Joint design theoretical analysis

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... 

Quantitative data requirements for stuctural analysis depend on the design approach and, therefore, the type of analysis to be performed. However, all the theoretical methods for predicting joint strength require ... 

However, let us be under no illusions. It is no easier to predict the strength of a joint from first principles than it is to predict the fatigue life of a steel bar by knowing its crystal structure and the strength of the crystals. Any theoretical predictions must be justified by experiment. There has to be a limit, or rather a collection of limits, set for a given situation. For instance, for a joint which is often used, testing and experience may be better than any analysis. However, an expensive, one-off design in a critical component would repay a careful analysis before metal is cut. 

When a complex joint is to be introduced in a structure, the ideal situation is to test that specific joint. However, this approach is very expensive. Before real joints or prototypes are built, the designer should first come up with a good prediction of the failure load based, among other things, on the basic mechanical properties of the adhesive. The basic properties can mean the elastic properties, such as the Young s modulus and the Poisson s ratio in case the analysis is linear elastic. However, for the more realistic theoretical methods that take into account the nonlinear behavior of the adhesive, the yield stress, the ultimate stress, and the failure strain are necessary. The stress-strain curve of adhesives is necessary for designing adhesive joints in order to compute the stress distribution and apply a suitable failure criterion based on continuum mechanics principles. 

Southwell RV (1946) Relsuration methods in theoretical physics. Clarendon Press, Oxford Stratford T, Cadd J (2006) Elastic analysis of adhesion stresses for the design of a strengthening plate bonded to a beam. Constr Build Mater 20(l-2) 34- 5 IMSL Math/Library Manual (1997) Chapter 5 Differential equations. Visual Numeric, Houston Vable M, Maddi JR (2010) Boundary element analysis of adhesivdybonded joints. Int JAdhes Adhes 30 191-199... 

Darwish SM (2004) Analysis of weld-bonded dissimilar materials. Int J Adhes Adhes 24 347 Darwish SM, Al-Samhann A (2004) Design rationale of weld-bonded joints. Int J Adhes Adhes 24 367 das Neves PJC, da Silva LFM, Adams RD (2009a) Analysis of mixed adhesive bonded joints — Part I theoretical formulation. J Adhes Sci Technol 23 1 das Neves PJC, da Silva LFM, Adams RD (2009b) Analysis of mixed adhesive bonded joints — Part II parametric study. J Adhes Sci Technol 23 35 de Moura MFSF, Daniaud R, Magalhaes AG (2006) Simulation of mechanical behaviour of composite bonded joints containing strip defects. Int J Adhes Adhes 26 464... 

---