Stochastic Materials Design of Fiber Reinforced Composite Laminates

纤维增强复合材料层压板的随机材料设计

• 批准号: 01460096
• 负责人: MIYANO Yasushi
• 金额: $ 3.65万
• 依托单位: Kanazawa Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460096/
• 关键词: fiber reinforced composite laminates; stochastic materials design; multiple layer laminate; mechanism of failure; failure probability; simulator for failure; reliability; safety index; 破損確率; 信頼性; 強度信頼性; 最適設計; 材料設計; 一方向強化積層板; 二次多項式破損則; 面内多軸荷

Design-oriented failure criteria of composite materials are applied to construct an evaluation model of probabilistic safety based on the extended structural reliability theory. Typical failure criteria such as maximum stress, maximum strain and quadratic polynomial are compared from the viewpoint of reliability-oriented material design of composite materials. A new design diagram which shows the feasible region on in-plane strain space corresponding to the safety index or failure probability is also proposed. These stochastic failure envelope diagrams which are overlayed onto in-plane strain space enables one to evaluate the stochastic behavior of the composite laminate with any lamination orientation under multi-axial stress or strain condition. Experimental studies such as fractgraphy and acoustic emission are also performed to evaluate the complicated failure mechanism of composite materials. The sequential failure path of each layer of composite laminates is simulated by means of modulus degradation and safety indices under the offaxis load conditions. From the simulation analysis, a typical failure path is evaluated corresponding to an in-plane strain vector. The mechanical behavior, such as decreasing modulus and increasing inplane strain are also simulated in correspondence with each stage of sequential ply failure. It is necessary to select the important failure path whose occurrence probabilities are greater than others, since therc are too many failure paths of multi-layer composite laminates to evaluate. The proposed method of selecting effective failure paths depends upon the heuristic procedure based on one branch and bound rule which enables one to estimate the effective failure path whose occurrence probabilities are greater. An extended study is preformed in order to calculate the failure probabilty of multiple layer laminates resulting from the effective failure path.

应用面向设计的复合材料失效准则，建立了基于扩展结构可靠性理论的概率安全评估模型。从复合材料可靠性设计的角度出发，比较了最大应力、最大应变和二次多项式等典型失效准则。文中还提出了一种新的设计图，即平面应变空间上对应于安全指标或失效概率的可行域。这些叠加在面内应变空间上的随机破坏包络图使人们能够评估任意铺层方向的复合材料层合板在多轴应力或应变条件下的随机行为。对复合材料复杂的破坏机理进行了断口分析和声发射等实验研究。以弹性模量退化和安全指标为指标，模拟了各层复合材料层合板在偏轴载荷作用下的顺序破坏路径。通过仿真分析，得到了与面内应变向量对应的典型失效路径。模拟了层合板连续失效各阶段的力学行为，如弹性模数减小、面内应变增大等。由于多层复合材料层合板的失效路径太多，需要选择发生概率较大的重要失效路径进行评估。所提出的选择有效失效路径的方法依赖于基于一分枝定界规则的启发式过程，使得人们能够估计出发生概率较大的有效失效路径。为了计算由有效失效路径引起的多层层合板的失效概率，进行了扩展研究。

项目成果

Y.Miyano,M.Mohri,S.Morisugi,M.Suzuki: "Repeated Loading Rate Dependence on Flexural Fatigue Behavior of Pitch Based Carbon Fiber Unidirectional FRP Laminates" Proc.IV Comference of Asian-Pacific Congress on Strength Evaluation. 1. 276-281 (1991)

Y.Miyano,M.Mohri,S.Morisugi,M.Suzuki：“沥青基碳纤维单向 FRP 层压板弯曲疲劳行为的重复加载速率依赖性”亚太强度评估大会 Proc.IV 会议。

中易秀敏: "繊維強化複合材料積層板の確率材料設計法の研究(面内多軸荷重を受ける一方向積層板の確率破損包絡線)" 日本機械学会論文集,A編.

Hidetoshi Nakayoshi：“纤维增强复合材料层压板的随机材料设计方法研究（受到面内多轴载荷的单向层压板的概率失效包络线）”日本机械工程师学会会刊，A 卷。

H.Nakayasu,Z.Maekawa,R.Rackwitz: "Reliabilityーoriented Materials Design of Composite Materials" Proc.Int.Confーon Structural Safety and Reliability.

H.Nakayasu、Z.Maekawa、R.Rackwitz：“复合材料的面向可靠性的材料设计”Proc.Int.Conf-on 结构安全性和可靠性。

中易 秀敏,前川 善一郎: "面内多軸荷重を受ける一方向積層板のパラメ-タ・センシティビティ・スタディ" 材料. 40. 289-295 (1991)

Hidetoshi Nakayoshi、Zenichiro Maekawa：“面内多轴载荷下单向层压板的参数敏感性研究”材料。 40. 289-295 (1991)

M.Nakada,Y.Miyano,M.Suzuki,Y.Hattori: "Flexural Behavior of Carbom/Aramid Hibrid FRP Laminates" Proc.2nd Japan International SAMPE Symposium and Exhibition,Japan,December 11-14,1991. 671-678 (1991)

M.Nakada,Y.Miyano,M.Suzuki,Y.Hattori：“Carbom/Aramid Hibrid FRP Laminates 的弯曲行为”Proc.2nd Japan International SAMPE Symposium and Exhibition，日本，1991 年 12 月 11-14 日。