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Katunin, A., Dragan, K., & Dziendzikowski, M. (2015). Damage identification in aircraft composite structures a case study using various non-destructive testing techniques. Composite Structures, 127, 1-9.
The research article shows that the application of composite structure has become increasing popular in the aerospace industry based on their unique properties, which include excellent weight ratio, strength, and corrosion resistance. To ascertain a safety of composite elements and structural integrity on aircraft, it is critical to test the structural integrity. Thus, the authors test three composite structures developed from plastic, glass fiber reinforced, and hybrid composite along with the core manufactured using the same aluminum fact sheets and materials. The authors perform the test using various techniques that include ultrasonic, PZT sensing, vibration -based in section and thermography to analyze the application of the methods on aircraft elements. The results of the analysis reveal that pulsed thermography and ultrasonic scanning have allowed the effectiveness in localization and detection of introduced impact damage. However, the ultrasonic scanning reveals the detailed damage evaluation than the thermographic technique.
Ampatzidis, T., & Chronopoulos, D. (2016). Acoustic transmission properties of pressurized and pre-stressed composite structures. Composite Structures, 152, 900-912.
The authors examine the effect of the pre-stress that includes pressure and tension on acoustic behavior...
Ampatzidis, et l. (2016) use the two-dimensional WFEM layer to calculate the STL (sound transmission loss) of the thick structure when accounting the antisymmetric and symmetric wave motion. The authors also predict the dispersion characteristics of two sandwiched structured and dimensional layered using the "WFEM (Wave Finite Element Method)" (Ampatzidis, & Chronopoulos, 2016 p 152). Ampatzidis, et l. (2016) also examine the pre-stressed and non-stressed scenarios, and are able to form a polynomial eigenvalue problem after extracting the stiffness matrix and mass of a small periodic segment of the composite structure "using commercially available Finite Elements software." (Ampatzidis, & Chronopoulos, 2016 p 152). The article also investigates the monolithic in both compression and tension while examining the sandwiched in laminate internal core pressure along with the compression and tension aspect. Moreover, the article calculates the important of SEA quantities and loss factor using the modal density. The results reveal that pre-stress affects the wave dispersion curves and loss factor leading to an alteration of radiation efficiency, modal density, and TL behavior.
Garnier, C., Pastor, M., Lorrain, B., & Pantale, O. (2013). Fatigue behavior of impacted composite structures. Composite Structures, 100, 443-450.
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The aim of this study is to evaluate the use of experimental data combined with semi-empirical procedures to predict the strength of joints and basic laminate properties function. With an increase in the use of advanced composite structural materials, there is a need to enhance a greater understanding of the mechanical behaviors and mechanically fastened joints. The authors present a comprehensive review of the literature to enhance a greater understanding of "mechanics of mechanically fastened joints in polymer -- matrix composite structures." Thoppul, Finegan, & Gibson, 2009 p 301). The authors also examine relevant mechanical test standards and method. The review is followed by a discussion of joint design methodology, mechanical design, the influence of fastener preload selection and geometric effect. The article also examines the bearing failure along with the failure prediction both in dynamically and statically loaded joints. Finally, the study evaluates the effect of moisture and temperature on failure and strength.
Konka, H. P., Wahab, M. A., & Lian, K. (2013). Piezoelectric fiber composite transducers for health monitoring in composite structures. Sensors and Actuators, A194, 84-94.
Konka et al. (2013) investigate "sensing characteristics of piezoelectric fiber composite transducers (PFCTs)" (p 84) to evaluate an effectiveness of embedded sensor within the composite structures in order to monitor strain and stress concentration level. The PECT is used to predict the possibility of damage under the dynamic loads to avoid brittle failures and eventual catastrophic. The article believes that the PFCT is an ideal choice for the application of composite structures because it is easily embeddable, highly flexible, and highly compatible with composite manufacturing strategy. It is also believed that PECT is able to withstand stress when inside the composite structures.
Opportunities . Indian elevator market growth is very promising in the 1995 timeframe, which is when this case study takes place. The low-end of the Indian elevator market is experiencing 27% increases in unit shipments, and 17% unit increases overall. . The market itself is highly fragmented for elevators in India. 70% of the demand for elevators is at the low-end of the market; 20% at the middle-end, and 10% at the top-end. . High levels of recurring
curriculum committee proceed with the work yet to be done? The curriculum committee should solicit information from all stakeholders, including part-time faculty, current students, and also the five acute care hospitals which are a part of the university network. It should create a map for future curriculum development, complete with specific deadlines for a timeline of activities. Unless goals are specifically set with a deadline-driven focus, it is far too
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Green Mountain Case Study Green Mountain Resort Case Study Gunter is definitely a very charismatic and devoted leader. He is leading not only by example but through strong motivation. Clearly, Gunter is heavily invested in the project. He and the fellow former bankers bought the Green Mountain project in order to establish a community that they would feel proud living in. Gunter was even of the Green Mountain Resort group before the
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