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Showing 1 to 17 of 17 for “"subcritical crack growth"”.
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Subcritical crack growth in polysilicon MEMS
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Subcritical crack growth in zirconium alloys
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Internal hydrogen-induced subcritical crack growth in stainless steels
… with optical calibration was used to monitor the crack growth position, continuously.
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Micromechanics of Hydrogen-Induced Crack Initiation in Pipeline Steels and Subcritical Crack Growth
… on ductile fracture, we model sustained-load cracking in the iron-base superalloy 1N903 at hydrogen pressures at which fracture is governed by plasticity. Through a micromechanics analysis, we quantify the void growth dependence on stress triaxiality and hydrogen-induced material softening as …
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Mechanism of subcritical crack growth in the alumina reinforced aluminum-copper composite: Effects of interface and matrix microstructure
Micromechanisms of fracture and fatigue crack growth were examined in an $\rm Al\sb2O\sb3/Al$-Cu composite and its matrix alloy, with particular emphases on effects of matrix and interfacial microstructure. The matrix and interfacial microstructures were controlled by aging the composite to …
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Durability of Polymer /Metal Interfaces Under Cyclic Loading
… was applied by a piezoelectric actuator. Subcritical crack growth was observed along the epoxy/aluminum interface and the growth rate was found to depend on the magnitude of the applied electric field. Kinetics of the crack growth was correlated with the piezoelectric driving force. The …
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Failure of asperities by hydraulically induced fatigue: a model for the generation of intraplate seismicity
… by the tensile failure of asperities by subcritical crack growth. The principle subcritical crack growth mechanism is fatigue driven by cyclic tensile stresses within an asperity. Cyclic stresses result from cyclic pore pressure variations which propagate from the Earth's surface because …
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Comparative study of physical properties of zirconia based dental ceramics
… flexural strength, hardness, fatigue, and subcritical crack growth. Crown shaped specimens (Kavo Everest ZS-blanks with IPS e.max® Ceram and IPS e.max® Zirpress) were submitted to the fatigue followed by biaxial flexural strength test. The microstructure was analysed using AFM, and …
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Mechanism of Fatigue Crack Growth at Polymer/metal Interface
Fatigue crack growth along an Al/epoxy interface was examined under mixed-mode conditions. To provide different combinations of Mode-I and Mode-II conditions, a flexural peel (FP) technique was developed, which proved to be particularly useful for subcritical crack growth studies. Using this …
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Fracture of Hot-Pressed Silicon Nitride at Elevated Temperatures
… This peak corresponds to the onset of subcritical crack growth prior to catastrophic failure. Subcritical cracking is believed to occur by the nucleation, growth and coalescence of cavities in the secondary, amorphous grain boundary phase. The coalescence of cavities along with grain …
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Mechanics and subcritical cracking of FRP-concrete interface
… for the FRP-strengthened RC beams. Small cracks usually exist within the FRP-concrete interface, making fracture mechanics a more appropriate tool to evaluate the integrity of the FRP-concrete interface. Analytical solutions of energy release rate (ERR) and its phase angle at the tip of a …
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ZrB2-SiC Based Ultra High Temperature Ceramic Composites: Mechanical Performance and Measurement and Design of Thermal Residual Stresses for Hypersonic Vehicle Applications
… ratio of the trans- and intergranular fracture; crack branching or bridging, microcracking, subcritical crack growth and others, as they govern crack propagation–induced energy dissipation and affect the toughness and strength of the ceramic material. Therefore, understanding the evolution of …
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Investigation of the mechanical behavior of rim/blister structure hydride phases in Zircaloy-4 by utilizing high energy synchrotron X-ray diffraction
… problematic. One issue is the delayed hydride cracking (DHC) phenomenon which occurs during storage of used nuclear fuel (UNF). DHC is a time-dependent subcritical crack growth mechanism that can be induced by tensile stress hoop stress within the fuel cladding, even when this hoop stress is …
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The Effects of Load Ratio on Threshold Fatigue Crack Growth of Aluminum Alloys
… structures are threatened by the presence of cracks. Structural failure occurs if a crack larger than a critical size exists. Although most well designed structures initially contain no critical cracks, subcritical cracks can grow to failure under fatigue loading, called fatigue crack growth …
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Determining Interfacial Adhesion Performance and Reliability for Microelectronics Applications Using a Wedge Test Method
… aggressive environments. Plots describing - G (crack velocity versus applied strain energy release rate) characteristics for a particular set of environmental conditions are presented and a comparison is made for different environmental conditions to quantify the subcritical debonding behavior …
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Experimental and Numerical Investigations on the Durability and Fracture Mechanics of the Bonded Systems for Microelectronics Application
Water-assisted crack growth at an epoxy/glass interface was measured as a function of applied strain energy release rate, G, and temperature using a wedge test geometry. The specimens consist of two glass plates bonded with a thin layer of proprietary epoxy adhesive. The crack fronts along the …
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Design and Performance of Cold Bent Glass
… statistical analysis methods and sub-critical crack growth). The limited availability of naturally aged toughened glass and the absence of a reliable ageing standard impede the evaluation of its aged performance. Therefore, a parametric experimental investigation of artificial ageing methods on …