For the fine solution of this problem , the author has made an attempt to introduce the object - oriented technique to damage tolerance analysis . a set of basic and auxiliary classes , based upon some important concepts of object - oriented technique , which can be directly used for the development of programs of damage tolerance analysis has been designed and implemented by c + + language 为此，本文将面向对象的程序设计方法引入到损伤容限分析中，运用面向对象观点对损伤容限分析方法和数据需求作了全面分析，设计了一套损伤容限分析的基本类库和辅助类库，建立了损伤容限分析的对象模型，并采用c + +语言进行了实现。
The fem model was accurate and effective by using submodel and error estimation technique that ensured the reliability of calculation and analysis . the thesis got the measure of critical flaw and designing life of the girder . in addition , the thesis calculated the remaining life of the girder while the flaw reaching 150mm 结合有限元分析结果和损伤容限设计方法，本文计算了马钢第三炼钢厂4 # 125t铸造起重机主梁下盖板的临界裂纹尺寸，及初始裂纹为0 . 5mm时主梁的设计寿命，并估算了在裂纹尺寸达到150mm时主梁的剩余寿命。
The reasons focusing only on ray travel times are " noise tolerance could be enhanced and the sensitivity to the environment model mismatch may be reduced by neglecting amplitude information ; phase ambiguity is eliminated by employing the group delay of arriving wave packets ; travel times are pseudo - linear functions of sound speed profiles of the medium , and the perturbation of ray travel time is much smaller than sound pressure ' s 之所以选择声传播时间的原因是：噪声容限可以得到提高，并且传播时间的计算可以不考虑声压的信息，从而降低了对环境模型失配的敏感性；相位的起伏也可通过到达包络的群延时来消除；传播时间是介质声速分布的伪线性函数并且传播时间的起伏远小于声压的起伏。
The content includes the study on the fatigue performance of the plexiglas , the compiling of the load spectrum of the canopy , the study on the evaluation of the fatigue life of the canopy glass , the study on the allowable limit of the scratch on the canopy glass and the study on the analysis method of the dynamic response of the bird impact on the aircraft windshield 所涉及的内容包括:有机玻璃疲劳性能研究、活动舱盖载荷谱编制、座舱玻璃疲劳寿命估算方法研究、座舱玻璃划伤故障容限研究、飞机风挡鸟撞动响应分析方法研究等。根据活动舱盖载荷特性,提出用压力传感器测量活动舱盖载荷的方法,并首次实现了活动舱盖载荷谱飞行测量。
As the damage tolerance technique has being widely and deeply adopted in the design and life prediction of aircraft structures , the development of high performance and more suitable software used in damage tolerance design and assessment is more urgent . while at the same time the existing domestic software is not well suitable for requirements in engineering 随着损伤容限技术在飞机结构设计和寿命评估中的广泛采用，研制高性能且实用的损伤容限分析与评定软件系统越来越迫切，而国内现有的损伤容限分析软件经实践证明其性能和适用性不能很好满足工程需要，特别是结构剩余强度和裂纹扩展分析程序。
