In this paper, an efficient method to characterize the mode II fracture toughness KIIC for materials with preferred interfaces such as wood, fiber composite materials and bonded materials based on the Iosipescu fixtur...
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In this paper, an efficient method to characterize the mode II fracture toughness KIIC for materials with preferred interfaces such as wood, fiber composite materials and bonded materials based on the Iosipescu fixture is developed. A simple formula for calculating KIIC is verified numerically. Our method is easy to implement and is free of friction thereby offering a more reasonable value of KIIC than previous methods. A calibration chart for composite materials is generated. Finite element analysis along with cohesive elements is used to validate experimental load-displacement curves by testing bonded polymers.
An integrated experimental and numerical analysis is carried out to study the interfacial shear strength of bonded materials. Two types of shear tests, namely the losipescu shear test, and the short-beam shear test ar...
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Visualization of highway traffic environments in virtual reality plays a key role on fidelity of simulation and validity of driving behaviors in driving simulator studies. This paper describes a procedure to replicate...
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Visualization of highway traffic environments in virtual reality plays a key role on fidelity of simulation and validity of driving behaviors in driving simulator studies. This paper describes a procedure to replicate a signalized intersection with many complex features into a driving simulator's 3-D databases through building a graphical visual database, constructing a road motion database, and creating simulated traffic. The validity of the visualization was assessed via the comparison of the drivers' speeds in the simulator and the speed data at the real intersection. It was found that both speed data follow normal distributions and have equal means for each intersection approach;however, that the speeds measured in the driving simulator have a larger variability than those measured in the field. The users' subjective evaluation results indicated that 92% subjects could recognize the simulated intersection in the driving simulator experiment. Therefore, the strategy of geo-specific environment modeling would be useful for studying driving behaviors in virtual environments.
The science and management of environmental- and water-related issues requires an interdisciplinary approach, as recognized by funding agencies, consulting firms, and public organizations. In their role of preparing s...
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Berm soils at small arms firing ranges (SAFRs) are contaminated with metals as bullets impact the soil and corrode. These berms generally lack vegetation and frequently suffer from erosion that may transport heavy met...
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Ash and partially-burned vegetation samples were periodically collected over a year-long period from a natural chaparral site affected by a typical southern California wildfire. Sampling strategy was based on collecti...
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In this study, polycardanol, which was synthesized by enzymatic oxidative polymerization of thermally treated cashew nut shell liquid (CNSL) using fungal peroxidase, was partially or fully cured using methyl ethyl ket...
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