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Predicting Crippling Failure in Composites Using Progressive Failure Analysis

机译:使用渐进式失效分析预测复合材料的脆性破坏

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摘要

Crippling analysis of composite stiffeners is an important step toward satisfyingrncertification requirements for commercial and defense aircraft structures. Cripplingrnanalysis requires an empirically derived point design crippling strength allowable thatrnisdeveloped for each unique material and cross-section geometry. This studyrninvestigates the use of progressive failure analysis (PFA) integrated with arncommercially available finite element code to predict the crippling strength ofrncomposite stiffeners. The PFA is conducted using a combination of thernABAQUS/standard finite element code and Autodesk Simulation Composite Analysisrn(ASCA) software to predict crippling strength of composite Z and C cross-section testrnspecimens. The crippling strength predictions are compared and contrasted withrnexisting test data and crippling predictions made using crippling design curves givenrnin Composite Materials Handbook (CMH-17) Volume 3. The suitability of using PFArnto predict the effects of defects on crippling strengthis also evaluated. This study isrncurrently in progress and preliminary results are reported in this paper.
机译:复合加劲肋的脆性分析是满足商用和国防飞机结构认证要求的重要一步。挠曲分析需要根据经验得出的点设计挠曲强度,该挠曲强度是针对每种独特的材料和横截面几何形状开发的。这项研究调查了渐进式破坏分析(PFA)与可从商业上获得的有限元代码的集成,以预测复合材料加劲肋的破坏强度。使用ABAQUS /标准有限元代码和Autodesk Simulation Composite Analysisrn(ASCA)软件的组合进行PFA,以预测Z形和C形截面复合材料的抗压强度。将其抗弯强度预测值与现有的测试数据和使用复合材料手册(CMH-17)第3卷中给出的抗弯设计曲线所做的抗弯预测进行比较和对比。还评估了使用PFArn预测缺陷对抗弯强度的影响的适用性。目前这项研究正在进行中,并在本文中报告了初步结果。

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