简介:Aprobabilistieprogressivefailureanalyzingmethodisappliedtoestimatingthereliabilityofasimplysupportedlaminatedeompositeplatewithaninitialimperfectionunderbi-axialeompressionload.Theinitialimperfectionandthestrengthparametersareconsideredasrandomvariables.Ply-levelfailureproba-bilityisevaluatedbythefirstorderreliabilitymethod(FORM)togetherwiththeTsai-WustrengtheriterionandTancriterion.Currentstressesinthelaminatedstructurearecalculatedbytheclassicallaminationtheorywiththestiffnessmodifiedbasedonthelaststepplyfailure.Probabilistieallydominantply-levelfailurese-quencesleadingtooverallsystemfailureareidentified,basedonwhichthesystemfailureprobabilityisesti-mated.Anumeriealexampleispresentedtodemonstratethemethodologyproposed.Throughparameterstud-iesitisshownthatthedeviationoftheinitialimperfeetionandsomeofthestrengthparameterslargelyinflu-encethesystemreliability.
简介:纤维增强的聚合物(FRP)composites逐渐地正在被用于修理并且通过粘合剂预制长带/板和织物的湿上篮结合败坏的具体结构的部件加强。因为重要性,界面的契约失败模式吸引了研究人员的注意。现在的学习的目的是分析连续横梁由FRP加强了的增强的水泥的接口失败机制。一个分析答案第一被介绍了预言模型的全部debonding过程。现实主义的双线性的契约滑倒界面的法律被采用学习这个问题。装载模型的裂缝繁殖过程被划分成四个阶段(橡皮,有弹性弄软,elastic-softening-debonded和softening-debonded舞台)。在他们之中,elastic-softening-debonded舞台有四亚阶段。方程被增加合适的压力和排水量边界条件解决。最后,契约长度的批评价值决心在由解决同时线性的代数学的方程有效的纸做失败机制。如果concrete-to-plate棱柱的轴的僵硬比率足够大,在上面、更低的FRP盘子之间的相互作用能被忽视。