Study for correlations of mechanical properties in CFRP laminates to interlaminar damage by neural network

神经网络研究CFRP层合板力学性能与层间损伤的相关性

• 批准号: 05650659
• 负责人: BEN Goichi
• 金额: $ 1.41万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650659/
• 关键词: CFRP Laminates; Neural Network; Damage; Damping Capacity; Natural Frequency; Flexural Strength; Boundary Condition; Compressive Strength; 座屈設計; 逆解析; 損傷同定; 層間せん断強度

In this project, the effect of increase in damage on the static and dynamic properties in CFRP laminates and the effect of a hole, as a macroscopic damage on natural frequencies of CFRP laminated plates with a hole are discussed. In addition the identification of boundary conditions in CFRP laminated plates by neural network is also studied. The results include :1. Since the change of damage area is proportional to the change of damping capacity in the CFRP laminates, it is possible to predict the damage area by the value of damping capacity.2. There are the correlations among the flexural strength, damage area and damping capacity. The lager damping capacity becomes, the smaller flexural strength is bacome.3. In the compression, the failure mode is depend on the value of damping capacity. The failure of bucking and the pure compression failure modes are obtained in small and large damping capacity.4. The good agreement between the numerical and the expertmental results of CFRP laminated plate with a hole shows that the natural frequencies and modes can be presicted by the proposed method in this project.5. The boundary conditions of CFRP laminated plates can be identified using by the input data of natural frequencies, mode values at a few points in the Neural network proposed here.

本研究探讨了损伤增加对CFRP层合板静、动力特性的影响，以及作为宏观损伤的孔洞对含孔洞CFRP层合板固有频率的影响。此外，还研究了用神经网络识别CFRP层合板的边界条件。研究结果包括：1.由于损伤面积的变化与CFRP层合板阻尼性能的变化成正比，因此可以通过阻尼性能的大小来预测损伤面积.抗弯强度、损伤面积和阻尼性能之间存在相关性。阻尼能力越大，弯曲强度越小.在压缩过程中，破坏模式取决于阻尼能力的大小。得到了小阻尼和大阻尼时的屈曲破坏和纯压缩破坏模式.对开孔CFRP层合板的计算结果与试验结果吻合较好，表明本文方法可以预测开孔CFRP层合板的固有频率和振型.本文提出的神经网络可以用几点的固有频率、振型值作为输入数据来识别CFRP层合板的边界条件。

项目成果

Aoki, Y & Ben, G: "Adaptive Design of FRP Multilayr printed wiring boards for Vibration" Reinforced Plastics. Vol.41 (To be published). (1995)

青木，Y

青木 義男: "円孔を有する先端複合材料積層板の振動特性" 日本機械学会論文集A編. 61(掲載予定). (1995)

Yoshio Aoki：“带圆孔的先进复合材料层压板的振动特性”，日本机械工程师学会会议录，A 版（1995 年）。

青木義男: "円孔を有する先端複合材料積層板の振動特性" 日本機械学会論文集A編. 61(掲載予定). (1995)

Yoshio Aoki：“带圆孔的先进复合材料层压板的振动特性”，日本机械工程师学会会刊，A 版（1995 年）。

邊 吾一: "衝撃曲げ負荷を受けるCFRP積層材のダンピング特性(第2報)" 日本材料学会第23回FRPシンポジウム講演論文集. II30-II34 (1994)

Goichi Bebe：“CFRP层压板承受冲击弯曲载荷的阻尼特性（第二次报告）”第23届FRP研讨会论文集，日本材料学会II30-II34（1994年）。

邊 吾一: "衝撃負荷を受けるCFRP材の損傷減衰および強度の相関について" 日本機械学会中国四国支部第33期総会講演論文集. (1995)

Goichi Bebe：“论冲击载荷下 CFRP 材料的损伤衰减与强度之间的关系”日本机械工程学会中国四国分会第 33 届会员大会论文集（1995 年）。