Joint design experimental analyses

The alumina-superalloy joints are intended to withstand high service temperatures (700 -1000 C) and thermal cycles typical in power generation processes. The fabrication of a joint should provide a relatively good strength but more important that it will remain relatively stable in the service conditions. Therefore, experimental studies for the joint design optimisation should be carried out and the data for novel procedures and for modelling the FG-structure and FE-analysis should be created. 

A control mechanism has been proposed on the basis of the joint analysis of the experimental and theoretical information. The control scheme leading selectively to the formation of CpMn(CO)3+ is represented in Figure 6(b). The experiment realized with an optimal laser field is simulated by one pump pulse (at 3.49 eV) followed by a probe pulse (at 4.716eV) designed with the adequate properties of phase, frequency, and duration. Within these specific conditions, the quasi-bound state c A is populated selectively and the CO dissociation... 

In any case, both the FEA/ERR analysis from this study and the experimental results cited from the literature clearly demonstrate the importance of considering adherend thickness in the design of Joints. Test results and commonly used design rules that ignore this aspect of adhesive joints should be used with great caution. 

McCarthy MA, Lawlor VP, Stanley WF. An experimental study of bolt-hole clearance effects in single-lap, multi-bolt composite joints. J Compos Mater 2005 39(9) 799—825. Hart-Smith LJ. Design and empirical analysis of bolted or riveted joints. In Joining fibre reinforced plastics. Elsevier Science 1987. pp. 227—69. 

Because there are so many geometries of adhesive joints encountered, and so many types of stress applied (tension, shear, torsion, thermal, etc.), the analysis of a given system must be tailored to meet the specific application. The processes of experimental design and data analysis, therefore, become quite complicated. It should also be kept in mind that flaws such as those often implicated in adhesive failure can also lead to apparent cohesive failure in the bulk material. 

Post-analysis of Japanese-American Shielding Program for Experimental Research (JASPER) was continued. The Flux Monitor Experiment and the Special Materials Experiment were evaluated in detail. Analytical results of JASPER were effectively utilized in the Demonstration FBR shielding design review, which was conducted in the joint study of Japan Atomic Power Company (JAPC). 

To increase the experimental possibilities and flexibiUty a new UHV chamber for analysis is currently designed. Is will replace the old main chamber and include the additional techniques FEED and XPS, an updated version of the MIESAJPS setup as well as a new crystal holder. Further, sample deposition will be integrated on the chamber in form of a new manipulator with possibilities to heat and prepare the sample upon deposition. The new setup is an important step in order to help to pursuit the joint approach of both UHV and ambient more efficiently. 

Tong L, Steven GP (1999) Analysis and design of structural bonded joints. Kluwer, Boston Van Tooren MJL (2004) Experimental verification of a stress singularity model to predict the effect of bondline thickness on joint strength. J Adhes Sci Technol 18(4) 395-412... 

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