Geometry fatigue analysis

Example 11.14. A cylindrical shell that is 36-in. ID by 2.5-in. thick contains a perpendicular nozzle th is 4-in. ID by 0.75-in. thick. The design pressure is 1900 psi at a design temperature of 450°F. The vessel is subjected to cyclic operation and a fatigue analysis is required. Peak stresses and stress concentration factors are not known for the specific geometry to be used. What method can be used to evaluate the peak stresses for a fatigue analysis ... 

The lap shear fatigue test for the joints of the front cab module of the Maglev Transrapid TR08 has been analyzed by a fine detail analysis with 3D solid elements using the real cross-section geometry. The adherend materials are aluminum on one side and GRP on the other see also Section 32.5.1. The PU adhesive Sikaflex -254 Booster is modeled with the Ogden strain energy equation (Eq. (1), with N=2). The computed stiffness correlates well with the test results. The local stress distribution is visualized in Fig. 32.11. 

This chapter will discuss the testing, analysis, and design of structural adhesive joints. Adhesive bond test techniques to be considered include tensile, shear, peel, impact, creep, and fatigue. Some considerations will also be given to the effect of environment and test rate. A continuum approach to the analysis of adhesive joints will discuss tensile, shear, and peel stresses which arise in various joint geometries. Classical theories by Volkersen, Goland and Reissner, and others will be included. References to finite element analysis will be made where appropriate throughout the chapter. 

The system is a 3D geometric construction tool for the improvement of spatial abilities and for the maximization of transfer in real settings. This system has not been formally evaluated in a real course. However, an informal evaluation showed that students were motivated to use it and did not need a long familiarization before using it in practice. Several problems such as eye-hand coordination without haptic feedback and fatigue were also pointed out. As for the possible applications of the system, students mentioned interactive conic sections, vector analysis, intersection problems, and elementary geometry. 

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