscopy genetic algorithms fatigue cracks stress effects plastic...

... piezoelectric actuators piezoceramics plates (structures) eutectic alloys tin alloys lead alloys elasticity plasticity fatigue cracks reliability Solder joints play a very important role in surface mounted microelectronic packages, providing electrical and mechanical connections between...

.... A general fatigue criterion is used to predict both fatigue crack nucleation and growth. Notched specimens made of 1070 steel were experimentally tested from crack initiation until fracture. The approach was applied to predict the fatigue life of 1070 steel and the predicted fatigue lives were in excellent...

... 2005 aluminium alloys sheet materials crack-edge stress field analysis fatigue cracks fatigue testing crack detection internal stresses numerical analysis Crack Arrest Crack Growth Dimple Fatigue Life Pinching Force Stop Hole Stress Intensity Factor A crack initiated...