Programming Method For Multi-crack Damage Tolerance Analysis Of General Structures

It is well known that the life prediction of structures in the presence of multiple cracks is very complex and difficullt in structural damage tolerance design. Just for the complexity and difficulty, most of the existing programs for analysing multiple crack growth have been developed only for certain crack modes of given structures. But in the case of new structures or even another new cracking mode initiated in the same structure, as the structural conditions have been changed, the existing programs have not the ability of konwing the change and also have not the ability of analyzing the new case. This limitation results that these programs could not well meet the needs for analysing new cases in structural damage tolerance design. For an effort to solve this problem, the thesis presents a new programming strategy for analyzing new structire with multiple cracks which attempts to free the analysis program from the limitation of structural conditions by development of a message exchange paltform for obtaining the charges of structural condition. For this purpose, a series of classes for multiple crack damage tolerance analysis are well designed and implemented in C++ language. An integrated application program with friendly interfaces and favorable windows styles is developed by using these classes, and some examples are described by using the application program.The results show that the programming strategy for analyzing new structire with multiple cracks is feasible and successful, the application program based upon this programming meets the need for analyzing new structure in damage tolerane design.